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 FIUStormChaser:
If you are in South Florida, watch out for developing Supercells with embedded tornados forming in between the two large bands:


I am just curious are these anywhere around Boynton beach right now?
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This is a worst case track for Tampa if this was a major cane. Even still Tampa can expect a significant storm surge now that the center appears to be coming that way.

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wow nice eyewall...reminds me of beryl but on the other side.
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4.56 inches of rain here in Orlando, just north of the airport, overcast with light wind.

Seems to be moving just north of due east on the radar, heading for clearwater beach?
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Quoting StormTrackerScott:


It's all in fun brother. A deep fried crow actually sound pretty good.
What did you do that you have to eat so much crow
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Eggmont Key..Station EGKF1
COMPS (University of South Florida)
Location: 27.601N 82.76W
Date: Thu, 06 Jun 2013 11:54:00 UTC
Winds: SE (140°) at 20.0 kt gusting to 26.0 kt
Atmospheric Pressure: 29.73 in
Air Temperature: 76.5 F
Tide: 3.08 ft (above MLLW)
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trees are swaying now with these strong gusts and rain is really coming down.
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If you are in South Florida, watch out for developing Supercells with embedded tornados forming in between the two large bands:

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66. Skyepony (Mod)
This is static & won't change..Nexsat
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Quoting Autistic2:


What does that mean?


Satellite intensity estimates, also means we've shifted from a sheared type cyclone to a curved-band type cyclone.
Member Since: July 8, 2005 Posts: 259 Comments: 24134
Thank you Dr. Masters.... Andrea sure showed her stuff here in Palm Beach county this morning.Just goes to show a storm so far away can create big problems from the feeder bands...
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Quoting StormTrackerScott:
Tampa should begin to see the winds really start to ramp up over the coming hour or 2.



I live in Hernando County but work in Tampa. Not to windy here in Tampa yet, some gusts up to 30mph but conditions are going down hill at a steady pace.
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The two biggest changes in watching is the strength of the storm and the direction. It appears to be moving more towards the east which create more problems for the peninsula of Florida. The other factor is the strength. Will it become our first hurricane? And will the come shift south and east? Opinions?
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Quoting GeorgiaStormz:
I'd like my crow deep fried....with ketchup.

Btw I wasnt expecting such developent overnight...wow...almost looks like a hurricane lol

and this is one dreary storm....even under the high clouds only


It's all in fun brother. A deep fried crow actually sound pretty good.
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Quoting CybrTeddy:
Andrea has about 9-10 hours left over water if the models are correct.

If it is already a 70 MPH ts as winds suggest, we would just need to see thunderstorms to wrap around the center and then we would have hurricane Andrea
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Station 42036
NDBC
Location: 28.500N 84.517W
Date: Thu, 06 Jun 2013 12:50:00 UTC
Winds: E (90°) at 29.1 kt gusting to 36.9 kt
Significant Wave Height: 11.2 ft
Dominant Wave Period: 7 sec
Mean Wave Direction: ESE (107°)
Atmospheric Pressure: 29.57 in and falling
Air Temperature: 75.4 F
Dew Point: 73.2 F
Water Temperature: 77.0 F
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Quoting Stoopid1:


Basically showing the structure improvement and strengthening, raw data from a satellite. T#(intensity measurement by satellite) increased to reflect that. Curved band means there's a long tail feature if you will, the band offshre of SFL is what it's referencing.


Oops, meant to edit previous post. Sorry.
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post 54 thank you
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Tampa should begin to see the winds really start to ramp up over the coming hour or 2.
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Quoting StormTrackerScott:


A met here in Orlando just said a bouy near the center of Andrea had a 72 mph wind gust. Very likely a 70 mph TS right now.


Hmm. This may actually stand a chance of becoming a hurricane.
And to think 12 hours ago so many people thought it would not even develop.
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Quoting Autistic2:


What does that mean?


Basically showing the structure improvement and strengthening, raw data from a satellite. T#(intensity measurement by satellite) increased to reflect that.
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Andrea has about 9-10 hours left over water if the models are correct.
Member Since: July 8, 2005 Posts: 259 Comments: 24134
Morphed Integrated Microwave Imagery at CIMSS (MIMIC)

24HRS OF Andrea/91L

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Quoting GeorgiaStormz:
I'd like my crow deep fried....with ketchup.

