Andrea Intensifies to a 60 mph Tropical Storm, Spawns 5 Tornadoes in Florida

By: Dr. Jeff Masters , 1:30 PM GMT on June 06, 2013

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Tropical Storm Andrea has exceeded expectations. An Air Force hurricane hunter plane flying through Andrea near 3 am EDT found that a strong band of heavy thunderstorms with moderate turbulence and intense lightning had wrapped partway around the center, and Andrea had intensified into a respectable tropical storm with 60 mph sustained winds and a central pressure of 997 mb. The intensification occurred despite the presence of a large area of dry air to the storm's west, and high wind shear of 25 knots. Satellite loops show that Andrea has expanded in size this morning, and its heavy thunderstorms have become more intense. The heaviest thunderstorms were in a band well away from the center, extending from Tampa southwestwards over the Gulf of Mexico. There is a large slot of dry air behind this band, and Andrea may be able to close this intrusion of dry air off early this afternoon, and build additional heavy thunderstorms near its center. However, given the continued presence of dry air and increasing wind shear, and little time before landfall, it will be difficult for Andrea to reach hurricane strength before landfall occurs early this evening--though I won't rule out intensification to a 70 mph tropical storm. Heavy rains of 3 - 6" that have the potential to cause flash flooding will be the storm's main threat. Carrabelle, near Apalachicola, reported 4.5" of rain in a 5-hour period ending at 8 am EDT. Tornadoes in some of the heavier thunderstorms in Andrea's spiral bands are also a concern, and the storm had already spawned five tornadoes as of 9 am EDT. Bands of heavy thunderstorms with embedded rotating thunderstorms capable of generating tornadoes where over both the west and east coasts of Florida between 6 am - 8am, triggering tornado warnings in the counties near Fort Lauderdale and Tampa Bay. A tornado hit The Acreage in Palm Beach County at 6:45 am EDT, injuring one person, damaging homes, and downing trees and power lines. Two other tornadoes were reported on Florida's east coast, one in Broward County, and one in Palm Beach County. Andrea also spawned two tornadoes southeast of Tampa Bay between 2:30 am and 4 am EDT Thursday, but damage was minor. Most of South and Central Florida are under a tornado watch today. A storm surge of 2 - 5 feet is predicted for Tampa Bay northward to Apalachicola, and rip currents will be a risk for swimmers who brave the high surf. As of 9 am EDT Thursday, our wundermap with the storm surge layer turned on was showing storm surge levels just over 1 foot near Tampa and Apalachicola on Florida's Gulf Coast.

We won't have any new wind measurements from the Hurricane Hunters until about 3 pm EDT. Buoy 42036, 122 miles west-northwest of Tampa, reported sustained winds of 40 mph, gusting to 51 mph, between 7 am - 8 am EDT, when the center of Andrea was located about 60 miles to the south-southwest. Winds at a personal weather station at Bald Point State Park near Apalachicola hit 39 mph at 9 am EDT. Winds at Cedar Key were sustained at 28 mph, gusting to 34 mph, at 8:33 am EDT.



Figure 1. Composite radar reflectivity image of Tropical Storm Andrea at 9 am EDT Thursday, June 6, 2013.

Andrea's place in history
Andrea formed in a typical location for early-season storms. The Gulf of Mexico, Western Caribbean, and Bahamas are the usual areas for the genesis of June tropical storms. Andrea's formation date of June 5 is over a month earlier than the average July 9 date for formation of the season's first named storm. On average, the Atlantic sees one June named storm every two years. In 2012, we'd already had two named storms by this point in the season--Alberto and Beryl. This year is the second time a storm named Andrea has appeared in the Atlantic. The previous incarnation, Subtropical Storm Andrea of 2007, wandered off the U.S. East Coast in May, and never made landfall. The 2013 version of Andrea is highly unlikely to get its name retired, and we'll be seeing a third coming of the storm in 2019.

Jeff Masters

Andrea gave us a lake (LakeWorthFinn)
... in our yard this morning
Andrea gave us a lake

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Folks on the southwest gulf coast be aware


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 284
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT THU JUN 6 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EAST CENTRAL AND SOUTHEAST TEXAS
COASTAL WATERS

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES NORTHWEST OF
HUNTSVILLE TEXAS TO 20 MILES SOUTHEAST OF GALVESTON TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 283...

