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Tropical Depression Don


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I thik my early guess, not a whole lot of science, just a quick glance at trends and models, from a day ago, Matamoros or just South, 60 knots, is actually pretty close. Not in the ddwxman league of instability tropical wather analysts, just a SWAG.

60 knots, maybe a tad high, carried away by the enthusiasm of the pro-mets.

hey 65mph is my forecast, initially we all thought higher though!

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If the low level vortex is not getting dragged by the mid level vortex, then this thing is going to decouple, the best convection is around 24N... if the center of the low is around 25N, then they are going to part ways soon, like many models have suggested...which would mean a weakening Don making landfall.

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When I saw the name "Don" in the list a few years ago I pictured a large lumbering hurricane. This has been quite the opposite.

I kinda did too...but I also thought the same for Hurricane "Gaston".

I'd venture that our big August/September storms will likely be Gert, Harvey or Irene similar to 2008 (Dolly in late July, Gustav-Hanna-Ike were the biggies)

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0z HWRF is exactly on the border, and stronger. I guess most of the guidance will follow suit, and a significant shift south by the NHC with surprise watches and warnings for MX will ensue.

Even if this thing makes landfall exactly on the border, Josh still has the right idea staying in TX (issues with crossing the border aside) so he can reap the benefits of being in the right-front quadrant :thumbsup:

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Meanwhile... CIMSS shows a pretty large pocket of 5 knots or less of shear that is directly in the path of Don... maybe the shear will finally led up enough for the convection to wrap around the center on a more consistent basis?

Yeah, I'm hoping it can pull a little magic overnight with the dmax-- or during the day tomorrow. We still have some time.

Even if this thing makes landfall exactly on the border, Josh still has the right idea staying in TX (issues with crossing the border aside) so he can reap the benefits of being in the right-front quadrant :thumbsup:

:)

Thanks. Yeah, we'd be cool with a landfall right at the border-- it would give TX the best action, probably.

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The new (1 am CDT) advisory position is 25.0N 93.0W-- meaning the cyclone has started gaining latitude again. That sustains the threat to TX-- however, it also suggests a somewhat disorganized system, as it puts the center on the N edge of the convection (a recurring theme with this storm).

One other detail-- the pressure has risen back up to 1003 mb. Grrr.

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The new (1 am CDT) advisory position is 25.0N 93.0W-- meaning the cyclone has started gaining latitude again. That sustains the threat to TX-- however, it also suggests a somewhat disorganized system, as it puts the center on the N edge of the convection (a recurring theme with this storm).

One other detail-- the pressure has risen back up to 1003 mb. Grrr.

Strange, the pressure goes in contrast with the last VDM, I guess it didn't arrive in time.

Product: Air Force Vortex Message (URNT12 KNHC)

Transmitted: 29th day of the month at 06:07Z

Aircraft: Air Force Aircraft (Last 3 digits of the tail number are 307)

Storm Number & Year: 04L in 2011

Storm Name: Don (flight in the North Atlantic basin)

Mission Number: 4

Observation Number: 18

A. Time of Center Fix: 29th day of the month at 5:35:40Z

B. Center Fix Coordinates: 24°59'N 92°56'W (24.9833N 92.9333W)

B. Center Fix Location: 292 miles (469 km) to the ESE (103°) from Brownsville, TX, USA.

C. Minimum Height at Standard Level: 1,455m (4,774ft) at 850mb

D. Estimated (by SFMR or visually) Maximum Surface Wind: 26kts (~ 29.9mph)

E. Location of the Estimated Maximum Surface Wind: 17 nautical miles (20 statute miles) to the NW (318°) of center fix

F. Maximum Flight Level Wind Inbound: From 81° at 34kts (From the E at ~ 39.1mph)

G. Location of Maximum Flight Level Wind Inbound: 13 nautical miles (15 statute miles) to the NW (319°) of center fix

H. Minimum Sea Level Pressure: 1000mb (29.53 inHg) - Extrapolated

I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 21°C (70°F) at a pressure alt. of 1,524m (5,000ft)

J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 27°C (81°F) at a pressure alt. of 1,527m (5,010ft)

K. Dewpoint Temp (collected at same location as temp inside eye): 14°C (57°F)

K. Sea Surface Temp (collected at same location as temp inside eye): Not Available

L. Eye Character: Not Available

M. Eye Shape: Not Available

N. Fix Determined By: Penetration, Wind, Pressure and Temperature

N. Fix Level: 850mb

O. Navigation Fix Accuracy: 0.02 nautical miles

O. Meteorological Accuracy: 2 nautical miles

Remarks Section:

Maximum Wind Outbound: 46kts (~ 52.9mph) in the northeast quadrant at 5:56:40Z

Maximum Flight Level Wind: 46kts (~ 52.9mph) in the northeast quadrant at 5:56:40Z

Sea Level Pressure Extrapolation From: 850mb

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Even if this thing makes landfall exactly on the border, Josh still has the right idea staying in TX (issues with crossing the border aside) so he can reap the benefits of being in the right-front quadrant :thumbsup:

Look at the IR...there's no right front quad :P

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haha, well despite the lack of convection, the winds are still decent. In fact its the only quadrant that has been showing FL winds of tropical storm force.

Good luck translating them to the surface... at least an observer could see the cirrus by passing real quick. A clear day gale!

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