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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Quoting Tropicsweatherpr:
Very impressive for being early June.



Looks better than Jose ;)
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Quoting sar2401:

Which state is this Gulfport in?
It's in Floridal, at the southern tip of the Pinellas peninsula, near St. Pete.
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Quoting Skyepony:
Recon is finding 40.0 knots (~ 46.0 mph)
Tropical Storm winds at the surface just offshore of Tampa.


At the office in Oldsmar it seems like we're just now feeling our strongest winds even though the rain is gone.
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Quoting CybrTeddy:


65mph it is then, I wish we had recon in at around 10 this morning, it's possible they could have found a near hurricane.
70mph or even 75mph would have been possible when Anddrea look her best.
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Already transitioning to extratropical. Nonethless the threats with this storm remain, particularly tornados, and lots of them, for at least another 15 hours or so as well as the rain.

Landfall should be occurring within the hour.
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1069. sar2401
Quoting Patrap:


A possible tornado knocked a tree onto Yummy's in Gulfport during Tropical Storm Andrea. (Photo: David Ochoa, staff)


Which state is this Gulfport in?
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Quoting xcool:
12zzzz GFS Tropical Storm Barry to the N. Gulf Coast
The GFS did show tropical development 10 days out.Can you post the frame?.Maybe June has other plans..
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1066. sar2401
Quoting scottsvb:


There have been hurricanes in the past with a exposed LLC due to dry air. Also very weak hurricanes usually have only isolated 75mph winds but enough to them classify it as a hurricane. All they need is more than 1 location of 75mph winds for more than 30 seconds :)

I thought it had to be a one minute wind to qualify?
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1. Andrea innner core structure looks to have decayed significantly despite a slight wind increase, since earlier today. Going to make landfall as a strong TS and not much more, not sure honestly what will be left of it after crossing land, possibly not much.


2. CATL wave was looking good yesterday but ran head on into 20kts of shear today and probably won't be able to do much as a result, so I would expect that to dissipate.


Our next "threat" for a cyclone will likely come from what GFS and Navgem says will be an extremely vigorous wave moving off of africa in the next couple of days.
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1064. Skyepony (Mod)
Recon is finding 40.0 knots (~ 46.0 mph)
Tropical Storm winds at the surface just offshore of Tampa.
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1062. Patrap


A possible tornado knocked a tree onto Yummy's in Gulfport during Tropical Storm Andrea. (Photo: David Ochoa, staff)

Member Since: July 3, 2005 Posts: 423 Comments: 127874
1061. vis0
Quoting Tazmanian:
how many raders to we neeed to have on this blog pages i see 7 raders of all most the same thing on one pages a lone and there mosting showing the same thing

We need 2   for those overnight formations
SERIOUS SIDE: PLEASE stay tuned to your weather radio for flood updates

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1060. xcool
taco2me61 no lol
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1059. barbamz
Quoting Skyepony:


Those cells today, got so lucky~ one I was on the east edge of. The other got Palm Bay & Melbourne. They kinda blew up as they hit water. Had 20mph gust. That 10 years ago blew the front door in on the house..

Here's a pic of that today from my backyard in Melbourne.



Well done, Skye! Dr. M. should use it in his next entry.
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1058. xcool
sar2401 ?
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1057. Skyepony (Mod)
Recon is totally buzzing the Tampa coast line..
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Quoting xcool:
12zzzz GFS Tropical Storm Barry to the N. Gulf Coast
Do we really have to say this "Now"

Taco ;o)
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1054. sar2401
Quoting xcool:
12zzzz GFS Tropical Storm Barry to the N. Gulf Coast

Umm...Ok...what?
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1053. barbamz
Quoting yonzabam:


Seeing that pic, it's hard to believe they've managed to survive for 250 million years.


Cars weren't invented then ... :)
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Yes,there was Tropical Storm Arlene in 2005,and Tropical Storm Andrea this year.
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Quoting Neapolitan:
AL, 01, 2013060618, , BEST, 0, 289N, 839W, 55, 993, TS, 50, NEQ, 30, 30, 0, 0, 1008, 150, 20, 0, 0, L, 0, , 0, 0, ANDREA, M,


65mph it is then, I wish we had recon in at around 10 this morning, it's possible they could have found a near hurricane.
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Quoting hurricanes2018:
Very impressive tropical wave is going to be a tropical low soon if it keep ts t.storms in the center that 0% will go up very fast!

it does have a tropical low with it
Member Since: June 13, 2009 Posts: 2 Comments: 11843
Tropical Storm Andrea
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1048. sar2401
Quoting barbamz:

A large alligator was caught trying to cross the road at 16th Street and 102nd Avenue in St. Petersburg during Tropical Storm Andrea. (Photo: Brian Silvestro, viewer)

Woah, I would freak out!

