Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 761, NWS Little Rock, AR

August 4, 2011Polk County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 4, 2011, 6:48 PM CDT for Polk County, Arkansas. It was in force for 27 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: Aug 4, 2011, 6:48 PM CDT (23:48 UTC)
Expired: Aug 4, 2011, 7:15 PM CDT
In force: 27 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

County Polk County, AR

The radar

The Western Arkansas radar (KSRX), 90 km from the middle of the area, began a volume at 23:49 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 12:00Z, 11.8 hours before the alert went out and 227 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: 1796 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1514 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 Aug 4, 6:45 PM CDT, 3 minutes earlier.

Area forecast discussion, Aug 4, 6:45 PM CDT, 3 minutes before

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Hazardous weather outlook, Aug 4, 3:50 PM CDT, 2 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE LITTLE ROCK AR
350 PM CDT THU AUG 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-
350 PM CDT THU AUG 4 2011

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

.DAY ONE...TODAY AND TONIGHT

HIGH PRESSURE WILL REMAIN DOMINANT TODAY...AND AGAIN BRING VERY HOT
CONDITIONS TO MUCH OF THE STATE. TEMPERATURES WILL MOSTLY RANGE FROM
THE MID 90S TO AROUND 105. THESE READINGS COMBINED WITH HIGH
HUMIDITY LEVELS WILL CREATE VERY DANGEROUS HEAT INDEX VALUES FROM
100 TO AROUND 115 DEGREES. ANY LOCATION THAT RECEIVES RAIN WILL HAVE
SOME RELIEF FROM THE HEAT.

AN EXCESSIVE HEAT WARNING WAS IN EFFECT THIS MORNING...BUT HAS NOW
BE LOWERED TO A HEAT ADVISORY THROUGH THE WEEKEND. PEOPLE NEED TO
TAKE THE HEAT SERIOUSLY. HEAT IS THE NUMBER ONE WEATHER RELATED
KILLER IN THE UNITED STATES.

THE THUNDERSTORMS THAT FORM TODAY COULD BECOME SEVERE...WITH
DAMAGING WIND GUSTS THE MAIN CONCERN. GUSTS COULD EXCEED 70
MPH...WHICH IS STRONG ENOUGH TO DOWN TREES AND POWER LINES. LARGE
HAIL WOULD BE A MUCH LOWER THREAT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

IT APPEARS HIGH PRESSURE WILL MOVE SLOWLY TOWARD THE SOUTHWEST
UNITED STATES IN THE COMING DAYS. THIS WILL CREATE A NORTHWEST WIND
FLOW ALOFT...WHICH WILL DRIVE A COLD FRONT INTO THE REGION BY
MONDAY. THE FRONT IS EXPECTED TO STALL TUESDAY AND WEDNESDAY.

PRECEDING THE FRONT...IT WILL REMAIN HOT INTO THE WEEKEND...WITH
ABOVE NORMAL TEMPERATURES IN THE FORECAST AND HEAT INDEX VALUES OVER
105 DEGREES. A HEAT ADVISORY HAS BEEN POSTED FOR MUCH OF ARKANSAS
THROUGH SUNDAY.

ONCE THE FRONT ARRIVES EARLY NEXT WEEK...IT WILL NOT BE QUITE SO
HOT. TEMPERATURES WILL BE CLOSER TO NORMAL...ESPECIALLY IN NORTHERN
AND EASTERN SECTIONS OF THE STATE AWAY FROM HIGH PRESSURE.

SURROUNDING THE FRONT...THERE WILL BE ISOLATED TO SCATTERED SHOWERS
AND THUNDERSTORMS. CHANCES FOR RAIN WILL BE HIGHEST IN THE NORTH AND
EAST...OR IN AREAS NORTH OF THE FRONT. SOME STORMS COULD BE
SEVERE...WITH DAMAGING WINDS POSSIBLE.

.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.

