Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 647, NWS Little Rock, AR

July 4, 2011Cleveland County, Grant County, Jefferson County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 4, 2011, 3:12 PM CDT for Cleveland County, Grant County, Jefferson County, Arkansas. It was in force for 48 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
Jul 4, 2011, 3:12 PM CDT (20:12 UTC)
Expired
Jul 4, 2011, 4:00 PM CDT
In force
48 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon

Counties Cleveland County, AR, Grant County, AR, Jefferson County, AR

The radar

The Little Rock radar (KLZK), 76 km from the middle of the area, began a volume at 20:15 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 12:00Z, 8.2 hours before the alert went out and 218 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2011-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1502 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2011-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1502 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
1238 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
119 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 Jul 4, 3:02 PM CDT, 10 minutes earlier.

Area forecast discussion, Jul 4, 3:02 PM CDT, 10 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
302 PM CDT MON JUL 4 2011

.SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT
LATEST OBSERVATIONS INDICATE THAT THE STRONGEST CONCENTRATION OF
CONVECTION EXTENDS FROM NEAR MENA...TO NEAR LAKE OUACHITA...IN AN
AREA OF STRONGEST...YET MODEST LOW LEVEL FORCING. SLOW MOVING
CELLS...CELL MERGERS...AND A MOIST ATMOSPHERIC COLUMN HAS PROMOTED
EFFICIENT RAINFALL PRODUCING STORMS. THIS ACTIVITY IS EXPECTED TO
SLOWLY DECREASE THROUGH 00Z...THEN MORE QUICKLY DIMINISH SHORTLY
AFTER SUNSET.

EXPECT SIMILAR CONVECTIVE DEVELOPMENT FOR THE NEXT SEVERAL DAYS.
WEAK NORTHWESTERLY FLOW...MOIST CONDITIONS...AND MODERATE SURFACE
BASED INSTABILITY PROMOTE SCATTERED...DIURNALLY ENHANCED...
MULTICELLUAR CONVECTION.

&&

.LONG TERM...FRIDAY THROUGH MONDAY
VERY FEW CHGS WERE MADE TO THE GOING FCST FOR DURG THE LONG TERM.
MODELS RMN IN FAIRLY GOOD AGREEMENT WITH OVERALL TRENDS HEADING INTO
NEXT WEEKEND. THE UPR RDG...CURRENTLY CENTERED OVR THE CNTRL
ROCKIES...WL SHIFT EWD ONCE AGAIN AND BLD INTO THE REGION DURG THE
PD. BASICALLY LOOKING AT A CONTD SUMMERTIME PATTERN LIKE WE HAVE
SEEN RECENTLY...WITH HIGHS IN THE 90S AND LOWS MAINLY IN THE 70S.
CONTD TO MENTION LOW CHC POPS MOST DAYS...WITH MAINLY A DIURNAL
TREND EXPECTED.
&&

.PRELIMINARY POINT TEMPS/POPS...
BATESVILLE AR     72  95  69  94 /  40  20  20  10
CAMDEN AR         72  97  69  97 /  40  30  30  20
HARRISON AR       69  93  66  93 /  30  20  20  10
HOT SPRINGS AR    72  97  69  96 /  40  20  20  20
LITTLE ROCK   AR  72  96  71  96 /  40  20  30  20
MONTICELLO AR     72  97  71  96 /  40  30  30  30
MOUNT IDA AR      71  97  69  96 /  40  20  20  10
MOUNTAIN HOME AR  71  94  66  93 /  40  20  20  10
NEWPORT AR        73  95  71  94 /  40  20  20  10
PINE BLUFF AR     73  97  72  96 /  40  30  30  20
RUSSELLVILLE AR   71  95  69  95 /  40  20  20  10
SEARCY AR         72  96  71  95 /  40  20  20  20
STUTTGART AR      73  96  73  95 /  40  30  30  20
&&

.LZK WATCHES/WARNINGS/ADVISORIES...NONE.
&&

SHORT TERM...55 / LONG TERM...44
Hazardous weather outlook, Jul 4, 1:01 PM CDT, 2 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
101 PM CDT MON JUL 4 2011

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-051000-
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-
101 PM CDT MON JUL 4 2011

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON
AND EVENING. WHILE WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...A FEW
STORMS ARE EXPECTED TO APPROACH SEVERE LIMITS. BRIEF...DAMAGING WIND
GUSTS CAN BE EXPECTED WITH THE STRONGEST STORMS.

THE SLOW MOVEMENT OF THESE STORMS...ACTING ON ABUNDANT
MOISTURE...WILL ALLOW FOR AREAS OF LOCALIZED...HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ISOLATED AND SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE
OVER THE NEXT SEVERAL DAYS...MAINLY DURING THE AFTERNOON AND EARLY
EVENING HOURS EACH DAY. WHILE WIDESPREAD AND ORGANIZED SEVERE
WEATHER IS NOT EXPECTED AT THIS TIME...ANY STORM THAT DOES FORM COULD
BECOME STRONG TO SEVERE. THE MAIN THREAT WITH ANY SEVERE STORM
WILL BE HIGH WINDS.

