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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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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Quoting Levi32:


It was close, but definitely not, in my view. 70kt winds at 6k feet is like saying the recon measured 70kt flight-level winds, which it just did. That's reduced to 55kt as a surface estimate. I also still have yet to see a hurricane with an exposed center of circulation, though I'm sure now that I've said that someone will post a picture of one. ~990mb with an uncovered center isn't going to give sustained hurricane-force winds. This is and has been a strong tropical storm.


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 :)
Member Since: January 22, 2006 Posts: 0 Comments: 1689
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?

No, she's still Tropical, and will remain Tropical until she becomes Post-Tropical
Member Since: June 2, 2013 Posts: 8 Comments: 1285
1021. Skyepony (Mod)
Recon is just off the west coast of FL headed south. Might see it off Tampa right now..
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Very impressive for being early June.

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1019. sar2401
Quoting hurricanes2018:
I see new t.storms in the center on the low or tropical wave next to 47 west!!

Me too!!!
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1018. Gearsts
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1017. sar2401
Quoting moonlightcowboy:


It actually looks fairly impressive. Rotation, good low-level almost symmetrical vorticity, good moisture field, apt con/divergence, mid-level shear not as strong as upper levels. If it can maintain circulation steadily growing some convection around its coc, until it tracks further west or upper shear relaxes, etc, etc - you know the routine! :) Very impressive for early June.

Looks impressive to me as well. Convection and organization appears to be getting better, not worse. If this "wall of shear" doesn't get it, it will certainly be classifed as a TD within the next 24 hours.
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1016. Gearsts
Quoting JLPR2:


Yep, I don't have a good feeling about this year, just hoping the feeling turns out to be nothing.
LOL i remember you saying the same thing last year ;)
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I see new t.storms in the center on the low or tropical wave next to 47 west!!
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1014. JLPR2
Quoting Tropicsweatherpr:


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


Yep, I don't have a good feeling about this year, just hoping the feeling turns out to be nothing.
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Is Andrea a sub tropical storm now? or in the process.....her pressure drops indicate that? she looks like in on satellite presentation?
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1012. Skyepony (Mod)
Fresh ASCAT
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yellow at 0%
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1010. K8eCane
Quoting hurricanehunter27:
It got all the way to 63k ft.


Whoa!
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Quoting JLPR2:


Yes, if it had nicer upper level winds it would probably be circled in orange or red. Really nice structure for a June wave.


Not a good sign for those of us who live in Hurricane alley.
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1008. Gearsts
Quoting Levi32:


Well that's as it was being sheared and weakening. I can buy a lagged advisory where it's technically a hurricane while rapidly weakening, but it wasn't exposed at classification as a hurricane:

Levi why can't i loop the 10m Zonal Wind Anomaly (7-day Averages)for the gfs and gem, it only says Week 1 and 2.
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1007. sar2401
Quoting notanotherwrong:
what a bogus storm this was a waste of a name

Poof!
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Quoting notanotherwrong:
what a bogus storm this was a waste of a name


U DA MAN! Don't let anybody tell u otherwise.
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1005. JLPR2
Quoting moonlightcowboy:


It actually looks fairly impressive. Rotation, good low-level almost symmetrical vorticity, good moisture field, apt con/divergence, mid-level shear not as strong as upper levels. If it can maintain circulation steadily growing some convection around its coc, until it tracks further west or upper shear relaxes, etc, etc - you know the routine! :) Very impressive for early June.


Yes, if it had nicer upper level winds it would probably be circled in orange or red. Really nice structure for a June wave.
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Yeah, impressive for early June.
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Change my mind Noel in 2001 is the most horrible hurricane I had ever seen.
Member Since: October 15, 2011 Posts: 0 Comments: 4309
Quoting flcanes:
Isnt it ironic, in both 2005 and 2013 the first landfalling storm was a ts in florida in early june.
No.
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1000. nigel20
Quoting hurricanehunter27:
While this is all going on a monster is brewing at 98W.


