Alert archive / Alabama / Tornado Watches in 2008

Tornado Watch 62

February 17, 200820 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 5 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Feb 17, 2008, 5:26 AM CST for 20 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 5 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Feb 17, 2008, 5:26 AM CST (11:26 UTC)
Expired
Feb 17, 2008, 12:34 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 28 counties

Autauga County, AL, Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Greene County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 69 km from the middle of the area, began a volume at 11:26 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
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 17, 6:11 AM CSTSevere Thunderstorm WarningMOBGreene, Perry, Wayne49 min
Feb 17, 6:31 AM CSTSevere Thunderstorm WarningMOBWayne29 min
Feb 17, 7:00 AM CSTSevere Thunderstorm WarningMOBWashington45 min
Feb 17, 10:37 AM CSTTornado WarningMOBBaldwin38 min
Feb 17, 10:59 AM CSTSevere Thunderstorm WarningBMXBibb, Greene, Hale, Marengo, Perry, Tuscaloosa31 min
Feb 17, 11:03 AM CSTTornado WarningMOBChoctaw, Washington27 min
Feb 17, 11:11 AM CSTTornado WarningMOBBaldwin49 min
Feb 17, 11:13 AM CSTSevere Thunderstorm WarningBMXDallas, Hale, Marengo, Perry32 min
Feb 17, 11:24 AM CSTSevere Thunderstorm WarningBMXAutauga, Bibb, Chilton, Coosa, Dallas, Elmore and 8 more66 min
Feb 17, 11:25 AM CSTTornado WarningMOBClarke35 min
Feb 17, 11:30 AM CSTSevere Thunderstorm WarningMOBMobile60 min
Feb 17, 11:40 AM CSTTornado WarningBMXDallas, Marengo, Perry35 min
Feb 17, 11:46 AM CSTTornado WarningMOBBaldwin59 min
Feb 17, 11:58 AM CSTTornado WarningMOBClarke, Wilcox47 min
Feb 17, 12:08 PM CSTTornado WarningBMXAutauga, Chilton, Dallas, Perry52 min
Feb 17, 12:11 PM CSTTornado WarningBMXDallas, Marengo49 min
Feb 17, 12:28 PM CSTSevere Thunderstorm WarningBMXAutauga, Chilton, Clay, Cleburne, Coosa, Elmore and 5 more62 min
Feb 17, 12:29 PM CSTTornado WarningMOBEscambia61 min
Feb 17, 12:30 PM CSTSevere Thunderstorm WarningMOBBaldwin, Mobile45 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, 11.4 hours before the alert went out and 202 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 2008-02-17Temperature 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 2008-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.1939587897Sfc1 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
1066 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
292 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 171130
SEL2  
SPC WW 171130
ALZ000-FLZ000-MSZ000-CWZ000-171900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 62
NWS STORM PREDICTION CENTER NORMAN OK
530 AM CST SUN FEB 17 2008

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

       SOUTHERN AND CENTRAL ALABAMA
       WESTERN FLORIDA PANHANDLE
       SOUTHEAST MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 530 AM UNTIL 100
PM CST.

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 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHWEST OF
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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 61...

DISCUSSION...AIR MASS WILL CONTINUE TO MOISTEN THIS MORNING AIDING
IN SUFFICIENT DESTABILIZATION TO MAINTAIN EASTWARD MOVING SQUALL
LINE INTO SOUTHEASTERN MS...SOUTHWESTERN AL AND THE WRN FL
PANHANDLE.  INCREASING SLY LOW LEVEL WINDS COMBINED WITH STRONG FLOW
ALOFT WILL SUPPORT DEEP LAYER AND LOW LEVEL SHEAR FAVORABLE FOR
ROTATING UPDRAFTS AND AN ATTENDANT THREAT FOR ISOLATED TORNADOES AND
DAMAGING WIND.

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 400.
MEAN STORM MOTION VECTOR 23050.


...PETERS/CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 17, 2:13 AM CSTMesoscale DiscussionSPCMobile32 min
Feb 17, 4:19 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion, Pickens56 min
Feb 17, 5:05 AM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Dallas, Escambia and 8 more55 min
Feb 17, 7:13 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 16 more62 min
Feb 17, 9:43 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more62 min
Feb 17, 12:14 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Chambers, Clay, Coffee and 16 more91 min
Feb 17, 12:32 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 28 more7 hr
Feb 17, 2:45 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 22 more90 min
Feb 17, 5:19 PM CSTMesoscale DiscussionSPCChambers, Dale, Geneva, Henry, Houston86 min
Feb 17, 5:58 PM CSTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more8 hr
Feb 16, 7:18 PM CSTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Cameron, De Soto, Jefferson Davis and 4 more87 min
Feb 16, 8:25 PM CSTTornado WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more6 hr
Feb 16, 10:41 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 26 more94 min
Feb 16, 11:30 PM CSTSevere Thunderstorm WatchSPCAscension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 25 more6 hr
Feb 17, 1:33 AM CSTMesoscale DiscussionSPCAcadia, Allen, Cameron, Evangeline, Jefferson Davis, Rapides and 1 more57 min
Feb 17, 2:45 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more5 hr

Nearby

Tornado Watches in Alabama, 2008Tornado Watches in Mississippi, 2008Tornado Watches in Florida, 2008Every tornado watch in 2008

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.