Btw I wasnt expecting such developent overnight...wow...almost looks like a hurricane lol

and this is one dreary storm....even under the high clouds only

You be safe tonight, this storm and its rain might be headed your way
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Quoting rmbjoe1954:


Are you for real? Florida , or any other state for that matter, does not need a hurricane. Hopefully dry air will defuse that potential.

Andrea appears to be moving more easterly. I wonder if the models will bring the storm through northern /central florida than out to sea hugging the coast.


Concur. While I welcome the rain so the aquifer can be replenished, I'd prefer to not see loss of life and damage to property. People have enough hardships in life without "wishing" for more.
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Quoting Autistic2:
Radar looks like it is still getting better organized and stronger. Why no HH?


A met here in Orlando just said a bouy near the center of Andrea had a 72 mph wind gust. Very likely a 70 mph TS right now.

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Looks like landfall will be between Hernando County north to Levy County. JMO.... We shall see!
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I'd like my crow deep fried....with ketchup.

Btw I wasnt expecting such developent overnight...wow...almost looks like a hurricane lol

and this is one dreary storm....even under the high clouds only
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Quoting FunnelVortex:


I can't read that...

Me neither
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Thanks Doc!!
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Quoting Skyepony:
Scene is a curved band now. T# ↑ 2.8


What does that mean?
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Quoting Skyepony:
Scene is a curved band now. T# ↑ 2.8


I can't read that...
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Quoting LargoFl:
so some places got almost 5 inches of rain already and more coming gee

This presents a major flooding situation.
I hope that this will be the last storm florida will have to go through, but without a major hurricane in almost 8 years its bound to happen
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Thanks Doc.
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Quoting Autistic2:
Radar looks like it is still getting better organized and stronger. Why no HH?


Plus you can clearly see the pronounced Jog East:
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The Center of Andrea is now coming into Tampa Bay radar range.

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37. Skyepony (Mod)
Scene is a curved band now. T# ↑ 2.8
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Quoting rmbjoe1954:


Are you for real? Florida , or any other state for that matter, does not need a hurricane. Hopefully dry air will defuse that potential.

Andrea appears to be moving more easterly. I wonder if the models will bring the storm through northern /central florida than out to sea hugging the coast.

Exactly. This is why the heavy rains of may filled up the ground. Now there is no room for more than 1-2 inches per every 3 hours
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so some places got almost 5 inches of rain already and more coming gee
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Quoting weatherh98:
If only she had more time


Yeah...
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...24 HOUR HIGHS/LOWS/PRECIPITATION...

PCPN HIGH LOW

ARCHBOLD :ACHF1 2.51 84 74
CHIEFLAND 5SE :CHIF1 0.98 86 72
FORT MYERS/SW INT APT :RSW 2.30 81 77
INVERNESS 3SE :INVF1 2.34 75 67
PLANT CITY :PLCF1 3.60 87 71
PUNTA GORDA :PGD 0.48 MSG MSG
RUSKIN :TBW 4.29 78 75
SARASOTA/BRADENTON APT :SRQ 2.55 81 78
ST LEO :STLF1 3.20 80 70
ST PETE/ALBERT WHITTED :SPG 4.91 83 77
ST PETE/CLEARWATER APT :PIE 3.07 81 76
TAMPA INTERNATIONAL APT :TPA 4.18 79 76
VENICE :VNCF1 2.31 81 74

DATA FOR LLDF1, STLF1, CHIF1, LWLF1, BROF1, AND PLCF1 ARE
24 HOUR MAX/MIN AND PRECIP FROM 4 PM TO 4 PM.


