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Atlantic Hurricane Season 2015

  • 06-05-2015 2:54pm
    #1
    Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭


    The Atlantic Hurricane Season doesn't officially start until June 1st but we might have a sub-tropical or tropical system in the next few days so might as well start the thread now.

    For what it's worth, all the pre-season forecasts are going for a below-to-well below average season due to a number of climatic factors which could inhibit cyclone development.

    Invest 90L is what is currently getting a bit of early attention.

    nRSgdtO.png
    1. Disorganized showers and thunderstorms extending over portions of
    Florida, the Bahamas, and adjacent waters are associated with an
    upper-level trough and a weak surface low located over the
    northwestern Bahamas. The aircraft reconnaissance mission scheduled
    for this afternoon has been cancelled. However, conditions are
    expected to become gradually more favorable for development over the
    next day or so while the system moves slowly northward. A
    subtropical or tropical cyclone could form by Thursday or Friday,
    and interests along the southeast coast of the United States should
    monitor the progress of this system through the weekend. The next
    Special Tropical Weather Outlook will be issued on this system by 8
    PM EDT today. For additional information, see High Seas Forecasts
    issued by the National Weather Service.

    * Formation chance through 48 hours...medium...60 percent
    * Formation chance through 5 days...medium...60 percent


«1345

Comments

  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    1. Data from an Air Force Reserve Hurricane Hunter aircraft indicate
    that the nearly stationary area of low pressure located about 210
    miles south-southeast of the South Carolina-North Carolina border
    is now producing 40-45 mph winds mainly to the north and west of the
    center. Environmental conditions are favorable for some additional
    development, and any increase in the organization of the associated
    thunderstorm activity would result in the formation of a subtropical
    cyclone. The low is expected to drift to the north or north-
    northwest over the next couple of days, and interests along the
    southeastern coast of the United States should continue to monitor
    the progress of this system. Regardless of development, heavy rain
    is expected over portions of the coastal southeastern United States
    for the next few days. For additional information, see products
    from your local National Weather Service forecast office and High
    Seas Forecasts issued by the National Weather Service. The next
    Special Tropical Weather Outlook on this system is scheduled for 8
    PM EDT.

    * Formation chance through 48 hours...high...80 percent
    * Formation chance through 5 days...high...80 percent
    .


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    The first named storm of the season, Subtropical Storm Ana is born.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    I don't really set too much store by long range hurricane season forecasts anymore. They've been unmitigated disasters for the last couple of years.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Not a major storm, just an early, interesting one. Could strengthen by about 10mph before landfall at most.

    XdyS0gP.gif


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Ana has transitioned from subtropical to tropical and intensified to 60 mph. She will be approaching colder waters before making landfall tomorrow so may not have time to get stronger than that.

    ePXP5bV.gif

    WDANIQK.gif


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Invest 91L. Models currently not showing it to get any stronger than a weak TS but intensity is always hard to forecast.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Invest 91L is now Tropical Storm Bill and will make landfall in Texas later today.

    YJtTDJM.gif


  • Registered Users, Registered Users 2 Posts: 20,595 ✭✭✭✭Rikand


    Atlantic hurricane season has always been my favourite from a weather watching perspective. Thanks for all the updates maq ;)


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Tropical Depression FOUR is born. Could be an interesting one. Tough conditions for cyclone development in the Atlantic this season but this one is probably worth keeping an eye on.
    000
    WTNT44 KNHC 181448
    TCDAT4

    TROPICAL DEPRESSION FOUR DISCUSSION NUMBER 1
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL042015
    1100 AM AST TUE AUG 18 2015

    The low pressure system that has been moving westward across the
    eastern tropical Atlantic the past few days has finally acquired
    enough organized deep convection to be classified as a tropical
    cyclone. A 1232 UTC ASCAT-B overpass indicated the system has a
    well-defined circulation, and there was also a large field of 30-kt
    and greater wind vectors in the eastern semicircle. Dvorak satellite
    intensity estimates are a consensus T2.0/30 kt from TAFB and SAB, so
    the initial intensity is set at 30 kt for this advisory. Upper-level
    outflow is good to the south and fair to the north.

