Alert archive / Florida / Tornado Watches in 2009

Tornado Watch 85

March 28, 20095 counties in Alabama; 10 counties in Florida; 4 counties in Georgia

The Storm Prediction Center issued this tornado watch at Mar 28, 2009, 1:17 AM CDT for 5 counties in Alabama; 10 counties in Florida; 4 counties in Georgia. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Mar 28, 2009, 1:17 AM CDT (06:17 UTC)
Expired
Mar 28, 2009, 4:53 AM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt

Counties Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Early County, GA, Miller County, GA, Seminole County, GA

The radar

The Eglin Afb radar (KEVX), 48 km from the middle of the area, began a volume at 06:19 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
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 28, 1:38 AM CDTSevere Thunderstorm WarningTAEHolmes, Walton39 min
Mar 28, 1:59 AM CDTSevere Thunderstorm WarningTAEGeneva31 min
Mar 28, 4:32 AM CDTSevere Thunderstorm WarningTAECoffee, Dale28 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 00:00Z, 6.3 hours before the alert went out and 138 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 00:00Z on 2009-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 00:00Z on 2009-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1088 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

943 
WWUS20 KWNS 280618
SEL5  
SPC WW 280618
ALZ000-FLZ000-GAZ000-CWZ000-281300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 85
NWS STORM PREDICTION CENTER NORMAN OK
120 AM CDT SAT MAR 28 2009

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

       FAR SOUTHEAST ALABAMA
       FLORIDA PANHANDLE
       FAR SOUTHWEST GEORGIA
       COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING FROM 120 AM UNTIL 800 AM CDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF
DOTHAN ALABAMA TO 30 MILES SOUTH OF PANAMA CITY FLORIDA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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...CONTINUE...WW 82...WW 83...WW 84...

DISCUSSION...SEVERE THUNDERSTORMS WILL SPREAD GENERALLY EWD ACROSS
WW THROUGH THE NIGHT AS AIR MASS DESTABILIZES WITH INCREASING SLY
LOW LEVEL FLOW OFF OF THE GULF OF MEXICO.  SHEAR WILL REMAIN MORE
THAN ADEQUATE FOR SUPERCELLS...WITH STEEP LAPSE RATES FOSTERING
LARGE HAIL POTENTIAL.  ISOLATED TORNADO/WIND DAMAGE THREAT IS ALSO
POSSIBLE GIVEN VERY STRONG LOW LEVEL SHEAR AND CONTINUED
MOISTENING/DESTABILIZATION OF THE BOUNDARY LAYER OVERNIGHT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 25035.


...EVANS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 27, 8:21 PM CDTMesoscale DiscussionSPCBaldwin, Escambia, Mobile, Washington84 min
Mar 27, 10:09 PM CDTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more9 hr
Mar 27, 11:51 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more84 min
Mar 28, 3:14 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more61 min
Mar 28, 4:25 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 45 more35 min
Mar 28, 4:50 AM CDTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 11 more5 hr
Mar 28, 4:59 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Calhoun, Chambers and 24 more3 hr
Mar 28, 6:48 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Coffee, Conecuh, Covington, Crenshaw and 6 more57 min
Mar 28, 9:20 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston8 hr
Mar 28, 12:58 PM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Jackson, Lauderdale, Lawrence and 5 more92 min
Mar 28, 2:23 PM CDTTornado WatchSPCCullman, DeKalb, Jackson, Lauderdale, Lawrence, Limestone and 3 more7 hr
Mar 28, 5:18 PM CDTMesoscale DiscussionSPCDeKalb, Jackson, Limestone, Madison, Marshall, Morgan57 min
Mar 28, 2:19 PM CDTMesoscale DiscussionSPCCalhoun, Franklin, Gadsden, Gulf, Hamilton, Jefferson and 5 more56 min
Mar 28, 10:51 AM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Bryan, Bulloch, Burke and 21 more54 min
Mar 28, 11:47 AM CDTTornado WatchSPCAppling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 22 more7 hr

Nearby

Tornado Watches in Florida, 2009Tornado Watches in Alabama, 2009Tornado Watches in Georgia, 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.