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Hurricane Elsa


WxWatcher007
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1 hour ago, Prospero said:

I will say, over the past few years, with Tampa Bay in and out of cones now and then, I do not remember consistently being in the middle of any cone for a few days solid.

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I know. I’m in Seminole and have watched these for 30 years and haven’t seen us dead aimed in the cone for this many days. Lucky this isn’t a cat3 or bigger. I would be freaking out. Even the Irma cone flip flopped but generally stayed east. Harvey freaked me out though that was the only one where the cone lasted about a day or two on us right to the end. I had the wood and screws ready but didn’t use them cause it kept nudging south on radar despite the cone not shifting. 

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Even with the weird trends with this storm, gotta give credit to the NHC for getting the forecast center line almost dead on five days ago, threading the needle through Haiti and Jamaica and going just south of that little Cuba peninsula. Also besides for the few hours when it got to a hurricane, they got the intensity forecast pretty well too. Pretty impressive. 

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1 hour ago, cptcatz said:

Even with the weird trends with this storm, gotta give credit to the NHC for getting the forecast center line almost dead on five days ago, threading the needle through Haiti and Jamaica and going just south of that little Cuba peninsula. Also besides for the few hours when it got to a hurricane, they got the intensity forecast pretty well too. Pretty impressive. 

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Grade A+ forecast on this one, even with gigantic model disagreement for days 

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2 minutes ago, MattPetrulli said:

Pressure at 5 PM was 1009 MB and its down to 1005 MB at 8 PM so I am not understanding. 

 

 

It is down, just such an abnormally high pressure for a 50 kt storm. Has been higher than you’d expect the entire life of the system even when it was a hurricane. 

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53 minutes ago, NorthHillsWx said:

It is down, just such an abnormally high pressure for a 50 kt storm. Has been higher than you’d expect the entire life of the system even when it was a hurricane. 

Ohhhhh I misinterpreted that as I thought you said I made a typo. Yeah right now seems actually like an actual tropical storm for the first time in about a day and a half.

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Tropical Storm Elsa Discussion Number  19
NWS National Hurricane Center Miami FL       AL052021
1100 PM EDT Sun Jul 04 2021

Similar to this time last night, Elsa has undergone another 
convective bursting pattern, except that tonight this has translated 
into at least some slight strengthening. An Air Force Reserve 
reconnaissance aircraft investigating the cyclone this evening has 
found maximum 850-mb flight-level winds of 55 kt and reliable SFMR 
surface winds of about 55 kt. Although there have been SFMR winds of 
60 kt or more reported northeast and north of the center, those 
values appear to be contaminated by shoaling and/or breaking waves 
owing to the shallow water flowing in and around the offshore Cayo 
Anclitas and Cayo Pingues archipelagos. The estimated center 
pressure of 1004 mb based on dropsonde data also does a higher 
intensity of 60 kt. Therefore, based on the most reliable data, the 
intensity has been increased to 55 kt.

The initial motion estimate is 310/13 kt.  There remains no 
significant change to the previous few track forecasts and synoptic 
reasonings. Elsa is expected to move northwestward and then 
northward around the western periphery of a mid-level subtropical 
ridge during the next 3 days, followed by acceleration toward the 
northeast on days 4 and 5 as the cyclone moves near the southeast 
U.S. coast and then over the northwestern Atlantic. The new NHC 
track forecast is basically just an update and extension of the 
previous advisory track, and lies close to a blend of the tightly 
packed corrected consensus model HCCA and the simple consensus 
models TVCA and GFEX.

Cuban radar data from Pilan and Camaguey have occasionally revealed 
an eye-like feature in the low -and mid-levels of the cyclone where 
cloud top temperatures have been colder than -80C and also where 
significant lightning activity has been occurring. Given that the 
circulation centers have become better aligned and the upper-level 
outflow pattern is well-established and steadily improving, some 
additional strengthening during the next 12 h is forecast, which 
calls for Elsa to be near hurricane strength before landfall occurs 
along the south-central coast of Cuba tomorrow. Over the eastern 
Gulf of Mexico late Monday and Tuesday, some restrengthening is 
forecast after Elsa clears Cuba, but southwesterly vertical wind 
shear is expected to hinder the intensification process.  The 
official intensity forecast remains on the high side of the 
numerical model guidance, and follows a blend of the HCCA intensity 
consensus model, and the LGEM and and Decay-SHIPS 
statistical-dynamical models.

Key Messages:

1. Widespread heavy rain will continue to affect portions of Jamaica 
tonight where isolated to scattered flash flooding and mudslides 
will be possible. Heavy rain will then impact the Cayman Islands and 
Cuba tonight into Monday resulting in significant flooding and 
mudslides over Cuba. As Elsa approaches the Florida Keys, Florida 
Peninsula, and coastal Georgia Monday through Wednesday, heavy 
rainfall may result in isolated flash, urban, and minor river 
flooding.  Mid to late week, heavy rains across coastal South 
Carolina may result in isolated flash flooding.

