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2020-21 Typhoon season (Pacific, Indian oceans)

  • 03-09-2020 9:19am
    #1
    Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    The Northwest Pacific is finally starting to come to life after an extremely inactive season so far. Three hurricanes formed in the past week as a strong MJO pulse moved into the Maritime Continent. The Indian Ocean had two systems back in late May/early June as the Indian Ocean Dipole was in a positive phase, but nothing since. The southern hemisphere has had no activity yet this season (2020-21 season started in July).

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    Typhoon Maysak hit South Korea yesterday, though it had weakened substantially from its earlier peak of 125 knots (around 85 knots at landfall). Another one is brewing to the southeast Okinawa and should hit the islands early Sunday at an intensity of around 120 knots before taking roughly the same path as Maysak for another landfall in the South Korea on Monday. Two very similar systems taking very similar paths within a week of eachother.

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Comments

  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Haishen rapidly intensified by 50 knots in 24 hours and is now a 135-knot supertyphoon located well southeast of Kadena US Air Force Base in Okinawa. It should hold this intensity for the next 36 hours before weakening as it moves northwards off the west coast of Japan and towards South Korea. But it should give a direct hit to some of the islands over the weekend.
    WDPN32 PGTW 040300
    MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
    SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 11W (HAISHEN) WARNING NR
    015//
    RMKS/
    1. FOR METEOROLOGISTS.
    2. 6 HOUR SUMMARY AND ANALYSIS.
    SUPER TYPHOON (STY) 11W (HAISHEN), LOCATED APPROXIMATELY 493
    NM SOUTHEAST OF KADENA AB, OKINAWA, HAS TRACKED NORTHWESTWARD AT
    08 KNOTS OVER THE PAST SIX HOURS. STY 11W HAS RAPIDLY INTENSIFIED
    50 KNOTS OVER THE PAST 24 HOURS FROM 85 KNOTS TO THE CURRENT
    INTENSITY OF 135 KNOTS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY
    SHOWS A 35NM ROUND EYE, WHICH SUPPORTS THE INITIAL POSITION WITH
    GOOD CONFIDENCE. A 032200Z SSMIS 91GHZ MICROWAVE IMAGE DEPICTS A
    COMPACT EYEWALL, APPROXIMATELY 100NM DIAMETER, WITH SPIRAL BANDING
    OVER THE SOUTHERN SEMICIRCLE. THE INITIAL INTENSITY IS ASSESSED AT
