Alert archive / Mississippi / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 17, NWS Jackson, MS

February 17, 2009Leflore County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Feb 17, 2009, 11:17 PM CST for Leflore County, Mississippi. It was in force for 26 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: Feb 17, 2009, 11:17 PM CST (05:17 UTC)
Expired: Feb 17, 2009, 11:43 PM CST
In force: 26 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

County Leflore County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 144 km from the middle of the area, began a volume at 05:16 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
Feb 17, 7:09 PM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 5.3 hours before the alert went out and 146 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: 6 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 416 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 686 m²/s²
0-3 km storm-relative helicity: 715 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Feb 17, 7:32 PM CST, 3 hours 45 minutes earlier.

Area forecast discussion, Feb 17, 7:32 PM CST, 3 hours 45 minutes before

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Hazardous weather outlook, Feb 17, 4:22 PM CST, 6 hours 55 minutes before

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In the hours before

Special weather statement, Feb 17, 9:49 PM CST, 1 hour 28 minutes before

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Special weather statement, Feb 17, 10:55 PM CST, 22 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
Feb 18, 3:22 PM CST	Severe Thunderstorm Warning	JAN	Kemper, Lauderdale	14 min
Feb 18, 4:29 PM CST	Severe Thunderstorm Warning	JAN	Rankin, Scott	46 min
Feb 18, 5:06 PM CST	Severe Thunderstorm Warning	JAN	Lauderdale, Newton, Scott	54 min
Feb 18, 5:58 PM CST	Severe Thunderstorm Warning	JAN	Clarke, Lauderdale	47 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.