Alert archive / Arkansas / Flash Flood Warnings in 2009

Flash Flood Warning 99, NWS Little Rock, AR

August 18, 2009Perry County, Pulaski County, Saline County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Aug 18, 2009, 7:19 PM CDT for Perry County, Pulaski County, Saline County, Arkansas. It was in force for 76 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 18, 2009, 7:19 PM CDT (00:19 UTC)
Expired: Aug 18, 2009, 8:35 PM CDT
In force: 76 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

Counties Perry County, AR, Pulaski County, AR, Saline County, AR

The radar

The Little Rock radar (KLZK), 35 km from the middle of the area, began a volume at 00:22 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, 0.3 hours before the alert went out and 246 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: 2159 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 18, 6:37 PM CDT, 42 minutes earlier.

Area forecast discussion, Aug 18, 6:37 PM CDT, 42 minutes before

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Hazardous weather outlook, Aug 18, 9:20 AM CDT, 9 hours 59 minutes before

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In the hours before

Special weather statement, Aug 18, 3:44 PM CDT, 3 hours 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
344 PM CDT TUE AUG 18 2009

ARZ032-033-044-045-182125-
FAULKNER-LONOKE-PULASKI-WHITE-
344 PM CDT TUE AUG 18 2009

...SIGNIFICANT WEATHER ALERT FOR FAULKNER...LONOKE...PULASKI AND
WHITE COUNTIES UNTIL 425 PM CDT...

AT 343 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR VILONIA...MOVING NORTHEAST AT 10 MPH.

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

THIS STORM WILL OTHERWISE IMPACT OTTO AND VILONIA..

TORRENTIAL DOWNPOURS MAY CAUSE LOCALIZED MINOR FLOODING IN LOW LYING
AREAS. MOTORISTS SHOULD BE ADVISED TO EXPECT REDUCED VISIBILITY DUE
TO THE VERY HEAVY RAIN.

56

Local storm report, Aug 18, 4:19 PM CDT, 3 hours before

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Special weather statement, Aug 18, 4:56 PM CDT, 2 hours 23 minutes before

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Local storm report, Aug 18, 5:39 PM CDT, 1 hour 40 minutes before

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Local storm report, Aug 18, 6:11 PM CDT, 1 hour 8 minutes before

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Local storm report, Aug 18, 6:56 PM CDT, 23 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
Aug 19, 3:18 PM CDT	Severe Thunderstorm Warning	LZK	Johnson	57 min
Aug 19, 3:52 PM CDT	Flash Flood Warning	LZK	Johnson, Pope	2 hr
Aug 19, 3:56 PM CDT	Severe Thunderstorm Warning	LZK	Fulton, Sharp	52 min
Aug 19, 4:19 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Pope	56 min

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.