Aviation weather thread

Pat Dunne

ED E wrote: »

For a pleb who can't interpret TAFs, Met have a yellow in effect until 0900 tomorrow, likely to impact departures at DUB?

I have found the AeroWeather app to be very useful for us "Plebs" in helping to decode TAF's

Gaoth Laidir

What's the highest density altitude difference you've seen/witnessed? This must be close enough; Needles Airport in far eastern San Bernardino County, California.

Altitude: 983 ft, density altitude 5500 ft.

METAR KEED 072356Z AUTO 27011G17KT 10SM BKN100 OVC120 50/M02 A2971 RMK AO2 SLP015 T05001017 10500 20439 56023=

Anyone know what's the density altitude limit for the CRJs that were temporarily grounded at Phoenix a few weeks ago due to similar temperatures?

smurfjed

CRJ has an environmental envelope of ISA+35, most others go to +39.4

Gaoth Laidir

Yes, I see the figures only go up to 118F for the CRJ but 126 and 127F for the Airbus and Boeings. At Phoenix's altitude that 118F is a big limitation.

smurfjed

Yep, our limitations are in temp not density...

Gaoth Laidir

smurfjed wrote: »

Yep, our limitations are in temp not density...

Is it purely performance-related or are there issues with other things, such as fuel temperature, avionics, etc.?

smurfjed

As most aircraft have performance data for temperatures higher than the environmental envelope, I would consider the limitation as an arbitrary figure, if you wished to give the manufacturer a load of cash, they would expand the envelope for you.
In our previous discussions with Bombardier, they realised that the CRJ700 couldn't carry the same load as the ERJ170, so they offered to re-engine the aircraft with -900 engines, based on this, I'm sure that it we complained about the environmental envelope, they would have expanded it.
My prime issue with such high temperatures is how do you keep the cabin cool.

Gaoth Laidir

The tornado at Vienna airport at 1420Z on the 10th was reported in the 1450Z METAR (as a recent funnel cloud).

METAR LOWW 101450Z 30028G47KT 240V360 0000 TSRA FEW002 SCT030CB BKN050 21/16 Q1010 REFC WS ALL RWY BECMG NSW=

Note that visibility was <50 metres.

METARS are issued there every 30 mins - at 20 and 50 past the hour - but they didn't issue on at 1420Z. Probably too busy grabbing the cameras! Strangely it wasn't reported in the 1500Z synop report.

JCX BXC

Cork looks potentially fun tomorrow evening!

PROB40 1821/1824 0200 FG +TSRA BKN001

smurfjed

It changed from PROB40 to BECMG 1823/1902 0200 FG BKN001

I dont like the use of FG in cases like this, for me FOG is something that will burn off or blow away with slight changes in temperature or wind,  if i see FG in the early morning, I expect it to burn off as the morning develops. But that isn't the case in CORK.

Gaoth Laidir

But what else can they use with visibility down to 200 metres? The airfield is in low cloud. Maybe they should bring in a LWCL or SHYT descriptor :-)

Simon Gruber Says

RMK: CNT SEE FCK ALL

JCX BXC

One I've personally never seen before.

EGJB 181350Z 09020KT 9000 -TSRA SQ BKN070CB 19/18 Q1010 RERA

Seems SQ means "squalls".

Irish Steve

Simon Gruber Says wrote: »

RMK: CNT SEE FCK ALL

Reminds me of a classic phrase that used to be used on a regular basis at Bristol when they reported current weather, "Be advised there is cloud below the airfield level", which came about as the airport is on top of a hill, and tower could see the valley below, and with prevailing winds, there would often be scud cloud running up the valley, well below the airport. The hills used to provide some lifting, so the tower wasn't in the cloud, some of the time. It was nothing unusual for conditions to go from better than CAT 1 to worse than CAT III during the time it took to get from the final approach fix to the decision point, which resulted in a lot of diversions on a regular basis.

Eventually, they spent massive money on diverting the road that ran past the end of the runway, and installed CATIII ILS upgrades, which made a significant difference to the number of diversions that happened.

faoiarvok

Irish Steve wrote: »

"Be advised there is cloud below the airfield level"

OVCM001

Oscar Bravo

DL206 airborne from Shannon just now reporting moderate icing. looking to deviate around some cells.

