Akash and Gonu thread

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Chacor
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#341 Postby Chacor » Tue Jun 05, 2007 10:37 am

WindRunner wrote:
Chacor wrote:
Janie2006 wrote:According to the Islamic Republic News Agency's weather page, there is nothing especially unusual to report:

- Persian Gulf and Oman Sea coastal provinces of Khuzestan, Bushehr, Hormuzgan and Sistan-Baluchestan as well as islands of Abu Mousa, Greater and Lesser Tunbs, Qeshm, and Lavan: Slightly to partly cloudy, on afternoon with increasing clouds, in some areas with wind or shower and thunder


Surely they are aware of Gonu?


To be fair to them the IMD track takes it nowhere near Iran, and the JTWC track shows 34-kts reaching the coast only around 12Z tomorrow.


I thought that was just the IMD model, because I didn't think they made an official forecast track?


The image says "track prediction by IMD model", which is rather vague. But based on the IMD's public advisories it would seem that that's their forecast, for it to landfall in Oman and not Iran.
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#342 Postby Chacor » Tue Jun 05, 2007 10:38 am

wxman57 wrote:Core appears to be collapsing quite rapidly. Eye no longer visible. T-numbers suggest Cat 1 now.

http://cimss.ssec.wisc.edu/tropic/adt/odt02A.html


This was a great and beautiful storm at its peak but it needs to weaken very quickly now, and I hope that it does.
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#343 Postby Cyclenall » Tue Jun 05, 2007 11:10 am

This is the first hour I have actually seen the dry air do something to Gonu.
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#344 Postby mempho » Tue Jun 05, 2007 12:31 pm

Chacor wrote:
wxman57 wrote:Core appears to be collapsing quite rapidly. Eye no longer visible. T-numbers suggest Cat 1 now.

http://cimss.ssec.wisc.edu/tropic/adt/odt02A.html


This was a great and beautiful storm at its peak but it needs to weaken very quickly now, and I hope that it does.


There still could be a lag before the major surge threat dies down. This is no Katrina (as far as fetch over water), but there still could be some lag...so not out of the woods by any means yet.
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#345 Postby P.K. » Tue Jun 05, 2007 12:31 pm

Chacor wrote:
The image says "track prediction by IMD model", which is rather vague. But based on the IMD's public advisories it would seem that that's their forecast, for it to landfall in Oman and not Iran.


I think it is just the graphical version of this forecast.

WTIN20 DEMS 050600
TROPICAL CYCLONE WARNING
RSMC NEW DELHI F/C
1. TROPICAL CYCLONE -GONU- WARNING NR 03
ACTIVE TROPICAL CYCLONE IN ARABIAN SEA

INITIAL POSITION
050000Z NEAR 20.7 N 62.8 E
ESTIMATED MAXIMUM SUSTAINED WIND 120 KTS

MOVEMENT PAST SIX HOURS 045DEG AT 12 KTS

FORECAST
06 HRS VALID AT: 050600 21.4N 61.6E
ESTIMATED MAXIMUM SUSTAINED WIND 115 KTS

12 HRS VALID AT: 051200 21.8N 60.5E
ESTIMATED MAXIMUM SUSTAINED WIND 110 KTS

18 HRS VALID AT: 051800 22.1N 59.7E
ESTIMATED MAXIMUM SUSTAINED WIND 105 KTS

24 HRS VALID AT: 060000 22.1N 59.3E
ESTIMATED MAXIMUM SUSTAINED WIND 100 KTS

30 HRS VALID AT: 060600 22.5N 58.5E
ESTIMATED MAXIMUM SUSTAINED WIND 100 KTS

36 HRS VALID AT: 061200 22.9N 58.1E
ESTIMATED MAXIMUM SUSTAINED WIND 90 KTS

42 HRS VALID AT: 061800 23.6N 58.1E
ESTIMATED MAXIMUM SUSTAINED WIND 75 KTS

48 HRS VALID AT: 070000 24.3N 57.7E
ESTIMATED MAXIMUM SUSTAINED WIND 50 KTS

NEXT WARNING AT 060600
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#346 Postby wxman57 » Tue Jun 05, 2007 12:39 pm

mempho wrote:
There still could be a lag before the major surge threat dies down. This is no Katrina (as far as fetch over water), but there still could be some lag...so not out of the woods by any means yet.


