Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 727, NWS Little Rock, AR

July 31, 2011Pulaski County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 31, 2011, 3:04 PM CDT for Pulaski County, Arkansas. It was in force for 31 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 31, 2011, 3:04 PM CDT (20:04 UTC)
Expired
Jul 31, 2011, 3:35 PM CDT
In force
31 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon

County Pulaski County, AR

The radar

The Little Rock radar (KLZK), 9 km from the middle of the area, began a volume at 20:05 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

Springfield, MO (KSGF), launched 12:00Z, 8.1 hours before the alert went out and 272 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, Springfield, MO at 12:00Z on 2011-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 861 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, Springfield, MO at 12:00Z on 2011-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
861 J/kg
Mixed-layer CIN
-120 J/kg
Mixed-layer LCL
1336 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.8

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 31, 3:04 PM CDT, 0 minutes earlier.

Area forecast discussion, Jul 31, 3:04 PM CDT, 0 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
304 PM CDT SUN JUL 31 2011

.SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT

ISOLATED TO SCATTERED SHRA/TSRA HAVE DEVELOPED THIS AFTERNOON IN THE
HEAT OF THE AFTERNOON AS A WEAK UPPER DISTURBANCE MOVES OVERHEAD.
OPPRESSIVE HEAT WAS ALSO THE STORY ACROSS MUCH OF THE CWA...WITH
SOME LOCATIONS SEEING TEMPS OVER 100 BY NOON. THIS AFTERNOON...MUCH
OF THE STATE WAS SEEING UPPER 90S TO LOW 100S...AND DEWPTS IN THE
UPPER 60S TO LOW 70S. THE EXCEPTION HOWEVER IS SOME OF THE NRN
COUNTIES WHERE PERSISTENT CLOUD COVER FROM EARLY MORNING PRECIP HAS
KEPT TEMPS IN THE 80S TO LOW 90S. THE ONGOING SHRA/TSRA WILL LIKELY
PERSIST INTO THE EARLY EVENING HRS...WITH SOME STRONG...MAYBE SVR
STORMS POSSIBLE. THE MAIN THREAT WILL BE DAMAGING WINDS WITH THE
STRONGEST STORMS.

THE MAIN FOCUS FOR THE REST OF THE SHORT TERM WILL BE THE
PERSISTENT...AND OPPRESSIVE HEAT THROUGH MUCH OF THE WEEK AS THE
UPPER RIDGE BECOMES PARKED OVERHEAD. UPPER 90S...TO LOW 100S WILL BE
LIKELY EACH DAY...WITH WED POSSIBLY THE HOTTEST AS WINDS WILL BE
MORE SOUTH TO SWRLY. DRIER AIR FROM THE SW...COMBINED WITH INCREASED
MIXING OF DRY AIR ALOFT WILL RESULT IN TEMPS EASILY WARMING TO 100
OR MORE AT MOST LOCATIONS WED AFTERNOON. THE HIGHER ELEVATIONS OF
THE OZARKS MAY REMAIN IN THE 90S HOWEVER. SOME LOCATIONS COULD SEE
TEMPS AROUND 105..ESPECIALLY ACROSS THE FAR SW AND ALONG THE AR
RIVER VALLEY REGION WEST OF LITTLE ROCK. OVERNIGHT LOWS WILL ALSO
REMAIN HIGH...WITH MAINLY MID 70S TO LOW 80S SEEN. HEAT INDICES WILL
REMAIN DANGEROUSLY HIGH...WITH 105-115 LIKELY. SO HAVE DECIDED TO
EXTEND HEAT ADV THROUGH AT LEAST WED EVENING...THOUGH AN EXTENSION
LATER IN THE WEEK LOOKS FAIRLY LIKELY AT THIS TIME. EXPECT POPS TO
REMAIN LOW WITH THIS RIDGE...WITH ONLY AN ISOLATED STORM POSSIBLE
DURING THE HEAT OF THE AFTERNOON HRS EACH DAY.

&&

.LONG TERM...THURSDAY THROUGH SUNDAY

HIGH PRESSURE WILL BE DOMINANT THROUGH MUCH OF THE PERIOD. THE HIGH
WILL BE CENTERED OVER THE SOUTHERN PLAINS...WITH VERY HOT AND MOSTLY
DRY CONDITIONS EXPECTED. AFTERNOON TEMPERATURES WILL BE IN A 100 TO
105 DEGREE RANGE IN MUCH OF CENTRAL/WESTERN ARKANSAS. MAXIMUM HEAT
INDEX VALUES WILL EXCEED 105 DEGREES IN MOST AREAS...WITH HEAT
ADVISORIES NECESSARY.

THE HIGH WILL BE LEAST DOMINANT IN EASTERN ARKANSAS. THERE MAY BE
ENOUGH LOW LEVEL MOISTURE IN THE EAST FOR ISOLATED AFTERNOON/EVENING
THUNDERSTORMS. KEPT SMALL CHANCES FOR RAIN TO THE FORECAST.

TOWARD THE END OF THE PERIOD...IT APPEARS THE HIGH WILL SLOWLY DRIFT
TOWARD THE ROCKIES. IF THIS HAPPENS...IT WILL NOT BE QUITE SO HOT
WITH BETTER CHANCES FOR THUNDERSTORMS. NOT CONFIDENT THIS WILL PAN
OUT...BUT WILL MONITOR.