    The initial motion estimate is 280/11 kt. The global and regional
    models are in good agreement on the tropical cyclone moving
    west-northwestward along the southern periphery of a deep-layer
    subtropical ridge for the next 48-72 hours, accompanied by a
    decrease in forward speed as the system approaches a weakness in
    this ridge. After that time, the ridge is expected to build back in
    as a trough to the north lifts out, forcing the cyclone to turn more
    westward and accelerate through the remainder of the forecast
    period. The official forecast track lies close to but a little
    faster than the multi-model consensus TVCN due to the much slower
    GFS model creating a slow bias in the consensus.

    The overall atmospheric and oceanic environments surrounding the
    cyclone appear conducive for slow but steady strengthening
    throughout the forecast period. The only inhibiting factor will be
    occasional brief intrusions of dry mid-level air associated with the
    Saharan Air Layer that lies just to the north of the depression.
    However, given the very low vertical wind shear of less than 5 kt,
    the convective structure is expected to steadily increase in
    organization, allowing the dry air intrusions to be mixed out. The
    official intensity forecast closely follows the intensity consensus
    model IVCN through 72 hours, and then leans closer to a blend of the
    Decay-SHIPS and LGEM models at 96 and 120 hours.

    FORECAST POSITIONS AND MAX WINDS

    INIT 18/1500Z 10.6N 36.5W 30 KT 35 MPH
    12H 19/0000Z 11.0N 37.9W 35 KT 40 MPH
    24H 19/1200Z 11.3N 39.5W 40 KT 45 MPH
    36H 20/0000Z 11.6N 40.9W 50 KT 60 MPH
    48H 20/1200Z 12.1N 41.9W 60 KT 70 MPH
    72H 21/1200Z 13.2N 44.2W 70 KT 80 MPH
    96H 22/1200Z 13.7N 47.8W 80 KT 90 MPH
    120H 23/1200Z 14.0N 52.4W 85 KT 100 MPH

    $$
    Forecaster Stewart

    6fqhLUE.gif


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Tropical Storm Danny is born.


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Danny has become the first hurricane of the 2015 Atlantic season.


  • Registered Users, Registered Users 2 Posts: 2,863 ✭✭✭kevpants


    I moved to the British Virgin Islands in March. This is my first experience with a Hurricane. I'm meant to fly to Miami on business on Monday. This is going to get interesting. Off to the supermarket for water and tinned food at lunch methinks.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    NHC now tracking three separate potential areas of interest in its five day outlook, one a subtropical disturbance with a 60% chance of development within five days, the other two being tropical waves off the African coast, so far with 30% and 20% development prospects, respectively.

    So much for El Nino's hurricane season suppression...


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    The models are very keen on killing Danny. Official forecast now calls for weakening to kick in from tomorrow as Danny starts to encounter stronger wind shear.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Danny has reached Cat 3 status, the first major hurricane since 2011. No further strengthening is forecast as Danny will be encountering strong wind shear soon.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    Danny has reached Cat 3 status, the first major hurricane since 2011. No further strengthening is forecast as Danny will be encountering strong wind shear soon.

    My question is, what determines how soon a Cape Verde type tropical system recurves? It strikes me that they almost always veer northward around the time they reach the Lesser Antilles, and yet some of the most dangerous hurricanes to impact the United States do so because they remain on a primarily Westward track until they reach the gulf of Mexico, at which point they tend to rapidly intensify over warm waters before hitting a southern US state.

    Thankfully most hurricanes over the last two or three years have recurved before they manage to reach the Gulf, meaning that the US has escaped landfalls, but what is it that determines how soon they turn northward?


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    My question is, what determines how soon a Cape Verde type tropical system recurves? It strikes me that they almost always veer northward around the time they reach the Lesser Antilles, and yet some of the most dangerous hurricanes to impact the United States do so because they remain on a primarily Westward track until they reach the gulf of Mexico, at which point they tend to rapidly intensify over warm waters before hitting a southern US state.

    Thankfully most hurricanes over the last two or three years have recurved before they manage to reach the Gulf, meaning that the US has escaped landfalls, but what is it that determines how soon they turn northward?

    If there is a persistent ridge across the Atlantic then the cyclone will continue westward towards landfall. A weakness in the ridge will allow the cyclone to recurve out to sea.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    If there is a persistent ridge across the Atlantic then the cyclone will continue westward towards landfall. A weakness in the ridge will allow the cyclone to recurve out to sea.

