Alert archive / Mississippi / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 640, NWS Jackson, MS

July 21, 2008Adams County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jul 21, 2008, 3:09 PM CDT for Adams County, Mississippi. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 21, 2008, 3:09 PM CDT (20:09 UTC)
Expired: Jul 21, 2008, 3:31 PM CDT
In force: 22 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

County Adams County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.2 hours before the alert went out and 209 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: 1586 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1186 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 10:45 AM CDT, 4 hours 24 minutes earlier.

Area forecast discussion, Jul 21, 10:45 AM CDT, 4 hours 24 minutes before

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Hazardous weather outlook, Jul 21, 2:26 PM CDT, 43 minutes before

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In the hours before

Special weather statement, Jul 21, 2:21 PM CDT, 48 minutes before

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Special weather statement, Jul 21, 2:58 PM CDT, 11 minutes before

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The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 3:05 PM CDT	Heat Advisory	JAN	Attala, Bolivar, Carroll, Choctaw, Clay, Grenada and 24 more	27 hr

Nearby

Severe Thunderstorm Warnings in Mississippi, 2008 Every severe thunderstorm warning 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.