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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Yeah, Wash - the Bermuda high worries me this year. I hope it isn't 'set' for the season. A long track cape verde storm could be disastrous.
Member Since: March 10, 2006 Posts: 0 Comments: 10660
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Quoting Dakster:
Is this a harbinger of things to come for Florida this year?
The Bermuda high is in a rather nasty place this year..So if it doesn't change all that mush..watch out below!!.It could be a harbinger of a healthy caribbean season as that is where Andrea originated from..
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Quoting AztecCe:
I see the cone has shifted to the west. Is there a chance of isolated tornadoes is eastern NC?
Yes.
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Quoting FunnelVortex:
Wasn't there this one year where Florida was hit one storm after another?


No, two years in a row -- 2004 and 2005.
Member Since: March 10, 2006 Posts: 0 Comments: 10660
Quoting DataNerd:



Easily able to see the eye structure forming on this radar image and the spin around it increasing as the loop goes on.

Whats more is it looks like a fairly tight structure so we may end up with a hurricane after all. Which is really bad for Tampa.

Whats worse for tampa is this apparent shift to due east motion.
its not going due east its ene landfall will occur somewhere between north of tampa south of cross city south
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Quoting aislinnpaps:


My part of Louisiana has just been getting the rain and thunder, but hopefully we won't have the tornados Florida is getting.


You are on the 'clean' side of the storm, so your chances should be lower.
Member Since: March 10, 2006 Posts: 0 Comments: 10660
It coming!
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Quoting flcanes:

I guess we have learned that even Tropical storms can cause havoc, just because their not named "hurricanes" doesnt mean you shouldnt pay attention to them


*cough* Allison *cough*
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Quoting Skyepony:

That over TX had some tornado signatures lastnight.
I noticed that mean-looking MCS riding the Red River early this morning too. Wonder if it will interact with Andrea?
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Wasn't there this one year where Florida was hit one storm after another?
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I can hear the Freight train rumbling off in the distance, toward Gulfport. It is bad here on Coquina Key
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Quoting HurrikanEB:
Kind *looks* like Andrea has a twin over Texas.



(Obviously they're completely different structures. . . just noting that their physical appearance is amusingly similar.)


My part of Louisiana has just been getting the rain and thunder, but hopefully we won't have the tornados Florida is getting.
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Quoting GTcooliebai:
You must want everyone in the blog to have another helping of crow. :D
I guess Andrea will have a lasting impression on us that Tropical weather isn't a exact science..And the storm that fed the entire blog crow..
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Is this a harbinger of things to come for Florida this year?
Member Since: March 10, 2006 Posts: 0 Comments: 10660
She looks a lot like Earl of 1998
I was so surprised this morning if we keep getting storms as defiant as Andrea we will be eating a lot of crow.
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ironic part is that this could be one of the most numerous tornado outbreaks so far this year
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Quoting GTcooliebai:
You must want everyone in the blog to have another helping of crow. :D
 

Probably tastes like Humble Pie.

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Quoting GeorgiaStormz:
So is this going to conitnue to baroclinically strengthen inland? CMC says so...
Some models show max precip. on the N and W side across N/S Carolina. This would fall inline with the transition, though surface wind field should not be an issue by then.
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Quoting floridastorm:
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?
The NHC called for a turn to the NE, looks to be jogging more ENE for now. We will see if the NHC adjusts in the upcoming update. Easy to track now on Tampa radar for all to see, although have to take radar angle into account.
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153. Skyepony (Mod)
Quoting HurrikanEB:
Kind *looks* like Andrea has a twin over Texas.



(Obviously they're completely different structures. . . just noting that their physical appearance is amusingly similar.)

That over TX had some tornado signatures lastnight.
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Quoting washingtonian115:
Local met thinks Andrea has the potential to intensify into a minimal hurricane before running up the coast towards us.
You must want everyone in the blog to have another helping of crow. :D
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Quoting FunnelVortex:


The hurricane buffs in Florida are sure in for some excitement.
Poor Florida..something bad is always happening..and Andrea looks to keep it that way..
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Quoting DataNerd:



Easily able to see the eye structure forming on this radar image and the spin around it increasing as the loop goes on.

Whats more is it looks like a fairly tight structure so we may end up with a hurricane after all. Which is really bad for Tampa.

Whats worse for tampa is this apparent shift to due east motion.