    Ah, this if I'm not mistaken then is one of the positive effects of El Nino for the US - the outflow from East Atlantic tropical cyclones means that upper level lows are more likely in and around the Western atlantic than highs, right?


  • Registered Users, Registered Users 2 Posts: 9,868 ✭✭✭Birdnuts


    Is it just me or has the Atlantic hurricane season in recent years been very,very quiet??


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    Jeff Masters has an interesting blog post up about a CCKW, a phenomenon I hadn't come across before, which he says is a very large scale upper air circulation currently drifting Eastwards across the Atlantic, and protecting Danny and the two emerging tropical wave which have been cited as possible future tropical systems, from El Nino's wind shear.

    http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3078
    Birdnuts wrote: »
    Is it just me or has the Atlantic hurricane season in recent years been very,very quiet??

    Since 2012, we've had two quiet years. This year looked like it would be quiet, but it's ramped up so much in the last few days (well before the actual peak of hurricane season) that I wouldn't write it off just yet.

    In 2013, the Sahara belched an absolutely humungous dust storm over the whole Atlantic just as the peak of the season was beginning. The dust choked tropical waves before they had time to develop, and because it was slow moving, it affected the Atlantic for all of August and most of September as well.



    Last year, 2014, we apparently flipped briefly to a negative AMO phase for the first time in years. So Atlantic Sea Surface Temperatures were a lot lower than normal. Also, although El Nino hadn't yet formed, the East Pacific was extremely active - I don't think I've ever noticed a category 5 hurricane in the East Pacific before, and this one happened right in the middle of peak Atlantic season - which created the same hostile conditions in the Atlantic, albeit on a much smaller scale, as El Nino has this year. This is actually the same reason there were no tropical cyclones in July of 2012 - July saw three extremely powerful hurricanes form in the East Pacific, a cat 2, a cat 3 and a cat 4.

    It's essentially to do with the Earth's rotation. Any major atmospheric events on the West coast of the US have the capacity to get blown over the continent and affect what's going on in the Atlantic. So when you see an active East Pacific, hurricane-wise, it probably means the Atlantic will be inactive for a time.


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Danny has weakened to Cat 2. Continual weakening is forecast but the islands will probably get a tropical storm warning today.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Danny boy has degenerated into a remnant low. But Erika will be forming hot on his feel tonight or tomorrow. She could well run into the same problems with high sheer that Danny faced however.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    Anyone know why that new tropical wave behind invest 98L has been downgraded by the NHC? They're now saying it's very unlikely to develop, where before it left Africa they were saying 40% chance within 5 days. What's changed since then? You'd think Danny and 98L would have made enough inroads into the dry air to minimise that as a problem...


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Tropical Storm Erika is born. Currently forecast to stay at TS strength due to increasing wind shear after 48 hours. Most recent runs of main global models don't really develop it because of this. Interesting track though.

    (Having said that, the very latest ECM blows it up to a sub-950 hurricane at 240 :P)

    vSZelDj.gif


  • Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    Tropical Storm Erika is born. Currently forecast to stay at TS strength due to increasing wind shear after 48 hours. Most recent runs of main global models don't really develop it because of this. Interesting track though.

    (Having said that, the very latest ECM blows it up to a sub-950 hurricane at 240 :P)

    Yep , here it is!

    CNQQJKsUYAAQl9X.png:large

    One to watch for sure


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Latest GFS doesn't make anything of it, total contrast to the ECM.

    Looking at the hurricane models, at the moment the majority have it approaching southeast US as a hurricane. Could well recurve out to sea before any landfall but it's far too early to say.

    Conditions could be tough for the next several days and Erika first has to survive that much before anything else happens.

    LZmE37G.jpg


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    GFS is still refusing to develop Erika, but looking at the other models including the latest ECM then it seems a hurricane into south Florida in around 5 days is a real possibility. Something we haven't seen for a while.

    2cdkieb.png


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Erika is up to 50mph. Still has a couple of days of stronger shear and islands to dodge in order to survive, but if she does survive all that then conditions should become much more favorable: low shear and very warm waters ahead. The models have been shifting around since yesterday morning and a south Florida landfall doesn't look likely now unless it stays quite weak. Northeast Florida to the Carolinas now looking more likely, but a recurve out to sea without any landfall is also very possible.
    I think it'll be at least another 24 hours before we have a good idea what will happen.


