Tropical Storm Andrea hits Florida

By: Dr. Jeff Masters , 11:19 PM GMT on June 06, 2013

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Tropical Storm Andrea made landfall near 5:40 pm EDT in the Big Bend region of Florida as a tropical storm with 65 mph winds. Andrea had a busy day Thursday in Florida, dumping heavy rains, spawning ten tornadoes, and bringing a storm surge of up to 4.5' to the coast. While the Hurricane Hunters did measure sustained winds of 65 mph over the ocean shortly before landfall, very few land stations recorded sustained winds in excess of tropical storm force, 39 mph. Here are some of the higher winds measured at coastal stations:

A personal weather station at Bald Point State Park near Apalachicola had sustained winds of 46 mph at 10 am EDT.
Cedar Key had sustained winds of 40 mph, gusting to 50 mph, at 3:43 pm EDT.
Punta Gorda had sustained winds of 37, gusting to 58, at 1:04 pm EDT.
St. Petersburg topped out at 34 mph, gusting to 48 mph, at 10:23 am EDT.

Two sets of tornadic rain bands moved through West Florida on Thursday, one between 2 am and 5 am, and the other between 10 am and 3 pm, spawning a total of five suspected tornadoes. The first band produced two EF-0 tornadoes: one with 75 mph winds that hit Myakka City, damaging 3 homes and 10 other buildings, and one with 80 mph winds that cut throughout the heart of Sun City, causing minor damage. NWS damage surveys will be occurring Friday in Fort Myers, Venice, Clearwater, and Gulfport to check out the damage swaths of the other three suspected tornadoes.

The Florida East Coast was hit by five suspected tornadoes. Only one caused an injury, a tornado that hit The Acreage in Palm Beach County at 6:45 am EDT. Two other tornadoes were reported in Broward and Palm Beach Counties, and two more were reported in coastal areas near the Georgia border.

Here are the highest storm surge values as of 7:00 pm EDT:

3.2' at Tampa (at McKay Bay Entrance)
2.5' at Clearwater Beach (near St. Petersburg)
4.5' at Cedar Key


Figure 1. MODIS satellite image of Tropical Storm Andrea at 1pm EDT Thursday, June 6, 2013. At the time, Andrea had top winds of 60 mph and was 5.7 hours away from landfall in Florida's Big Bend. Image credit: NASA.


Video 1. NASA animation of Andrea satellite images. More cool NASA images of Andrea are here.

The Atlantic hurricane season is getting longer
Andrea's formation in June continues a pattern of an unusually large number of early-season Atlantic named storms we've seen in recent years. Climatologically, June is the second quietest month of the Atlantic hurricane season, behind November. During the period 1870 - 2012, we averaged one named storm every two years in June, and 0.7 named storms per year during May and June. In the nineteen years since the current active hurricane period began in 1995, there have been fifteen June named storms (if we include 2013's Tropical Storm Andrea.) June activity has nearly doubled since 1995, and May activity has more than doubled (there were seventeen May storms in the 75-year period 1870 - 1994, compared to 6 in the 19-year period 1995 - 2013.) Some of this difference can be attributed to observation gaps, due to the lack of satellite data before 1966. However, even during the satellite era, we have seen an increase in both early season (May - June) and late season (November - December) Atlantic tropical storms. Dr. Jim Kossin of the University of Wisconsin looked at the reasons for this in a 2008 paper titled, "Is the North Atlantic hurricane season getting longer?" He concluded that there is a "apparent tendency toward more common early- and late-season storms that correlates with warming Sea Surface Temperature but the uncertainty in these relationships is high." He found that hurricane season for both the period 1950-2007 and 1980-2007 got longer by 5 to 10 days per decade (see my blog post on the paper.)


Figure 2. MODIS satellite image of 92L taken on June 6, 2013. Image credit: NASA.

