BoB: Very Severe Cyclonic Storm SIDR

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#201 Postby Squarethecircle » Tue Nov 13, 2007 12:17 pm

Derek Ortt wrote:even if this weakens to 85-100KT (which may be the final landfall intensity), that would still devastate Bangladesh. remember, the 1970 cyclone was the equivalent of a marginal 3 (and Texas and western Louisiana know how bad a marginal 3 is... just look back at Rita)

Actually, some estimates place it as high as 110 knots, however, the point is valid. Any slowing down or significant intensification of this system will cause enormous damage to Bangladesh. An interesting coincidence; today is the date of landfall for stated system, and the track, while heading straight north its entire life, was not to dissimilar from the track so far and the forecast track. Most likely the toll will be sizable, but a repeat of that event is unlikely; it hit in a very, very susceptible spot. While the eye is more ragged, the convection is flaring again, encircling the storm, and the eye seems to be in the perfect place to reform. When was the last time (if ever) in recorded history that a season was potentially as active as this one, at least in terms of number of depressions and strong storms?
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#202 Postby HURAKAN » Tue Nov 13, 2007 12:29 pm

Image

Image

The small eye is back!
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Derek Ortt

#203 Postby Derek Ortt » Tue Nov 13, 2007 12:33 pm

http://www.nrlmry.navy.mil/tc-bin/tc_ho ... &SIZE=full

based upon the satellite imagery, I would now estimate this as a T 7.0, making TC9B (not a typo as I include depressions) equivalent to a category 5 hurricane
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#204 Postby HURAKAN » Tue Nov 13, 2007 12:34 pm

UW - CIMSS
ADVANCED DVORAK TECHNIQUE
ADT-Version 7.2.1
Tropical Cyclone Intensity Algorithm

----- Current Analysis -----
Date : 13 NOV 2007 Time : 170000 UTC
Lat : 13:38:46 N Lon : 89:41:12 E

CI# /Pressure/ Vmax
6.6 / 910.8mb/129.6kt


6hr-Avg T# 3hr-Avg T# Adj T# Raw T#
6.5 6.6 6.7 6.7

Latitude bias adjustment to MSLP : +0.0mb

Estimated radius of max. wind based on IR :N/A km

Center Temp : -31.8C Cloud Region Temp : -79.0C

Scene Type : EYE

Positioning Method : SPIRAL ANALYSIS

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

Tno/CI Rules : Constraint Limits : NO LIMIT
Weakening Flag : OFF
Rapid Dissipation Flag : OFF

****************************************************
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#205 Postby Squarethecircle » Tue Nov 13, 2007 12:35 pm

But wait! Is that a secondary eye I see in the top image? Could it be going through a very noticeable EWRC? Regardless, it should intensify sooner or later, and even if it goes through a weakening trend, it should not drop too much below 100 knots max.

Wow Derek! If you're right, we're in for a hell of a ride, here!

Holy crud! Could I at least post here? And that is rather scary...
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#206 Postby HenkL » Tue Nov 13, 2007 1:03 pm

TROPICAL CYCLONE ADVISORY
RSMC-TROPICAL CYCLONES, NEW DELHI


TROPICAL STORM “SIDR” ADVISORY NO. THIRTEEN ISSUED AT 1730 UTC OF 13TH NOVEMBER, 2007. THE VERY SEVERE CYCLONIC STORM “SIDR” OVER SOUTHEAST AND ADJOINING CENTRAL BAY OF BENGAL REMAINED PRACTICALLY STATIONARY AND LAY CENTRED AT 1500 UTC OF 13TH NOVEMBER 2007 OVER SOUTHEAST AND ADJOINING CENTRAL BAY OF BENGAL NEAR LAT. 13.00 N AND LONG 89.50 E, ABOUT 380 KM WEST-NORTHWEST OF PORT BLAIR (43333 ).

ESTIMATED CENTRAL PRESSURE: 964hPa.

THE SATELLITE IMAGERIES SHOW SOLID INTENSE TO VERY INTENSE CONVECTIVE CLOUDS AROUND THE SYSTEM CENTRE.

CURRENT INTENSITY: T5.0 RPT T5.0.

MAXIMUM SUSTAINED SURFACE WIND SPEED IS 90-100 KTS AROUND THE STORM CENTRE.

SEA: PHENOMENAL.

FORECAST: THE STORM IS LIKELY TO MOVE IN A NORTH-NORTHWESTERLY DIRECTION AT ABOUT 05 KT.