Storm surge is more a function of the size of a TC's wind field rather than the peak intensity. Katring produced a large storm surge because it had hurricane-force winds extending out to 100 miles east of the center at landfall, not because it had been a Cat 5 the day before. So whether or not Gonu produces any significant storm surge depends more on how its wind field is (or will be) changing as it approaches the coast of Iran in another 24 hours or so. Passing east of Oman, it won't produce a significant surge there. Maybe tides a few feet above normal due to large waves moving ashore.
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Dubai Palm Islands erosion?

#347 Postby Toadstool » Tue Jun 05, 2007 12:52 pm

Something this big could really damage those man-made palm islands Dubai made as well as the World Island it's still constructing.
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#348 Postby P.K. » Tue Jun 05, 2007 1:25 pm

Question: Has anyone here ever had a reply to an e-mail from RSMC New Delhi? After the system has dissipated I'm going to enquire about the BT file again but need an address they will actually reply to.
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DrewFL

#349 Postby DrewFL » Tue Jun 05, 2007 2:17 pm

Here is a link to news and information from Oman and the UAE.Oman
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#350 Postby HurricaneRobert » Tue Jun 05, 2007 2:30 pm

Gonu's a public holiday?
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#351 Postby windstorm99 » Tue Jun 05, 2007 2:37 pm

landfall on the NE coast of oman with winds of about 90-100mph seems like a got bet with Gonu.Extensive damage along with flooding is likely to me.Iran is next in line.

IR Loop from CIMSS

Also here a new image of Gonu from the terra sateliite.
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#352 Postby Coredesat » Tue Jun 05, 2007 3:11 pm

HurricaneRobert wrote:Gonu's a public holiday?


They probably declared a public holiday so people could prepare for the storm.
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#353 Postby HURAKAN » Tue Jun 05, 2007 3:17 pm

Image

Good times are always short!!!
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#354 Postby HurricaneRobert » Tue Jun 05, 2007 3:33 pm

Nevermind. I didn't look at the date.
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#355 Postby DrewFL » Tue Jun 05, 2007 4:01 pm

I didn't notice that either.


CI# /Pressure/ Vmax
4.9 / 956.4mb/ 87.4kt


6hr-Avg T# 3hr-Avg T# Adj T# Raw T#
4.4 4.4 4.3 4.0

Latitude bias adjustment to MSLP : +0.0mb

Center Temp : -69.7C Cloud Region Temp : -64.7C

Scene Type : UNIFORM CDO CLOUD REGION

Positioning Method : SPIRAL ANALYSIS

Ocean Basin : INDIAN
Dvorak CI > MSLP Conversion Used : PACIFIC

Tno/CI Rules : Constraint Limits : 0.7T/6hr
Weakening Flag : ON
Rapid Dissipation Flag : ON
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#356 Postby Coredesat » Tue Jun 05, 2007 7:26 pm

Really struggling against the dry air now:

Image
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#357 Postby HurricaneBill » Tue Jun 05, 2007 8:38 pm

In case anybody was wondering, Iran's Department of Meteorology did issue storm warnings for the southeast coast.
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#358 Postby Chacor » Tue Jun 05, 2007 9:26 pm

Not sure where IMD have their centre of Gonu...
TROPICAL STORM “GONU” ADVISORY NO. TWENTY-NINE ISSUED AT 0000 UTC OF 6TH JUNE, 2007 BASED ON 2100 UTC CHARTS OF 5TH JUNE 2007. THE VERY SEVERE CYCLONIC STORM “GONU” MOVED SLIGHTLY WESTNORTHWESTWARDS AND CROSSING THE COAST OF OMAN NEAR LAT. 22.50NORTH.

CURRENT INTENSITY IS T4.5 RPT T4.5. SATELLITE IMAGERIES SHOW CDO PATTERN. ESTIMATED CENTRAL PRESSURE 970 HPA. MAXIMUM SURFACE SUSTAINED WIND SPEED 80 KTS GUSTING 90 KTS.

