Dr. Jeff Masters' WunderBlog

Adieu to Danny
Posted by: Dr. Jeff Masters, 9:50 AM GMT en Agosto 29, 2009 +0
Hi, Dr. Rob Carver filling in for Dr. Masters. With the 5AM EST update, NHC has discontinued issuing the tropical storm watches and will no longer issue any updates about the storm. Danny has gone extratropical and has merged with a frontal low off the Carolina coast. The most recent aircraft reconnaissance flight was unable to find a cyclonic circulation or tropical storm force winds in the remnants of Danny.

That isn't to say that Danny's remnants don't pose an element of risk for the East Coast. High surf from large swells is expected along the East Coast. New England can expect to see a lot of rain as Denny's remnants fly by.

Invest 94L

Invest 94L is still out near South America, but it's convective activity seems to be cycling down right now. The global models (GFS and GEM) do pull 94L (to be precise, a feature that could be 94L) north of the Lesser Antilles. Given how the GFDL has performed with other Invests this season, I can wait a day or so before they run the GFDL for this storm.

East Pacific and elsewhere

For those of you wanting to look at tropical storms, Jimena has just formed in the Eastern Pacific basin. The track uncertainty is fairly large, so I'll be keeping an eye on this storm to see if it will impact Mexico or the American Southwest. In the Western Pacific, Tropical Storm Krovahn looks like it will be grazing the Japanese coastline just east of Tokyo Bay.

I'll give Invest94L a chance to see the Sun and then I'll update this entry.

Update:1545 EDT

G'afternoon everybody, Invest94L has perked up a little since this's morning blog entry. In my judgment, the extent and peak magnitude of convection has increased, and scatterometer data shows that Invest94L has a weak cyclonic circulation. Here's the 9Z ascending pass:

Quickscat Pass over Invest94L
Figure 1Ascending Quikscat pass centered over Invest94L at 9Z Aug 29 2009.

There will be a big update tonight after the 00Z model cycle data comes in.
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1851. tornadodude 5:11 AM GMT en Agosto 30, 2009    
Quoting iceman55:
iceman55:
slidell la .why

oh cool, i was just wondering. like to get to know people on here a little bit
Member Since: Junio 28, 2006 Posts: 22 Comments: 7816
1854. serialteg 5:12 AM GMT en Agosto 30, 2009    
Looks like shear is mostly to the N:

Link
Member Since: Agosto 22, 2006 Posts: 2 Comments: 1966
1855. szqrn1 5:12 AM GMT en Agosto 30, 2009    
hello...havent been in here in a while where is 94 going??
Member Since: Agosto 18, 2007 Posts: 0 Comments: 392
1857. TampaSpin 5:13 AM GMT en Agosto 30, 2009    
1846. vince1966 1:09 AM EDT on August 30, 2009
Quoting edmac:
Where do you think 94l, given it develops, will end up. Any takers
Gomex


Cross South Florida into the GOM

Member Since: Septiembre 2, 2007 Posts: 175 Comments: 19747
1858. tornadodude 5:13 AM GMT en Agosto 30, 2009    
Quoting szqrn1:
hello...havent been in here in a while where is 94 going??

well, i think it is going to head in the general direction of FL, but at this point, who knows
Member Since: Junio 28, 2006 Posts: 22 Comments: 7816
1859. TampaSpin 5:14 AM GMT en Agosto 30, 2009    
Quoting szqrn1:
hello...havent been in here in a while where is 94 going??


Go to my update at LINK
Member Since: Septiembre 2, 2007 Posts: 175 Comments: 19747
1864. THUNDERPR 5:15 AM GMT en Agosto 30, 2009    
Station 41041
Wind Direction (WDIR): NE ( 40 deg true )
Wind Speed (WSPD): 21.4 kts
Wind Gust (GST): 25.3 kts
Atmospheric Pressure (PRES): 29.82 in
Pressure Tendency (PTDY): -0.07 in ( Falling )
Air Temperature (ATMP): 80.1 °F
Water Temperature (WTMP): 80.8 °F
Member Since: Agosto 11, 2006 Posts: 0 Comments: 339
1865. tornadodude 5:16 AM GMT en Agosto 30, 2009    
Quoting Vortex95:


It will make a crazy 8 over Florida and then explode over the GOM into trillions of raindropps which will get 1,000s of sea animals wet.


hahaha thats great
Member Since: Junio 28, 2006 Posts: 22 Comments: 7816
1866. 7544 5:16 AM GMT en Agosto 30, 2009    
Quoting TampaSpin:
1846. vince1966 1:09 AM EDT on August 30, 2009
Quoting edmac:
Where do you think 94l, given it develops, will end up. Any takers
Gomex


Cross South Florida into the GOM



wow heraing this from you this early in the game people should stay alert youre always very close in your forcast keep us updated
Member Since: Mayo 6, 2007 Posts: 0 Comments: 5925
1867. TexasHurricane 5:16 AM GMT en Agosto 30, 2009    
Quoting markymark1973:
94L is slowly getting pulled to the North. Going by the 11pm discussion from the NHC it doesn't have a chance. Maybe the wave coming off of Africa can do something.