  • Registered Users, Registered Users 2 Posts: 1,528 ✭✭✭Hooter23


    Tropical Storm Erika: At Least 12 Dead, Widespread Flooding Reported in Dominica; State of Emergency Declared in Florida

    As Tropical Storm Erika inches closer to Hispaniola, Florida Gov. Rick Scott wasted no time urging residents to prepare, declaring a state of emergency for all counties Friday morning.

    Erika has already turned deadly. At least 12 people have been killed on the small island of Dominica, NBC News reported Friday morning.

    "Erika has really, really visited us with a vengeance," Claude Weeks, assistance police superintendent, told the Associated Press during a phone interview. Because many roads and bridges are impassable, crews are trying to reach isolated communities via the ocean, he added.

    Among those confirmed dead were a blind elderly man and two children in southeastern Dominica, and another man was killed in the country's capital of Roseau, the report said.


    http://www.weather.com/safety/hurricane/news/tropical-storm-erika-preparations-caribbean-florida-impacts


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Fred is born.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Fred is forecast to reach hurricane strength in the vicinity of the Cape Verde Islands. This is very rare. Only 2 storms in the records dating back to 1850 have done this. One of them being Debbie in 1961 which had significant impacts here in Ireland as many of you will know.

    Mirjonx.png


  • Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    Was only thinking myself Maq that i've never seen a TS organise so early ! Interesting stuff there!


  • Moderators, Science, Health & Environment Moderators Posts: 12,549 Mod ✭✭✭✭Meteorite58


    That's certainly one to watch Maquiladora, have to keep an eye will it take the same path as Debbie. I wonder what were the Atlantic sea temperatures like that year ( must check it out ) .

    Account of Debbie here on Met.ie

    http://www.met.ie/climate-ireland/weather-events/Sep1961_hurricane-Debbie.pdf

    https://en.wikipedia.org/wiki/Hurricane_Debbie_(1961)


  • Moderators, Science, Health & Environment Moderators Posts: 12,549 Mod ✭✭✭✭Meteorite58


    Fred predicted to be quite slow moving, more time over warm waters to grow in strength ?

    pKxVXdd.gif?1

    Intersting too with the potential of an Azores high building around Mon 5th onwards , could that keep the storm tracking more south if it reached this far.

    6yK4Vyw.png?1

    The present jet charts around the 10th-11th would give the helping hand to steer it into these shores, as always a long long way off .

    xDig73M.png?1


  • Registered Users, Registered Users 2 Posts: 2,714 ✭✭✭Darwin


    Weather.com predicting it to weaken considerably by Friday (45 mph mean wind speeds) as it reaches cooler waters on it's current westerly track. An interesting one to watch for sure!


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Fred is forecast to start weakening after a couple of days due to cooler waters and increasing wind shear. He'll probably peak as a Cat 1 hurricane within the next 36 hours or so. So no repeat of Debbie is on the cards here.

    Just for fun, the weak little 1008 low off the southwest coast here is actually the remains of Fred at 384 hours on the 12Z GFS.

    QQwWxDu.png


  • Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    Saw this chart going around on twitter...
    GEOS-5 global model (cousin of GFS) generates a solar system of typhoons in the West Pac next week.

    CN1zE1DW8AEU73m.png:large

    omgwtf.gif


  • Moderators, Science, Health & Environment Moderators Posts: 12,549 Mod ✭✭✭✭Meteorite58


    Tropical Storm Fred had decreased to a depression but forecast to strengthen again to a Tropical Storm, could be a few twists and turns yet, probably stay north of the Canairies before it weakens again, if it weakens, wonder where it will end up ?

    kL58Ly8.gif?1


    Tropical Storm FRED Forecast Discussion

    Home Public Adv Fcst Adv Discussion Wind Probs Graphics Archive

    000
    WTNT41 KNHC 051444
    TCDAT1

    TROPICAL STORM FRED DISCUSSION NUMBER 27
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL062015
    1100 AM AST SAT SEP 05 2015

    Fred has been decapitated again by strong westerly wind shear.
    However, the low-level circulation continues to be vigorous. The
    initial intensity remains at 35 kt, based on satellite estimates and
    continuity. I will not speculate any more about the convection
    redeveloping or not. The NHC forecast calls for little change in
    intensity during the next 36 hours. If resilient Fred survives the
    next day or so, there is a chance of slight re-intensification as
    indicated by the SHIPS/GFS and SHIPS/ECMWF intensity guidance.

