Alert archive / Georgia / Severe Thunderstorm Watches in 2009

Severe Thunderstorm Watch 98

March 31, 20094 states

The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2009, 1:05 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Mar 31, 2009, 1:05 PM CDT (18:05 UTC)
Expired: Mar 31, 2009, 9:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 71 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Eglin Afb radar (KEVX), 106 km from the middle of the area, began a volume at 18:09 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: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Mar 31, 1:10 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	50 min
Mar 31, 1:25 PM CDT	Tornado Warning	MOB	Baldwin, Escambia	65 min
Mar 31, 1:35 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	42 min
Mar 31, 1:42 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	44 min
Mar 31, 2:03 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	42 min
Mar 31, 2:13 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	47 min
Mar 31, 2:41 PM CDT	Flash Flood Warning	MOB	Baldwin, Mobile	6 hr
Mar 31, 2:45 PM CDT	Severe Thunderstorm Warning	MOB	Santa Rosa	37 min
Mar 31, 2:56 PM CDT	Flash Flood Warning	MOB	Covington, Escambia	6 hr
Mar 31, 3:02 PM CDT	Tornado Warning	MOB	Okaloosa, Santa Rosa	31 min
Mar 31, 3:15 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	45 min
Mar 31, 3:26 PM CDT	Severe Thunderstorm Warning	TAE	Holmes, Walton	64 min
Mar 31, 3:31 PM CDT	Tornado Warning	MOB	Okaloosa	13 min
Mar 31, 3:34 PM CDT	Tornado Warning	TAE	Walton	41 min
Mar 31, 3:51 PM CDT	Tornado Warning	TAE	Baker, Mitchell	39 min
Mar 31, 4:01 PM CDT	Severe Thunderstorm Warning	TAE	Berrien, Irwin	29 min
Mar 31, 4:07 PM CDT	Tornado Warning	TAE	Houston	38 min
Mar 31, 4:12 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Holmes, Walton, Washington	48 min
Mar 31, 4:27 PM CDT	Tornado Warning	TAE	Colquitt, Mitchell	48 min
Mar 31, 4:29 PM CDT	Severe Thunderstorm Warning	TAE	Colquitt, Tift, Worth	46 min
Mar 31, 4:50 PM CDT	Tornado Warning	TAE	Jackson	25 min
Mar 31, 5:04 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Jackson, Washington	41 min
Mar 31, 5:13 PM CDT	Severe Thunderstorm Warning	MOB	Greene, Perry	35 min
Mar 31, 5:17 PM CDT	Severe Thunderstorm Warning	TAE	Berrien, Colquitt, Cook, Tift, Worth	43 min
Mar 31, 5:22 PM CDT	Tornado Warning	TAE	Colquitt, Cook, Tift	23 min
Mar 31, 5:28 PM CDT	Tornado Warning	TAE	Calhoun, Jackson, Liberty	47 min
Mar 31, 5:30 PM CDT	Severe Thunderstorm Warning	MOB	Washington	21 min
Mar 31, 5:39 PM CDT	Tornado Warning	MOB	Escambia	20 min
Mar 31, 5:43 PM CDT	Tornado Warning	TAE	Colquitt, Cook	26 min
Mar 31, 5:44 PM CDT	Flash Flood Warning	TAE	Berrien, Brooks, Colquitt, Cook, Thomas, Tift	46 min
Mar 31, 5:54 PM CDT	Flash Flood Warning	TAE	Gadsden, Leon, Liberty	51 min
Mar 31, 5:57 PM CDT	Severe Thunderstorm Warning	TAE	Brooks, Lowndes, Thomas	48 min
Mar 31, 6:31 PM CDT	Severe Thunderstorm Warning	TAE	Lanier, Lowndes	44 min
Mar 31, 6:34 PM CDT	Flash Flood Warning	TAE	Jefferson, Leon	41 min
Mar 31, 6:34 PM CDT	Tornado Warning	TAE	Madison, Taylor	41 min
Mar 31, 7:37 PM CDT	Tornado Warning	TAE	Madison	23 min
Mar 31, 8:51 PM CDT	Severe Thunderstorm Warning	MOB	Stone	39 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 12:00Z, 6.1 hours before the alert went out and 261 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2169 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 31, 11:32 AM CDT	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Mobile, Washington	88 min
Mar 31, 11:54 AM CDT	Mesoscale Discussion	SPC	Sumter	96 min
Mar 31, 3:15 PM CDT	Mesoscale Discussion	SPC	Coffee, Covington, Dale, Escambia, Geneva, Henry and 1 more	90 min
Mar 31, 5:12 PM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Coffee, Conecuh, Covington, Dale and 7 more	93 min
Mar 31, 4:17 PM CDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Nassau and 2 more	28 min
Mar 31, 4:25 PM CDT	Severe Thunderstorm Watch	SPC	Baker, Columbia, Duval, Gilchrist, Hamilton, Nassau and 2 more	7 hr
Mar 31, 6:59 PM CDT	Mesoscale Discussion	SPC	Baker, Columbia, Hamilton, Jefferson, Lafayette, Leon and 5 more	91 min
Mar 31, 8:58 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Avoyelles, Catahoula, Concordia and 19 more	92 min
Mar 31, 9:37 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more	7 hr
Mar 31, 2:44 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 37 more	91 min

Nearby

Severe Thunderstorm Watches in Georgia, 2009 Severe Thunderstorm Watches in Florida, 2009 Severe Thunderstorm Watches in Alabama, 2009 Every severe thunderstorm 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.