Alert archive / Mississippi / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 191, NWS Jackson, MS

April 13, 2009Covington County, Lamar County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Apr 13, 2009, 7:34 PM CDT for Covington County, Lamar County, Mississippi. It was in force for 29 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: Apr 13, 2009, 7:34 PM CDT (00:34 UTC)
Expired: Apr 13, 2009, 8:03 PM CDT
In force: 29 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Covington County, MS, Lamar County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 105 km from the middle of the area, began a volume at 00:36 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 13, 4:16 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 0.6 hours before the alert went out and 113 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: 219 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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 Apr 13, 3:03 PM CDT, 4 hours 31 minutes earlier.

Area forecast discussion, Apr 13, 3:03 PM CDT, 4 hours 31 minutes before

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Hazardous weather outlook, Apr 13, 1:21 PM CDT, 6 hours 13 minutes before

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In the hours before

Special weather statement, Apr 13, 5:58 PM CDT, 1 hour 36 minutes before

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Special weather statement, Apr 13, 6:01 PM CDT, 1 hour 33 minutes before

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Local storm report, Apr 13, 6:28 PM CDT, 1 hour 6 minutes before

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Special weather statement, Apr 13, 6:35 PM CDT, 59 minutes before

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Local storm report, Apr 13, 6:53 PM CDT, 41 minutes before

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Special weather statement, Apr 13, 6:57 PM CDT, 37 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
Apr 13, 7:23 PM CDT	Severe Thunderstorm Warning	JAN	Lamar, Marion	26 min
Apr 13, 7:41 PM CDT	Severe Thunderstorm Warning	JAN	Noxubee	34 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2009 Every severe thunderstorm warning 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.