Lustrum

Heard of a MOTNE for the first time ever yesterday, there was no RVRs, cloud heights or wind available in TLS so captain thought it was a MOTNE that was given in the METAR

http://www.hilmerby.com/fom/proc_motne.html

Anyone ever come across them before?

Gaoth Laidir

Lustrum wrote: »

Heard of a MOTNE for the first time ever yesterday, there was no RVRs, cloud heights or wind available in TLS so captain thought it was a MOTNE that was given in the METAR

http://www.hilmerby.com/fom/proc_motne.html

Anyone ever come across them before?

Yes, they're common in winter time, especially in eastern Europe, but Waterford's metars usually contain it all year round when the runway is damp or wet. I have never heard of them called MOTNE though

JCX BXC

LEMD 281300Z 28012KT 0500 R32L/1200D +TSGRRA BKN018CB BKN040 17/16 Q1017 R88/29//95 BECMG NSW

Pity we never see these sort of METARs in Ireland!

martinsvi

JCX BXC wrote: »

LEMD 281300Z 28012KT 0500 R32L/1200D +TSGRRA BKN018CB BKN040 17/16 Q1017 R88/29//95 BECMG NSW

Pity we never see these sort of METARs in Ireland!

really? You're feeling confident about the lightning protection around your house?

JCX BXC

martinsvi wrote: »

really? You're feeling confident about the lightning protection around your house?

Got a direct strike last February, seemed to do okay!

We are in now way prepared for this weather, and it would likely cause havoc, but they seem to deal with it fine in Spain and coming from someone with a nice interest in weather, would be very cool to see.

martinsvi

JCX BXC wrote: »

Got a direct strike last February, seemed to do okay!

We are in now way prepared for this weather, and it would likely cause havoc, but they seem to deal with it fine in Spain and coming from someone with a nice interest in weather, would be very cool to see.

grand stuff, I'm not that confident about my setup thou, seen some close hits abroad with lightning hitting the rods, when you see that sea of sparks up close, it can be quite scary... there's nothing on my house to protect it from a direct hit

Irish Steve

Late 90's a house about 4 doors away from us took a direct hit on the chimney, and it blew a number of sockets off the wall there, among other things, as well as damaging devices that were plugged in at the time.

We had a TV, a Fax device and a phone switchboard blown by the surges that came in on the Cable TV network, and the phone lines, total damage came to close on €3k, which was serious money at that time, but there was no way to repair the devices that were fried, sue to the nature of the damage.

From an aviation point of view, severe weather of this nature can be a problem, both in terms of potential damage to airframes, and the delays and diversions that can result, which can be a significant cost to the airlines affected.

Having said that, watching a severe Florida (sub tropical) style storm can be impressive, as long as it's not directly overhead, especially at night, and they don't do damage that often, as the structures at risk in that part of the world are well protected. A severe storm here in Ireland however is a very different matter, the protections and infrastructure are just not geared to deal with the consequences, as was seen recently in Donegal.

smurfjed

Juliana Airport, Saint Maaten
FM060900 34075G95KT
FM061100 300120G140KT
FM061500 25060G80KT
FM061900 18035G50KT
Not nice.

smurfjed

https://earth.nullschool.net/#current/wind/surface/level/orthographic=-69.00,19.15,1432
Interesting to watch

JCX BXC

smurfjed wrote: »

Juliana Airport, Saint Maaten
FM060900 34075G95KT
FM061100 300120G140KT
FM061500 25060G80KT
FM061900 18035G50KT
Not nice.

Ouch.

Would not like to ever encounter a 140KT wind.

faoiarvok

Thermometer/hygrometer broken at Cork?

EICK 161200Z 22028G53KT 2000 RA BKN005 BKN009 ///// Q0983

JCX BXC

Waterford gusting 74kts at 2pm.

Gaoth Laidir

Eurocontrol's daily weather assessment, including comment on Ophelia.

https://www.public.nm.eurocontrol.int/PUBPORTAL/gateway/spec/PORTAL.21.0.0.4.34/_res/1508155378455_1610_1230.pdf

Gaoth Laidir

For posterity, here are today's Ophelia METARs from the south coast.