    135 KNOTS BASED ON DVORAK CURRENT INTENSITY ESTIMATES RANGING FROM
    6.5 (127 KNOTS) TO 7.0 (140 KNOTS). UPPER-LEVEL ANALYSIS REVEALS A
    FAVORABLE ENVIRONMENT WITH LOW VERTICAL WIND SHEAR (VWS) AND RADIAL
    OUTFLOW. ADDITIONALLY, SST VALUES (30-31C) AND HIGH OCEAN HEAT
    CONTENT VALUES ARE CONDUCIVE FOR FURTHER DEVELOPMENT. THE 03/1200Z
    500MB ANALYSIS SHOWS A DEEP MIDLATITUDE SHORTWAVE TROUGH OVER THE
    EAST CHINA SEA AND WESTERN JAPAN WITH A BROAD SUBTROPICAL RIDGE
    ENTRENCHED NORTH OF THE SYSTEM AND A WEAK EXTENSION OF THIS STR
    EXTENDING SOUTHWESTWARD TO ABOUT 25N 130E. STY 11W IS TRACKING WEST-
    NORTHWESTWARD UNDER THE STEERING INFLUENCE OF THE DEEP-LAYERED
    SUBTROPICAL RIDGE (STR) AND IS TRACKING TOWARD A COL REGION
    POSITIONED JUST SOUTH OF OKINAWA.
    3. FORECAST REASONING.
    A. THERE IS NO SIGNIFICANT CHANGE TO THE FORECAST PHILOSOPHY FROM
    THE LAST PROGNOSTIC REASONING MESSAGE.
    B. THE STR IS FORECAST TO BUILD AND REMAIN STATIONARY OVER JAPAN
    WITH THE SHORTWAVE TROUGH GRADUALLY FILLING OVER THE KOREAN
    PENINSULA. THE NUMERICAL MODEL TRACKERS ARE NOW IN CLOSER AGREEMENT
    NEAR OKINAWA WITH A SPREAD OF 70NM. THE FORECAST TRACK REMAINS
    HIGHLY CONSISTENT WITH THE PREVIOUS FORECAST AND INDICATES A NORTH-
    NORTHWESTWARD TRACK OVER AMAMI OSHIMA THEN JUST WEST OF KYUSHU AT
    TAU 72. NUMERICAL MODEL GUIDANCE HAS REMAINED STABLE AND THE 03/12Z
    ECMWF ENSEMBLE ALSO SUPPORTS THE FORECAST TRACK, HOWEVER, THE SYSTEM
    COULD TRACK CLOSER TO SASEBO / KYUSHU DUE TO UNCERTAINTY IN THE
    MODELS, WHICH ARE IN OVERALL FAIR AGREEMENT WITH A 100NM SPREAD IN
    SOLUTIONS NEAR TAU 72. STY 11W IS FORECAST TO MAINTAIN STY INTENSITY
    THROUGH TAU 36 WITH GRADUAL WEAKENING AFTER TAU 36 AS THE SYSTEM
    TRACKS POLEWARD.
    C. IN THE EXTENDED PERIOD, NUMERICAL MODEL GUIDANCE DIVERGES WITH
    INCREASING UNCERTAINTY IN THE EXACT TRACK OVER SOUTH KOREA. STY 11W
    IS FORECAST TO BEGIN EXTRA-TROPICAL TRANSITION (ETT) NEAR TAU 72 AS
    IT INTERACTS WITH THE SHORTWAVE TROUGH AND WILL ACCELERATE POLEWARD
    AND COMPLETE ETT BY TAU 96 WHEN IT GAINS FRONTAL CHARACTERISTICS
    OVER NORTH KOREA. SIGNIFICANT WEAKENING WILL OCCUR OVER THE KOREAN
    PENINSULA DUE TO INCREASING VWS AND INTERACTION WITH MOUNTAINOUS
    TERRAIN. OVERALL, THERE IS MODERATE CONFIDENCE IN THE JTWC FORECAST
    TRACK, WHICH IS POSITIONED CLOSE TO THE MULTI-MODEL CONSENSUS.//
    NNNN