DISCUSSION...STORMS ARE INCREASING OVER EAST CENTRAL TX NEAR THE
INTERSECTION OF AN OUTFLOW BOUNDARY ARCING NW/SE ACROSS ERN TX AND A
WEAK COLD FRONT MOVING EWD. ACTIVITY IS IN THE SRN PORTION OF A
VORTICITY MAX MOVING EWD TOWARD NERN TX. STRONGER WNWLY WINDS ALOFT
TO THE SOUTH OF THE VORTICITY MAX ARE CONTRIBUTING TO 30-40 KT DEEP
LAYER SHEAR SUPPORTIVE OF ORGANIZED STORM STRUCTURES WITHIN AN
UNSTABLE AIR MASS /MLCAPE TO 2500 J PER KG/. ACTIVITY IS EXPECTED
TO CONTINUE DEVELOPING SEWD WITH STRONGER CELLS CAPABLE OF PRODUCING
LARGE HAIL AND DAMAGING WIND GUSTS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28025.


...WEISS
Member Since: Posts: Comments:
1173. JLPR2
Quoting SLU:
Folks .. say hello to tropical storm "Barry". One-minute winds at NOAA 41014 buoy now up to 33kts and 35 - 40kt winds barbs with a closed LLC.


I'm laughing, cant help it. 92L... heh! XD
One never knows.

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1172. SLU
Quoting allancalderini:
Oh my maybe a special TWO?


The data is clear. If we are to go by the rules, this is a TS.
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1171. nigel20
Quoting TropicalAnalystwx13:
It's incredibly ironic 2010 also had a central Atlantic wave that may have qualified as a tropical cyclone dubbed 92L.

Yeah...i remember that one.
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Quoting aislinnpaps:


Hurricane Humberto was a minimal hurricane that formed and intensified faster than any other North Atlantic tropical cyclone on record before landfall. Within three hours of forming, the depression intensified into Tropical Storm Humberto. The National Hurricane Center reported that "no tropical cyclone in the historic record has ever reached this intensity at a faster rate near landfall." The path of the eye continued northeastward and passed over Port Arthur, Nederland, Port Neches, Groves, and Bridge City, Texas at Category 1 hurricane strength. This was the second time within two years (following Hurricane Rita on September 24, 2005) that these cities experienced a direct hit from a hurricane. By eight hours after landfall, Humberto weakened to a tropical storm as it crossed into southwestern Louisiana.[

I went to bed expecting to teach the next morning, only to find school cancelled due to Humberto. Luckily, nothing serious here.



Yup, and WU members were calling it, aching for classification. Remember it well.
Member Since: Posts: Comments:
Quoting Torito:


sup? the wave looks nice, even though nothing will come out of it. Probs the best wave i have ever seen this early in the season.


And that is with all the shear. Imagine what August will look like!
Member Since: Posts: Comments:
1168. JRRP
the buoy near the wave
35knots gusty winds
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Quoting moonlightcowboy:



I'll throw in two more, considering the plus comments. :) You five, send me an address in wumail and I'll get you a soda. :)

CybrTeddy
washingtonian115
TylerStanfield
allancalderini
ChillinInTheKeys


No thank you please it only makes me sneeze... Thanks anyway!!!



Looks like the rain's a comin' again. At least we got to see the sun for a couple of hours today. Been a very cloady week here.
Member Since: Posts: Comments:
Quoting DataNerd:
Despite inital appearance, appearances are deceiving.

Looking at RGB loop we see that the thunderstorms are being displaced to the east of the low by the shear:


Link

Much less so than Andrea's were when they designated it yesterday. ;)

I wish the NHC would use more consistency sometimes, even though this is rare case.
Member Since: Posts: Comments:
1165. will40
Quoting Tropicsweatherpr:
WAVE!!

BEGIN
NHC_ATCF
invest_al922013.invest
FSTDA
R
U
040
010
0000
201306061923
NONE
NOTIFY=ATRP
END
INVEST, AL, L, , , , , 92, 2013, DB, O, 2013060618, 9999999999, , , , , , METWATCH, , AL922013
AL, 92, 2013060618, , BEST, 0, 136N, 467W, 30, 0, DB, 0, , 0, 0, 0, 0,




yes saw that on the Navy site
Member Since: Posts: Comments:
Quoting allancalderini:
From being a horrible invest to almost a hurricane in just a day that is impressive imo.


