Alert archive / Arkansas / Flash Flood Warnings in 2011

Flash Flood Warning 127, NWS Little Rock, AR

August 17, 2011Polk County, Scott County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Aug 17, 2011, 7:29 PM CDT for Polk County, Scott County, Arkansas. It was in force for 3 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: Aug 17, 2011, 7:29 PM CDT (00:29 UTC)
Expired: Aug 17, 2011, 10:00 PM CDT
In force: 3 hr
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

Counties Polk County, AR, Scott County, AR

The radar

The Western Arkansas radar (KSRX), 71 km from the middle of the area, began a volume at 00:31 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

Springfield, MO (KSGF), launched 00:00Z, 0.5 hours before the alert went out and 250 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: 3810 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

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 17, 3:19 PM CDT, 4 hours 10 minutes earlier.

Area forecast discussion, Aug 17, 3:19 PM CDT, 4 hours 10 minutes before

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Hazardous weather outlook, Aug 17, 5:00 AM CDT, 14 hours 29 minutes before

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In the hours before

Special weather statement, Aug 17, 2:08 PM CDT, 5 hours 21 minutes before

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Special weather statement, Aug 17, 2:39 PM CDT, 4 hours 50 minutes before

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Special weather statement, Aug 17, 3:48 PM CDT, 3 hours 41 minutes before

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Special weather statement, Aug 17, 5:10 PM CDT, 2 hours 19 minutes before

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Special weather statement, Aug 17, 5:57 PM CDT, 1 hour 32 minutes before

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Special weather statement, Aug 17, 7:12 PM CDT, 17 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 17, 7:12 PM CDT	Special Weather Statement	LZK	Searcy	43 min
Aug 18, 5:32 AM CDT	Special Weather Statement	LZK	Cleburne, Stone	28 min
Aug 18, 6:14 AM CDT	Special Weather Statement	LZK	Cleburne, White	31 min
Aug 18, 6:44 AM CDT	Special Weather Statement	LZK	White	31 min
Aug 18, 7:49 AM CDT	Severe Thunderstorm Warning	LZK	Monroe, Woodruff	26 min
Aug 18, 8:00 AM CDT	Special Weather Statement	LZK	Baxter	45 min
Aug 18, 8:51 AM CDT	Special Weather Statement	LZK	Fulton, Sharp	44 min
Aug 18, 4:19 PM CDT	Special Weather Statement	LZK	Johnson	46 min

Nearby

Flash Flood Warnings in Arkansas, 2011 Every flash flood 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.