    Fred is about to reach a break in the subtropical ridge where the
    steering currents are weaker, and is now moving toward the west-
    northwest at about 7 kt. A turn to the northwest and north should
    begin later today, and by Sunday night, Fred should recurve as it
    becomes embedded within the mid-latitude westerly flow. The NHC
    forecast follows the trend of all the models, but is closer to the
    GFS and the ECMWF solutions.


    FORECAST POSITIONS AND MAX WINDS

    INIT 05/1500Z 23.4N 41.8W 35 KT 40 MPH
    12H 06/0000Z 23.9N 42.7W 30 KT 35 MPH
    24H 06/1200Z 25.5N 43.0W 30 KT 35 MPH
    36H 07/0000Z 27.5N 41.5W 30 KT 35 MPH
    48H 07/1200Z 29.5N 40.0W 35 KT 40 MPH
    72H 08/1200Z 31.5N 37.0W 40 KT 45 MPH
    96H 09/1200Z 33.0N 34.0W 40 KT 45 MPH
    120H 10/1200Z 33.0N 32.0W 40 KT 45 MPH

    $$
    Forecaster Avila


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    TD7 will probably soon becoming Grace. Heading westward but strong sheer is forecast in the days ahead so its not looking likely that it will survive a trip over the ocean.

    gwV4Crs.gif


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    Invest 92-L currently drifting northward in the central atlantic with a 40% chance of developing into a subtropical cyclone. The GFDL model shows it potentially making a direct landfall in Ireland - anyone know how reliable this particular model is?

    at201592_model.gif


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  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Invest 92-L currently drifting northward in the central atlantic with a 40% chance of developing into a subtropical cyclone. The GFDL model shows it potentially making a direct landfall in Ireland - anyone know how reliable this particular model is?

    at201592_model.gif

    It's the HWRF which shows a track in the direction of Ireland on that graphic. But it's just showing a weak 1000mb depression at that stage.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    It's the HWRF which shows a track in the direction of Ireland on that graphic. But it's just showing a weak 1000mb depression at that stage.

    Graph's been updated since I posted it, they cycle which models they display every few hours.

    To be honest, I'm not so sure about that system developing at all anymore, apparently it's on its way to being absorbed by an extratropical cyclone unless it can fire up some thunderstorms very soon, and anything it pulls together is being sheared before it gets started right now.

    El nino, eh?


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    ...aaaaaaaaaand I'm proven wrong mere hours after that remark. :p Tropical Depression Eight is born.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    That Invest is now TD8, forecast to become Henri soon.

    For what it's worth, the Canadian model does show it's remains winding up here.

    Xn75GZI.png

    Navy model does something similar too.

    bBsDsaN.gif

    But unless we see ECM/GFS showing the same then I wouldn't put much stock in those models.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    We're up to J now. Tropical Storm JOAQUIN.

    http://www.nhc.noaa.gov/graphics_at1.shtml?5-daynl#contents

    hTgj1Mo.png


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Models are now showing JOAQUIN possibly ramping up to a major hurricane near the central Bahamas in a couple of days and then swinging up to hit the US east coast around Virginia/Maryland on Sunday. Could be a big news story in a couple of days but it's too early to say yet.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    There's a good chance you'll be hearing a lot about this storm this weekend (unless the ECM is right, it sends it out to sea).

    5Ax5Rde.gif


  • Registered Users, Registered Users 2 Posts: 33,770 ✭✭✭✭RobertKK


    Currently Joaquin is a Cat 1 hurricane.


  • Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    Have sent an email to family in NJ as they are pretty prone to flooding in the NJ countryside. AccuWeather seem to prefer the more westerly GFS solutions than the ECM atm.

    http://videowall.accuweather.com/detail/videos/trending-now/video/90586624001/joaquin-and-flooding-rains-maj

    The wind looks to be in play to bring an increasing flood threat to coastal areas.

    Lets see what the 12z comes out with.


  • Registered Users, Registered Users 2 Posts: 17,798 ✭✭✭✭hatrickpatrick


    Category 2 and rising. Forecast to hit Cat 3 by Friday.


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