LOCATION PCPN
LEVY COUNTY
SUWANNEE 6NE :SWNF1 3.64

PASCO COUNTY
SAN ANTONIO 3S :SNTF1 5.87

PINELLAS COUNTY
CLEARWATER :ALLF1 2.73
DUNEDIN :CCKF1 4.19
DUNEDIN 1SE :CRCF1 3.29
PINELLAS PARK :SJOF1 3.87
PINELLAS PARK :PNBF1 2.06
TARPON SPRINGS 5E :TSPF1 4.25

HILLSBOROUGH COUNTY
ANTIOCH :BKRF1 6.12
BRANDON 2E :BRDF1 4.98
LITHIA :LITF1 5.20
TAMPA/MACDILL AFB :MCF 5.13
OLDSMAR 3NE :OLDF1 1.97
TAMPA/DELANEY CREEK :DLYF1 5.55
TAMPA/DELANEY CREEK :DLNF1 6.90
TAMPA/PROGRESS BLVD :NACF1 6.70
TAMPA 8NW/SWEETWATER :SCKF1 4.34
TAMPA DAM :TMTF1 5.03
THONOTOSASSA 3N :MORF1 8.55
WIMAUMA 6NW :WMMF1 4.61
WIMAUMA 4SW :WIMF1 4.42

POLK COUNTY
BARTOW :BARF1 4.65
FORT MEADE :FTMF1 4.53
LAKELAND 3E :SDLF1 6.26
LAKELAND 3NE :LPOF1 4.92

MANATEE COUNTY
BRADENTON 11ENE :RYEF1 3.75
EDGEVILLE :EDGF1 3.17
LAKE WARD/BRADENTON 5SE :LWDF1 2.93
MYAKKA CITY :MKAF1 2.94
MYAKKA HEAD 8W :MKHF1 2.14
VERNA 7NNE :BTHF1 2.80

SARASOTA COUNTY
BIG SLOUGH CANAL :BIGF1 0.00
MYAKKA STATE PARK :MKCF1 1.46
NORTH PORT :NPRF1 1.20
NORTH PORT 2N :NPOF1 2.06
SARASOTA 5E :SRAF1 2.59
SARASOTA 16SE :SARF1 1.73

HARDEE COUNTY
BOWLING GREEN 1S :PAYF1 4.78
GARDNER 2N :GDRF1 3.84
GARDNER 1S :MRSF1 3.98
MYAKKA HEAD 4NE :HORF1 3.60

DESOTO COUNTY
FORT OGDEN 11E :FOGF1 1.17
NOCATEE :NOCF1 1.21

HIGHLANDS COUNTY
BRIGHTON 7NW :IDPF1 0.39
BRIGHTON 6NW :IDRF1 0.43
BRIGHTON 7E :SKRF1 0.58
LAKE PLACID 7NE :LISF1 0.41

CHARLOTTE COUNTY
PUNTA GORDA 8NE :PUNF1 1.36

LEE COUNTY
BUCKINGHAM :OLGF1 1.95
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Quoting weatherh98:
If only she had more time


Are you for real? Florida , or any other state for that matter, does not need a hurricane. Hopefully dry air will defuse that potential.

Andrea appears to be moving more easterly. I wonder if the models will bring the storm through northern /central florida than out to sea hugging the coast.
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Radar looks like it is still getting better organized and stronger. Why no HH?
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Wow...what a night/morning last night here in Palm Beach county. Felt like we had a tornado warning every hour. Looks like some damage in the western part of the county. Woulda been nicer if it coulda waited until AFTER the last day of school for the kids though.

I'm wondering if we are done with Andrea induced rains down here. Thoughts?
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Quoting flcanes:

Well, technically Andrea is part of the remnants of 90l, which in turn is the remnants of hurricane Barbara.


Barbara lowered the pressures across the region which may have helped the low to form.
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Rain coming down hard, lights flickering and the real part of the storm hasn't hit yet. But I'm in Louisiana, so hopefully it'll be shorter duration than you guys in Florida.
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Quoting FIUStormChaser:
Pictures of Tornado Damage out of Palm Beach County from News Channel Five (WPTV):


img src="http://media2.wptv.com//photo/2013/06/06/phot o2_20130606084820_640_480.JPG






Wow. In between the feeder bands, I have been getting some sunshine which will only make the tornado situation worse
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Quoting AussieStorm:
2 Invests
1 Tropical Storm
0 Hurricanes
0 Major Hurricanes

Well, technically Andrea is part of the remnants of 90l, which in turn is the remnants of hurricane Barbara.
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Pictures of Tornado Damage out of Palm Beach County from News Channel Five (WPTV):


img src="http://media2.wptv.com//photo/2013/06/06/phot o2_20130606084820_640_480.JPG





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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.