Alert archive / Mississippi / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 119

April 3, 200718 counties in Alabama; 18 counties in Arkansas; 39 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2007, 9:53 PM CDT for 18 counties in Alabama; 18 counties in Arkansas; 39 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 3, 2007, 9:53 PM CDT (02:53 UTC)
Expired
Apr 4, 2007, 2:35 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 75 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 40 km from the middle of the area, began a volume at 02:55 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
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 3, 9:53 PM CDTSevere Thunderstorm WarningMEGMarshall37 min
Apr 3, 9:59 PM CDTSevere Thunderstorm WarningMEGAlcorn, Prentiss, Tippah46 min
Apr 3, 10:00 PM CDTSevere Thunderstorm WarningMEGDeSoto30 min
Apr 3, 10:29 PM CDTSevere Thunderstorm WarningLZKArkansas, Cleveland, Grant, Jefferson, Lincoln, Monroe61 min
Apr 3, 10:40 PM CDTSevere Thunderstorm WarningMEGLafayette, Marshall35 min
Apr 3, 11:25 PM CDTSevere Thunderstorm WarningLZKCalhoun50 min
Apr 3, 11:32 PM CDTSevere Thunderstorm WarningLZKDrew, Lincoln43 min
Apr 3, 11:38 PM CDTSevere Thunderstorm WarningLZKBradley, Cleveland37 min
Apr 3, 11:42 PM CDTSevere Thunderstorm WarningLZKDesha48 min
Apr 3, 11:53 PM CDTSevere Thunderstorm WarningJANBolivar52 min
Apr 3, 11:53 PM CDTSevere Thunderstorm WarningMEGLee37 min
Apr 3, 11:55 PM CDTSevere Thunderstorm WarningJANGrenada52 min
Apr 3, 11:56 PM CDTSevere Thunderstorm WarningBMXWalker64 min
Apr 4, 12:16 AM CDTSevere Thunderstorm WarningLZKBradley, Drew29 min
Apr 4, 12:21 AM CDTSevere Thunderstorm WarningMEGCalhoun, Chickasaw39 min
Apr 4, 12:27 AM CDTSevere Thunderstorm WarningMEGMonroe34 min
Apr 4, 12:40 AM CDTSevere Thunderstorm WarningJANBolivar, Sunflower, Washington50 min
Apr 4, 1:39 AM CDTSevere Thunderstorm WarningJANHumphreys51 min
Apr 4, 1:39 AM CDTSevere Thunderstorm WarningJANWinston51 min
Apr 4, 1:54 AM CDTSevere Thunderstorm WarningJANAttala, Holmes37 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

Little Rock, AR (KLZK), launched 00:00Z, 2.9 hours before the alert went out and 141 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, Little Rock, AR at 00:00Z on 2007-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2532 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, Little Rock, AR at 00:00Z on 2007-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 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
2532 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1366 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 8:03 PM CDTTornado WatchSPCColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more5 hr
Apr 3, 10:49 PM CDTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Lawrence, Madison, Marshall and 1 more56 min
Apr 4, 2:07 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Cleburne and 15 more113 min
Apr 3, 7:41 PM CDTMesoscale DiscussionSPCClark, Hempstead, Hot Spring, Howard, Little River, Pike and 1 more2 hr
Apr 3, 9:14 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 18 more61 min

Nearby

Severe Thunderstorm Watches in Mississippi, 2007Severe Thunderstorm Watches in Alabama, 2007Severe Thunderstorm Watches in Arkansas, 2007Every severe thunderstorm 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.