INTENSITY T6.0 RPT T6.0 WITH WINDS OF 115 KTS GUSTING TO 130 KTS NEAR THE CENTRE OF THE STORM AT 1500 UTC OF 14TH NOVEMBER 2007.
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Re: 06B - Sidr models thread

#207 Postby hcane27 » Tue Nov 13, 2007 1:12 pm

Image
updated to include QLM model output
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#208 Postby HURAKAN » Tue Nov 13, 2007 1:20 pm

Image
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#209 Postby Derek Ortt » Tue Nov 13, 2007 1:23 pm

that secondary eyewall was from 0730 this morning. It likely has finished and is why we are seeing the intensification

http://www.nrlmry.navy.mil/tc_pages/tc0 ... atest.html

we may see one more EWRC, but after that, the rainband pattern may not be as conducive for further EWRCs
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#210 Postby Derek Ortt » Tue Nov 13, 2007 1:26 pm

12Z model NCEP is out to lunch it seems. They are turning this nearly due west. Waiting for the EURO and UKMET to come in
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#211 Postby Crostorm » Tue Nov 13, 2007 1:35 pm

Image
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#212 Postby wxman57 » Tue Nov 13, 2007 1:37 pm

Remember, size of the wind field is much more significant than peak wind speed with respect to potential storm surge generation. So it could make landfall as a weaker storm than the one in 1970 but produce a larger storm surge if its wind field is significantly larger (like Katrina as a Cat 3 producing a larger surge than Camille as a Cat 5).
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Derek Ortt

#213 Postby Derek Ortt » Tue Nov 13, 2007 1:41 pm

http://en.wikipedia.org/wiki/Image:Nove ... yclone.jpg

here is a sat image near landfall of the 1970 cyclone. The current cyclone may be a little larger than the 1970 cyclone

http://en.wikipedia.org/wiki/Image:1991 ... _0623Z.jpg

The current cyclone may be similar in size and intensity to the one that devastated the country in 1991
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#214 Postby P.K. » Tue Nov 13, 2007 2:17 pm

Can someone update the thread title to Sidr's actual name?

Latest forecast track map attached:

Image
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#215 Postby CrazyC83 » Tue Nov 13, 2007 3:07 pm

How is Sidr pronounced?

Anyway, I think this has strengthened today and my guess is that it is a solid Cat 4 now (winds 125 kt, pressure about 923mb).
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Re: 06B - Sidr models thread

#216 Postby hcane27 » Tue Nov 13, 2007 3:13 pm

Image
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Re: NIO: Bay of Bengal: : Tropical Cyclone SIDR 0709

#217 Postby wxman57 » Tue Nov 13, 2007 3:14 pm

18Z advisory still has an estimated 115kts, though it does look better than it did at 09Z in terms of outflow and general appearance:

SUBJ: TROPICAL CYCLONE 06B (SIDR) WARNING NR 006
WTIO31 PGTW 132100
1. TROPICAL CYCLONE 06B (SIDR) WARNING NR 006
01 ACTIVE TROPICAL CYCLONE IN NORTHIO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
---
WARNING POSITION:
131800Z --- NEAR 13.7N 89.5E
MOVEMENT PAST SIX HOURS - 350 DEGREES AT 07 KTS
POSITION ACCURATE TO WITHIN 025 NM
POSITION BASED ON EYE FIXED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 050 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT
065 NM SOUTHEAST QUADRANT
065 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 125 NM NORTHEAST QUADRANT
125 NM SOUTHEAST QUADRANT
105 NM SOUTHWEST QUADRANT
120 NM NORTHWEST QUADRANT
REPEAT POSIT: 13.7N 89.5E
---
FORECASTS:
12 HRS, VALID AT:
140600Z --- 15.0N 89.2E
MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 045 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT
065 NM SOUTHEAST QUADRANT
065 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT
125 NM SOUTHEAST QUADRANT
110 NM SOUTHWEST QUADRANT
125 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 345 DEG/ 08 KTS
---
24 HRS, VALID AT:
141800Z --- 16.6N 88.8E
MAX SUSTAINED WINDS - 110 KT, GUSTS 135 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 045 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT
065 NM SOUTHEAST QUADRANT
065 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT
130 NM SOUTHEAST QUADRANT
115 NM SOUTHWEST QUADRANT
125 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 355 DEG/ 09 KTS
---
36 HRS, VALID AT:
150600Z --- 18.4N 88.6E
MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 040 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 065 NM NORTHEAST QUADRANT
065 NM SOUTHEAST QUADRANT
065 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT
130 NM SOUTHEAST QUADRANT
120 NM SOUTHWEST QUADRANT
125 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 360 DEG/ 10 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
151800Z --- 20.4N 88.6E
MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
055 NM SOUTHWEST QUADRANT
055 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT
130 NM SOUTHEAST QUADRANT
120 NM SOUTHWEST QUADRANT
125 NM NORTHWEST QUADRANT
---
REMARKS:
132100Z POSITION NEAR 14.0N 89.4E.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 131800Z IS 32 FEET.
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Derek Ortt

#218 Postby Derek Ortt » Tue Nov 13, 2007 3:18 pm

ECMWF is still into Bangladesh, though as an open wave (at least on the 2.5 degree resolution I am getting)

UKMET turns this to the west just ebfore Bangladesh, though its weakening looks artificial.

I wonder if the models are having some issues with the Plateau of Tibet
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Re: 06B - Sidr models thread

#219 Postby hcane27 » Tue Nov 13, 2007 3:22 pm

Image
updated for 12z QLM
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#220 Postby Squarethecircle » Tue Nov 13, 2007 3:27 pm

That's weird... Is it just me or is the eye filling in AGAIN?
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