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Haishen is still 135 knots and looks like passing about 30 miles to the west of Minami Daito Jima tomorrow afternoon, which would bring the worst conditions of its eastern flank right over the island. The local airport is ROMD, if you want to check Metars.
    WDPN32 PGTW 041500
    MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
    SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 11W (HAISHEN) WARNING NR
    017//
    RMKS/
    1. FOR METEOROLOGISTS.
    2. 6 HOUR SUMMARY AND ANALYSIS.
    SUPER TYPHOON (STY) 11W (HAISHEN), LOCATED APPROXIMATELY 385 NM
    SOUTHEAST OF KADENA AB, OKINAWA, HAS TRACKED NORTHWESTWARD AT 09 KNOTS
    (KTS) OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE
    IMAGERY REVEALS A 29 NM DIAMETER ROUND EYE, PLACING GOOD CONFIDENCE IN
    THE INITIAL POSITION. A 041238Z MHS 89 GHZ MICROWAVE IMAGE DEPICTS A
    MICROWAVE EYE FEATURE WITH A COMPACT EYEWALL (75 NM IN DIAMETER) AND
    BANDING OVER THE SOUTHERN AND EASTERN SEMICIRCLES. THE PROBABILITY OF
    AN IMMINENT EYEWALL REPLACEMENT CYCLE HAS DECREASED IN THE CIMSS M-
    PERC PRODUCT. THE INITIAL INTENSITY REMAINS AT 135 KTS BASED ON MULTI-
    AGENCY DVORAK CURRENT INTENSITY ESTIMATES RANGING FROM T6.5 (127 KTS)
    TO T7.0 (140 KTS) AND A 041236Z SATCON ESTIMATE OF 132 KTS WITH GOOD
    CONFIDENCE. STY 11W IS TRANSITING THROUGH AN OVERALL FAVORABLE
    ENVIRONMENT CHARACTERIZED BY LOW VERTICAL WIND SHEAR (VWS), RADIAL
    OUTFLOW, AND WARM (30-31 CELSIUS) SEA SURFACE TEMPERATURES (SST). THE
    04/0000Z 500MB ANALYSIS SHOWS A DEEP MIDLATITUDE SHORTWAVE TROUGH OVER
    THE EAST CHINA SEA AND WESTERN JAPAN WITH A BROAD SUBTROPICAL RIDGE
    (STR) ENTRENCHED NORTH OF THE SYSTEM WITH A WEAK STR EXTENSION
    EXTENDING SOUTHWESTWARD. STY 11W IS TRACKING WEST-NORTHWESTWARD UNDER
    THE STEERING INFLUENCE OF THE DEEP-LAYERED STR AND IS TRACKING TOWARD
    A COL REGION POSITIONED SOUTH OF OKINAWA.
    3. FORECAST REASONING.
    A. THERE IS NO SIGNIFICANT CHANGE TO THE FORECAST PHILOSOPHY FROM
    THE LAST PROGNOSTIC REASONING MESSAGE.
    B. IN THE NEAR-TERM, THE STR IS EXPECTED TO BUILD, REMAINING
    STATIONARY OVER JAPAN AS THE SHORTWAVE TROUGH SLOWLY FILLS OVER THE
    KOREAN PENINSULA. NUMERICAL MODEL GUIDANCE REMAINS IN GOOD AGREEMENT
    NEAR OKINAWA WITH A SPREAD OF 42 NM AT TAU 36. THE CURRENT FORECAST
    TRACK IS VERY CONSISTENT WITH THE PREVIOUS FORECAST AND DEPICTS A
    NORTH-NORTHWESTWARD TRACK THROUGH TAU 48, PASSING JUST EAST OF AMAMI
    OSHIMA. AFTER TAU 48, THE SYSTEM WILL TURN POLEWARD AND IS FORECAST TO
    TRACK JUST WEST OF KYUSHU. HOWEVER, DUE TO INCREASING SPREAD IN THE
    MODELS (80 NM NEAR SASEBO), THE SYSTEM COULD SHIFT CLOSER TO SASEBO /
    KYUSHU. SIMILARLY, AS THE SYSTEM MAKES LANDFALL IN SOUTH KOREA, THE
    LARGE MODEL SPREAD LEADS TO SOME UNCERTAINTY IN THE EXACT TRACK OVER
    SOUTH KOREA. THROUGH TAU 24, STY 11W IS EXPECTED TO MAINTAIN SUPER
    TYPHOON INTENSITY. AFTERWARDS, AS THE SYSTEM TRACKS POLEWARD, IT WILL
    WEAKEN FIRST GRADUALLY AND THEN MORE RAPIDLY AS IT INTERACTS WITH THE
    MOUNTAINOUS TERRAIN OF THE KOREAN PENINSULA.
    C. IN THE EXTENDED PERIOD, NUMERICAL MODEL GUIDANCE MAINTAINS A
    SPREAD OF 125-130 NM THROUGH TAU 96, LEADING TO UNCERTAINTY IN THE
    TRACK. BY TAU 72, STY 11W IS EXPECTED TO COMMENCE EXTRATROPICAL
    TRANSITION (ETT) AS IT INTERACTS WITH THE SHORTWAVE TROUGH. THE SYSTEM
    WILL ACCELERATE POLEWARD AND SIGNIFICANTLY WEAKEN AS IT TRANSITS OVER
    THE KOREAN PENINSULA DUE TO INCREASING VWS AND TERRAIN INTERACTION.
    ETT COMPLETION IS EXPECTED BY TAU 96 AS THE SYSTEM GAINS FRONTAL
    CHARACTERISTICS AND NEARS THE JET. OVERALL, THERE IS MODERATE
    CONFIDENCE IN THE JTWC FORECAST TRACK WHICH IS PLACED NEAR THE MULTI-
    MODEL CONSENSUS.//
    NNNN