&&

.PRELIMINARY POINT TEMPS/POPS...
BATESVILLE AR     75  99  74 100 /  20  10  10   0
CAMDEN AR         75 102  78 103 /  20  20  10  10
HARRISON AR       74  99  74 100 /  20  10  10   0
HOT SPRINGS AR    77 101  78 103 /  20  10  10   0
LITTLE ROCK   AR  77 102  77 103 /  20  10  10   0
MONTICELLO AR     75  99  76 101 /  20  20  10  10
MOUNT IDA AR      75 102  77 102 /  20  10  10   0
MOUNTAIN HOME AR  74  99  74 101 /  20  10  10   0
NEWPORT AR        75  99  73 100 /  20  10  10   0
PINE BLUFF AR     76  99  77 102 /  20  20  10   0
RUSSELLVILLE AR   77 103  77 104 /  20  10  10   0
SEARCY AR         76  99  76 100 /  20  10  10   0
STUTTGART AR      76  98  77 100 /  20  10  10   0
&&

.LZK WATCHES/WARNINGS/ADVISORIES...
HEAT ADVISORY UNTIL 9 PM CDT WEDNESDAY FOR ARKANSAS-BRADLEY-
CALHOUN-CLARK-CLEBURNE-CLEVELAND-CONWAY-DALLAS-DESHA-DREW-
FAULKNER-GARLAND-GRANT-HOT SPRING-INDEPENDENCE-JACKSON-JEFFERSON-
JOHNSON-LINCOLN-LOGAN-LONOKE-MONROE-MONTGOMERY-OUACHITA-PERRY-
PIKE-POLK-POPE-PRAIRIE-PULASKI-SALINE-SCOTT-VAN BUREN-WHITE-
WOODRUFF-YELL.

HEAT ADVISORY FROM 9 AM MONDAY TO 9 PM CDT WEDNESDAY FOR BAXTER-
BOONE-FULTON-IZARD-MARION-NEWTON-SEARCY-SHARP-STONE.

&&

SHORT TERM...62 / LONG TERM...46
Hazardous weather outlook, Jul 31, 5:00 AM CDT, 10 hours 4 minutes before
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In the hours before

Special weather statement, Jul 31, 12:43 PM CDT, 2 hours 21 minutes before
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Special weather statement, Jul 31, 1:35 PM CDT, 1 hour 29 minutes before
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Special weather statement, Jul 31, 1:36 PM CDT, 1 hour 28 minutes before
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Special weather statement, Jul 31, 2:02 PM CDT, 1 hour 2 minutes before
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Special weather statement, Jul 31, 2:39 PM CDT, 25 minutes before
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Special weather statement, Jul 31, 2:53 PM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:09 PM CDTSpecial Weather StatementLZKStone31 min
Jul 30, 7:35 PM CDTSevere Thunderstorm WarningLZKCleburne, Stone, Van Buren40 min
Jul 30, 8:12 PM CDTSpecial Weather StatementLZKSharp43 min
Jul 31, 11:11 AM CDTHeat AdvisoryLZKBaxter, Fulton, Izard, Marion, Sharp, Stone49 hr
Jul 31, 12:36 PM CDTSpecial Weather StatementLZKSaline29 min
Jul 31, 12:43 PM CDTSpecial Weather StatementLZKPolk32 min
Jul 31, 1:35 PM CDTSpecial Weather StatementLZKFaulkner30 min
Jul 31, 1:36 PM CDTSpecial Weather StatementLZKConway29 min
Jul 31, 2:02 PM CDTSpecial Weather StatementLZKPope28 min
Jul 31, 2:39 PM CDTSpecial Weather StatementLZKPulaski31 min
Jul 31, 2:43 PM CDTSevere Thunderstorm WarningLZKJohnson, Newton32 min
Jul 31, 2:53 PM CDTSpecial Weather StatementLZKPope47 min
Jul 31, 2:54 PM CDTSevere Thunderstorm WarningLZKGrant, Pulaski, Saline36 min
Jul 31, 3:14 PM CDTSpecial Weather StatementLZKYell31 min
Jul 31, 3:28 PM CDTSpecial Weather StatementLZKNewton47 min
Jul 31, 3:33 PM CDTSevere Thunderstorm WarningLZKLonoke, Pulaski, Saline27 min
Jul 31, 3:36 PM CDTSpecial Weather StatementLZKPike44 min
Jul 31, 3:39 PM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant, Jefferson51 min
Jul 31, 4:00 PM CDTSpecial Weather StatementLZKYell30 min
Jul 31, 4:05 PM CDTSevere Thunderstorm WarningLZKLogan, Yell25 min
Jul 31, 4:30 PM CDTSpecial Weather StatementLZKGrant30 min
Jul 31, 4:58 PM CDTSpecial Weather StatementLZKGarland32 min
Jul 31, 5:18 PM CDTSpecial Weather StatementLZKGarland32 min
Jul 31, 6:01 PM CDTFlash Flood WarningLZKGarland, Perry3 hr

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.