2. Tropical storm conditions and a dangerous storm surge are
expected with hurricane conditions possible in portions of eastern
Cuba tonight.  Tropical storm conditions are expected in portions
of central and western Cuba tonight and Monday, and will spread
into portions of the Florida Keys by late Monday.

3. Tropical Storm and Surge Surge Watches are in effect for
portions of the west coast of the Florida peninsula where tropical
storm conditions and a dangerous storm surge are possible beginning
as early as Monday night and continuing into Tuesday.

4. There is a risk of tropical storm conditions, storm surge,
and rainfall impacts along the remainder of the Florida Peninsula
Tuesday night through Wednesday and the coasts of Georgia and the
Carolinas Wednesday and Thursday.


FORECAST POSITIONS AND MAX WINDS

INIT  05/0300Z 20.6N  79.2W   55 KT  65 MPH
 12H  05/1200Z 21.9N  80.7W   60 KT  70 MPH
 24H  06/0000Z 23.5N  82.1W   50 KT  60 MPH
 36H  06/1200Z 25.1N  82.9W   50 KT  60 MPH
 48H  07/0000Z 27.1N  83.2W   50 KT  60 MPH
 60H  07/1200Z 29.2N  82.8W   45 KT  50 MPH...INLAND
 72H  08/0000Z 31.5N  81.6W   35 KT  40 MPH...INLAND
 96H  09/0000Z 36.0N  76.0W   35 KT  40 MPH...INLAND
120H  10/0000Z 41.0N  66.8W   40 KT  45 MPH...OVER WATER

$$
Forecaster Stewart
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Vigorous outer rainband pushing towards SE FL coast. Right now it's hitting Bimini. Remains to be seen if it will get all the way here, but I think chances are it will since this band has been steadily intensifying, and it has some very deep convection. 

There have been several times in my life where an approaching cyclone sends out a really aggressive furthermost outer band, and it can catch people by surprise with winds of 40-60 mph, downed trees, power outages, etc... I think this could end up being one of those cases.

Aside from that, another smaller band taking shape over Florida Keys and extending into coastal Miami-Dade. So impacts are just beginning now for SE FL. 

Perfect timing, will clear out all this smoke from the fireworks as soon as we get a band. 

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35 minutes ago, turtlehurricane said:

Vigorous outer rainband pushing towards SE FL coast. Right now it's hitting Bimini. Remains to be seen if it will get all the way here, but I think chances are it will since this band has been steadily intensifying, and it has some very deep convection. 

There have been several times in my life where an approaching cyclone sends out a really aggressive furthermost outer band, and it can catch people by surprise with winds of 40-60 mph, downed trees, power outages, etc... I think this could end up being one of those cases.

Aside from that, another smaller band taking shape over Florida Keys and extending into coastal Miami-Dade. So impacts are just beginning now for SE FL. 

Perfect timing, will clear out all this smoke from the fireworks as soon as we get a band. 

I recall Gustav having a feature like this in New Orleans at the start of the storm. 

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Not exactly OT, did the FSU Super Ensemble, which even FSU people I knew via internet could not see, which used many of the major models and ensembles and somehow bias corrected them and averaged them and was apparently quite useful, disappear.  Just thinking I have not seen the FSU Super Ensemble mentioned in a few years in NHC discos.

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Product: NOAA Vortex Message (URNT12 KWBC)
Transmitted: 5th day of the month at 11:24Z
Agency: National Oceanic and Atmospheric Administration (NOAA) 
Aircraft: Lockheed WP-3D Orion (Reg. Num. N42RF) 
Storm Name: Elsa
Storm Number & Year: 05 in 2021 (flight in the North Atlantic basin)
Mission Number: 11
Observation Number: 04 ( See all messages of this type for this mission. )