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  • Moderators, Science, Health & Environment Moderators Posts: 10,465 Mod ✭✭✭✭ Meteorite58


    And this is just from the remnants of Typhoon Maysak


    https://twitter.com/WeatherSarov1/status/1301579069058932736?s=20


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Haishen has weakened slightly to 125 kts and is approaching the island of Ninamidaitojima now, where pressure is 978 hPa and 10-minute mean wind is 81 kph. It should pass its closest point at around 12-15Z today.

    11W_050000sair.jpg


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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    It has further weakened to 115 knots as an eyewall-replacement cycle seems to be taking place. That might save the Minamidaitojima population of 2000 a bit as the storm comes within 20 km at around 14Z today. The mean windspeed at the airport had been rising through the morning as the storm approaches but it's leveled off for now. Latest pressure on the island 961.7 hPa.

    https://meteologix.com/ie/observations/1293-e-261-n/wind-average-10min/20200905-1000z.html

    525361.png


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Latest image, showing the island near the northeast eyewall.

    525362.png


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Looks like Minamidaitojima dodged a major bullet as it only barely registered hurricane-force sustained winds and may have found itself between the two concentric eyewalls. Those were hourly reports, so it could have received higher winds between reports, but it still shows that it's not always as destructive as the satellite intensity estimates would lead you to believe.

    It's making a beeline straight for the small island of Kikaigashima later tonight.

    https://twitter.com/Fergaltierney/status/1302314228355825666

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Haishen is weakening more quickly than expected as shear has increased and dry air has wrapped around and into the centre. It now looks like making landfall in South Korea at only around 55 knots, down from the 90 knots shown in earlier forecasts.

    It's currently approaching Kikai Island (small kidney-shaped lone island northwest of the centre), where pressure is falling at around 1 hPa every 8 minutes. Latest winds there northeast 44 gust 61 knots, down slightly from earlier.
    METAR RJKI 060000Z AUTO 03044G61KT 0600 -RA FG FEW008 SCT011 BKN013 //////TCU 27/27 Q0964=
    SPECI RJKI 052337Z AUTO 04046G64KT 0300 -RA FG FEW008 SCT011 BKN013 //////TCU 27/27 Q0967 RMK A2857 TCU 20KM S MOV SW P/FR=
    METAR RJKI 052300Z AUTO 05043G65KT 1200 BR SCT011 BKN013 OVC019 //////TCU 27/27 Q0971=

    525423.png


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Haishen passed almost right over but just to the east of Kikaishima overnight. Max winds reported were westerly 55 gust 80 knots, with a minimum pressure of 946 hPa. The JTWC had its intensity around 95 kts at that time but its 03Z location (green symbol) in the map below seems too far south as the wind direction at Kikaishima had already backed around to 320 by then, meaning the centre was to the northeast of the island, not southeast. The JTWC only seem to use satellite imagery for both location and intensity estimates (and in this cases used a 5-hour old microwave scan) and don't mention actual surface observations, which is odd.

    Metars
    https://www.ogimet.com/display_metars2.php?lang=en&lugar=Rjki&tipo=ALL&ord=REV&nil=SI&fmt=html&ano=2020&mes=09&day=05&hora=18&anof=2020&mesf=09&dayf=06&horaf=10&minf=59&send=send

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    The Pacific season is getting going now, with five named systems having formed in October. The strongest of these has been Molave, which is about to make landfall in eastern Vietnam after crossing central Phillipines as a Cat 1 typhoon Sunday.

    NW Pacific season stats to date, with 1981-2010 averages in brackets. It's well below average activity on all parameters. The recent activity is down to a strong pulse of the MJO stationary over the eastern Maritime continent.