This might be really bad.....
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Quoting washingtonian115:
Local met thinks Andrea has the potential to intensify into a minimal hurricane before running up the coast towards us.

It depends on three factors.
1. How fast it moves overland
2. Whether or not this stays overland
3. If it will not go extra tropical immediately
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Quoting KEEPEROFTHEGATE:
thanks for update doc




Easily able to see the eye structure forming on this radar image and the spin around it increasing as the loop goes on.

Whats more is it looks like a fairly tight structure so we may end up with a hurricane after all. Which is really bad for Tampa.

Whats worse for tampa is this apparent shift to due east motion.
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147. Skyepony (Mod)
Quoting FunnelVortex:


I can't read that...

Quoting Autistic2:


What does that mean?

It's time you guys read the book...Read it!

Here's a strongly worded video (I admit there is a little cursing) to encourage you..Read it! READ THE BOOK!
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Kinda *looks* like Andrea has a twin over Texas.



(Obviously they're completely different structures. . . just noting that their physical appearance is amusingly similar.)
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Quoting LargoFl:
is jedkins still around, both of us are in the path of this tornado unless it dies out..oh oh


I hope you have somewhere to go, Largo. We don't here in Louisiana, no basements. Stay safe!
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wind velocities are around 80 mph on radar, although that is up about 12000 feet
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This is like a mini but tropical superstorm of 93.....its got the loook
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Looks like the storm, if its east track holds up, will make landfall just north of Tampa, which is a worst case scenario for Storm surge in that area. Granted the surge from this storm isn't going to be all that impressive, but it's worth noting.
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Quoting washingtonian115:
Local met thinks Andrea has the potential to intensify into a minimal hurricane before running up the coast towards us.


The hurricane buffs in Florida are sure in for some excitement.
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Picture of Tornado in West Palm Beach?



Credit to WPTV
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She's well south an east of the forecast line. Strong squall line getting ready to come in here, and all along the West Coast....
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Very bizzare way to try and form an eyewall. I guess one can't be picky.
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Quoting GeorgiaStormz:
So is this going to conitnue to baroclinically strengthen inland? CMC says so...
GFS was saying no...That does not mean it wont.
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Quoting hydrus:
This would have been bad track for Tampa also 1990 Marco..

I guess we have learned that even Tropical storms can cause havoc, just because their not named "hurricanes" doesnt mean you shouldnt pay attention to them
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Local met thinks Andrea has the potential to intensify into a minimal hurricane before running up the coast towards us.
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is jedkins still around, both of us are in the path of this tornado unless it dies out..oh oh
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More pictures of Damage out of West Palm Beach:








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I see the cone has shifted to the west. Is there a chance of isolated tornadoes is eastern NC?
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thanks for update doc

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This would have been bad track for Tampa also 1990 Marco..
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So is this going to conitnue to baroclinically strengthen inland? CMC says so...
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Good Morning Peeps, See you got your Storm, Stay Safe All,
Gloomy here again this morning, 59.2 right now. Forecast 85F.
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Bradenton Beach


Downtown Tampa

More cams
Member Since: October 25, 2008 Posts: 62 Comments: 6532
If your near pinellas park take cover!
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SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1007 AM EDT THU JUN 6 2013

FLC103-061430-
/O.CON.KTBW.TO.W.0010.000000T0000Z-130606T1430Z/
PINELLAS FL-
1007 AM EDT THU JUN 6 2013

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 AM EDT FOR CENTRAL
PINELLAS COUNTY...

AT 1006 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO. LOCATED NEAR LEALMAN...OR NEAR PINELLAS
PARK...MOVING NORTH AT 30 MPH.

THE TORNADO WILL BE NEAR...
KENNETH CITY.
LEALMAN.
LARGO.
SAINT PETE CLEARWATER AIRPORT.
CLEARWATER.
SAFETY HARBOR.

THIS INCLUDES INTERSTATE 275 BETWEEN EXITS 18 AND 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THE TORNADO GO TO A SMALL INTERIOR ROOM IN
A STRONG AND WELL CONSTRUCTED BUILDING. CARS AND MOBILE HOMES ARE NOT
SAFE. IF NO SHELTER IS AVAILABLE...LIE FLAT IN A DITCH OR CULVERT AND
COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT THURSDAY MORNING
FOR SOUTHWESTERN FLORIDA.

&&
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Rotation over Pinellas Park now.
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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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