Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 420, NWS Little Rock, AR

September 1, 2012Cleveland County, Grant County, Jefferson County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Sep 1, 2012, 10:45 PM CDT for Cleveland County, Grant County, Jefferson County, Arkansas. It was in force for 30 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
Sep 1, 2012, 10:45 PM CDT (03:45 UTC)
Expired
Sep 1, 2012, 11:15 PM CDT
In force
30 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 03:46 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.

IssuedProductOfficeLasted
Sep 1, 6:11 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 3.8 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 00:00Z on 2012-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2103 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 00:00Z on 2012-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.193958Sfc1 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
2103 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
1167 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.7
Supercell composite
7.0

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 Sep 1, 10:02 PM CDT, 43 minutes earlier.

Area forecast discussion, Sep 1, 10:02 PM CDT, 43 minutes before
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Hazardous weather outlook, Sep 1, 6:45 PM CDT, 4 hours before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LITTLE ROCK AR
645 PM CDT SAT SEP 1 2012

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-021000-
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-
645 PM CDT SAT SEP 1 2012

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

.DAY ONE...THIS EVENING AND TONIGHT

THE REMNANTS OF HURRICANE ISAAC ARE NOW OVER CENTRAL MISSOURI.
HOWEVER...TROPICAL MOISTURE REMAINS ACROSS THE NATURAL STATE AND AS
ISAAC CONTINUES TO MOVE ACROSS MISSOURI...ANOTHER ROUND OF SHOWERS
AND THUNDERSTORMS HAS DEVELOPED OVER ARKANSAS. A TORNADO WATCH IS IN
EFFECT FOR PARTS OF NORTHEAST ARKANSAS THROUGH LATE EVENING. A
SEVERE THUNDERSTORM WATCH IS NOW IN EFFECT FOR ROUGHLY THE SOUTHEAST
HALF OF THE STATE.

STRONG TO SEVERE THUNDERSTORMS WILL REMAIN POSSIBLE THIS EVENING
WITH THE BEST CHANCES ACROSS THE SOUTHEAST HALF OF THE STATE. THE
MAIN THREAT AT THIS TIME IS STRONG DAMAGING WINDS. TORNADOES WILL BE
POSSIBLE. OVER THE NORTHEAST CORNER OF THE STATE AS STRONG WIND
ENERGY REMAINS ACROSS THE REGION DUE TO THE REMNANTS OF HURRICANE
ISAAC.

WITH THE SOUPY AIR MASS SITTING OVER THE STATE...ANY STORM WILL BE
CAPABLE OF PRODUCING BRIEF HEAVY RAIN. ANY ADDITIONAL HEAVY RAINFALL
FROM THUNDERSTORMS WOULD LEAD TO LOCALIZED FLASH FLOODING ESPECIALLY
IN AREAS THAT SAW THE VERY HEAVY RAINFALL THE PAST 2 DAYS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE THREAT FOR WIDESPREAD SEVERE WEATHER IS EXPECTED TO REMAIN LOW
NEXT WEEK. HOWEVER...MOISTURE LEVELS HAVE INCREASED OVER THE PAST
FEW DAYS AS A RESULT OF WIDESPREAD RAINFALL. AFTERNOON TEMPERATURES
ARE EXPECTED TO WARM BACK INTO THE MID AND EVEN SOME UPPER 90S
ACROSS THE AREA THROUGH THE MIDDLE OF NEXT WEEK. AS A RESULT...HEAT
INDICES COULD RISE TO NEAR OR JUST ABOVE 100 DEGREES SUNDAY...MONDAY
AND TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND
EVENING...ESPECIALLY AREAS NORTHEAST OF LITTLE ROCK.

&&

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

56

In the hours before

Local storm report, Sep 1, 8:23 PM CDT, 2 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
823 PM CDT SAT SEP 01 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0702 PM     TSTM WND DMG     DIXIE                   35.08N 91.35W
08/31/2012                   WOODRUFF           AR   LAW ENFORCEMENT

            TREES AND POWERLINES DOWN IN DIXIE.

&&

56
Special weather statement, Sep 1, 9:05 PM CDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
905 PM CDT SAT SEP 1 2012

ARZ047-057-020250-
ARKANSAS AR-MONROE AR-
905 PM CDT SAT SEP 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR EXTREME SOUTHEASTERN MONROE AND
CENTRAL ARKANSAS COUNTIES UNTIL 945 PM CDT...