Invest 92L in the Central Atlantic headed towards the Lesser Antilles
Satellite images show that a large and unusually well-organized tropical wave for so early in the season has developed in the Central Atlantic, midway between Africa and the Lesser Antilles Islands. The wave has a modest degree of spin and heavy thunderstorms. NHC designated this system 92L Thursday afternoon. High wind shear of 20 - 25 knots is ripping up the thunderstorms in 92L as they form, though, and wind shear is predicted to increase to 30 - 40 knots Thursday night through Monday, making development unlikely. The wave will likely bring heavy rain showers and gusty winds to the northern Lesser Antilles Islands beginning on Sunday night.

Jeff Masters

Street Flooding from Andrea (VarietyWorkshopRkstr)
Tropical Storm Andrea dumps rains in Treasure Island/St. Pete Beach, Fla., leaves street flooding behind.
Street Flooding from Andrea
Tropical Storm Andrea churns things up at Clearwater Beach, Fla.
Surf's Up!

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Interesting ridge setup....



marked in red.
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The atmosphere pattern is not good for 92L also!!!No way
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Quoting beell:



A GFS model out 12 days that shows a 1008 low in the Gulf off Mexico means we have a TS headed into Texas and Louisiana? At some point, these models really do get off into la-la land somewhere.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting TylerStanfield:

Chris 2006? Is that the one that Split in half overnight.

Yes...
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Quoting Tazmanian:
when we have name storms out there i would watch more on what we post and do in here be for you no it you could have a 24hr ban in no time from the admins when things get really going out there the admins will realy start watching the blog more

Taz, you are so correct. Things were a little slow and I posted a couple of things that weren't really weather related. I certainly know better when things heat up since I'm one of the ones that comes here for information and hate when people post items that are not weather related myself. Good to see you are still here for another exciting weather watching session.
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Quoting sar2401:

Those dang links aren't working again, Brian. Just when you thought you had it all figured out too...:-)


When I link to the advisories themselves it doesn't work. It works when I link to the advisory archive. I don't know why. I did change them and they work now.
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Well we ended up with just over 4.5 inches here. The brings my 5 day total to a little over 9 inches. From feast to famine. We've had more rain in the last 5 days than our pathetic previous year to date through May of only 5.6 inches.

I'm very thankful the rainy season is reliable here after going through really dry periods like we had for a while this Spring. Yes some years are drier and some wetter but overall its reliable. I


Overall I'd say Andrea satisfied my expectations locally quite well. The convective bands were very strong at times, if Andrea hadn't have picked up and rocketed away. Rainfall amounts could have been much higher in the range of 8 to 12 in many spots.
We had some exciting squalls and lots of rain. Except for the tornadoes, Andrea was mostly fun and beneficial to the ecosystem.
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Quoting CybrTeddy:


Maybe it's not "epic Floridian" rain fall, but it sure filled up the pound in my back yard pretty quick. And the average thunderstorm in FL produces 1"-2" per hour, the stronger ones 3"-5".


Remember that rainfall rate means the rate at which rain would accumulate to if it fell that hard for one hour. Many of these squalls today had blinding downpours with extremely high rainfall rates as if always the case with tropical cyclones due the their nature of having extremely high concentrations of moisture in the atmosphere. However, many of these convective cells last 5 to 10 minutes at best. Rainfall rates in the stronger cells were producing 6 inch an hour rain rates...


The main feeder bands just raced through the area hence rainfall of 2 to 4 inches with some spots getting 5 or 6 was where things were kept at.

I've noticed though that tropical systems always bring the greatest flooding around here when it comes to rise in water of creeks and lakes. It's likely due to the very intense bursts of rain in convection.
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The center seems to be near Hilliard.

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340. beell
Quoting sar2401:

No, it doesn't. It shows a possible storm that's going to affect the Bahamas...maybe. Do you have a link which shows your storm?




