Alert archive / Alabama / Tornado Watches in 2013

Tornado Watch 18

January 30, 201340 counties in Alabama; 5 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Jan 30, 2013, 5:15 AM CST for 40 counties in Alabama; 5 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jan 30, 2013, 5:15 AM CST (11:15 UTC)
Expired
Jan 30, 2013, 12:23 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 45 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Birmingham radar (KBMX), 116 km from the middle of the area, began a volume at 11:15 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
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jan 30, 7:29 AM CSTSevere Thunderstorm WarningMOBChoctaw46 min
Jan 30, 7:53 AM CSTSevere Thunderstorm WarningBMXChilton, Coosa52 min
Jan 30, 8:00 AM CSTSevere Thunderstorm WarningBMXHale, Marengo45 min
Jan 30, 8:15 AM CSTTornado WarningBMXCoosa, Talladega45 min
Jan 30, 8:46 AM CSTSevere Thunderstorm WarningBMXTalladega29 min
Jan 30, 9:02 AM CSTSevere Thunderstorm WarningBMXCalhoun28 min
Jan 30, 9:03 AM CSTSevere Thunderstorm WarningMOBChoctaw, Clarke, Washington42 min
Jan 30, 9:08 AM CSTTornado WarningBMXCalhoun52 min
Jan 30, 9:20 AM CSTTornado WarningBMXCleburne40 min
Jan 30, 10:09 AM CSTSevere Thunderstorm WarningBMXAutauga, Coosa, Elmore51 min
Jan 30, 10:12 AM CSTFlash Flood WarningBMXTalladega3 hr
Jan 30, 10:20 AM CSTFlash Flood WarningBMXCalhoun, St. Clair3 hr
Jan 30, 10:24 AM CSTSevere Thunderstorm WarningBMXElmore, Montgomery51 min
Jan 30, 10:31 AM CSTSevere Thunderstorm WarningBMXClay, Randolph44 min
Jan 30, 10:42 AM CSTFlash Flood WarningBMXClay, Cleburne3 hr
Jan 30, 10:53 AM CSTSevere Thunderstorm WarningBMXClay, Tallapoosa37 min
Jan 30, 10:54 AM CSTFlash Flood WarningMOBChoctaw, Clarke, Washington6 hr
Jan 30, 10:57 AM CSTSevere Thunderstorm WarningBMXTallapoosa33 min
Jan 30, 11:08 AM CSTSevere Thunderstorm WarningBMXCleburne, Randolph37 min
Jan 30, 11:19 AM CSTSevere Thunderstorm WarningBMXElmore, Tallapoosa26 min
Jan 30, 11:26 AM CSTSevere Thunderstorm WarningBMXChambers, Randolph49 min
Jan 30, 12:10 PM CSTTornado WarningBMXBullock, Montgomery, Pike35 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

Birmingham, AL (KBMX), launched 00:00Z, 11.3 hours before the alert went out and 117 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, Birmingham, AL at 00:00Z on 2013-01-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 216 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, Birmingham, AL at 00:00Z on 2013-01-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 254 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
216 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
770 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
254 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

569 
WWUS20 KWNS 301114
SEL8  
SPC WW 301114
ALZ000-MSZ000-301900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 18
NWS STORM PREDICTION CENTER NORMAN OK
515 AM CST WED JAN 30 2013

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

       SOUTHWEST THROUGH NORTHEAST ALABAMA
       FAR SOUTHEAST MISSISSIPPI

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 515 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 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES WEST SOUTHWEST OF
EVERGREEN ALABAMA TO 20 MILES NORTHEAST OF GADSDEN ALABAMA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 14...WW 15...WW 16...WW
17...

DISCUSSION...PRE-SQUALL LINE CONVECTION HAS GRADUALLY INTENSIFIED
OVER THE PAST HOUR WITH LIGHTNING NOW OBSERVED OVER CNTRL AL.  GIVEN
THE MOIST AND STRONGLY SHEARED ENVIRONMENT...POTENTIAL WILL EXIST
FOR SUPERCELLS CAPABLE OF TORNADOES AND DAMAGING WINDS.

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 22040.


...MEAD

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 29, 9:49 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lauderdale116 min
Jan 30, 1:31 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 17 more29 min
Jan 30, 1:46 AM CSTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more8 hr
Jan 30, 4:27 AM CSTMesoscale DiscussionSPCMobile, Washington93 min
Jan 30, 5:01 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 26 more29 min
Jan 30, 7:43 AM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 36 more62 min
Jan 30, 10:09 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Cleburne, Crenshaw and 9 more96 min
Jan 30, 11:50 AM CSTMesoscale DiscussionSPCBullock, Chambers, Elmore, Lee, Macon, Montgomery and 3 more85 min
Jan 30, 12:19 PM CSTTornado WatchSPCBarbour, Bullock, Butler, Chambers, Coffee, Conecuh and 16 more9 hr
Jan 30, 4:51 AM CSTTornado WatchSPCBartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 8 more7 hr
Jan 30, 6:38 AM CSTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 7 more97 min
Jan 30, 7:11 AM CSTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more7 hr
Jan 30, 3:13 PM CSTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Colquitt, Columbia, Crisp and 32 more2 hr
Jan 30, 4:31 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brooks and 34 more59 min
Jan 30, 4:45 PM CSTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 71 more6 hr
Jan 29, 7:31 PM CSTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, DeSoto and 26 more119 min
Jan 29, 8:11 PM CSTMesoscale DiscussionSPCBolivar, Coahoma, Issaquena, Sharkey, Sunflower, Tunica and 1 more94 min
Jan 29, 10:07 PM CSTTornado WatchSPCAdams, Alcorn, Attala, Benton, Calhoun, Carroll and 37 more6 hr
Jan 30, 3:03 AM CSTMesoscale DiscussionSPCAdams, Alcorn, Attala, Benton, Calhoun, Carroll and 41 more57 min
Jan 30, 3:45 AM CSTTornado WatchSPCAttala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more4 hr

Nearby

Tornado Watches in Alabama, 2013Tornado Watches in Mississippi, 2013Every tornado watch in 2013

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.