Ok, I'm confussed. Does 94l have potential to form or not?
Member Since: Julio 2, 2009 Posts: 0 Comments: 2811
1868. vince1966 5:16 AM GMT en Agosto 30, 2009    
Quoting Vortex95:


It will make a crazy 8 over Florida and then explode over the GOM into trillions of raindropps which will get 1,000s of sea animals wet.
Holy Crap!
Member Since: Julio 28, 2009 Posts: 0 Comments: 59
1870. szqrn1 5:17 AM GMT en Agosto 30, 2009    
Quoting TampaSpin:


Go to my update at LINK


yea TS i was hoping for the easy way out tonight... "fl, gom, tahiti...." ya know the ultra short version... lazy to look tonight!!
Member Since: Agosto 18, 2007 Posts: 0 Comments: 392
1871. JLPR 5:19 AM GMT en Agosto 30, 2009    
Quoting THUNDERPR:
Station 41041
Wind Direction (WDIR): NE ( 40 deg true )
Wind Speed (WSPD): 21.4 kts
Wind Gust (GST): 25.3 kts
Atmospheric Pressure (PRES): 29.82 in
Pressure Tendency (PTDY): -0.07 in ( Falling )
Air Temperature (ATMP): 80.1 °F
Water Temperature (WTMP): 80.8 °F


winds almost sustained at 25mph
seems to be close to TD strength
Member Since: Septiembre 4, 2007 Posts: 36 Comments: 5223
1876. vince1966 5:21 AM GMT en Agosto 30, 2009    
94L has all the right stuff to turn into the dreaded, elusive, HYPERCANE. Able to destroy whole land masses (like Florida) in a single blow. Stay tuned, It just might get ugly... well 10% chance.
Member Since: Julio 28, 2009 Posts: 0 Comments: 59
1878. THUNDERPR 5:21 AM GMT en Agosto 30, 2009    
Preassure continuing falling in that bouy north of the 94L.

Atmospheric Pressure (PRES): 1009.7 mb
Pressure Tendency (PTDY): -2.3 mb ( Falling )
Member Since: Agosto 11, 2006 Posts: 0 Comments: 339
1881. TampaSpin 5:23 AM GMT en Agosto 30, 2009    
Quoting szqrn1:


yea TS i was hoping for the easy way out tonight... "fl, gom, tahiti...." ya know the ultra short version... lazy to look tonight!!


Here are the current location and Stats on Invest 94L:

Invest #94L (Location: Central Atlantic)

Lat: 10.7N Lon: 43.4W

Moving: W 16 mph (14 kts)

Pressure: 29.83 in (1010 mb)

I have decided to break things down into 6 categories of analysis:

Wind Shear--very light wind shear from the SW currently but, stronger shear to its West. But, due to relax in 48-72hrs.

SST's (water temperature)--94L just entered an area of 30deg Celicius temps.

SAL and Dust (Dry and Dust air)--still moving in an area of dry air, but 94L seems to be making its on moist environment.

Vorticity--the voricity is stacked at all levels, but is very oblong shaped. Very open wave with nothing closed yet.

Convergence--some lower convergence is present. But, not much!

Divergence--some upper level divergence is present. But, again not much and not stacked with the convergence.



Based upon the above, one would have to conclude that Invest 94L is poorly organized. That is a fact. It is just entering waters that is nearly 2deg warmer than where it was. This alone will enhance the possibility of development. Invest 94L is moving into and presently in a mass of Dry air but, 94L seems to making its own moisture environment which shows a lot of character for such a poorly organized system. With Voricity stacked at all levels the convergence should increase. There appears to be an anit-cyclone to its NE that should help the divergence and vent 94L.


With the above analysis i would have to think that 94L has a good possibility of developing. Looking at Satelitte, the overall structure seems to be improving.