A. Time of Center Fix: 5th day of the month at 10:40:04Z
B. Center Fix Coordinates: 21.29N 80.64W
B. Center Fix Location: 61 statute miles (99 km) to the SSW (192°) from Cienfuegos, Cuba.
C. Minimum Height at Standard Level: 3,144m (10,315ft) at 700mb
D. Minimum Sea Level Pressure: 1008mb (29.77 inHg)
E. Dropsonde Surface Wind at Center: From 205° at 19kts (From the SSW at 22mph)
F. Eye Character: Not Available
G. Eye Shape: Not Available
H. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 52kts (59.8mph)
I. Location & Time of the Estimated Maximum Surface Wind Inbound: 61 nautical miles (70 statute miles) to the NNW (333°) of center fix at 10:21:43Z
J. Maximum Flight Level Wind Inbound: From 105° at 30kts (From the ESE at 34.5mph)
K. Location & Time of the Maximum Flight Level Wind Inbound: 33 nautical miles (38 statute miles) to the N (3°) of center fix at 10:31:26Z
L. Estimated (by SFMR or visually) Maximum Surface Wind Outbound: 54kts (62.1mph)
M. Location & Time of the Estimated Maximum Surface Wind Outbound: 18 nautical miles (21 statute miles) to the SE (144°) of center fix at 10:44:36Z
N. Maximum Flight Level Wind Outbound: From 195° at 42kts (From the SSW at 48.3mph)
O. Location & Time of the Maximum Flight Level Wind Outbound: 106 nautical miles (122 statute miles) to the SE (132°) of center fix at 11:09:33Z
P. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 9°C (48°F) at a pressure alt. of 3,144m (10,315ft)
Q. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 10°C (50°F) at a pressure alt. of 3,068m (10,066ft)
R. Dewpoint Temp (collected at same location as temp inside eye): 7°C (45°F)
R. Sea Surface Temp (collected at same location as temp inside eye): Not Available
S. Fix Determined By: Penetration, Wind and Temperature
S. Fix Level: 700mb
T. Navigational Fix Accuracy: 0.01 nautical miles
T. Meteorological Accuracy: 2 nautical miles

Remarks Section:
 

Maximum Flight Level Wind: 42kts (~ 48.3mph) which was observed 106 nautical miles (122 statute miles) to the SE (132°) from the flight level center at 11:09:33Z
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13 hours ago, Vice-Regent said:

The whole weakening bit was predicated on a disrupted or non-existent circulation. 20kts of shear is like a stimulating breeze for a well-developed TC.

Significant strengthening is not anticipated though due to moderate
wind shear
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Well, that aggressive outer band fell apart, and all we got was a sprinkle around sunrise. Now a very light easterly wind and sunny. 

That being said, we're getting tons of daytime heating now, and when the next convergence bands roll in it will probably be an explosive squall event. Might take till many hours from now for that to happen tho, since radar is pretty much empty between here and Cuba.

I guess the real storminess will start here tonight once Elsa enters the Florida straits.

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20 minutes ago, turtlehurricane said:

Well, that aggressive outer band fell apart, and all we got was a sprinkle around sunrise. Now a very light easterly wind and sunny. 

That being said, we're getting tons of daytime heating now, and when the next convergence bands roll in it will probably be an explosive squall event. Might take till many hours from now for that to happen tho, since radar is pretty much empty between here and Cuba.

I guess the real storminess will start here tonight once Elsa enters the Florida straits.

But aren't you in space?

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26 minutes ago, JakkelWx said:

But aren't you in space?

You are in space too. Everyone is in space. Space is all around us, and no one isn't in space. 

Starting to get a nice breeze here in space, maybe gusts of 20 mph. The first real signs of Elsa's circulation. Clouds rotating cyclonically through the sky too. Radar shows a fresh outer band shooting through Florida Straits. 

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SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...21.5N 81.2W
ABOUT 20 MI...35 KM ESE OF CAYO LARGO CUBA
ABOUT 140 MI...225 KM SSE OF HAVANA CUBA
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 14 MPH...22 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The Tropical Storm Warning along the west coast of Florida has been
extended northward to the Suwannee River, including Tampa Bay.

The Storm Surge Watch along the west coast of Florida has 
been extended northward to the Ochlockonee River. 

The Tropical Storm Watch along the coast of the Florida panhandle
has been extended westward to Indian Pass, Florida.

The government of Cuba has discontinued all watches and warnings
for the Cuban province of Camaguey.

The government of Cuba has changed the Hurricane Warning for the
Cuban provinces of Cienfuegos and Matanzas to a Tropical Storm
Warning, and has issued a Tropical Storm Warning for the Cuban
province of Artemisa.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Tropical Storm Warning is in effect for...
* The Cuban provinces of Ciego de Avila, Sancti Spiritus,
Cienfuegos, Matanzas, Villa Clara, Mayabeque, Havana, and Artemisa
* The Florida Keys from Craig Key westward to the Dry Tortugas
* West coast of Florida from Flamingo northward to Suwannee River

A Storm Surge Watch is in effect for...
* West coast of Florida from Bonita Beach to the Ochlockonee River

A Tropical Storm Watch is in effect for...
* The Florida Keys from east of Craig Key to Ocean Reef
* Florida Bay
* North of the Suwannee River to Indian Pass, Florida
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4 minutes ago, turtlehurricane said:

Elsa has connected with the Jet Stream. This could help fuel intensification and expansion of the storm, and it will particularly enhance rain/wind coverage in the NE quadrant. Very exciting stuff!

GOES16-CAR-08-1000x1000.gif

SNE is certainly happy about the new GFS coming in. Seems like Isasis all over again.

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A slight nudge east on the 12z GFS run while the Canadian brings it onshore at Tampa. Will be interesting to see if the Euro nudges east a bit or not. Not a huge difference in track but 50 miles west/east with a storm skirting the FL coast makes for big impact differential. 

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