Hurricane Humberto was a minimal hurricane that formed and intensified faster than any other North Atlantic tropical cyclone on record before landfall. Within three hours of forming, the depression intensified into Tropical Storm Humberto. The National Hurricane Center reported that "no tropical cyclone in the historic record has ever reached this intensity at a faster rate near landfall." The path of the eye continued northeastward and passed over Port Arthur, Nederland, Port Neches, Groves, and Bridge City, Texas at Category 1 hurricane strength. This was the second time within two years (following Hurricane Rita on September 24, 2005) that these cities experienced a direct hit from a hurricane. By eight hours after landfall, Humberto weakened to a tropical storm as it crossed into southwestern Louisiana.[

I went to bed expecting to teach the next morning, only to find school cancelled due to Humberto. Luckily, nothing serious here.
Member Since: Posts: Comments:
1163. Torito
Quoting PalmBeachWeather:
Ok Torito.Talk..You have my attention.


sup? the wave looks nice, even though nothing will come out of it. Probs the best wave i have ever seen this early in the season.
Member Since: April 30, 2013 Posts: 5 Comments: 4316
Quoting GeorgiaStormz:
nothing will become of 92L////

all models kill it


Even after it has survived strong wind shear for the past day or so??
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1161. junie1
Quoting SLU:
Folks .. say hello to tropical storm "Barry". One-minute winds at NOAA 41014 buoy now up to 33kts and 35 - 40kt winds barbs with a closed LLC.





NHC really dropped the ball on this one
Member Since: Posts: Comments:
Despite inital appearance, appearances are deceiving.

Looking at RGB loop we see that the thunderstorms are being displaced to the east of the low by the shear:


Link
Member Since: Posts: Comments:
Quoting SLU:
Folks .. say hello to tropical storm "Barry". One-minute winds at NOAA 41014 buoy now up to 33kts and 35 - 40kt winds barbs with a closed LLC.





Oh my maybe a special TWO?
Member Since: Posts: Comments:
Quoting GeorgiaStormz:
nothing will become of 92L////

all models kill it
Even though its likely it will be killed never be to sure never say never,the same happen to Andrea many thought it would not develop and here she is as a strong ts.
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Quoting Torito:


that wave deserves talk, as it survived this long already in massive amounts of shear.
Ok Torito.Talk..You have my attention.
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1156. Thrawst
Greetings from Sunny Isles Beach, Florida!
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Quoting moonlightcowboy:



You're right, and it was three cokes, one each for three folks! :) Good memory. You're the first one that has mentioned it, so yeah, send me an address in wumail and I'll get you a soda! :) I've already had mine to choke down the crow. ;P





I'll throw in two more, considering the plus comments. :) You five, send me an address in wumail and I'll get you a soda. :)

CybrTeddy
washingtonian115
TylerStanfield
allancalderini
ChillinInTheKeys
Member Since: Posts: Comments:
Member Since: Posts: Comments:
1153. Torito
Quoting hurricanes2018:
tropical wave everyone is talking about


that wave deserves talk, as it survived this long already in massive amounts of shear.
Member Since: April 30, 2013 Posts: 5 Comments: 4316
1152. SLU
Quoting Tropicsweatherpr:
WAVE!!

BEGIN
NHC_ATCF
invest_al922013.invest
FSTDA
R
U
040
010
0000
201306061923
NONE
NOTIFY=ATRP
END
INVEST, AL, L, , , , , 92, 2013, DB, O, 2013060618, 9999999999, , , , , , METWATCH, , AL922013
AL, 92, 2013060618, , BEST, 0, 136N, 467W, 30, 0, DB, 0, , 0, 0, 0, 0,



Thank goodness.
Member Since: Posts: Comments:
1151. nigel20
Quoting washingtonian115:
The wave in the Atlantic wants to have a name to.I think it was in 2010 that some invest went from a 0% chance to a 60% chance..it was impacting the gulf coast....

Hey wash!
I guess that it was given near 0% due to the 40 to 50 knots of shear ahead of it.
Member Since: Posts: Comments:
Quoting sar2401:
Hey, I'm just a crow-eating bum, so what I know, but look at the Regional Radar for the Southeast. It really looks like Andrea is trying to move at least north if not northwest to me.


Whatever north or NW movement there is, won't last for long, as the trough will pick it up soon.
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Eh, not ironic, coincidental.
Member Since: Posts: Comments:
1148. SLU
Folks .. say hello to tropical storm "Barry". One-minute winds at NOAA 41014 buoy now up to 33kts and 35 - 40kt winds barbs with a closed LLC.





Member Since: Posts: Comments:
Quoting Torito:
ITS RAINING HERE!!!! :D
No way
Member Since: Posts: Comments:
Quoting TropicalAnalystwx13:
It's incredibly ironic 2010 also had a central Atlantic wave that may have qualified as a tropical cyclone dubbed 92L.


ummmm, how so?

Lots of 92Ls may have that honor.....and will in the future too..
Member Since: Posts: Comments:
1145. GoWVU
What does it look like for the Charleston area tonight?
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New invest.
Member Since: Posts: Comments:
nothing will become of 92L////

all models kill it
Member Since: Posts: Comments:
Quoting allancalderini:
From being a horrible invest to almost a hurricane in just a day that is impressive imo.


