Alert archive / Mississippi / Tornado Watches in 2007

Tornado Watch 19

February 13, 200712 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 24 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Feb 13, 2007, 2:43 AM CST for 12 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 24 counties in Mississippi. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued
Feb 13, 2007, 2:43 AM CST (08:43 UTC)
Expired
Feb 13, 2007, 12:45 PM CST
In force
10 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 39 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 87 km from the middle of the area, began a volume at 08:42 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
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 13, 3:00 AM CSTSevere Thunderstorm WarningJANRankin, Simpson45 min
Feb 13, 3:33 AM CSTSevere Thunderstorm WarningJANLawrence, Lincoln42 min
Feb 13, 3:39 AM CSTSevere Thunderstorm WarningJANScott, Smith36 min
Feb 13, 3:48 AM CSTTornado WarningJANScott, Smith27 min
Feb 13, 3:54 AM CSTTornado WarningLIXPearl River36 min
Feb 13, 4:07 AM CSTSevere Thunderstorm WarningJANJefferson Davis, Marion38 min
Feb 13, 4:15 AM CSTTornado WarningJANJefferson Davis27 min
Feb 13, 4:35 AM CSTTornado WarningJANForrest55 min
Feb 13, 4:36 AM CSTTornado WarningLIXPearl River24 min
Feb 13, 4:54 AM CSTTornado WarningMOBStone36 min
Feb 13, 4:58 AM CSTSevere Thunderstorm WarningJANMarion37 min
Feb 13, 5:15 AM CSTSevere Thunderstorm WarningMOBWayne45 min
Feb 13, 5:20 AM CSTSevere Thunderstorm WarningJANClarke40 min
Feb 13, 5:27 AM CSTSevere Thunderstorm WarningJANLamar33 min
Feb 13, 5:32 AM CSTTornado WarningMOBPerry43 min
Feb 13, 5:34 AM CSTTornado WarningLIXHancock, Harrison26 min
Feb 13, 5:46 AM CSTSevere Thunderstorm WarningJANForrest29 min
Feb 13, 6:15 AM CSTTornado WarningMOBGreene, Perry60 min
Feb 13, 6:27 AM CSTTornado WarningLIXHarrison63 min
Feb 13, 6:49 AM CSTSevere Thunderstorm WarningMOBWashington56 min
Feb 13, 7:04 AM CSTTornado WarningLIXJackson41 min
Feb 13, 7:16 AM CSTSevere Thunderstorm WarningMOBMobile44 min
Feb 13, 7:17 AM CSTSevere Thunderstorm WarningLIXHarrison28 min
Feb 13, 7:31 AM CSTTornado WarningLIXJackson29 min
Feb 13, 7:53 AM CSTSevere Thunderstorm WarningMOBMobile67 min
Feb 13, 8:53 AM CSTSevere Thunderstorm WarningMOBBaldwin52 min
Feb 13, 9:56 AM CSTSevere Thunderstorm WarningMOBSanta Rosa34 min
Feb 13, 11:15 AM CSTSevere Thunderstorm WarningMOBOkaloosa30 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.7 hours before the alert went out and 142 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, Slidell Radar S, LA at 00:00Z on 2007-02-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Slidell Radar S, LA at 00:00Z on 2007-02-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
807 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
145 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.

000
WWUS20 KWNS 130843
SEL9  
SPC WW 130843
ALZ000-FLZ000-MSZ000-CWZ000-131700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 19
NWS STORM PREDICTION CENTER NORMAN OK
245 AM CST TUE FEB 13 2007

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

       SOUTHWEST ALABAMA
       WESTERN FLORIDA PANHANDLE
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING FROM 245 AM UNTIL 1100 AM CST.

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 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 5 MILES WEST SOUTHWEST OF MC
COMB MISSISSIPPI TO 25 MILES NORTHEAST OF CRESTVIEW FLORIDA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 18...

DISCUSSION...SEVERE THUNDERSTORMS INCLUDING SUPERCELLS CONTINUE TO
DEVELOP EWD ACROSS SRN LA INTO SRN MS WITH APPROACH OF UPPER TROUGH.
 WARM FRONT MOVING INLAND ACROSS WATCH AREA WITH AIR MASS BECOMING
SUFFICIENTLY UNSTABLE TO SUPPORT TORNADOS WITH SUPERCELLS THAT
DEVELOP GIVEN FAVORABLE SHEAR PROFILES IN PLACE.

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
500. MEAN STORM MOTION VECTOR 24035.


...HALES

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 13, 2:05 AM CSTMesoscale DiscussionSPCMobile, Washington55 min
Feb 13, 4:50 AM CSTMesoscale DiscussionSPCDallas, Greene, Hale, Marengo, Perry, Sumter85 min
Feb 13, 5:26 AM CSTMesoscale DiscussionSPCMobile, Washington94 min
Feb 13, 7:24 AM CSTMesoscale DiscussionSPCBaldwin, Conecuh, Escambia, Mobile, Monroe96 min
Feb 13, 9:07 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston7 hr
Feb 13, 11:03 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion87 min
Feb 13, 12:08 PM CSTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston67 min
Feb 13, 12:49 PM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 21 more6 hr
Feb 13, 5:09 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Butler, Chilton and 21 more96 min
Feb 13, 5:18 PM CSTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 29 more4 hr
Feb 13, 8:52 AM CSTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more53 min
Feb 13, 10:17 AM CSTMesoscale DiscussionSPCCharlotte, DeSoto, Hardee, Hernando, Hillsborough, Lee and 5 more88 min
Feb 13, 11:54 AM CSTSevere Thunderstorm WatchSPCBrevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more5 hr
Feb 13, 2:15 PM CSTMesoscale DiscussionSPCBrevard, Flagler, Glades, Hardee, Highlands, Indian River and 8 more60 min
Feb 13, 2:34 PM CSTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 5 more5 hr
Feb 12, 6:27 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more2 hr
Feb 12, 9:38 PM CSTMesoscale DiscussionSPCAcadia, Allen, Assumption, Avoyelles, Beauregard, Calcasieu and 16 more97 min
Feb 12, 10:39 PM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 30 more7 hr
Feb 13, 2:26 AM CSTMesoscale DiscussionSPCAscension, Assumption, Lafourche, Livingston, Orleans, Saint Charles and 5 more64 min

Nearby

Tornado Watches in Mississippi, 2007Tornado Watches in Alabama, 2007Tornado Watches in Florida, 2007Every tornado watch in 2007

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.