LOL. I live in Eufaula, Alabama, near a very large lake (also called Lake Eufaula), and that thing is filled with alligators. The population has probably grown by five times in the last 20 years, and the state now allows alligator harvesting to keep the numbers in check. Every couple of weeks, one of those big boys will get out of the lake and decide to take a stroll through downtown. The local police and animal control have gotten really good at alligator wrangling. :-)
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1047. xcool
12zzzz GFS Tropical Storm Barry to the N. Gulf Coast
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1046. Skyepony (Mod)
Quoting islander101010:
central florida as soon as reported tornados vanish heck of a lot better than that el nino february tornado outbreak about 10 yrs ago


Those cells today, got so lucky~ one I was on the east edge of. The other got Palm Bay & Melbourne. They kinda blew up as they hit water. Had 20mph gust. That 10 years ago blew the front door in on the house..

Here's a pic of that today from my backyard in Melbourne.

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Quoting barbamz:

A large alligator was caught trying to cross the road at 16th Street and 102nd Avenue in St. Petersburg during Tropical Storm Andrea. (Photo: Brian Silvestro, viewer)

Woah, I would freak out!


Seeing that pic, it's hard to believe they've managed to survive for 250 million years.
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1043. Patrap
Member Since: July 3, 2005 Posts: 423 Comments: 127874
1042. nigel20
Quoting JLPR2:


Yep, I don't have a good feeling about this year, just hoping the feeling turns out to be nothing.

Agreed.
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http://www.wunderground.com/blog/WunderGirl12/comme nt.html?entrynum=18#commenttop
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730 WUUS54 KJAN 061845 SVRJAN MSC065-077-061930- /O.NEW.KJAN.SV.W.0285.130606T1845Z-130606T1930Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE JACKSON MS 145 PM CDT THU JUN 6 2013 THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN JEFFERSON DAVIS COUNTY IN SOUTH CENTRAL MISSISSIPPI... NORTHEASTERN LAWRENCE COUNTY IN SOUTH CENTRAL MISSISSIPPI... * UNTIL 230 PM CDT * AT 145 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 OMA MOVING SOUTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HEBRON BY 155 PM CDT... PRENTISS BY 225 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 3152 8997 3172 9020 3174 9018 3175 9012 3177 8988 3163 8975 TIME...MOT...LOC 1845Z 316DEG 19KT 3173 9006 -------------------------------------------------- ------------------------------ GRG
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1039. K8eCane
Quoting barbamz:


Woah, I would freak out!



WOW!
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1038. sar2401
Quoting cg2916:
NWS Tallahassee, FL Radar

Is it just me or did the center just jump west a little?

I have no idea, since that radar presentation is way too poor to make any judgements. What I will say is that the low appears to be tryng to reform to the west, over the Panhandle and SE Alabama. I'm starting to wonder if Andrea is really going to take off for the NE quite as fast as the models show.
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1037. barbamz
Quoting Patrap:


www.baynews9.com


A large alligator was caught trying to cross the road at 16th Street and 102nd Avenue in St. Petersburg during Tropical Storm Andrea. (Photo: Brian Silvestro, viewer)

Woah, I would freak out!
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Quoting Skyepony:
Fresh OSCAT of that in the Central Atlantic.


Definitely Interesting little Wave.
Member Since: June 2, 2013 Posts: 8 Comments: 1268
Very impressive tropical wave is going to be a tropical low soon if it keep ts t.storms in the center that 0% will go up very fast!
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1034. Patrap



www.baynews9.com

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1033. nigel20
Quoting Tropicsweatherpr:


Not a good sign for those of us who live in Hurricane alley.

The Caribbean is very vulnerable...especially due to our higher levels of debt and poor infrastructure.
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1032. Skyepony (Mod)
Fresh OSCAT of that in the Central Atlantic.

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Quoting Gearsts:
You guys thing the MDR will respond to this and warm?

Most likely
Member Since: June 2, 2013 Posts: 8 Comments: 1268
1030. barbamz
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1029. JLPR2
Quoting Gearsts:
LOL i remember you saying the same thing last year ;)


Ha! XD
We did have some close misses but nothing memorable. Hoping this year doesn't go beyond that, or decides to break our hurricane drought.
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1028. sar2401
Quoting HurricaneHunterJoe:
Is Andrea a sub tropical storm now? or in the process.....her pressure drops indicate that? she looks like in on satellite presentation?

Not yet. She still is fully tropical and maintaining TS circulation. The NHC is still calling for her to remain a TS for at least the next 36 hours. She has been a really confounding storm so far.
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1027. Gearsts
You guys thing the MDR will respond to this and warm?
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1026. cg2916
NWS Tallahassee, FL Radar

Is it just me or did the center just jump west a little?
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1025. JNTenne
Cancun cleared up nice!


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central florida as soon as reported tornados vanish heck of a lot better than that el nino february tornado outbreak about 10 yrs ago
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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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