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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

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

Hurricane

The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.

Reader Comments

And the hits just keep on comin'...





92L is heading my way... Lol it will be a naked swirl well before and we won't get a drop as usual.
Quoting TampaSpin:
How many of you owe the CMC MODEL an apology......LOL


Looks like the CMC's update may pay dividends...or it may have gotten lucky?...Time will tell.
RE: 1488

What happens when that Louisiana weather system and Andrea touch?
1506. Patrap
Lowering waLL Cloud due south of Midtown NOLA> Logging off..seeking shelter,,,
1507. MTWX
Quoting GreyJewel:
RE: 1488

What happens when that Louisiana weather system and Andrea touch?

Andrea is already stripping the storms off of the weaker system.

Link
... A Tornado Warning remains in effect until 630 PM EDT for central
Glynn County...

At 623 PM EDT... Weather Service Doppler radar continued to indicate a
severe thunderstorm with strong rotation. This tornado was located
near Dock Junction... moving north at 30 mph.

Other locations in the warning include but are not limited to
Everett.

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.


A Tornado Watch remains in effect until 1000 PM EDT Thursday evening
for northeastern Florida and southeast Georgia.


Lat... Lon 3133 8148 3132 8148 3128 8149 3122 8149
3116 8155 3119 8165 3144 8164 3145 8163
3136 8152
time... Mot... loc 2223z 164deg 25kt 3125 8159
1509. 10Speed
Quoting Patrap:
Lowering waLL Cloud due south of Midtown NOLA> Logging off..seeking shelter,,,



Take care!!!!
1510. sar2401
Quoting UKHWatcher:


Your own comment at 1465 was entirely personal and not weather related... T.S. Andrea is!

First, it was a joke.
Second, I was quoting from "Rules of the Road" here
Third, I was giving Barb a more common English usage of her German phrase.
06/06/2013 0600 PM

7 miles SW of Dock Junction, Glynn County.

Funnel cloud, reported by 911 call center.


Georgia Highway patrol reported a funnel cloud near
Interstate 95. Report relayed through the 911 center.
Quoting Patrap:
Lowering waLL Cloud due south of Midtown NOLA> Logging off..seeking shelter,,,


Wow! Stay safe there Pat!!!
fun time skimboarding today with Friends!:) Tropical Storm ANDREA Flooding = day off work fun!
92L...

1517. gator23
Still under a tropical storm warning here in GVILL NWS calling for 40 mph wind. NO IDEA WHY though. Radar says its over.
1518. Patrap
Backo....

Heavy Rain now, bad squall..but no Nado formed.
Quoting GeoffreyWPB:
92L...

Getting Organized,my be named.
1520. Patrap




I know it is has to pass through as John Hope used to say the Dagger of death shear, but with the oscat supporting a closed circulation, imo 92L is probably a 45mph Tropical Storm at the moment.
1523. 10Speed
Quoting Patrap:
Backo....

Heavy Rain now, bad squall..but no Nado formed.

Thanks for the update and welcome back Pat!!!!
That didn't work the way I wanted it to...
92L looks like it just hit a wall, you can see the LLC racing ahead. Even if it is a tropical cyclone, it's not going to be ever declared such.
Quoting Andrebrooks:
Getting Organized,my be named.

Its time to be named has come and gone. The convection you see blowing up is displaced well east of the actual low-level circulation.

This has been a tropical depression since Tuesday afternoon. Not that the NHC acknowledges that.
1527. Patrap
92L is 75% decoupled ATM due to westerly shear, and elongating NW to Se

1528. barbamz
Deleted. No issue.
Not much SAL
1530. Patrap
Quoting 10Speed:

Thanks for the update and welcome back Pat!!!!


Thanx 10Speed, was a Gnarly cell with spookie tail hanging
1531. nash36
The air outside has that "feeling" of an approaching tropical system. I felt the same thing when Frances and Jeanne were getting closer. Thankfully, this will be nothing like those two systems.
Quoting CybrTeddy:
92L looks like it just hit a wall, you can see the LLC racing ahead. Even if it is a tropical cyclone, it's not going to be ever declared such.


I agree it will probably be dead by morning,but it is an interesting feature that never got the attention it probably deserved
Link

Very Interesting wind map here ^^^^
Evening all.

Quoting HadesGodWyvern:
Philippines Atmospheric Geophysical Astronomical Services and Administration
Tropical Cyclone Outlook
5:00 AM PhST June 7 2013
==============================

At 4:00 AM PhST, a Low Pressure Area estimated at 460 km east of Borongan City, Eastern Samar (12.0N 130.0E).