A sign of things to come.
Member Since: Posts: Comments:
It's incredibly ironic 2010 also had a central Atlantic wave that may have qualified as a tropical cyclone dubbed 92L.
Member Since: Posts: Comments:
1140. Torito
ITS RAINING HERE!!!! :D
Member Since: April 30, 2013 Posts: 5 Comments: 4316
kinda off interesting!
Member Since: Posts: Comments:
1138. barbamz

Time for my favourite link again. Welcome invest, but don't do any damage!
Member Since: Posts: Comments:
1137. K8eCane

TROPICAL STORM ANDREA
~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: NON-NAM COMPROMISE BY DEFAULT
CONFIDENCE: AVERAGE

ANDREA IS EXPECTED TO MOVE INTO A CONFLUENT FLOW PATTERN BETWEEN A
WEAKENING UPPER TROUGH MOVING THROUGH SOUTHEAST CANADA AND THE
AZORES-BERMUDA HIGH -- SUBTROPICAL RIDGE -- WHOSE AXIS EXTENDS
ACROSS THE BERMUDA TRIANGLE. THIS SHOULD ALLOW THE SYSTEM TO
ACCELERATE IN BETWEEN THE TWO SYSTEMS. A NON-NAM COMPROMISE IS
REASONABLY CLOSE TO THE 15Z NATIONAL HURRICANE CENTER -- NHC --
PRODUCT SUITE FOR THE CYCLONE, WHICH IS IMPRESSIVE CONSIDERING ITS
INCREASINGLY RAPID PROGRESSION. SEE THE LATEST NHC ADVISORIES AND
DISCUSSIONS FOR THE LATEST INFORMATION ON THIS SYSTEM.


FROM HPC 245 MODEL DISCUSSION...Bermuda triangle? Are they telling us she will disappear?
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CATL shear current 850-500:

1.

CATL shear 48 hrs 850-500:

2.



CATL shear 850-200 current:

1.


48 hrs

2.


Still lots of early spring/wintertime upper level patterns lingering out there.
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Quoting FLWaterFront:
It's in Floridal, at the southern tip of the Pinellas peninsula, near St. Pete.
Yes, Floridal... Just south of Georgiadal
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Member Since: Posts: Comments:
Quoting sar2401:

Really? We have spammers and trolls here? I'm shocked, shocked, I tells you. :-)


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1132. Patrap
Member Since: July 3, 2005 Posts: 426 Comments: 128628
From being a horrible invest to almost a hurricane in just a day that is impressive imo.
Member Since: Posts: Comments:
I see what Washintonian is talking about with 'Barry'. Check out the long-range GFS, around June 20.
Member Since: Posts: Comments:
WAVE!!

BEGIN
NHC_ATCF
invest_al922013.invest
FSTDA
R
U
040
010
0000
201306061923
NONE
NOTIFY=ATRP
END
INVEST, AL, L, , , , , 92, 2013, DB, O, 2013060618, 9999999999, , , , , , METWATCH, , AL922013
AL, 92, 2013060618, , BEST, 0, 136N, 467W, 30, 0, DB, 0, , 0, 0, 0, 0,

Member Since: Posts: Comments:
1127. Patrap

894
WUUS54 KJAN 061927
SVRJAN
MSC061-129-062000-
/O.NEW.KJAN.SV.W.0289.130606T1927Z-130606T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
227 PM CDT THU JUN 6 2013

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
EXTREME EAST CENTRAL SMITH COUNTY IN CENTRAL MISSISSIPPI...
CENTRAL JASPER COUNTY IN EAST CENTRAL MISSISSIPPI...

* UNTIL 300 PM CDT

* AT 226 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
TURNERVILLE MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL CENTRAL JASPER COUNTY AT 240 PM CDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WINDS OF 60 MPH CAN BRING DOWN TREES...POSSIBLY RESULTING IN INJURY
AND PROPERTY DAMAGE. ROOFS OF MOBILE HOMES AND OUTBUILDINGS COULD BE
DAMAGED...AND MINOR ROOF DAMAGE TO WELL BUILT HOMES AND STRUCTURES
COULD OCCUR.



LAT...LON 3197 8906 3185 8921 3197 8936 3208 8923
TIME...MOT...LOC 1926Z 313DEG 11KT 3197 8921



DC
Member Since: July 3, 2005 Posts: 426 Comments: 128628
Very impressive

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I'd venture off to say this would be a tropical depression if we were later in the season.

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Quoting bigwes6844:
what part u in?


Fort Walton Beach and Destin area.
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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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