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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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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Quoting 7daysnopowerfrancis:
With that clear patch between the bands, will the potential appearance of the sun allow for stronger storms or does it not matter when it is tropical of nature? Please don't shoot the messenger. I am 9 year veteran who mostly lurks on this site.

yes, the sun will help to produce stronger storms and more of a tornado threat if you're talking about the west coast...

I think she is cutting off the flow of dry air though by wrapping around moist air from the east side of the system.
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8AM
Member Since: May 23, 2012 Posts: 0 Comments: 4984
Quoting Civicane49:
Thanks, Dr. Masters.

Good night all.



I'll leave you with my earlier blog entry on Andrea.
Looking at this stilled image it starts to look like a eyeis forming but will have to see if the next hr will confirm it
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If only she had more time
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Quoting CybrTeddy:


Not quite, no update from the ATCF.

Edited :-)
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Quoting FunnelVortex:
Come on, NOAA, send out some HHs.
latest comment from the nhc says it wont get any stronger..we will see if that comes true or not later on.
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Member Since: May 23, 2012 Posts: 0 Comments: 4984
Quoting weatherh98:
Nice outflow on the western and northern sides
she's cutting off the dry air :) Andrea win
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With that clear patch between the bands, will the potential appearance of the sun allow for stronger storms or does it not matter when it is tropical of nature? Please don't shoot the messenger. I am 9 year veteran who mostly lurks on this site.

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Quoting AussieStorm:
1-1-0
Why do you say that?
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Come on, NOAA, send out some HHs.
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thanks doc, wind is picking up here now guess that line of storms is getting closer to me now.
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.
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She will make Hurricane status.
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Thanks for the update Dr. Masters!
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Nice outflow on the western and northern sides
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Great post Dr. Masters! Thanks.
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2 Invests
1 Tropical Storm
0 Hurricanes
0 Major Hurricanes
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Thanks, Dr. Masters.

Good night all.



I'll leave you with my earlier blog entry on Andrea.
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Thanks, Doc. It's an interesting start for the season.
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Thanks Dr. Masters
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Thanks doc !:)
Member Since: May 23, 2012 Posts: 0 Comments: 4984

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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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