Cork
METAR EICK 161600Z 23031G49KT 9999 -RA BKN011 BKN014 12/11 Q0995 NOSIG
METAR EICK 161530Z 23032G48KT 9999 SCT011 BKN016 12/12 Q0993 TEMPO 24030G45KT
METAR EICK 161500Z 22024G37KT 9999 BKN011 BKN017 13/13 Q0992 TEMPO 24030G45KT
METAR EICK 161430Z 23027G42KT 9999 SCT006 BKN012 BKN018 ///// Q0991
METAR EICK 161330Z 22035G47KT 9999 SCT010 BKN018 ///// Q0988
METAR EICK 161300Z 21034G49KT 9000 SCT006 BKN016 ///// Q0986
METAR EICK 161230Z 21037G52KT 2500 -RA BKN005 BKN010 ///// Q0984
METAR EICK 161200Z 22028G53KT 2000 RA BKN005 BKN009 ///// Q0983
METAR EICK 161130Z 17038G60KT 3000 RA BKN005 BKN010 11/11 Q0981 TEMPO 18050G70KT
METAR EICK 161100Z 16043KT 3000 -RA BKN005 BKN010 10/10 Q0981 TEMPO 18050G70KT
METAR EICK 161030Z 16043G60KT 4000 -RA BKN009 BKN014 11/10 Q0984 TEMPO 18050G70KT
METAR EICK 161000Z 16041G63KT 7000 -RA SCT014 BKN021 12/10 Q0986 TEMPO 18050G70KT BKN010
METAR EICK 160930Z 16038G67KT 9000 -RA SCT014 BKN021 12/10 Q0989 TEMPO 18050G70KT BKN010
METAR EICK 160900Z 16031G50KT 8000 -RA BKN012 BKN023 12/11 Q0990 TEMPO 18050G70KT BKN010
METAR EICK 160830Z 16031G57KT 8000 FEW012 BKN022 13/11 Q0991 BECMG 9999
METAR EICK 160800Z 16033G55KT 6000 -RA SCT012 BKN021 13/12 Q0991 BECMG 9999
METAR EICK 160730Z 16036G53KT 9999 FEW012 BKN021 14/12 Q0992 NOSIG
METAR EICK 160700Z 17029G47KT 9999 SCT012 BKN018 15/14 Q0993 NOSIG
METAR EICK 160630Z 14031G45KT 9999 FEW006 BKN020 BKN070 16/15 Q0993 NOSIG
METAR EICK 160600Z 12023KT 9999 FEW006 SCT026 BKN070 15/14 Q0995 NOSIG

Waterford
METAR EIWF 161530Z 22041G57KT 3000 RA SCT008 BKN016 12/12 Q0994 REDZ R21/1/////
METAR EIWF 161500Z 22044G57KT 4000 DZ SCT008 BKN020 13/12 Q0994 R21/1/////
METAR EIWF 161430Z 21046G66KT 3000 -DZ SCT012 BKN018 13/12 Q0993 REDZ R21/1/////
METAR EIWF 161330Z 10052G71KT 3000 DZ SCT003 BKN018 13/11 Q0991 RERA R21/1/////
METAR EIWF 161300Z 10049G74KT 4000 RA SCT003 BKN018 12/11 Q0992 REDZ R21/1/////
METAR EIWF 161230Z 16046G66KT 4000 DZ SCT008 BKN018 12/11 Q0993 R21/1/////
METAR EIWF 161200Z 19045G66KT 4000 VCSH SCT008 BKN012 13/10 Q0993
METAR EIWF 161130Z 19043G61KT 150V210 6000 VCSH SCT009 BKN020 14/10 Q0995
METAR EIWF 161100Z 18033G50KT 6000 VCSH SCT007 BKN022 14/10 Q0995
METAR EIWF 161030Z 18031G51KT 7000 VCSH BKN022 14/11 Q0996
METAR EIWF 161000Z 19034G50KT 8000 VCSHRA SCT022 14/11 Q0997
METAR EIWF 160930Z 19033G47KT 160V220 8000 FEW018 SCT030 15/11 Q0998 R21/0/////
METAR EIWF 160900Z 19033G46KT 160V220 9000 FEW019 SCT029 15/12 Q0998 R21/1/////
METAR EIWF 160800Z 19033G53KT 9999 SCT022 16/13 Q0999 R21/1/////
METAR EIWF 160730Z 17021G33KT 9999 SCT023 BKN028 17/14 Q0999 R21/1/////