Alert archive / Arkansas / Flash Flood Warnings in 2010

Flash Flood Warning 268, NWS Memphis, TN

August 10, 2010Cross County, St. Francis County, Arkansas

NWS Memphis, TN issued this flash flood warning at Aug 10, 2010, 12:54 PM CDT for Cross County, St. Francis 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: Aug 10, 2010, 12:54 PM CDT (17:54 UTC)
Expired: Aug 10, 2010, 3:00 PM CDT
In force: 2 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Cross County, AR, St. Francis County, AR

The radar

The Memphis radar (KNQA), 83 km from the middle of the area, began a volume at 17:57 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 12:00Z, 5.9 hours before the alert went out and 82 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: 2173 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1296 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.5

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 Memphis, TN wrote its last area forecast discussion before this flash flood warning went out at Aug 10, 9:32 AM CDT, 3 hours 22 minutes earlier.

Area forecast discussion, Aug 10, 9:32 AM CDT, 3 hours 22 minutes before

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Hazardous weather outlook, Aug 10, 4:51 AM CDT, 8 hours 3 minutes before

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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 2:26 PM CDT	Excessive Heat Watch	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	13 hr
Aug 10, 3:29 PM CDT	Flash Flood Warning	MEG	Decatur, Hardin	2 hr
Aug 10, 5:25 PM CDT	Flash Flood Warning	MEG	Shelby	2 hr
Aug 10, 3:57 PM CDT	Flash Flood Warning	MEG	Randolph	89 min

Nearby

Flash Flood Warnings in Arkansas, 2010 Every flash flood warning in 2010

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.