Now the question would be, Where is it going? Most models are indicating a path just Northe of the islands and Puerto Rico. I do favor that track but, i will say that the Northern islands and Puerto Rico is not out of the possibility of a direct Path. Assuming it does go North of the islands which i do favor in the forecast. Invest 94L will turn to the West very quickly as High Pressure will build to its North sending 94L straight toward the ConUs. Don't panic yet but, currently there appears to be a possible trough that might develop just before a South Florida hit. This might be very close. Now, keep in mind this is of course assuming that 94L does develop.

My current forecast for Invest 94L is for slow development over the next 24hrs and then after becoming more organized a Named storm in 72hrs just before reaching the Northern Islands. I do foresee a Tropical Storm just north of Pureto Rico and a Hurricane moving into the Bahamas toward nearing South Florida as High Pressure will send the system back to the West. I hate to use this word but, Andrew had nearly the exact setup as 94L will assume. We must watch this system VERY, VERY, CLOSE! I not wishcasting by any means and this is my honest opinion. But, again don't panic as things can change!

My Tropical Prediction Analysis give 94L a 25% above average chance of further development.
Member Since: Septiembre 2, 2007 Posts: 175 Comments: 19747
1883. 7544 5:23 AM GMT en Agosto 30, 2009    
Quoting iceman55:
blackout come soon da


yeap and after we might see a big red ball 3am is the best time to see whats happening imo est
Member Since: Mayo 6, 2007 Posts: 0 Comments: 5925
1884. nolacane2009 5:23 AM GMT en Agosto 30, 2009    
Is there an update coming out soon?
Member Since: Agosto 19, 2009 Posts: 0 Comments: 248
1889. THUNDERPR 5:26 AM GMT en Agosto 30, 2009    
See the 5:00 utc image here convection continuing increase in 94L. Link
Member Since: Agosto 11, 2006 Posts: 0 Comments: 339
1891. JLPR 5:28 AM GMT en Agosto 30, 2009    
Quoting TampaSpin:


Here are the current location and Stats on Invest 94L:

Invest #94L (Location: Central Atlantic)

Lat: 10.7N Lon: 43.4W

Moving: W 16 mph (14 kts)

Pressure: 29.83 in (1010 mb)

I have decided to break things down into 6 categories of analysis:

Wind Shear--very light wind shear from the SW currently but, stronger shear to its West. But, due to relax in 48-72hrs.

SST's (water temperature)--94L just entered an area of 30deg Celicius temps.

SAL and Dust (Dry and Dust air)--still moving in an area of dry air, but 94L seems to be making its on moist environment.

Vorticity--the voricity is stacked at all levels, but is very oblong shaped. Very open wave with nothing closed yet.

Convergence--some lower convergence is present. But, not much!

Divergence--some upper level divergence is present. But, again not much and not stacked with the convergence.



Based upon the above, one would have to conclude that Invest 94L is poorly organized. That is a fact. It is just entering waters that is nearly 2deg warmer than where it was. This alone will enhance the possibility of development. Invest 94L is moving into and presently in a mass of Dry air but, 94L seems to making its own moisture environment which shows a lot of character for such a poorly organized system. With Voricity stacked at all levels the convergence should increase. There appears to be an anit-cyclone to its NE that should help the divergence and vent 94L.


With the above analysis i would have to think that 94L has a good possibility of developing. Looking at Satelitte, the overall structure seems to be improving.

Now the question would be, Where is it going? Most models are indicating a path just Northe of the islands and Puerto Rico. I do favor that track but, i will say that the Northern islands and Puerto Rico is not out of the possibility of a direct Path. Assuming it does go North of the islands which i do favor in the forecast. Invest 94L will turn to the West very quickly as High Pressure will build to its North sending 94L straight toward the ConUs. Don't panic yet but, currently there appears to be a possible trough that might develop just before a South Florida hit. This might be very close. Now, keep in mind this is of course assuming that 94L does develop.

My current forecast for Invest 94L is for slow development over the next 24hrs and then after becoming more organized a Named storm in 72hrs just before reaching the Northern Islands. I do foresee a Tropical Storm just north of Pureto Rico and a Hurricane moving into the Bahamas toward nearing South Florida as High Pressure will send the system back to the West. I hate to use this word but, Andrew had nearly the exact setup as 94L will assume. We must watch this system VERY, VERY, CLOSE! I not wishcasting by any means and this is my honest opinion. But, again don't panic as things can change!

