Alert archive / Arkansas / Special Weather Statements in 2011

Special Weather Statement, NWS Little Rock, AR

August 7, 2011Jefferson County, Arkansas

NWS Little Rock, AR issued this special weather statement at Aug 7, 2011, 3:44 PM CDT for Jefferson County, Arkansas. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 7, 2011, 3:44 PM CDT (20:44 UTC)
Expired
Aug 7, 2011, 4:30 PM CDT
In force
46 min
Issued by
NWS Little Rock, AR

County Jefferson County, AR

The radar

The Little Rock radar (KLZK), 68 km from the middle of the area, began a volume at 20:46 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 nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 8.7 hours before the alert went out and 199 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 2011-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2280 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 2011-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
2280 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1283 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 7, 1:02 PM CDT, 2 hours 42 minutes earlier.

Area forecast discussion, Aug 7, 1:02 PM CDT, 2 hours 42 minutes before
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Hazardous weather outlook, Aug 7, 4:15 AM CDT, 11 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
415 AM CDT SUN AUG 7 2011

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-
415 AM CDT SUN AUG 7 2011

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

.DAY ONE...TODAY AND TONIGHT

DANGEROUS HEAT WILL AGAIN PERSIST FOR TODAY AS HIGH TEMPERATURES
WARM TO THE UPPER 90S TO AROUND 107 ACROSS THE AREA. HUMIDITY
LEVELS WILL ALSO REMAIN HIGH...WITH HEAT INDICES EXPECTED TO TO
RANGE FROM 105 TO 114 DEGREES FOR MANY LOCATIONS.

A HEAT ADVISORY REMAINS IN EFFECT FOR TODAY. PEOPLE NEED TO TAKE THE
HEAT SERIOUSLY. HEAT IS THE NUMBER ONE WEATHER RELATED KILLER IN THE
UNITED STATES.

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON. ANY
STORM THAT DOES FORM COULD BECOME STRONG TO SEVERE...WITH DAMAGING
WINDS THE MAIN THREAT. THE BEST CHANCES FOR STORMS WILL BE ACROSS
THE NORTHEAST HALF OF THE STATE...THOUGH ISOLATED STORMS COULD
FORM FURTHER SOUTH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A HEAT ADVISORY WILL REMAIN IN EFFECT FOR A LARGE PORTION OF
THE AREA ON MONDAY AS TEMPERATURES REMAIN IN THE UPPER 90S TO
AROUND 106...AND AFTERNOON HEAT INDICES RANGE FROM 105 TO 114
DEGREES.

THE UPPER LEVEL HIGH PRESSURE RESPONSIBLE FOR THE EXCESSIVE HEAT
OVER THE PAST SEVERAL DAYS WILL SHIFT SLOWLY SOUTHWEST IN THE
COMING DAYS. AS THIS UPPER LEVEL HIGH SHIFTS SOUTHWEST... A COLD
FRONT WILL SLIDE SOUTH INTO ARKANSAS BY THE MIDDLE OF NEXT WEEK
AND STALL. THIS WILL KEEP CHANCES FOR SCATTERED SHOWERS AND
THUNDERSTORMS IN THE FORECAST FOR AT LEAST SOME PORTION OF THE
STATE THROUGH THE END OF NEXT WEEK. AS A RESULT OF INCREASED RAIN
CHANCES...THE THREAT FOR THE EXCESSIVE HEAT WILL SLOWLY DECREASE
OVER TIME.

.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.

62

In the hours before

Special weather statement, Aug 7, 2:03 PM CDT, 1 hour 41 minutes before
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Special weather statement, Aug 7, 2:16 PM CDT, 1 hour 28 minutes before
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Local storm report, Aug 7, 2:46 PM CDT, 58 minutes before
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Special weather statement, Aug 7, 2:57 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
257 PM CDT SUN AUG 7 2011

ARZ043-044-072040-
PULASKI AR-SALINE AR-
257 PM CDT SUN AUG 7 2011

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN SALINE AND CENTRAL
PULASKI COUNTIES UNTIL 345 PM CDT...

AT 254 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR COLLEGEVILLE...OR NEAR BRYANT.  THIS STORM
WAS NEARLY STATIONARY.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

* LOCATIONS IMPACTED INCLUDE...
  SW LITTLE ROCK...     BRYANT...             BENTON...
  SHANNON HILLS...      OTTER CREEK...        MABELVALE...
  HURRICANE LAKE...     GEYER SPRINGS...      WOODLAND HILLS...
  VIMY RIDGE...         SHAW...               SARDIS...
  PARKERS-IRON SPGS...  EAST END...           CONGO...
  CAMMACK VILLAGE...    BAUXITE...            BASELINE...

THIS INCLUDES INTERSTATE 30 BETWEEN MILE MARKERS 118 AND 136.

THIS INCLUDES INTERSTATE 430 BETWEEN MILE MARKERS 1 AND 7.

THIS INCLUDES INTERSTATE 530 BETWEEN MILE MARKERS 7 AND 11.

THIS INCLUDES INTERSTATE 630 BETWEEN MILE MARKERS 3 AND 7.

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

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY...TURN AROUND DONT DROWN!

LAT...LON 3478 9233 3455 9225 3449 9255 3469 9262
TIME...MOT...LOC 1957Z 255DEG 2KT 3463 9246

BJS
Local storm report, Aug 7, 3:19 PM CDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
319 PM CDT SUN AUG 07 2011

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

0148 PM     TSTM WND DMG     BRYANT                  34.61N 92.49W
08/07/2011                   SALINE             AR   LAW ENFORCEMENT

            A LARGE LIMB FELL ON A CAR ON ARKANSAS 5...DAMAGING THE
            CAR.