Yes indeed! It looks pretty ominous.
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TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT THU JUN 6 2013

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

THE NATIONAL HURRICANE CENTER IS ISSUING ADVISORIES ON TROPICAL
STORM ANDREA...LOCATED OVER THE NORTHEASTERN GULF OF MEXICO.

1. SHOWER ACTIVITY INCREASED DURING THE MORNING IN ASSOCIATION WITH A
TROPICAL WAVE LOCATED ABOUT 850 MILES EAST OF THE LESSER ANTILLES.
UPPER-LEVEL WINDS ARE NOT FAVORABLE FOR ADDITIONAL DEVELOPMENT...
AND THIS SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...OF BECOMING
A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.


a new yellow with 0 %
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Isnt it ironic, in both 2005 and 2013 the first landfalling storm was a ts in florida in early june.
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Quoting K8eCane:


i had heard it went as high as 50,000
It got all the way to 63k ft.
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Quoting Levi32:


Well that's as it was being sheared and weakening. It wasn't exposed at classification as a hurricane:

Hurricane Nate of 2011 is the weirdest hurricane I have seen and I believe Noel of 2001 was also horrible.
Member Since: October 15, 2011 Posts: 0 Comments: 4309
Quoting sar2401:

Good afternoon, Nigel. Very wet day up here in the SE United States. How are things down your way?

We had some moderate rain and gusty winds early this morning.
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Member Since: July 3, 2005 Posts: 423 Comments: 128256
Quoting GeorgiaStormz:
#Tornado sighted at 2:10 pm from Ft. Myers/SW Fla. Int'l Airport. Storm has since moved east and warning expired. #andrea


That's right down the road from me... It got kinda nasty here a few mins ago, trash cans flying down the street. Nothing too bad though..
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Quoting JLPR2:
Tropical wave decided to light up a little too late, shear got a hold of it and the NHC gave it a circle at last.


It actually looks fairly impressive. Rotation, good low-level almost symmetrical vorticity, good moisture field, apt con/divergence, mid-level shear not as strong as upper levels. If it can maintain circulation steadily growing some convection around its coc, until it tracks further west or upper shear relaxes, etc, etc - you know the routine! :) Very impressive for early June.
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701
WFUS52 KMLB 061832
TORMLB
FLC111-061845-
/O.NEW.KMLB.TO.W.0024.130606T1832Z-130606T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
232 PM EDT THU JUN 6 2013

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
NORTHEASTERN ST. LUCIE COUNTY IN FLORIDA...
THIS INCLUDES THE CITIES OF...INDRIO...FORT PIERCE...FORT PIERCE
INLET...

* UNTIL 245 PM EDT.

* AT 227 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR FORT PIERCE
NORTH...OR ABOUT NEAR FORT PIERCE...MOVING NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
QUEENS COVE

THE IMMEDIATE DANGER OF A TORNADO IS HIGH. PEOPLE IN THE PATH OF THIS
DEVELOPING TORNADO ARE URGED TO QUICKLY PREPARE FOR ITS APPROACH.
THIS IS A DANGEROUS SITUATION! ACT NOW AS SECONDS CAN SAVE LIVES!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A STRONG BUILDING ON
THE LOWEST FLOOR...IN AN INTERIOR ROOM SUCH AS A BATHROOM OR CLOSET.
KEEP AWAY FROM WINDOWS. GET UNDER A WORKBENCH OR OTHER PIECE OF
STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY.
EVACUATE MOBILE HOMES OR VEHICLES FOR MORE SUBSTANTIAL SHELTER.

THE TORNADO WILL LIKELY BE WRAPPED IN HEAVY RAIN MAKING IT DIFFICULT
TO SEE. BE SMART AND REACT NOW!



LAT...LON 2741 8028 2743 8030 2745 8031 2744 8031
2740 8029 2738 8031 2749 8047 2756 8041
2756 8031 2747 8028 2742 8027
TIME...MOT...LOC 1832Z 217DEG 29KT 2751 8033
Member Since: July 3, 2005 Posts: 423 Comments: 128256
Quoting TropicalAnalystwx13:

40k, sorry.


i had heard it went as high as 50,000
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Quoting allancalderini:
Hi Nigel how was your birthday?