My Tropical Prediction Analysis give 94L a 25% above average chance of further development.


thank you
that was a great analysis!
You should give it the title
''All you want to know about 94L'' lol xD
Member Since: Septiembre 4, 2007 Posts: 36 Comments: 5223
1893. tornadodude 5:29 AM GMT en Agosto 30, 2009    
Quoting JLPR:


thank you
that was a great analysis!
You should give it the title
''All you want to know about 94L'' lol xD


haha agreed
Member Since: Junio 28, 2006 Posts: 22 Comments: 7816
1894. THUNDERPR 5:29 AM GMT en Agosto 30, 2009    
New gfdl 00z for 94L 126 Hours 25.2 57.1 325./ 7.2

Member Since: Agosto 11, 2006 Posts: 0 Comments: 339
1895. homelesswanderer 5:29 AM GMT en Agosto 30, 2009    
A RATHER STRONG 1025MB HIGH IS EXPECTED TO SETTLE OVER THE NRN MS
VALLEY AND GREAT LAKES REGION FOR MUCH OF THE UPCOMING
WEEK...RIDGING WELL SOUTH INTO LA AND ERN TX.
A QUIET WEATHER
PATTERN LOOKS TO BE IN PLACE MONDAY THROUGH THURSDAY. LOWER
DEWPOINTS WILL PROVIDE FOR MORE COMFORTABLE CONDITIONS...WITH
COOLER THAN NORMAL MINIMUMS DURING THE EARLY MORNING HOURS. AFTN
HIGHS WILL CONTINUE TO BE WARM WITH TEMPS IN THE UPPER 80S TO LOWER
90S.

LOW LEVEL MOISTURE WILL BEGIN TO INCREASE AGAIN LATE IN THE WEEK
AS THE HIGH SHIFTS EAST AND SOUTHERLY WINDS RETURN.
THIS WILL
BRING A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS FRIDAY INTO
SATURDAY

This is from local NWS. Would this high have an affect on 94l track if it develops? Just wondering if this is the beginning of the negative NAO or just temporary until another trough comes through.
Member Since: Agosto 15, 2008 Posts: 10 Comments: 3665
1897. TampaSpin 5:33 AM GMT en Agosto 30, 2009    
Quoting homelesswanderer:
A RATHER STRONG 1025MB HIGH IS EXPECTED TO SETTLE OVER THE NRN MS
VALLEY AND GREAT LAKES REGION FOR MUCH OF THE UPCOMING
WEEK...RIDGING WELL SOUTH INTO LA AND ERN TX.
A QUIET WEATHER
PATTERN LOOKS TO BE IN PLACE MONDAY THROUGH THURSDAY. LOWER
DEWPOINTS WILL PROVIDE FOR MORE COMFORTABLE CONDITIONS...WITH
COOLER THAN NORMAL MINIMUMS DURING THE EARLY MORNING HOURS. AFTN
HIGHS WILL CONTINUE TO BE WARM WITH TEMPS IN THE UPPER 80S TO LOWER
90S.

LOW LEVEL MOISTURE WILL BEGIN TO INCREASE AGAIN LATE IN THE WEEK
AS THE HIGH SHIFTS EAST AND SOUTHERLY WINDS RETURN.
THIS WILL
BRING A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS FRIDAY INTO
SATURDAY

This is from local NWS. Would this high have an affect on 94l track if it develops? Just wondering if this is the beginning of the negative NAO or just temporary until another trough comes through.


This is the High that i talked about in my update and will force 94L to the WEST....HONESTLY all this High does not appear to move at all......NOT GOOD SETUP COMING!
Member Since: Septiembre 2, 2007 Posts: 175 Comments: 19747
1898. tornadodude 5:33 AM GMT en Agosto 30, 2009    
International Falls, MN
Falls International Airport
Lat: 48.58 Lon: -93.38 Elev: 1179
Last Update on Aug 29, 11:55 pm CDT

Fair

37 °F
(3 °C)
Humidity: 96 %
Wind Speed: Calm
Barometer: 30.22" (1024.4 mb)
Dewpoint: 36 °F (2 °C)
Visibility: 10.00 mi
Member Since: Junio 28, 2006 Posts: 22 Comments: 7816
1899. JLPR 5:34 AM GMT en Agosto 30, 2009    
starting to look a little interesting
Before:

and After:

Member Since: Septiembre 4, 2007 Posts: 36 Comments: 5223
1900. szqrn1 5:34 AM GMT en Agosto 30, 2009    
TS.... thanks .... my non-meterologic brain absorbed every drop! LOL... kidding but thanks! :)
Member Since: Agosto 18, 2007 Posts: 0 Comments: 392

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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