I have been wondering about the quiet over there... seemed excessive for this time of year...
All quiet on the Western front in Quincy; only a light drizze. Can't say the same at the moment for Miami/Ft. Lauderdale area in term of rain looking at the radar. Those training bands are always a problem with many landfalling systems. Tallassee got caught in some persistent training bands when Alison came inland (after about 3 landfalls I think) and because of that particular angle, we got crushed here with over 20 inches of rain with major flooding.

Gonna go home and get ready for the Heat-Spurs game.

See Yall Tomorrow....................WW.
1537. nash36
Kind of surprised that a Tornado Watch hasn't been issued yet for Charleston. LLH is more than sufficient enough to warrant one.
1538. Patrap



MESOSCALE DISCUSSION 0982
NWS STORM PREDICTION CENTER NORMAN OK
0454 PM CDT THU JUN 06 2013

AREAS AFFECTED...COASTAL PLAIN OF GA AND SC

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 062154Z - 062330Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...THE AREA IS BEING MONITORED FOR THE POSSIBLE ISSUANCE OF A
TORNADO WATCH.

DISCUSSION...A CLUSTER OF LOW-TOPPED...SEMI-DISCRETE...TRANSIENT
SUPERCELLS WITHIN AN OUTER CONVECTIVE BAND IN THE NERN QUADRANT OF
TROPICAL STORM ANDREA IS ADVANCING NWD FROM WARE COUNTY TO CAMDEN
COUNTY IN SERN GA. THIS ACTIVITY LIES NEAR/E OF A SUBTLE WIND-SHIFT
AXIS EXTENDING NEWD FROM ANDREA. RELATIVELY HIGHER THETA-E EXISTS E
OF THIS AXIS OWING TO THE ONSHORE FLOW COMPONENT AND ACCOMPANYING
INLAND TRANSPORT OF A WARMER/MORE MOIST AIR MASS EMANATING FROM THE
WATERS OFF THE ATLANTIC COAST. HOWEVER...BUOYANCY IS ONLY
MARGINAL -- I.E. MLCAPE AROUND 500 J/KG -- OWING TO WIDESPREAD
THETA-E DEFICITS ACCOMPANYING A BROAD SHIELD OF LEADING
PRECIPITATION.

REGARDLESS...THERE WILL BE SOME POTENTIAL FOR SUFFICIENT BUOYANCY TO
EXTEND NEWD ALONG THE COASTAL PLAIN OF GA INTO SC THROUGH TO SUPPORT
CONVECTION -- WITH ADDITIONAL FEEDER BANDS POTENTIALLY MOVING INTO
THE AREA THIS EVENING FROM NRN FL -- AS ANDREA AND ITS NERN QUADRANT
MOVE NEWD. AT LEAST MODEST LOW-LEVEL SHEAR EXISTS PER JAX AND CLX
VWP DATA -- AIDED BY VERTICALLY VEERING WIND PROFILES IN THE LOWEST
3 KM AGL -- SUPPORTING 0-1-KM SRH OF 100-150 M2/S2 AFTER ACCOUNTING
FOR OBSERVED STORM MOTIONS. AS SUCH...A TORNADO THREAT MAY EXTEND
NEWD OVER THE GA/SC COASTAL PLAIN...POTENTIALLY REQUIRING ISSUANCE
OF A TORNADO WATCH.

..COHEN/MEAD.. 06/06/2013


ATTN...WFO...CHS...JAX...

LAT...LON 31368132 31368185 31058247 31108272 31308255 31828207
32698118 33178047 33037966 32887964 32488020 31938102
31368132
1539. Patrap
Hazardous marine condition(s):
Tropical Storm Warning
SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE
HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE
MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT.



ANZ088-070830-
CAPE FEAR TO 31N OUT TO 32N 73W TO 31N 74W-
617 PM EDT THU JUN 6 2013

TROPICAL STORM WARNING


TONIGHT
TROPICAL STORM CONDITIONS EXPECTED. W OF 1000 FM...S
TO SE WINDS 15 TO 25 KT INCREASING TO 35 TO 45 KT. SEAS 4 TO 7 FT
BUILDING TO 8 TO 15 FT. E OF 1000 FM...S WINDS 10 TO 15 KT
INCREASING TO 20 TO 30 KT. SEAS 3 TO 5 FT BUILDING TO 6 TO 10 FT.
NUMEROUS SHOWERS AND SQUALLS OCCASIONALLY LOWERING VSBY BELOW 1
NM.

FRI
TROPICAL STORM CONDITIONS EXPECTED. W OF 1000 FM...S TO SW
WINDS 30 TO 40 KT DIMINISHING TO 20 TO 30 KT. SEAS 8 TO 17 FT. E
OF 1000 FM...S TO SW WINDS 20 TO 30 KT. SEAS BUILDING TO 9 TO 17
FT...HIGHEST NW. SCATTERED SHOWERS AND TSTMS.