WITH TEMPERATURES REMAINING IN THE 90S TO AROUND 100...AND WITH
HUMIDITY LEVELS REMAIN ELEVATED...HEAT INDEX VALUES WILL ALSO REMAIN
HIGH. EXPECT AFTERNOON HEAT INDICES TO RANGE FROM THE UPPER 90S TO
AROUND 105 DURING THE PEAK HEAT OF THE AFTERNOON EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

&&

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, Jul 4, 2:24 PM CDT, 48 minutes before
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Special weather statement, Jul 4, 2:32 PM CDT, 40 minutes before
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Special weather statement, Jul 4, 2:41 PM CDT, 31 minutes before
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Special weather statement, Jul 4, 2:53 PM CDT, 19 minutes before
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Special weather statement, Jul 4, 2:57 PM CDT, 15 minutes before
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Special weather statement, Jul 4, 3:10 PM CDT, 2 minutes before
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 9:45 PM CDTSpecial Weather StatementLZKBaxter, Boone, Marion45 min
Jul 4, 12:45 PM CDTSpecial Weather StatementLZKPike60 min
Jul 4, 1:22 PM CDTSevere Thunderstorm WarningLZKMontgomery, Pike38 min
Jul 4, 1:35 PM CDTSpecial Weather StatementLZKClark45 min
Jul 4, 1:44 PM CDTSpecial Weather StatementLZKPolk46 min
Jul 4, 1:52 PM CDTSevere Thunderstorm WarningLZKClark, Hot Spring38 min
Jul 4, 1:59 PM CDTSpecial Weather StatementLZKMontgomery46 min
Jul 4, 2:01 PM CDTSpecial Weather StatementLZKFaulkner44 min
Jul 4, 2:07 PM CDTSevere Thunderstorm WarningLZKClark, Hot Spring, Montgomery, Pike23 min
Jul 4, 2:08 PM CDTFlash Flood WarningLZKClark, Hot Spring, Montgomery, Pike, Polk112 min
Jul 4, 2:09 PM CDTSevere Thunderstorm WarningLZKConway, Faulkner, Perry51 min
Jul 4, 2:11 PM CDTSevere Thunderstorm WarningLZKPolk, Scott49 min
Jul 4, 2:24 PM CDTSpecial Weather StatementLZKDallas46 min
Jul 4, 2:30 PM CDTSevere Thunderstorm WarningLZKClark45 min
Jul 4, 2:32 PM CDTSpecial Weather StatementLZKJefferson43 min
Jul 4, 2:41 PM CDTSpecial Weather StatementLZKMontgomery44 min
Jul 4, 2:46 PM CDTFlash Flood WarningLZKClark, Garland, Hot Spring, Montgomery, Pike, Polk and 1 more2 hr
Jul 4, 2:46 PM CDTSevere Thunderstorm WarningLZKCleveland, Jefferson, Lincoln44 min
Jul 4, 2:53 PM CDTSpecial Weather StatementLZKFaulkner47 min
Jul 4, 2:57 PM CDTSpecial Weather StatementLZKDallas48 min
Jul 4, 3:05 PM CDTSevere Thunderstorm WarningLZKGarland, Saline25 min
Jul 4, 3:10 PM CDTSpecial Weather StatementLZKCleveland45 min
Jul 4, 3:17 PM CDTSpecial Weather StatementLZKHot Spring43 min
Jul 4, 3:19 PM CDTSpecial Weather StatementLZKHot Spring46 min
Jul 4, 3:23 PM CDTSpecial Weather StatementLZKCalhoun47 min
Jul 4, 3:26 PM CDTSevere Thunderstorm WarningLZKGarland, Hot Spring49 min
Jul 4, 3:28 PM CDTSpecial Weather StatementLZKGarland47 min
Jul 4, 3:46 PM CDTSevere Thunderstorm WarningLZKGarland, Saline29 min
Jul 4, 3:48 PM CDTSevere Thunderstorm WarningLZKGrant, Jefferson42 min
Jul 4, 3:51 PM CDTSevere Thunderstorm WarningLZKHot Spring39 min
Jul 4, 3:53 PM CDTSpecial Weather StatementLZKCleveland47 min
Jul 4, 3:58 PM CDTSevere Thunderstorm WarningLZKDesha47 min
Jul 4, 3:58 PM CDTSevere Thunderstorm WarningLZKDrew, Lincoln32 min
Jul 4, 4:16 PM CDTSevere Thunderstorm WarningLZKDesha, Drew, Lincoln29 min
Jul 4, 4:27 PM CDTSevere Thunderstorm WarningLZKDallas, Grant, Jefferson33 min
Jul 4, 4:29 PM CDTSpecial Weather StatementLZKDallas46 min
Jul 4, 4:43 PM CDTSevere Thunderstorm WarningLZKArkansas, Desha, Drew, Lincoln28 min
Jul 4, 4:56 PM CDTSevere Thunderstorm WarningLZKGrant, Jefferson17 min
Jul 4, 4:58 PM CDTFlash Flood WarningLZKArkansas, Cleveland, Desha, Drew, Lincoln2 hr
Jul 4, 5:17 PM CDTSpecial Weather StatementLZKLincoln48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2011Every severe thunderstorm warning in 2011

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.