    Named storms: 19 (22.4)
    Named storm days: 59.50 (114.3)
    Typhoons: 10 (14.1)
    Typhoon days: 22.25 (55.6)
    Super typhoons: 4 (7.2)
    Super-typhoon days: 6.00 (18.7)
    Total ACE: 101.0 (245.6)

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    After Molave now comes Goni, which will follow a very similar track through the central Philippines in 2-3 days. Currently 120 knots, it should reach a peak of 140 knots but weaken to a Cat 3 before hitting central Luzon. It rapidly intensified by 40 knots in 6 hours today as it was in an area low shear and very high ocean heat content of around 200 kJ/cm².

    Behind it is Tropical Depression 23W, which will become typhoon Atsani as it takes a more northwesterly direction towards Okinawa, also becoming a Cat 3 by day 5.

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Supertyphon Goni became a monster before hitting the Philippines yesterday, reaching an intensity of 170 knots, equaling that of Haiyan in 2013. It quickly weakened after landfall and is now lost most of its structure as it heads towards central Vietnam, the same area that got Molave last week.

    Here is a sequence of IR satellite images before and after landfall.

    thumb_20201031T173000ir.jpgthumb_20201031T203000ir.jpgthumb_20201031T233000ir.jpgthumb_20201101T023000ir.jpgthumb_20201101T053000ir.jpgthumb_20201101T083000ir.jpg

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    Vamco is the 23rd named storm of the NW Pacific and will take a very similar path to Goni and Molave. Max intensity should be limited to Cat 1-2.

    wp252020.20111006.gif


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    We have the first storm of the Southern hemisphere season, with Alicia forming in the southern Indian Ocean. Currently 45 knots, it will probably reach about Cat 1 but stay well away from Mauritius.

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  • Registered Users Posts: 353 ✭✭ YanSno


    ALICIA is starting to weaken quickly. After reaching the stage of Tropical Cyclone, here it is again a Strong Tropical Storm. And according to forecasts, this system will continue to weaken for the next few hours.
    FB-IMG-1605557966692.jpg


  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    TC Gani made landfall along the east coast of Somalia this afternoon. It intensified 50 knots in 6 hours overnight, reaching its maximum intensity of 100 knots before landfall.

    It's the 3rd storm in the north Indian Ocean this year, where the average at this point is 4.0. This basin has two seasons per year, one in May-June and the second now, Nov-December.

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  • Registered Users Posts: 8,200 ✭✭✭ Gaoth Laidir


    The active Atlantic period this month and now Indian Ocean has been due to a strong MJO passing eastwards from Phase 8 to now Phase 3 (eastern Indian Ocean). A second tropical cyclone (Nivar) is currently just northeast of Sri Lanka and heading westwards towards SE India, making landfall as about Cat 1 on Thursday.

    Otherwise it's very quiet around the globe.

    2020io04_ohcnfcst_202011241800.gif

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  • Registered Users Posts: 353 ✭✭ YanSno


    MODERATE TROPICAL STORM number 3 (BONGOYO)
    Maximum winds (averaged over 10 minutes) estimated at sea: 75 km / h.
    Maximum estimated gusts at sea: 100 km / h.
    Estimated pressure at the center: 994 hPa.
    Position on December 07 at 10 p.m. local: 15.4 South / 79.9 East.

    Bongoyo will is unlikely to intensify into a major cyclone.
    Screenshot-20201207-201954-Chrome.jpg
    irc-02-S-BONGOYO-1607355000.jpg


  • Registered Users Posts: 353 ✭✭ YanSno


    The Disturbed Zone, the 4th low pressure system of the 2020-2021 hurricane season, was taken over by the C.M.R.S. this afternoon (Sunday 20) ...
    It should take a trajectory oriented globally to the west under the influence of the anticyclone (marked by a blue A) which will develop south of the Mascarenes ...

