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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strong

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Quoting TropicalAnalystwx13:

Lol, thanks but I'm not an expert at this.
Yes you are at least compare with me. I should focus this summer on understanding more about tornadoes.
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Quoting Tropicsweatherpr:
Wave mentioned at TWO.

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.




That wave now gaining model support from the GFS. Going to be another interesting week next week.
Member Since: February 28, 2013 Posts: 9 Comments: 4692
1000.8 mb
(~ 29.55 inHg)

from recon
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Quoting hurricanehunter27:
From satellite there was some definite ground scarring. But from the ground it is much hard to see anything. They seem to have found only EF3 level damage on the ground.


The Reno EF 5 was determined by reviewing mobile doppler Radar Imagery.

Member Since: July 3, 2005 Posts: 428 Comments: 129808
Time: 17:42:00Z
Coordinates: 29.3N 84.05W
Acft. Static Air Press: 843.3 mb (~ 24.90 inHg)
Acft. Geopotential Hgt: 1,477 meters (~ 4,846 feet)
Extrap. Sfc. Press: 1000.8 mb (~ 29.55 inHg)
D-value: -
Flt. Lvl. Wind (30s): From 77° at 24 knots (From the ENE at ~ 27.6 mph)
Air Temp: 14.5°C (~ 58.1°F)
Dew Pt: 12.9°C (~ 55.2°F)
Peak (10s) Flt. Lvl. Wind: 26 knots (~ 29.9 mph)
SFMR Peak (10s) Sfc. Wind: 31 knots (~ 35.6 mph)
SFMR Rain Rate: 0 mm/hr (~ 0 in/hr)
Member Since: Posts: Comments:
Quoting SLU:


let's see if they will at least designated it today


This wave had to be mentioned two days ago and say the same sentence as they did at 2 PM.
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Quoting allancalderini:
I agre that is why I have my doubts but you are the expert in tornadoes between the two.:D thanks Cody.

Lol, thanks but I'm not an expert at this.
Member Since: July 6, 2010 Posts: 113 Comments: 32809
Member Since: July 3, 2005 Posts: 428 Comments: 129808
Quoting K8eCane:


I thought I saw a satellite pic of some ground scouring that correlated with the path.
From satellite there was some definite ground scarring. But from the ground it is much harder to see any form of ground scarring. They seem to have found only EF3 level damage on the ground.
Member Since: July 22, 2010 Posts: 1 Comments: 3852
864. SLU
Quoting JRRP:

That is an INVEST at least...


let's see if they will at least designated it today
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Quoting GTcooliebai:
That is an awesome statistic!


Thanks, Looks my 2 hours of research last night payed off :)

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Quoting TropicalAnalystwx13:

Winds of EF4 and EF5 intensity are typically capable of scouring the ground and debarking any nearby trees. Radar measured winds well over 250 mph just above the surface, so I have no doubt that winds of at least 200 mph made it to the surface. That's what makes this whole tornado very strange.


I thought I saw a satellite pic of some ground scouring that correlated with the path.
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861. JRRP
Quoting SLU:


Thanks

Sustained winds of 33mph clocked at NOAA buoy 41041 as the CATL wave (un-numbered TD) closes in.


That is an INVEST at least...
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860. SLU
Quoting zampaz:


A link to the NASA Earth Science Office GOES sattelite feeds:
Link
Please note an app is run in Firefox by this site.
-z
My first relevant contribution to the wunderground!


congrats
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Quoting nrtiwlnvragn:



PUNTA GORDA RAIN 75 72 88 SW37G58 29.80S FOG


Link


Wow, this storm has an odd wind field. Winds here are 5-10 mph right now, even as heavier rain has moved in.
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Quoting Speeky:
T.S. Andrea is the Atlantic's 1500th tropical storm since record keeping began in 1851
That is an awesome statistic!
Member Since: August 31, 2009 Posts: 0 Comments: 5628
Quoting TropicalAnalystwx13:

Winds of EF4 and EF5 intensity are typically capable of scouring the ground and debarking any nearby trees. Radar measured winds well over 250 mph just above the surface, so I have no doubt that winds of at least 200 mph made it to the surface. That's what makes this whole tornado very strange.
I agre that is why I have my doubts but you are the expert in tornadoes between the two.:D thanks Cody.
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856. SLU
000
ABNT20 KNHC 061732
TWOAT

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.

