Alert archive / Georgia / Tornado Watches in 2009

Tornado Watch 76

March 27, 20098 counties in Florida; 9 counties in Georgia

The Storm Prediction Center issued this tornado watch at Mar 27, 2009, 11:05 AM EDT for 8 counties in Florida; 9 counties in Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Mar 27, 2009, 11:05 AM EDT (15:05 UTC)
Expired
Mar 27, 2009, 2:00 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt

Counties Dixie County, FL, Franklin County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Berrien County, GA, Brooks County, GA, Colquitt County, GA, Cook County, GA, Grady County, GA, Lanier County, GA, Lowndes County, GA, Mitchell County, GA, Thomas County, GA

The radar

The Tallahassee radar (KTLH), 51 km from the middle of the area, began a volume at 15:25 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Mar 27, 11:09 AM EDTSevere Thunderstorm WarningTAEGadsden, Jefferson, Leon, Wakulla51 min
Mar 27, 11:14 AM EDTTornado WarningTAEColquitt, Mitchell, Worth46 min
Mar 27, 11:25 AM EDTTornado WarningTAELeon, Wakulla50 min
Mar 27, 11:32 AM EDTTornado WarningTAEFranklin, Wakulla28 min
Mar 27, 12:09 PM EDTSevere Thunderstorm WarningTAEJefferson, Madison, Taylor51 min
Mar 27, 12:33 PM EDTSevere Thunderstorm WarningTAEJefferson, Madison57 min
Mar 27, 1:01 PM EDTSevere Thunderstorm WarningTAELafayette, Madison, Taylor44 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.1 hours before the alert went out and 49 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 2009-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 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 2009-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 230 square meters per square second.19395878Sfc1 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
31 J/kg
Mixed-layer CIN
-249 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
230 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

534 
WWUS20 KWNS 271458
SEL6  
SPC WW 271458
FLZ000-GAZ000-CWZ000-271800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 76
NWS STORM PREDICTION CENTER NORMAN OK
1100 AM EDT FRI MAR 27 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       FLORIDA BIG BEND
       SOUTHWEST GEORGIA
       COASTAL WATERS

EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1100 AM UNTIL
200 PM EDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF MOULTRIE
GEORGIA TO 45 MILES SOUTH SOUTHEAST OF TALLAHASSEE FLORIDA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 75. WATCH NUMBER 75 WILL NOT BE IN EFFECT AFTER 1100
AM EDT. 

DISCUSSION...WELL-DEVELOPED MCS/SQUALL LINE WILL CONTINUE EWD ACROSS
THE FL BIG BEND AND SW GA THE NEXT FEW HOURS.  SOME MOISTENING E OF
THE ONGOING STORMS SHOULD RESULT IN SUFFICIENT DESTABILIZATION TO
SUSTAIN THE THREAT FOR DAMAGING WINDS AND A COUPLE OF TORNADOES WITH
BOWING SEGMENTS IN THE LARGER SQUALL LINE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 27035.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 27, 12:53 AM EDTMesoscale DiscussionSPCEscambia97 min
Mar 27, 1:48 AM EDTTornado WatchSPCEscambia, Okaloosa, Santa Rosa7 hr
Mar 27, 3:23 AM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa67 min
Mar 27, 5:37 AM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more53 min
Mar 27, 6:02 AM EDTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more5 hr
Mar 27, 7:35 AM EDTMesoscale DiscussionSPCBay, Calhoun, Gulf, Holmes, Jackson, Okaloosa and 2 more55 min
Mar 27, 10:51 AM EDTMesoscale DiscussionSPCFranklin, Gadsden, Gulf, Jefferson, Leon, Liberty and 3 more24 min
Mar 27, 1:11 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Dixie and 12 more64 min

Nearby

Tornado Watches in Georgia, 2009Tornado Watches in Florida, 2009Every tornado watch 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.