Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 289, NWS Tallahassee, FL

October 15, 2009Jefferson County, Madison County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Oct 15, 2009, 3:16 PM EDT for Jefferson County, Madison County, Florida. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 15, 2009, 3:16 PM EDT (19:16 UTC)
Expired
Oct 15, 2009, 3:49 PM EDT
In force
33 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

Counties Jefferson County, FL, Madison County, FL

The radar

The Tallahassee radar (KTLH), 62 km from the middle of the area, began a volume at 19:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.3 hours before the alert went out and 59 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2009-10-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1305 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2009-10-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1305 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
442 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.8
Supercell composite
5.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 15, 10:15 AM EDT, 5 hours 1 minute earlier.

Area forecast discussion, Oct 15, 10:15 AM EDT, 5 hours 1 minute before
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Hazardous weather outlook, Oct 15, 5:29 AM EDT, 9 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TALLAHASSEE FL
529 AM EDT THU OCT 15 2009

ALZ065>069-FLZ007>019-026>029-034-GAZ120>131-142>148-155>161-
GMZ730-750-755-765-770-775-160930-
COFFEE-DALE-HENRY-GENEVA-HOUSTON-INLAND WALTON-COASTAL WALTON-
HOLMES-WASHINGTON-JACKSON-BAY-CALHOUN-GULF-FRANKLIN-GADSDEN-LEON-
JEFFERSON-MADISON-LIBERTY-WAKULLA-TAYLOR-LAFAYETTE-DIXIE-QUITMAN-
CLAY-RANDOLPH-TERRELL-DOUGHERTY-LEE-WORTH-TURNER-TIFT-BEN HILL-
IRWIN-EARLY-MILLER-BAKER-MITCHELL-COLQUITT-COOK-BERRIEN-SEMINOLE-
DECATUR-GRADY-THOMAS-BROOKS-LOWNDES-LANIER-
APALACHEE BAY OR COASTAL WATERS FROM KEATON BEACH TO OCHLOCKONEE
RIVER FL OUT TO 20 NM-
COASTAL WATERS FROM APALACHICOLA TO DESTIN FL OUT 20 NM-
COASTAL WATERS FROM  OCHLOCKONEE RIVER TO APALACHICOLA FL OUT TO
20 NM-
COASTAL WATERS FROM  SUWANNEE RIVER TO KEATON BEACH OUT 20 NM-
WATERS FROM APALACHICOLA TO DESTIN FL FROM 20 TO 60 NM-
WATERS FROM  SUWANNEE RIVER TO APALACHICOLA FL FROM 20 TO 60 NM-
529 AM EDT THU OCT 15 2009 /429 AM CDT THU OCT 15 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ALABAMA...
SOUTHWEST AND SOUTH CENTRAL GEORGIA...AND THE FLORIDA BIG BEND
AND PANHANDLE...AND ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT...
A WEAK QUASI-STATIONARY FRONT NEAR THE FLORIDA-GEORGIA BORDER
COMBINED WITH A PASSING UPPER DISTURBANCE WILL FAVOR SHOWERS
ACROSS COASTAL FLORIDA AND THE COASTAL WATERS MAINLY THIS MORNING.
THEN...A STRONG COLD FRONT WILL MOVE SOUTHEAST AND APPROACH THE
FORECAST AREA BY THIS EVENING AND BEGIN TO MOVE ACROSS OVERNIGHT
INTO FRIDAY MORNING. ASSOCIATED SHOWERS AND THUNDERSTORMS WILL
SPREAD SOUTHWARD OVER THE AREA...ESPECIALLY AFTER LATE AFTERNOON
AND OVER SOUTHEAST ALABAMA AND ADJACENT GEORGIA AND FLORIDA.

ALTHOUGH WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED... SOME OF
THE STORMS ACCOMPANYING THIS COLD FRONT MAY BE STRONG WITH GUSTY
WINDS TO POSSIBLY SEVERE WITH DAMAGING WINDS THE GREATEST THREAT
...ESPECIALLY TONIGHT. WINDS AND SEAS WILL PICK UP AHEAD OF THE
SYSTEM AS WELL AND INCREASE SIGNIFICANTLY IN THE OFFSHORE FLOW
BEHIND IT. ADVISORY LEVEL CONDITIONS ARE CERTAINLY POSSIBLE
BEGINNING LATE TONIGHT AND CONTINUING INTO THE UPCOMING EARLY WORK
WEEK.

THERE IS A MODERATE RISK FOR RIP CURRENTS TODAY...ESPECIALLY WEST
OF MEXICO BEACH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
THE FRONT WILL EXIT SOUTHEAST INTO THE ADJACENT WATERS BY FRIDAY
LATE MORNING OR EARLY AFTERNOON. STRONG WEST TO NORTHWEST WINDS AND
INCREASING SEAS WILL GENERATE A MODERATE TO HIGH RISK OF RIP
CURRENTS ON FRIDAY ALONG WITH HAZARDOUS MARINE CONDITIONS. IN THE
WAKE OF THIS FRONT...NOTICEABLY COOLER AND DRIER AIR WILL BE FELT
THROUGH THE UPCOMING WEEKEND. HIGH TEMPERATURES FOR FRIDAY THROUGH
SUNDAY ARE FORECAST TO RANGE FROM AROUND 70 TO THE MID 70S EACH DAY.
LOW TEMPERATURES SHOULD DIP INTO THE UPPER 40S TO MID 50S OVER THE
WEEKEND AND MONDAY MORNING. TEMPERATURES WILL THEN BEGIN TO MODERATE
TO MORE SEASONAL LEVELS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED. HOWEVER SPOTTERS AND EMERGENCY
MANAGERS SHOULD MONITOR THE WEATHER ASSOCIATED WITH THIS COLD FRONT
AND REPORT ANY CONCERNS TO THE WEATHER SERVICE.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
WEBSITE ON THE INTERNET AT WEATHER.GOV...THEN CLICK ON YOUR AREA
OF INTEREST ON THE NATIONAL MAP.

BLOCK

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 15, 7:07 PM EDTSevere Thunderstorm WarningTAELee, Turner, Worth38 min
Oct 15, 7:45 PM EDTSevere Thunderstorm WarningTAELee, Turner, Worth45 min
Oct 15, 7:56 PM EDTTornado WarningTAETurner, Worth49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.