AT 903 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR DE WITT...OR 18 MILES NORTHWEST OF WHITE
RIVER NWR...MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  ST. CHARLES...        DE WITT...            ETHEL...
  DE LUCE...            WRIGHT LAKE...        VAN...
  TURNER LAKE...        THOMAS RESERVOIR...   STAR LAKE...
  SHEPPARD POINT...     PRICES LAKE...        PRAIRIE UNION...
  OLENA...              MITCHELL LAKE...      MILLER LAKE...
  MCKINLEY RES...       MCKEWEN LAKE...       MAYVIEW...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 3433 9105 3429 9106 3428 9107 3421 9106
      3419 9109 3416 9108 3420 9144 3438 9142
      3438 9100 3434 9100
TIME...MOT...LOC 0206Z 274DEG 23KT 3428 9132

56
Special weather statement, Sep 1, 9:20 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
920 PM CDT SAT SEP 1 2012

ARZ057-065-020250-
ARKANSAS AR-DESHA AR-
920 PM CDT SAT SEP 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN DESHA AND SOUTHEASTERN
ARKANSAS COUNTIES UNTIL 945 PM CDT...

AT 916 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 4 MILES SOUTHEAST OF GILLETT...OR 11 MILES WEST
OF WHITE RIVER NWR...MOVING EAST AT 30 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  WHITE RIVER NWR...    TRUSTEN HOLDER WMA... STIMSON...
  SNOW LAKE...          MORGAN PT REC AREA... MERRISACH LAKE...
  LORAYS...             LACONIA...            GILLETT...
  WEBER...              PENDLETON...          MOZART...
  ARKANSAS POST...      WOLF BAYOU...         WHITING LAKE...
  WEBFOOT LAKE...       WARD RESERVOIR...     TICHNOR...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 3402 9090 3401 9098 3398 9096 3395 9097
      3399 9102 3397 9108 3396 9108 3394 9102
      3393 9102 3397 9143 3419 9140 3418 9109
      3412 9110 3412 9096 3410 9092 3410 9089
      3408 9086
TIME...MOT...LOC 0220Z 272DEG 24KT 3408 9130

56
Local storm report, Sep 1, 9:24 PM CDT, 1 hour 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
924 PM CDT SAT SEP 01 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     TSTM WND DMG     DES ARC                 34.98N 91.51W
09/01/2012                   PRAIRIE            AR   CO-OP OBSERVER

            COOP OBSERVER REPORTED LOTS OF LARGE TREES WERE DOWN
            ALONG WITH SEVERAL DOWN POWER LINES. OBSERVER ALSO
            REPORTED ALMOST 2.5 INCHES OF RAIN IN TWO HOURS.

&&

MCLAY
Local storm report, Sep 1, 9:40 PM CDT, 1 hour 5 minutes before
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Local storm report, Sep 1, 9:46 PM CDT, 59 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 7:09 PM CDTSevere Thunderstorm WarningLZKArkansas, Jefferson, Lonoke, Prairie51 min
Sep 1, 7:09 PM CDTSevere Thunderstorm WarningLZKMonroe, Prairie, Woodruff51 min
Sep 1, 7:13 PM CDTSevere Thunderstorm WarningLZKGrant, Hot Spring, Jefferson47 min
Sep 1, 7:21 PM CDTTornado WarningLZKMonroe, Prairie, Woodruff24 min
Sep 1, 7:38 PM CDTSevere Thunderstorm WarningLZKMonroe22 min
Sep 1, 7:47 PM CDTSevere Thunderstorm WarningLZKArkansas, Monroe13 min
Sep 1, 7:53 PM CDTSevere Thunderstorm WarningLZKGarland, Grant, Hot Spring, Saline52 min
Sep 1, 8:07 PM CDTSpecial Weather StatementLZKArkansas13 min
Sep 1, 8:11 PM CDTSpecial Weather StatementLZKJefferson44 min
Sep 1, 8:46 PM CDTSevere Thunderstorm WarningLZKGrant, Jefferson44 min
Sep 1, 9:05 PM CDTSpecial Weather StatementLZKArkansas45 min
Sep 1, 9:20 PM CDTSpecial Weather StatementLZKDesha30 min
Sep 1, 9:29 PM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant46 min
Sep 1, 9:34 PM CDTFlash Flood WarningLZKGarland, Grant, Hot Spring, Saline3 hr
Sep 1, 9:36 PM CDTSevere Thunderstorm WarningLZKDallas, Grant24 min
Sep 1, 10:01 PM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant, Jefferson44 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012Every 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.