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.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.
Member Since: Posts: Comments:
Quoting Neapolitan:
I feel you. Just like you, I, too, have savored the sweetness of forecasting success after the bitter taste that comes from weeks of calling for things that failed to materialize. Now we both know how Joe Bastardi feels... ;-)

Still nothing but sprinkles here in Naples. True fact: there are locations in Florida that received more rain in a single hour today than my town has seen since The Main Event got underway. Go figure...


Nea, I think that your drought is soon to end...

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Member Since: July 3, 2005 Posts: 428 Comments: 129808
Quoting allancalderini:
I am not a tornado fan or something close as they terrified me so I am not good at knowing when a tornado is this category or the other,but I mean if it was a EF5 wouldn`t there be damage on the ground that support that intensity?

Winds of EF4 and EF5 intensity are typically capable of scouring the ground and debarking any nearby trees. Radar measured winds well over 250 mph just above the surface, so I have no doubt that winds of at least 200 mph made it to the surface. That's what makes this whole tornado very strange.
Member Since: July 6, 2010 Posts: 113 Comments: 32809
Member Since: July 3, 2005 Posts: 428 Comments: 129808
Wave mentioned at TWO.

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.


Member Since: Posts: Comments:
Here is the video of Tampa Bay at High Tide,

Link
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She was around 995mbs probably cause recon left at 996.8 before Andrea maxed out 2-3hrs later... but her pressure is back up to 1002 or maybe 1001 ish
Member Since: January 22, 2006 Posts: 0 Comments: 1723

103
WFUS52 KTBW 061738
TORTBW
FLC015-071-061800-
/O.NEW.KTBW.TO.W.0023.130606T1738Z-130606T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
138 PM EDT THU JUN 6 2013

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHEASTERN CHARLOTTE COUNTY IN SOUTHWEST FLORIDA...
NORTHEASTERN LEE COUNTY IN SOUTHWEST FLORIDA...
THIS INCLUDES THE CITY OF FORT MYERS...

* UNTIL 200 PM EDT

* AT 138 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
TORNADO NEAR FORT MYERS...MOVING NORTHEAST AT 50 MPH.

* THE TORNADO WILL BE NEAR...
TICE...SUNCOAST ESTATES.
FORT MYERS SHORES.

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.

TO REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE PLEASE CALL
813-645-2323.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT THURSDAY EVENING
FOR WESTERN FLORIDA.



LAT...LON 2654 8187 2667 8201 2696 8169 2686 8155
2679 8156
TIME...MOT...LOC 1738Z 224DEG 42KT 2667 8186
Member Since: July 3, 2005 Posts: 428 Comments: 129808
We are getting soaked today in Orlando and now the nasty bands of rain and storms are just heading in. Couple of trees down and wind is definitely picking up. Are the bands approaching Orlando more intense than what we've already experienced? TIA
Member Since: Posts: Comments:
Quoting Patrap:
Dry air has corrupted the center

There cooler waters in that area....
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1002.0 mb
(~ 29.59 inHg)


44.0 knots (~ 50.6 mph)
Tropical Storm

she hasnt weakened much
Member Since: Posts: Comments:
Quoting allancalderini:
I am not a tornado fan or something close as they terrified me so I am not good at knowing when a tornado is this category or the other,but I mean if it was a EF5 wouldn`t there be damage on the ground that support that intensity?
Not always. You can have an EF5 in a field and it could be rated as an EF0 as it hit nothing to show winds up to that level.
Member Since: July 22, 2010 Posts: 1 Comments: 3852
Quoting TropicalAnalystwx13:

Nah. Unless I'm blind, the article mentioned nothing about it [the downgrade] actually being considered, just that Greg Carbin thinks the tornado shouldn't be given EF5 designation. Greg is old school and thinks the EF scale should be used only for what ground damage is observed.

Which raises the question: consistency (rating it EF3 because that's what was observed) or accuracy (rating it EF5 because that's what our sophisticated radar data supports)?
I am not a tornado fan or something close as they terrified me so I am not good at knowing when a tornado is this category or the other,but I mean if it was a EF5 wouldn`t there be damage on the ground that support that intensity?
Member Since: Posts: Comments:
T.S. Andrea is the Atlantic's 1500th tropical storm since record keeping began in 1851
Member Since: Posts: Comments:
Quoting SLU:


It looks as if it came back online on accuweather's site. Not sure though ....

Link


A link to the NASA Earth Science Office GOES sattelite feeds:
Link
Please note an app is run in Firefox by this site.
-z
My first relevant contribution to the wunderground!
Member Since: Posts: Comments:
Big rain coming soon S FL!