FORECAST: THE SYSTEM IS LIKELY TO WEAKEN FURTHER AND MOVE IN A WEST-NORTHWESTERLY DIRECTION. 24 HOURS FORECAST INTENSITY IS T2.5 RPT T2.5. SEA CONDITION WILL BE HIGH.
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#359 Postby Chacor » Tue Jun 05, 2007 9:36 pm

Gonu held at 80 kts with an interesting new track from the JTWC. Landfall as a minimal 35-kt dissipating cyclone far further inland. However based on this track Dubai could experience some 34-kt winds.

REMARKS:
060300Z POSITION NEAR 22.8N 59.7E.
TROPICAL CYCLONE (TC) 02A (GONU) LOCATED APPROXIMATELY 100 NM
SOUTHEAST OF MUSCAT, OMAN, HAS TRACKED NORTHWESTWARD AT 08 KNOTS
OVER THE PAST 06 HOURS. CURRENT INTENSITY IS BASED ON DVORAK
ESTIMATES RANGING FROM 75 TO 90 KNOTS WITH A 55-KNOT DECREASE
IN INTENSITY OVER THE PAST 24 HOURS. ANIMATED SATELLITE IMAGERY
AND A 052149Z AMSR-E IMAGE SHOW A SLIGHT IMPROVEMENT IN OVERALL
ORGANIZATION OVER THE PAST 06 HOURS BUT A CONTINUED EROSION OF
DEEP CONVECTION OVER THE EASTERN SEMI-CIRCLE. HOWEVER, THE 36V
GHZ IMAGE INDICATES THAT THE SYSTEM STILL HAS A WELL-DEVELOPED
LOW-LEVEL STRUCTURE WITH A WEAK MICROWAVE EYE. THIS IMAGE
SUPPORTS THE INITIAL STORM POSITION AND MOTION. THERE IS VERY
LITTLE CHANGE IN THE TRACK PHILOSOPHY FROM THE PREVIOUS FORE-
CAST. TC 02A IS FORECAST TO CONTINUE ITS RAPID WEAKENING TREND
DUE TO DRY AIR ENTRAINMENT, LAND INTERACTION, AND A SHARP
DECREASE IN OCEAN HEAT CONTENT. TC 02A CONTINUES TO TRACK ALONG
THE SOUTHWEST PERIPHERY OF THE MID-LEVEL SUBTROPICAL RIDGE AND
IS FORECAST TO TRACK NORTHWESTWARD THROUGH TAU 36. AFTER TAU
36, THE TRACK IS FORECAST TO BECOME MORE NORTH-NORTHWESTWARD
AS THE SYSTEM MOVES INTO A WEAKNESS IN THE STEERING RIDGE
ENHANCED BY AN APPROACHING SHORTWAVE TROUGH. THERE IS INCREASED
UNCERTAINTY IN TRACK AFTER TAU 24 SINCE STEERING WILL SHIFT
TO A LOWER LEVEL AS THE TC WEAKENS UNDER 60 KNOTS AND THIS
LOW-LEVEL STEERING COULD PRODUCE A MORE WESTWARD TRACK TOWARD
ASH SHARIQAH. IT IS IMPORTANT TO NOTE THAT TC 02A WILL BECOME
A VERY WEAK TC WITH 30-40 KNOT INTENSITY AFTER TAU 48 DUE TO
EXTREMELY DRY AIR. THEREFORE, REGARDLESS OF THE 48-72 HOUR
TRACK, THE SYSTEM WILL NOT BE A SIGNIFICANT TC. THE AVAILABLE
DYNAMIC AIDS HAVE STABILIZED AND ARE IN GOOD AGREEMENT WITH THE
NORTHWESTWARD TRACK AND RAPID WEAKENING TREND. THIS FORECAST IS
BASED ON A CONSENSUS OF THE AIDS THROUGH THE PERIOD. MAXIMUM
SIGNIFICANT WAVE HEIGHT AT 060000Z IS 30 FEET. NEXT WARNINGS
AT 060900Z, 061500Z AND 062100Z.//

Image
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DrewFL

#360 Postby DrewFL » Tue Jun 05, 2007 9:36 pm

Gonu has been dropping off fairly rapidly:

CI# /Pressure/ Vmax
4.3 / 970.0mb/ 72.2kt
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