Alert archive / Arkansas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 28, NWS Memphis, TN

February 18, 2013Shelby County, Tennessee; DeSoto County, Mississippi; Crittenden County, St. Francis County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Feb 18, 2013, 7:31 PM CST for Shelby County, Tennessee; DeSoto County, Mississippi; Crittenden County, St. Francis County, Arkansas. 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: Feb 18, 2013, 7:31 PM CST (01:31 UTC)
Expired: Feb 18, 2013, 8:00 PM CST
In force: 29 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Crittenden County, AR, St. Francis County, AR, DeSoto County, MS, Shelby County, TN

The radar

The Memphis radar (KNQA), 45 km from the middle of the area, began a volume at 01:34 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 nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 1.5 hours before the alert went out and 37 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: 139 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 18, 6:57 PM CST, 34 minutes earlier.

Area forecast discussion, Feb 18, 6:57 PM CST, 34 minutes before

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Hazardous weather outlook, Feb 18, 7:04 PM CST, 27 minutes before

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In the hours before

Local storm report, Feb 18, 6:54 PM CST, 37 minutes before

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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 18, 7:29 PM CST	Severe Thunderstorm Warning	MEG	Lauderdale, Tipton	31 min
Feb 18, 6:48 PM CST	Severe Thunderstorm Warning	MEG	Cross, Lee, St. Francis	27 min
Feb 19, 2:32 PM CST	Winter Storm Watch	MEG	Clay, Craighead, Greene, Lawrence, Randolph	24 hr

Nearby

Severe Thunderstorm Warnings in Arkansas, 2013 Severe Thunderstorm Warnings in Tennessee, 2013 Severe Thunderstorm Warnings in Mississippi, 2013 Every severe thunderstorm warning in 2013

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.