0240 PM     TSTM WND GST     BENTON                  34.57N 92.58W
08/07/2011  E70 MPH          SALINE             AR   TRAINED SPOTTER

            POWER LINES WERE BLOWN DOWN.

&&

28
Special weather statement, Aug 7, 3:44 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
344 PM CDT SUN AUG 7 2011

ARZ045-055>057-062>064-072130-
ARKANSAS AR-CLEVELAND AR-DALLAS AR-GRANT AR-JEFFERSON AR-LINCOLN
AR-LONOKE AR-
344 PM CDT SUN AUG 7 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LONOKE...NORTHWESTERN
LINCOLN...JEFFERSON...SOUTHERN GRANT...EASTERN DALLAS...NORTHERN
CLEVELAND AND WESTERN ARKANSAS COUNTIES UNTIL 430 PM CDT...

AT 342 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A CLUSTER OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5
MILES SOUTHWEST OF RYAN TO LOCK AND DAM NUMBER 4 TO NEAR
CARTHAGE...AND MOVING SOUTHEAST AT 15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
POSSIBLE WITH THESE STORMS...THOUGH HEAVY RAIN AND DANGEROUS...NEAR
CONTINUOUS LIGHTNING ARE THE MAIN THREATS WITH THIS CLUSTER.

* LOCATIONS IMPACTED INCLUDE...
  RISON...              PINE BLUFF...         GRAYS LAKE...
  WOODVILLE...          WHITEFIELD...         WHITE HALL...
  WARBRITTON...         RICHARDSON...         MADDING...
  LINWOOD...            LEOLA...              LAMONT...
  LAKE PINE BLUFF...    KEDRON...             HUMPHREY...
  COTTONDALE...         CARTHAGE...           ALTHEIMER...

THIS INCLUDES INTERSTATE 530 BETWEEN MILE MARKERS 31 AND 46.

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

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY...TURN AROUND DONT DROWN!

LAT...LON 3439 9159 3406 9171 3386 9253 3412 9274
      3434 9201 3464 9192
TIME...MOT...LOC 2043Z 320DEG 14KT 3448 9186 3425 9189
          3408 9256

BJS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 8:19 PM CDTSevere Thunderstorm WarningLZKBoone, Marion26 min
Aug 6, 8:46 PM CDTSevere Thunderstorm WarningLZKBoone, Marion44 min
Aug 6, 8:48 PM CDTSevere Thunderstorm WarningLZKFulton42 min
Aug 6, 9:15 PM CDTSevere Thunderstorm WarningLZKIzard, Sharp25 min
Aug 7, 1:05 PM CDTSpecial Weather StatementLZKPulaski45 min
Aug 7, 1:07 PM CDTSevere Thunderstorm WarningLZKPulaski38 min
Aug 7, 1:10 PM CDTSpecial Weather StatementLZKSaline30 min
Aug 7, 1:14 PM CDTSpecial Weather StatementLZKHot Spring46 min
Aug 7, 1:34 PM CDTSevere Thunderstorm WarningLZKPulaski41 min
Aug 7, 1:39 PM CDTSevere Thunderstorm WarningLZKPulaski, Saline36 min
Aug 7, 1:57 PM CDTSevere Thunderstorm WarningLZKLonoke, Pulaski48 min
Aug 7, 2:00 PM CDTSpecial Weather StatementLZKSaline45 min
Aug 7, 2:03 PM CDTSpecial Weather StatementLZKHot Spring47 min
Aug 7, 2:05 PM CDTSevere Thunderstorm WarningLZKGrant, Saline40 min
Aug 7, 2:16 PM CDTSpecial Weather StatementLZKLonoke44 min
Aug 7, 2:22 PM CDTSevere Thunderstorm WarningLZKLonoke53 min
Aug 7, 2:23 PM CDTSevere Thunderstorm WarningLZKCleburne, Independence, Stone37 min
Aug 7, 2:30 PM CDTSevere Thunderstorm WarningLZKJefferson, Lonoke, Pulaski45 min
Aug 7, 2:57 PM CDTSpecial Weather StatementLZKPulaski43 min
Aug 7, 3:03 PM CDTSevere Thunderstorm WarningLZKGrant, Jefferson, Saline16 min
Aug 7, 3:22 PM CDTSevere Thunderstorm WarningLZKCleburne, Independence, Stone38 min
Aug 7, 3:32 PM CDTSevere Thunderstorm WarningLZKIndependence, Jackson28 min
Aug 7, 3:59 PM CDTSevere Thunderstorm WarningLZKJackson, Woodruff46 min
Aug 7, 4:12 PM CDTSevere Thunderstorm WarningLZKDesha, Drew, Lincoln48 min
Aug 7, 4:14 PM CDTSevere Thunderstorm WarningLZKArkansas, Jefferson34 min
Aug 7, 4:24 PM CDTSevere Thunderstorm WarningLZKWhite, Woodruff31 min
Aug 7, 4:52 PM CDTSpecial Weather StatementLZKClark, Cleveland, Dallas, Lincoln43 min
Aug 7, 5:16 PM CDTSevere Thunderstorm WarningLZKWoodruff29 min
Aug 7, 5:20 PM CDTSevere Thunderstorm WarningLZKBradley, Drew26 min
Aug 7, 5:28 PM CDTSevere Thunderstorm WarningLZKDallas32 min
Aug 7, 5:40 PM CDTSevere Thunderstorm WarningLZKMontgomery, Polk50 min

Nearby

Special Weather Statements in Arkansas, 2011Every special weather statement 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.