Alert archive / Arkansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 545, NWS Little Rock, AR

October 30, 20094 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Oct 30, 2009, 12:38 AM CDT for 4 counties in Arkansas. It was in force for 52 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: Oct 30, 2009, 12:38 AM CDT (05:38 UTC)
Expired: Oct 30, 2009, 1:30 AM CDT
In force: 52 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Faulkner County, AR, Lonoke County, AR, Pulaski County, AR, White County, AR

The radar

The Little Rock radar (KLZK), 24 km from the middle of the area, began a volume at 05:39 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 00:00Z, 5.6 hours before the alert went out and 194 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: 1460 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 483 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 548 m²/s²
0-3 km storm-relative helicity: 584 m²/s²
Significant tornado parameter: 3.9
Supercell composite: 25.8

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 Oct 29, 6:53 PM CDT, 5 hours 45 minutes earlier.

Area forecast discussion, Oct 29, 6:53 PM CDT, 5 hours 45 minutes before

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Hazardous weather outlook, Oct 29, 3:32 PM CDT, 9 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
332 PM CDT THU OCT 29 2009

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-301000-
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-
332 PM CDT THU OCT 29 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO INCREASE AND OVERSPREAD
THE AREA THIS AFTERNOON AS LOW PRESSURE MOVES SLOWLY TOWARDS
ARKANSAS FROM THE SOUTHERN PLAINS. INITIALLY...THE ACTIVITY WILL BE
ASSOCIATED WITH A WARM FRONT LIFTING NORTHWARD ACROSS ARKANSAS.
LOCALLY HEAVY RAINFALL WILL BE POSSIBLE THIS AFTERNOON THROUGH
TONIGHT. AS A RESULT...A FLASH FLOOD WATCH REMAINS IN AFFECT FOR THE
AREA THIS AFTERNOON AND TONIGHT. A TORNADO WATCH IS IN EFFECT
THROUGH 9 PM FOR MUCH OF CENTRAL AND SOUTH ARKANSAS. DAMAGING WINDS
AND TORNADOES WILL BE POSSIBLE THROUGH THIS EVENING.

A FEW STRONG OR SEVERE STORMS WILL BE POSSIBLE TODAY...WITH HAIL AND
DAMAGING WINDS THE MAIN CONCERNS.

BY TONIGHT...THE LOW PRESSURE SYSTEM WILL BEGIN LIFTING TO THE NORTH
OF ARKANSAS. MEANWHILE...A COLD FRONT TRAILING SOUTHWARD FROM THE
LOW...WILL PUSH INTO WESTERN ARKANSAS THIS EVENING AND EVENTUALLY
INTO THE CENTRAL PART OF THE STATE LATE TONIGHT. A LINE OF STORMS IS
FORECAST TO FORM ALONG THE FRONT AS IT TRACKS EASTWARD TONIGHT.

SEVERE STORMS WILL BE POSSIBLE AS THE FRONT MOVES ACROSS THE WESTERN
PART OF THE STATE TONIGHT. DAMAGING WINDS WILL BE THE MAIN THREAT
FROM THIS LINE OF STORMS. WITH THE GROUND WELL SATURATED...IT WILL
NOT TAKE MUCH WIND TO BRING DOWN TREES. ISOLATED TORNADOES CANNOT BE
RULED OUT AS WELL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE AFOREMENTIONED COLD FRONT WILL CONTINUE WORKING ACROSS THE
EASTERN PART OF ARKANSAS ON FRIDAY...WITH SHOWERS AND THUNDERSTORMS
PERSISTING. ELSEHWERE...WIDESPREAD RAIN WILL LINGER FOR MUCH OF THE
DAY BEHIND THE FRONT.

ANY ADDITIONAL HEAVY RAINFALL WILL ONLY INCREASE THE THREAT OF FLASH
FLOODING AND RIVER FLOODING. THE FLASH FLOOD WATCH WILL REMAIN IN
EFFECT THROUGH FRIDAY NIGHT FOR MUCH OF ARKANSAS. RAINFALL TOTALS
ACROSS THE WATCH AREA ARE EXPECTED TO RANGE BETWEEN 2 AND 4
INCHES...WITH PARTS OF CENTRAL AND EASTERN ARKANSAS POSSIBLY SEEING
UPWARDS OF 6 INCHES OR MORE BEFORE THE RAIN TAPERS OFF FRIDAY NIGHT.

THE STORM SYSTEM WILL DEPART TO THE EAST OF THE REGION BY SATURDAY.
HIGH PRESSURE WILL FOLLOW...BRINGING SOME MUCH NEEDED DRIER
CONDITIONS TO THE MID SOUTH FOR THE UPCOMING WEEKEND AND THE FIRST
HALF OF NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION COULD BE NEEDED LATER TODAY AND TONIGHT.

&&

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

44

In the hours before

Local storm report, Oct 29, 6:40 PM CDT, 5 hours 58 minutes before

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Local storm report, Oct 29, 6:55 PM CDT, 5 hours 43 minutes before

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Local storm report, Oct 29, 6:59 PM CDT, 5 hours 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 7:12 PM CDT	Flash Flood Warning	LZK	Calhoun, Clark, Cleburne, Cleveland, Conway, Dallas and 22 more	6 hr
Oct 29, 8:39 PM CDT	Flash Flood Warning	LZK	Cleburne, Fulton, Independence, Izard, Jackson, Lonoke and 6 more	10 hr
Oct 29, 9:04 PM CDT	River Flood Warning	LZK	Clay	14 hr
Oct 29, 9:59 PM CDT	River Flood Warning	LZK	Independence, Jackson	8 days
Oct 29, 10:03 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Dallas	42 min
Oct 29, 10:54 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Bradley, Cleveland, Drew, Jefferson, Lincoln	51 min
Oct 29, 11:08 PM CDT	Flash Flood Warning	LZK	Arkansas, Bradley, Calhoun, Cleveland, Dallas, Drew and 6 more	7 hr
Oct 29, 11:58 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Desha, Jefferson, Lincoln, Monroe, Prairie	47 min
Oct 30, 12:16 AM CDT	Flash Flood Warning	LZK	Arkansas, Desha, Drew, Lincoln, Monroe	6 hr
Oct 30, 12:55 AM CDT	Flash Flood Warning	LZK	Calhoun, Clark, Cleburne, Cleveland, Conway, Dallas and 13 more	5 hr
Oct 30, 6:05 AM CDT	Areal Flood Warning	LZK	Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 29 more	12 hr
Oct 30, 7:09 AM CDT	River Flood Warning	LZK	Franklin	7 hr
Oct 30, 12:07 PM CDT	River Flood Warning	LZK	Searcy	9 hr

Nearby

Severe Thunderstorm Warnings in Arkansas, 2009 Every severe thunderstorm warning in 2009

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.