It was pretty good thanks for asking.
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#Tornado sighted at 2:10 pm from Ft. Myers/SW Fla. Int'l Airport. Storm has since moved east and warning expired. #andrea
Member Since: February 11, 2012 Posts: 0 Comments: 9727

965
WFUS52 KMLB 061830
TORMLB
FLC061-061900-
/O.NEW.KMLB.TO.W.0023.130606T1830Z-130606T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
230 PM EDT THU JUN 6 2013

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHEASTERN INDIAN RIVER COUNTY IN FLORIDA...
THIS INCLUDES THE CITIES OF...WINTER BEACH...WABASSO...VERO BEACH
SOUTH...VERO BEACH...GIFFORD...

* UNTIL 300 PM EDT.

* AT 227 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR WINTER
BEACH...MOVING NORTHEAST AT 45 MPH.

* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A STRONG BUILDING ON
THE LOWEST FLOOR...IN AN INTERIOR ROOM SUCH AS A BATHROOM OR CLOSET.
KEEP AWAY FROM WINDOWS. GET UNDER A WORKBENCH OR OTHER PIECE OF
STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY.

EVACUATE MOBILE HOMES OR VEHICLES FOR MORE SUBSTANTIAL SHELTER.



LAT...LON 2759 8034 2759 8040 2768 8053 2782 8045
2781 8045
TIME...MOT...LOC 1830Z 209DEG 40KT 2772 8044



67
Member Since: July 3, 2005 Posts: 423 Comments: 128256
Quoting TropicalAnalystwx13:

Here ya go, buddy. Lol.



Well that's as it was being sheared and weakening. I can buy a lagged advisory where it's technically a hurricane while rapidly weakening, but it wasn't exposed at classification as a hurricane:

Member Since: November 24, 2005 Posts: 635 Comments: 26647
984. VR46L
Andrea 24 hr

Morphed Integrated Microwave Imagery at CIMSS (MIMIC)

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Quoting Chapelhill:
4k feet or 40k?

40k, sorry.
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Quoting TropicalAnalystwx13:

Here ya go, buddy. Lol.




that looks like Andrea twin
Member Since: May 21, 2006 Posts: 5091 Comments: 115076
981. Skyepony (Mod)
AP12 & CMC did alright on Andrea in the last 72hrs. The rest bombed. Intensity was off too, alot of negative numbers there.
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Quoting CybrTeddy:


And I mentioned it two days ago! :)


Taz probably mentioned it first, lol.
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Quoting nigel20:
Good afternoon friends!
Hi Nigel how was your birthday?
Member Since: October 15, 2011 Posts: 0 Comments: 4309
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,
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Quoting CybrTeddy:
After Andrea moves inland, it's unlikely we will see another storm within the next two-three weeks as the downward MJO phase returns. The CFS shows an upward phase returning by late June-early July, so something to watch out for in the far future.


2005 didnt start up again to late june either.....

scary......

lol jk im just messing with you guys.
Member Since: February 11, 2012 Posts: 0 Comments: 9727
Quoting TropicalAnalystwx13:
The El Reno supercell, 4k feet in the air:

4k feet or 40k?
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Quoting TylerStanfield:

Mentioned that earlier... :)


And I mentioned it two days ago! :)
Member Since: July 8, 2005 Posts: 259 Comments: 24016
Quoting Levi32:


It was close, but definitely not, in my view. 70kt winds at 6k feet is like saying the recon measured 70kt flight-level winds, which it just did. That's reduced to 55kt as a surface estimate. I also still have yet to see a hurricane with an exposed center of circulation, though I'm sure now that I've said that someone will post a picture of one. ~990mb with an uncovered center isn't going to give sustained hurricane-force winds. This is and has been a strong tropical storm.

Here ya go, buddy. Lol.

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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.