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Quoting HurrMichaelOrl:


Certainly not tropical storm force sustained winds. Have there been any reports of high sustained winds in FL from Andrea (not including tornado activity, just from the storm's wind field itself)?



PUNTA GORDA RAIN 75 72 88 SW37G58 29.80S FOG


Link
Member Since: September 23, 2005 Posts: 15 Comments: 11341
Member Since: July 3, 2005 Posts: 428 Comments: 129808
Winds in Cedar Key are now 31 mph gusting to 37.
Member Since: Posts: Comments:
Time: 17:31:30Z
Coordinates: 29.7N 84.5167W
Acft. Static Air Press: 842.4 mb (~ 24.88 inHg)
Acft. Geopotential Hgt: 1,500 meters (~ 4,921 feet)
Extrap. Sfc. Press: 1002.4 mb (~ 29.60 inHg)
D-value: -
Flt. Lvl. Wind (30s): From 1° at 28 knots (From the N at ~ 32.2 mph)
Air Temp: 15.4°C (~ 59.7°F)
Dew Pt: 11.1°C (~ 52.0°F)
Peak (10s) Flt. Lvl. Wind: 29 knots (~ 33.3 mph)
SFMR Peak (10s) Sfc. Wind: 44 knots (~ 50.6 mph)
SFMR Rain Rate: 5 mm/hr (~ 0.20 in/hr)
Member Since: Posts: Comments:
Quoting SiestaCpl:


Only sustained winds of 25-30 in the Tampa area, but in Sarasota/Bradenton we topped out near 35 mph, gusts to 60 pmh. Those were from a particularly strong line of training storm cells and not from a connected wind field.


+1
Member Since: January 22, 2006 Posts: 0 Comments: 1723
Wind are picking up now in WPB!
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Quoting Patrap:


A grey me,yes.

; )
Ya do have a little snow on the doo...:)
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Dry air has corrupted the center

Member Since: July 3, 2005 Posts: 428 Comments: 129808
Quoting Patrap:


A grey me,yes.

; )


Nice to put a face with the poster!
Member Since: March 10, 2006 Posts: 0 Comments: 10765
Quoting HurrMichaelOrl:


Certainly not tropical storm force sustained winds. Have there been any reports of high sustained winds in FL from Andrea (not including tornado activity, just from the storm's wind field itself)?


Only sustained winds of 25-30 in the Tampa area, but in Sarasota/Bradenton we topped out near 35 mph, gusts to 60 pmh. Those were from a particularly strong line of training storm cells and not from a connected wind field.
Member Since: June 26, 2008 Posts: 0 Comments: 383
Quoting nash36:
It appears once again, I will be dealing with the "middle of the night" arrival of yet another tropical system. Dealt with enough of those in 2004. The weather radio is gonna be barking all night. It's bad enough to have rain-wrapped tornadoes moving at 60mph. Add darkness to that and it becomes much worse. Ugh.


Hard rain? Sleep like a baby. Lightning crackling and slamming right next door, house shaking? Sleep like a baby. Tropical storm/hurrican dying over land? Cannot sleep a wink worrying about tornado's. Wish I didn't have to work tomorrow...
Member Since: Posts: Comments:
Quoting allancalderini:
Yeah I read it probably going to be downgrade to EF4

Nah. Unless I'm blind, the article mentioned nothing about it [the downgrade] actually being considered, just that Greg Carbin thinks the tornado shouldn't be given EF5 designation. Greg is old school and thinks the EF scale should be used only for what ground damage is observed.

Which raises the question: consistency (rating it EF3 because that's what was observed) or accuracy (rating it EF5 because that's what our sophisticated radar data supports)?
Member Since: July 6, 2010 Posts: 113 Comments: 32809
Thanks for travel advice early this morning Keeper of the Gate and others. Decided to wait to travel from Pensacola to Jacksonville to Daytona Beach until Friday. Bunch of traffic heading east all day, but I won't forget one trucker during Ivan, all well til I-10 bridge. I don't think his body ever found in all that marsh in Escambia River.
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Quoting GTcooliebai:
If you find that, put it up on here, I really want to see that. LOL


It was several years ago but i know i must still have it. Will look for it lol
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Quoting barbamz:
The attack of the red blobs...Aaaaarrrgghh..!
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Quoting gator23:
Why is Gainesville under a tropical storm warning it looks like we will get nothing.


Certainly not tropical storm force sustained winds. Have there been any reports of high sustained winds in FL from Andrea (not including tornado activity, just from the storm's wind field itself)?
Member Since: Posts: Comments:

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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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