Do you have a link for a storm in the Bahamas?
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Quoting CybrTeddy:
Axed.




i have too admin it 92L is fighting the shear good so far
Member Since: May 21, 2006 Posts: 5091 Comments: 115437
Quoting Andrebrooks:
Link

First, it's a user's blog, not a model
Second, Levi never mentions the GFS, only the CMC
Third, he only mentions an outside chance of low forming in the Gulf that would head toward Florida, not Texas and Louisiana

Seriously, stop spamming the blog with these kinds of posts.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
when we have name storms out there i would watch more on what we post and do in here be for you no it you could have a 24hr ban in no time from the admins when things get really going out there the admins will realy start watching the blog more
Member Since: May 21, 2006 Posts: 5091 Comments: 115437
Quoting CybrTeddy:
Axed.

Chris 2006? Is that the one that Split in half overnight.
Member Since: June 2, 2013 Posts: 8 Comments: 1386
Link
Quoting sar2401:

No, it doesn't. It shows a possible storm that's going to affect the Bahamas...maybe. Do you have a link which shows your storm?
Member Since: March 25, 2013 Posts: 30 Comments: 1340
Quoting BaltimoreBrian:
Andrea's 11 p.m. public advisory

Andrea's 11 p.m. NHC discussion

Those dang links aren't working again, Brian. Just when you thought you had it all figured out too...:-)
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting opal92nwf:
Really!?

This is just crazy talk. GFS is suffering heat stroke or something.
I hadn't even starting looking at all the data yet on a regular basis. Let alone the trade winds and jet stream. I guess I'm going to have to start paying close attention already.
Speaking of, I appreciate all the updates everyone posted for TS Andrea throughout the track, from the first we have a blob to this is almost going to get to Hurricane strength.
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Axed.
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Quoting Andrebrooks:
Did ya'll see the 18Z run of the GFS,SHOWS A POSSIBLE STORM IN THE WESTERN GULF AFFECTING TEXAS AND LOUISIANA.

No, it doesn't. It shows a possible storm that's going to affect the Bahamas...maybe. Do you have a link which shows your storm?
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting sar2401:

Uh-oh, it's the GFS. Really, I think 92L has a chance to make the bright lights. After watching Andrea, I'm not discounting any possibilities now.

I feel the same way as you do. I am traveling tomorrow to stay in Homestead, FL for the next month...I think that this is going to be a very interesting season...
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Did ya'll see the 18Z run of the GFS,SHOWS A POSSIBLE STORM IN THE WESTERN GULF AFFECTING TEXAS AND LOUISIANA.
Member Since: March 25, 2013 Posts: 30 Comments: 1340
Quoting sar2401:

I wouldn't count 5" in Florida as "epic" rainfall. The last time I was in Tampa, it seemed like we got 5" almost every day.


Maybe it's not "epic Floridian" rain fall, but it sure filled up the pound in my back yard pretty quick. And the average thunderstorm in FL produces 1"-2" per hour, the stronger ones 3"-5".
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Quoting AtHomeInTX:


It's about to get nasty hot around here next week. Especially with the gulf heating up. Yuck!




But look at that water temperature! I want to go diving. The high at my house in SE Alabama was 78 today. I don't know what the record low maximum is but we had to be close. My high two days ago was 99.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting BaltimoreBrian:


The pressure was 993 mb at landfall, deepened to 992 mb at 8 pm EDT and is 993 again. Andrea is becoming more baroclinic and less tropical looking with every satellite frame.

Thanks mate!
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Quoting opal92nwf:
Really!?


look like overall tracks iam expecting this season.
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Quoting opal92nwf:
Really!?

Uh-oh, it's the GFS. Really, I think 92L has a chance to make the bright lights. After watching Andrea, I'm not discounting any possibilities now.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting AussieStorm:
Afternoon all. How is everyone dealing with Andrea? 10 Tornadoes and 4'5 storm surge.

What was Andrea's minimum pressure at landfall?
Last night before I went to bed she was 997mb.


The pressure was 993 mb at landfall, deepened to 992 mb at 8 pm EDT and is 993 again. Andrea is becoming more baroclinic and less tropical looking with every satellite frame.
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Quoting BahaHurican:
Hey, zoo.
That's how we were getting it the last 10 days... I'm glad for the cloud cover and breeze that have been keeping temps and humidity down, but gladder the rain has stopped.