FRI NIGHT
S TO SW WINDS DIMINISHING TO 15 TO 20 KT. SEAS
SUBSIDING TO 4 TO 7 FT...EXCEPT E OF 1000 FM 7 TO 9 FT...HIGHEST
NE. SCATTERED SHOWERS AND TSTMS.

SAT
S TO SW WINDS 10 TO 20 KT. SEAS BECOMING 4 TO 7 FT
THROUGHOUT...HIGHEST NE. ISOLATED SHOWERS AND TSTMS.

SAT NIGHT AND SUN
S TO SW WINDS 10 TO 15 KT. SEAS SUBSIDING TO
3 TO 5 FT SAT NIGHT.

MON AND TUE
S TO SW WINDS 10 TO 20 KT. SEAS 3 TO 6 FT.

$$
I say 2/1/0 that what i say so far for this season!
1541. sar2401
Quoting Patrap:
Routine testing at Redstone creates unusual radar patterns/a>

Mystery Blob Over West Huntsville


animated Images




I've posted about this thing several times now. There were air defense exercises over Redstone, part of which involved launching chaff containers. The radar and chaff cloud happened to be in the right place. There's really nothing mysterious about it.
Quoting nash36:
Kind of surprised that a Tornado Watch hasn't been issued yet for Charleston. LLH is more than sufficient enough to warrant one.


Evening Nash, good to see ya. How's life over at the "other" big manufacturer?

I would think they'll issue one this evening.
1545. vis0
Quoting Speeky:
T.S. Andrea is the Atlantic's 1500th tropical storm since record keeping began in 1851
Quoting GTcooliebai:
That is an awesome statistic!
add to that, is the first 100yrs about 1/4 were missed/not observed
1546. barbamz

Evening sun is finally coming out at the Riverview/FL cam. Peaceful night to everyone!
1547. Patrap
Quoting sar2401:

I've posted about this thing several times now. There were air defense exercises over Redstone, part of which involved launching chaff containers. The radar and chaff cloud happened to be in the right place. There's really nothing mysterious about it.



Indeed..


,a Link for those who may be interested
Quoting stormpetrol:


I agree it will probably be dead by morning,but it is an interesting feature that never got the attention it probably deserved

If the NHC wouldve taken 92L into consideration 2 days ago, we couldve gotten something out of it, but for now... it was just an impressive early season wave...
1549. Patrap
1550. sar2401
Quoting Patrap:


Thanx 10Speed, was a Gnarly cell with spookie tail hanging

I'm glad to hear it wasn't a problem. We get persistent public reports of tornadoes when it's really a shelf cloud with a lot oflow hanging scud. I'm sure you've been around long enough to know the difference.
1551. nash36
Quoting StormJunkie:


Evening Nash, good to see ya. How's life over at the "other" big manufacturer?

I would think they'll issue one this evening.


Hey SJ!!! Good to see you too my friend.
Life is good at the "place we will not mention." LOL! We're very busy. Lots of new work coming in, so I rarely get to spend much time at home with the family. I also work 2nd shift (which I really dislike) but it is what it is.

Now I am just waiting for Andrea to say hello. My pool, however, does NOT need her to drop by. I'm gonna end up bailing water.
1552. ncstorm
Good Afternoon..

looks like the Euro moved west some..wouldnt this be interesting if Andrea rode up the gulf stream instead of land..

00z Euro




12z Euro
1553. Dakster
I think NHC says it best about 92L - Near 0% of development in the next couple of days.

After that -- who knows. Just gotta wait and see.
1554. K8eCane
Quoting ncstorm:
Good Afternoon..

looks like the Euro moved west some..wouldnt this be interesting if Andrea rode up the gulf stream instead of land..

00z Euro




12z Euro



I have seen it happen
1555. ncstorm
WPC latest rainfall

1556. skook

By: WFTS Staff

ST.PETERSBURG, Fla. -
 Lightning struck a power line Thursday, dropping the
possibly live wire to the ground on the Gandy Bridge, according to the
Florida Highway Patrol.  Traffic has been stopped in both directions,
and TECO is heading to the scene. Stay with abcactionnews.com as the story develops.


Quoting nash36:


Hey SJ!!! Good to see you too my friend.
Life is good at the "place we will not mention." LOL! We're very busy. Lots of new work coming in, so I rarely get to spend much time at home with the family. I also work 2nd shift (which I really dislike) but it is what it is.

Now I am just waiting for Andrea to say hello. My pool, however, does NOT need her to drop by. I'm gonna end up bailing water.


I hear ya. I'm on third. People say it's better than second, but I'm not convinced. Only good thing about it is I don't have to get up to see the 00z runs...lol


Evening Baha, K8, nc, Dak and everyone else.


