Alert archive / Arkansas / Flash Flood Warnings in 2009

Flash Flood Warning 41, NWS Little Rock, AR

May 12, 20096 counties in Arkansas

NWS Little Rock, AR issued this flash flood warning at May 12, 2009, 3:35 PM CDT for 6 counties in Arkansas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 12, 2009, 3:35 PM CDT (20:35 UTC)
Expired: May 12, 2009, 5:47 PM CDT
In force: 2 hr
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

Counties Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Ouachita County, AR

The radar

The Little Rock radar (KLZK), 124 km from the middle of the area, began a volume at 20:36 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, 8.6 hours before the alert went out and 178 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: 23 J/kg
Mixed-layer CIN: -496 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at May 12, 3:01 PM CDT, 34 minutes earlier.

Area forecast discussion, May 12, 3:01 PM CDT, 34 minutes before

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Hazardous weather outlook, May 12, 5:00 AM CDT, 10 hours 35 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
500 AM CDT TUE MAY 12 2009

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-131000-
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-
500 AM CDT TUE MAY 12 2009

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE FORECAST TODAY ACROSS
ARKANSAS...ESPECIALLY THIS AFTERNOON. THIS IS IN RESPONSE TO THE
FRONT THAT IS STALLED OVER NORTHERN LOUISIANA THIS MORNING...IS
EXPECTED TO LIFT NORTHWARD ACROSS THE STATE...AS A DEVELOPING
SURFACE LOW PRESSURE SYSTEM OUT WEST MOVES NORTHEAST. SOME
ADDITIONAL UPPER LEVEL ENERGY WILL ALSO INTERACT WITH THE
FRONT...AND THIS IS EXPECTED TO TRIGGER SHOWERS AND THUNDERSTORMS.
THE MAIN AREAS THAT WILL RECEIVE THE BULK OF THE RAIN ARE CENTRAL
AND NORTHERN SECTIONS OF THE STATE. AREAS OF HEAVY RAIN WILL BE
POSSIBLE. THE OVERALL THREAT OF SEVERE STORMS WILL BE LOW...WITH
ONLY AN ISOLATED STRONG TO SEVERE STORM POSSIBLE. THE CHANCE OF RAIN
WILL ALSO BE IN THE TONIGHT PERIOD.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ANOTHER COLD FRONT WILL MOVE FROM THE PLAINS INTO ARKANSAS WEDNESDAY
NIGHT AND THURSDAY...AND BRING ANOTHER ROUND OF SHOWERS AND
THUNDERSTORMS...WITH HEAVY RAIN POSSIBLE. ISOLATED STRONG TO SEVERE
STORMS WILL BE POSSIBLE ESPECIALLY OVER NORTHERN ARKANSAS. THIS
FRONT IS EXPECTED TO STALL OVER THE STATE ON THURSDAY...THEN LIFT
BACK NORTH BY FRIDAY. THIS WILL KEEP SHOWERS AND THUNDERSTORM IN THE
FORECAST THROUGH SUNDAY. NOT UNTIL THE COLD FRONT SAGS SOUTH OUT OF
ARKANSAS LATER SUNDAY TO MONDAY...WILL THE CHANCE OF RAIN
SIGNIFICANTLY DECREASE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED WITH THE ISOLATED NATURE OF THE
SEVERE STORM THREAT.

&&

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

59

In the hours before

Special weather statement, May 12, 12:27 PM CDT, 3 hours 8 minutes before

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Local storm report, May 12, 1:31 PM CDT, 2 hours 4 minutes before

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Local storm report, May 12, 2:09 PM CDT, 1 hour 26 minutes before

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Local storm report, May 12, 2:37 PM CDT, 58 minutes before

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Special weather statement, May 12, 3:23 PM CDT, 12 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
May 11, 7:48 PM CDT	River Flood Warning	LZK	Clark, Nevada, Ouachita	3 days
May 12, 10:34 AM CDT	Flash Flood Warning	LZK	Montgomery, Pike, Polk, Scott	3 hr
May 12, 12:34 PM CDT	Flash Flood Warning	LZK	Clark, Hot Spring, Pike, Polk	3 hr

Nearby

Flash Flood Warnings in Arkansas, 2009 Every flash flood 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.