It's about to get nasty hot around here next week. Especially with the gulf heating up. Yuck!



Member Since: August 24, 2010 Posts: 0 Comments: 253
Quoting WhereIsTheStorm:


Try downtown Charleston. They don't need speed limits if you go to fast your car falls apart. Just kidding Presslord; but close.

Oh, yeah, I forgot about downtown Charleston. The city motto, as I understand it, is "Enjoy yourself - all traffic control devices are merely suggestions". :-)
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Really!?
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Quoting Stoopid1:


1.55" today according to KCRG(nearest airport). Kinda lucked out here in Jax.

Kinda my point. I think Andrea is going to be a nice rainmaker for thse that need it but it's not going to be a dangerous storm. I'm not the one using the word "dangerous". The graphic said "Dangerous Flooding Threat". I don't believe that to be true, especially from 3" to 5" of rain.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
0.5 degrees north and 0.6 degrees east between 8 and 11 p.m.
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Quoting spathy:
I didnt think so.
Thanks for the following of rules. Wunder admin.

You are correct; but to the weather.
I'm still amazed that this TS developed this early from a storm that formed in the Pacific and made it across Mexico to develop in the GOM, especially with all the shear it encountered.
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Quoting OceanMoan:



And that is the reason I avoid driving in downtown Charleston as much as possible. :-)

I know; but it's such a great historic area.
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Down to 45 mph, up to 993 mb.
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Quoting WhereIsTheStorm:


Try downtown Charleston. They don't need speed limits if you go to fast your car falls apart. Just kidding Presslord; but close.



And that is the reason I avoid driving in downtown Charleston as much as possible. :-)
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Afternoon all. How is everyone dealing with Andrea? 10 Tornadoes and 4'5 storm surge.

What was Andrea's minimum pressure at landfall?
Last night before I went to bed she was 997mb.
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Quoting Thrawst:


Hmm, may have not been, but it was indeed rotating.

Maybe a rotating wall cloud but the rest looks like scud in the picture. Anyway, I'm glad it wasn't a funnel headed right for you. I imagine 45 stories up doesn't count as a good tornado shelter.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting sar2401:

Sure it counts. How much rain have you had? I had five inches in the last two day in Alabama without a tropical storm. I was thinking of the supposed 15-20" forecast of several days ago.


1.55" today according to KCRG(nearest airport). Kinda lucked out here in Jax.
Member Since: August 6, 2007 Posts: 24 Comments: 2755
Quoting OceanMoan:



Really? I hadn't noticed, seems normal to me. (kidding)


Try downtown Charleston. They don't need speed limits if you go to fast your car falls apart. Just kidding Presslord; but close.
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Quoting Stoopid1:


Not sure where the festive mood came from but I ain't complaining.

Starting to



I love Master Shake!
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Quoting CybrTeddy:
"Andrea has not turned out to be an epic rainmaker anywhere."

Except of course.. if you live in Florida. I got a good 5" of rain today.

I wouldn't count 5" in Florida as "epic" rainfall. The last time I was in Tampa, it seemed like we got 5" almost every day.
Member Since: October 2, 2004 Posts: 0 Comments: 16976
Quoting Thrawst:


Hmm, may have not been, but it was indeed rotating.


It is actually harder to see one of these small tornadoes in FL into it actually touches down and the sand comes up. Seen many come down out of the cloud and go back up without ever touching anything. Great shots though. Thanks for sharing.
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Quoting sar2401:

Also an almost complete lack of street lights...and I mean anywhere. I don't know if the people of South Carolina don't like lights or hate paying electric bills but driving on a freeway in South Carolina at night with poor visibility is downright dangerous. The fact that most of the off ramps only have one sign marking them only makes things worse. Oh, and the paving. Man, talk about getting fillings knocked loose. I felt like I was in a third world country...and that's before I saw Pedro. :-)



Really? I hadn't noticed, seems normal to me. (kidding)
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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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