Wow the Atlantic is WET!! The opposite of last year!
1559. nash36
Quoting ncstorm:
WPC latest rainfall



Wonderful. Over 5" for Charleston if that verifies.
Quoting Sasha:
You're right... I just read where they re-use these names every 6 years or so... The 2001 TS Barry actually killed 3 people in Florida and 6 in Cuba for a total of 9 dead... I just think it might be bad karma to re-use a name like that... Hope my question wasn't too foolish! I usually just lurk here...

Unless the US or Cuba requests that the name be retired, they will use it again. It's supposed to suggest that the discontinued storm has a special place in history, I think.
1561. K8eCane
Quoting StormJunkie:


I hear ya. I'm on third. People say it's better than second, but I'm not convinced. Only good thing about it is I don't have to get up to see the 00z runs...lol


Evening Baha, K8, nc, Dak and everyone else.


Hey SJ! May as well ask you like i always do. Are you chasin this season?
1562. Dakster
Quoting nash36:


Wonderful. Over 5" for Charleston if that verifies.


Can I send you all of South Florida's rain too...
im seeing and ENE jog, if that continues for another hour or 2 that could lead to a slightly offshore track.
Quoting nash36:


Wonderful. Over 5" for Charleston if that verifies.



That will make the frogs in my yard very happy.
JeffMasters has created a new entry.
1566. Patrap
Chasing Oklahoma: Too Dangerous for One Team?

By: Sean Breslin
Published: June 5, 2013


Storm chasing remains a serious business for Roger Hill following a deadly string of Plains tornadoes.

The leader of Silver Lining Tours, Hill takes vans full of eager weather enthusiasts on week-long trips to capture twisters, and from April through July, the caravan is jam-packed. A day before the deadly EF5 tornado hit El Reno, Okla., Hill wrapped up his latest chase tour -- one that ended in Oklahoma.

It might end up being the last time he ever takes a group to that state to look for tornadoes.

"We may just abandon that area altogether," said Hill, wary of a situation similar to the one that occurred Friday afternoon. The tornado that killed four storm chasers and injured several others behaved erratically before taking a turn into an area chasers thought was a safe distance from the storm.

(MORE: Why Storm Chasing is So Critical)


WEATHER.COM PHOTO
Roger Hill chats with Weather Channel meteorologist Mike Bettes in Grover, Colo. during the 2011 Tornado Hunt.

One of the chasers that died was Tim Samaras, Hill's next-door neighbor in Colorado. Hill said he's still in shock and disbelief about the tragedy, confirming Samaras' reputation for being one of the safest chasers in the field.
"Something horrendously wrong had to happen for them to get caught in that," added Hill.

Even in the aftermath of deaths that floored the weather community, Hill said there have been no cancellations of future storm chasing tours, mostly because he hasn't fielded a single phone call from anyone who wants to cancel his or her trip. Quite the opposite has happened, in fact -- Hill said the recent tornadoes have actually stirred more interest in his tours than normal.

He believes this is because of the track record of the Silver Lining Tours. They're well-known for spotting scores of tornadoes every year, but also because their safety guidelines keep visitors at ease while witnessing one of the most violent natural phenomena on the planet.

The tour didn't always abide by as many rules as it does in 2013, but when one group was nearly caught in the Joplin tornado, many more precautions were added to Hill's outings. On May 22, 2011, the group made a routine rest stop when a storm re-developed that would eventually spawn the monster EF5 tornado that would rip through Joplin, Mo., killing more than 160 people. Hill's caravan was just blocks from the twister.

"That's as close as I ever want to be (to a tornado)," Hill said.

(MORE: El Reno Tornado Now the Widest Twister on Record)

Since that close call, Hill implemented rules that combat both challenges faced during the Joplin tornado. His team will never chase in a city setting again, and if a tornado is shielded by rain -- "rain-wrapped," as meteorologists call it -- they will flee the area.

Combining those guidelines with previously-enforced rules to keep a safe distance and plot several escape routes if a tornado begins to close in or change direction, and Hill believes his tours can keep a spotless track record of safety with the guests.

Even if he never chases in Oklahoma again.




CMC 240HR off N FL??
1568. sar2401
Quoting stormpetrol:




I know it is has to pass through as John Hope used to say the Dagger of death shear, but with the oscat supporting a closed circulation, imo 92L is probably a 45mph Tropical Storm at the moment.

I believe it also. If not for Andrea blowing up at the same time, I'm sure we'd all be arguing about 92L instead. :-)
1570. Patrap
Quoting WunderAlertBot:
JeffMasters has created a new entry.
1571. K8eCane
NEW BLOG
??
does anyone have a center position for 92L
where does one find that info?
Quoting KEEPEROFTHEGATE:


Andrea's looking to go right over my house. Glad I cancelled my weekend plans. Driving 300 km through 75 km/h winds and a lot of rain is not my idea of fun.