    The Disturbed Zone n ° 4 was moving at 4:00 p.m. (Sunday 20th) towards the southeast at a speed of 7 km / h and was positioned around point 12.6 South / 65.5 East 1390 km northeast of the Reunion coast. .
    The pressure in its center was estimated at 1008 hPa and the average maximum wind speed over 10 minutes was around 37 km / h with sea gusts of 52 km / h ...

    The Disturbed Zone apprehended by the numerical forecast models that in recent days has intensified very very slightly with more or less active and not very organized cloud masses ...

    The two numerical forecasting models (ECMWF and GFS) which have become less bad over time, are slowly starting to tune their violins ...
    The general trend they give is a trajectory as defined above and a very very very slow intensification ...

    At this time and as the holidays are approaching, it seems that this system could eventually concern the Malagasy lands ...

    This hypothesis is a little cheeky but it is rare to see the C.M.R.S. specify at the end of his bulletin on Sunday December 20, 2020 at 4:00 p.m.:
    BECAUSE OF ITS INTENSITY, THIS WEATHER DOES NOT AT THE TIME PRESENT A THREAT FOR INHABITED LANDS WITHIN 5 DAYS BUT ITS PROXIMITY REQUIRES SPECIAL FOLLOW-UP, JUSTIFYING THE EARLY ELABORATION OF THESE BULLETINS.

    As far back as I can go, I have never seen the C.M.R.S. write that kind of thing ...
    On the other hand, they have already taken charge of systems early on when they could eventually concern inhabited land BUT without ever writing it down ...

    It therefore seems important to me that the inhabitants of the Mascarene Islands keep an even distracted eye on the evolution of this system and that our Malagasy friends living in a large area north of their island do the same with a little more interest ...
    Last hours:
    The Disturbed Zone continued its course towards the west-southwest, still supported by the high pressure which swells south of the Mascarenes ...

    The forecasts of the numerical forecasting models are more and more in phase to see this system finish its course on the east coast of Madagascar but the way to get there is very different ...
    And as a start of explanation for this difference, we can notice that their analyzes of the initial position of the system diverge somewhat ... example with ECMWF and GFS
    analyse-modele-221220-00.png
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  • Registered Users Posts: 353 ✭✭ YanSno


    Forth Cyclone of the season Danilo in the south Indian Ocean basin
    Moderate Tropical Storm DANILO: Monday January 04, 2021, 20:00

    DANILO has intensified slightly over the past 05 hours but remains a Moderate Tropical Storm.

    Moderate Tropical Storm DANILO

    ☑️Maximum winds (averaged over 10 minutes) estimated at sea: 85 km / h.
    ☑️Maximum estimated gusts at sea: 120 km / h.
    ☑️Estimated pressure at the center: 990 hPa.
    ☑️ Position on January 04 at 10 p.m. local: 15.5 South / 77.0 East.
    ☑️Distance from Mauritius: About 2090 km to the North-East
    ☑️Distance from Rodrigues: About 1500 km to the North-East
    ☑️ Travel: East-South-East, 11 km / hr.

    Forecasts:

    The system should gradually descend to the south from tomorrow. DANILO should then curve towards the west-southwest and west from Wednesday 06 January to gradually approach the Mascarenes and intensify.

    Intensity forecasts:

    The system is evolving under conditions favorable to maintaining its current intensity. Nevertheless, a temporary intensification in Severe Tropical Storm is not ruled out. Beyond this Wednesday, temporary weakening is possible before strength resumes from Thursday evening with surrounding conditions improving.

    Cyclonic Danger:

    DANILO represents a POTENTIAL cyclonic danger for Rodrigues from Thursday 07 January and for Mauritius from Friday 08 January 2021.

    Potential cyclone alert for Rodrigues from January 07. Potential cyclone alert for Mauritius from January 08. These estimates are only my opinion.

    DANILO is a system to be followed very closely for Rodrigues, Mauritius and Reunion Island because this system could represent a POTENTIAL threat.

    a70c46fe3b2a51221dfa03b83a68352a-full.jpg


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