46/59

In the hours before

Special weather statement, Aug 4, 4:32 PM CDT, 2 hours 16 minutes before

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Local storm report, Aug 4, 5:20 PM CDT, 1 hour 28 minutes before

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Local storm report, Aug 4, 5:34 PM CDT, 1 hour 14 minutes before

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Special weather statement, Aug 4, 5:47 PM CDT, 1 hour 1 minute before

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Special weather statement, Aug 4, 6:07 PM CDT, 41 minutes before

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Special weather statement, Aug 4, 6:10 PM CDT, 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
610 PM CDT THU AUG 4 2011

ARZ037-042340-
SCOTT AR-
610 PM CDT THU AUG 4 2011

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SCOTT COUNTY UNTIL 645 PM
CDT...

AT 607 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHWEST OF WEEKS...OR 15 MILES SOUTH OF
HARTFORD...MOVING NORTHEAST AT 10 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN.

* LOCATIONS IMPACTED INCLUDE...
  BLACK FORK...         BATES...              WEEKS...
  COALDALE...           GIPSON...

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 3490 9446 3493 9445 3494 9444 3496 9441
      3495 9438 3476 9428 3473 9446
TIME...MOT...LOC 2310Z 247DEG 8KT 3481 9445

64

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 3:40 AM CDT	Excessive Heat Warning	LZK		11 hr
Aug 4, 3:40 AM CDT	Heat Advisory	LZK	Baxter, Cleburne, Conway, Fulton, Garland, Independence and 7 more	5 days
Aug 4, 5:40 AM CDT	Special Weather Statement	LZK	Perry	30 min
Aug 4, 5:46 AM CDT	Severe Thunderstorm Warning	LZK	Conway, Perry, Yell	34 min
Aug 4, 7:13 AM CDT	Special Weather Statement	LZK	Perry	47 min
Aug 4, 7:44 AM CDT	Special Weather Statement	LZK	Perry	31 min
Aug 4, 8:48 AM CDT	Special Weather Statement	LZK	Perry	42 min
Aug 4, 9:48 AM CDT	Special Weather Statement	LZK	Van Buren	47 min
Aug 4, 10:13 AM CDT	Special Weather Statement	LZK	Conway	32 min
Aug 4, 12:13 PM CDT	Special Weather Statement	LZK	Izard	47 min
Aug 4, 2:48 PM CDT	Special Weather Statement	LZK	Drew	47 min
Aug 4, 3:09 PM CDT	Severe Thunderstorm Warning	LZK	Drew	36 min
Aug 4, 3:15 PM CDT	Severe Thunderstorm Warning	LZK	Drew	30 min
Aug 4, 3:38 PM CDT	Special Weather Statement	LZK	Bradley	32 min
Aug 4, 3:43 PM CDT	Severe Thunderstorm Warning	LZK	Drew	32 min
Aug 4, 3:50 PM CDT	Severe Thunderstorm Warning	LZK	Bradley	25 min
Aug 4, 4:12 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun	19 min
Aug 4, 4:23 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Cleveland	37 min
Aug 4, 4:29 PM CDT	Special Weather Statement	LZK	Calhoun	46 min
Aug 4, 4:32 PM CDT	Special Weather Statement	LZK	Polk	33 min
Aug 4, 4:35 PM CDT	Severe Thunderstorm Warning	LZK	Polk, Scott	25 min
Aug 4, 4:42 PM CDT	Severe Thunderstorm Warning	LZK	Calhoun, Dallas, Ouachita	33 min
Aug 4, 4:55 PM CDT	Severe Thunderstorm Warning	LZK	Scott	35 min
Aug 4, 4:56 PM CDT	Severe Thunderstorm Warning	LZK	Calhoun, Cleveland, Dallas	34 min
Aug 4, 5:11 PM CDT	Severe Thunderstorm Warning	LZK	Polk	24 min
Aug 4, 5:19 PM CDT	Severe Thunderstorm Warning	LZK	Cleveland, Dallas	26 min
Aug 4, 5:24 PM CDT	Severe Thunderstorm Warning	LZK	Cleveland, Dallas	36 min
Aug 4, 5:42 PM CDT	Severe Thunderstorm Warning	LZK	Dallas	22 min
Aug 4, 5:47 PM CDT	Special Weather Statement	LZK	Ouachita	28 min
Aug 4, 6:07 PM CDT	Special Weather Statement	LZK	Polk	28 min
Aug 4, 6:10 PM CDT	Special Weather Statement	LZK	Scott	30 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2011 Every 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.