Alert archive / Mississippi / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 145

May 1, 200413 counties in Alabama; Washington Parish, Louisiana; 18 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2004, 4:00 PM CDT for 13 counties in Alabama; Washington Parish, Louisiana; 18 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2004, 4:00 PM CDT (21:00 UTC)
Expired: May 1, 2004, 9:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 32 counties

Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 113 km from the middle of the area, began a volume at 21:04 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 1, 4:01 PM CDT	Tornado Warning	JAN	Lawrence	44 min
May 1, 4:02 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	43 min
May 1, 4:13 PM CDT	Severe Thunderstorm Warning	JAN	Smith	57 min
May 1, 4:18 PM CDT	Severe Thunderstorm Warning	JAN	Simpson	57 min
May 1, 4:25 PM CDT	Tornado Warning	JAN	Covington, Jefferson Davis, Lawrence	60 min
May 1, 4:47 PM CDT	Tornado Warning	JAN	Jasper, Smith	58 min
May 1, 5:51 PM CDT	Severe Thunderstorm Warning	JAN	Clarke	44 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

Jackson, MS (KJAN), launched 12:00Z, 9.0 hours before the alert went out and 156 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: 1278 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 16 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
May 1, 6:47 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 42 more	88 min
Apr 30, 11:56 PM CDT	Mesoscale Discussion	SPC	Beauregard, Calcasieu, Cameron, Jefferson Davis	94 min
May 1, 12:50 AM CDT	Severe Thunderstorm Watch	SPC	Bossier, Caddo	6 hr
May 1, 2:38 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 10 more	37 min
May 1, 3:10 AM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Claiborne, De Soto, Jackson, Lincoln and 7 more	6 hr
May 1, 5:13 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 6 more	92 min
May 1, 7:24 AM CDT	Mesoscale Discussion	SPC	Natchitoches, Sabine, Winn	96 min
May 1, 9:45 AM CDT	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis, Vernon	5 hr
May 1, 1:45 PM CDT	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena, Saint Tammany and 3 more	3 hr

Nearby

Severe Thunderstorm Watches in Mississippi, 2004 Severe Thunderstorm Watches in Alabama, 2004 Severe Thunderstorm Watches in Louisiana, 2004 Every severe thunderstorm watch in 2004

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.