Alert archive / Arkansas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 149, NWS Little Rock, AR

May 21, 20134 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at May 21, 2013, 7:09 PM CDT for 4 counties in Arkansas. It was in force for 36 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: May 21, 2013, 7:09 PM CDT (00:09 UTC)
Expired: May 21, 2013, 7:45 PM CDT
In force: 36 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Bradley County, AR, Cleveland County, AR, Drew County, AR, Lincoln County, AR

The radar

The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 00:09 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
May 21, 1:50 PM CDT	Tornado Watch	SPC	8 hr
May 21, 3:00 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 0.2 hours before the alert went out and 221 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: 57 J/kg
Mixed-layer CIN: -554 J/kg
Mixed-layer LCL: 1175 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: 20 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 Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 2:43 PM CDT, 4 hours 26 minutes earlier.

Area forecast discussion, May 21, 2:43 PM CDT, 4 hours 26 minutes before

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Hazardous weather outlook, May 21, 4:20 PM CDT, 2 hours 49 minutes before

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In the hours before

Local storm report, May 21, 1:23 PM CDT, 5 hours 46 minutes before

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Special weather statement, May 21, 2:02 PM CDT, 5 hours 7 minutes before

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Special weather statement, May 21, 2:41 PM CDT, 4 hours 28 minutes before

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Special weather statement, May 21, 3:33 PM CDT, 3 hours 36 minutes before

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The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 8:00 PM CDT	Severe Thunderstorm Warning	LZK	Drew, Lincoln	30 min
May 21, 8:30 PM CDT	River Flood Advisory	LZK	Independence, Jackson, Lawrence	24 hr
May 22, 11:59 AM CDT	River Flood Advisory	LZK	Arkansas, Monroe	36 hr

Nearby

Severe Thunderstorm Warnings in Arkansas, 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.