Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 116, NWS Little Rock, AR

May 7, 2012Jefferson County, Lonoke County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at May 7, 2012, 10:13 PM CDT for Jefferson County, Lonoke County, Arkansas. It was in force for 16 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 7, 2012, 10:13 PM CDT (03:13 UTC)
Expired: May 7, 2012, 10:29 PM CDT
In force: 16 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Jefferson County, AR, Lonoke County, AR

The radar

The Little Rock radar (KLZK), 48 km from the middle of the area, began a volume at 03:14 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

Shreveport, LA (KSHV), launched 00:00Z, 3.2 hours before the alert went out and 283 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: 891 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1717 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 72 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 7, 7:04 PM CDT, 3 hours 9 minutes earlier.

Area forecast discussion, May 7, 7:04 PM CDT, 3 hours 9 minutes before

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Hazardous weather outlook, May 7, 11:22 AM CDT, 10 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1122 AM CDT MON MAY 7 2012

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-081000-
ARKANSAS-BAXTER-BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND-
CONWAY-DALLAS-DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING-
INDEPENDENCE-IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-LONOKE-
MARION-MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-POPE-
PRAIRIE-PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-WHITE-
WOODRUFF-YELL-
1122 AM CDT MON MAY 7 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A LARGE PART OF ARKANSAS.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING...ACROSS AREAS ALONG AND SOUTH OF A LINE FROM MENA...TO DUMAS.

INSTABILITY IS EXPECTED TO BE MAXIMIZED THIS AFTERNOON IN THE SLIGHT
RISK AREA. ANY THUNDERSTORMS THAT REACH SEVERE LIMITS WILL BE
CAPABLE OF LARGE HAIL...BRIEF...BUT INTENSE WIND GUSTS...AND VERY
HEAVY RAINFALL.

THE OVERALL SEVERE THREAT WILL GRADUALLY DIMINISH AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THUNDERSTORMS WILL BE POSSIBLE ACROSS EXTREME SOUTHERN ARKANSAS ON
TUESDAY.

THESE THUNDERSTORMS ARE NOT EXPECTED TO REACH SEVERE LIMITS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED...ACROSS THE SLIGHT RISK
AREA...MAINLY BETWEEN 3 PM AND 9 PM MONDAY.

&&

VISIT NWS LITTLE ROCK ON THE WEB. GO TO HTTP://WEATHER.GOV AND
CLICK ON CENTRAL ARKANSAS.

55

In the hours before

Special weather statement, May 7, 6:47 PM CDT, 3 hours 26 minutes before

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Local storm report, May 7, 6:53 PM CDT, 3 hours 20 minutes before

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Local storm report, May 7, 9:10 PM CDT, 1 hour 3 minutes before

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Special weather statement, May 7, 9:15 PM CDT, 58 minutes before

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Special weather statement, May 7, 9:30 PM CDT, 43 minutes before

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Special weather statement, May 7, 10:05 PM CDT, 8 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 7, 7:16 PM CDT	Severe Thunderstorm Warning	LZK	Ouachita	25 min
May 7, 8:38 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Dallas	42 min
May 7, 9:15 PM CDT	Special Weather Statement	LZK	Lincoln	45 min
May 7, 9:30 PM CDT	Special Weather Statement	LZK	Cleveland	45 min
May 7, 10:05 PM CDT	Special Weather Statement	LZK	Jefferson	45 min
May 7, 11:14 PM CDT	Special Weather Statement	LZK	Arkansas, Jefferson, Lincoln	41 min
May 7, 11:55 PM CDT	Special Weather Statement	LZK	Drew, Lincoln	45 min
May 8, 6:26 AM CDT	River Flood Warning	LZK	Jackson, Woodruff	8 days

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012 Every severe thunderstorm warning in 2012

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.