Alert archive / Arkansas / Flash Flood Warnings in 2007

Flash Flood Warning 6, NWS Little Rock, AR

October 3, 2007Johnson County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Oct 3, 2007, 5:01 AM CDT for Johnson County, 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: Oct 3, 2007, 5:01 AM CDT (10:01 UTC)
Expired: Oct 3, 2007, 7:30 AM CDT
In force: 2 hr
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

County Johnson County, AR

The radar

The Western Arkansas radar (KSRX), 87 km from the middle of the area, began a volume at 10:00 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, 10.0 hours before the alert went out and 329 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: 310 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1055 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Oct 3, 2:20 AM CDT, 2 hours 41 minutes earlier.

Area forecast discussion, Oct 3, 2:20 AM CDT, 2 hours 41 minutes before

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Hazardous weather outlook, Oct 3, 5:00 AM CDT, 1 minute before

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      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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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 3, 1:19 AM CDT	Flash Flood Warning	LZK	Johnson	3 hr
Oct 3, 4:47 AM CDT	Flash Flood Warning	LZK	Logan, Scott	3 hr

Nearby

Flash Flood Warnings in Arkansas, 2007 Every flash flood warning in 2007

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.