Alert archive / Mississippi / Flash Flood Warnings in 2010

Flash Flood Warning 95, NWS Memphis, TN

May 21, 2010Itawamba County, Lee County, Pontotoc County, Mississippi

NWS Memphis, TN issued this flash flood warning at May 21, 2010, 4:11 AM CDT for Itawamba County, Lee County, Pontotoc County, Mississippi. It was in force for 6 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 21, 2010, 4:11 AM CDT (09:11 UTC)
Expired: May 21, 2010, 10:15 AM CDT
In force: 6 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Itawamba County, MS, Lee County, MS, Pontotoc County, MS

The radar

The Columbus AFB radar (KGWX), 53 km from the middle of the area, began a volume at 09:12 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, 9.2 hours before the alert went out and 131 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: 65 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 1470 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Memphis, TN wrote its last area forecast discussion before this flash flood warning went out at May 20, 11:59 PM CDT, 4 hours 12 minutes earlier.

Area forecast discussion, May 20, 11:59 PM CDT, 4 hours 12 minutes before

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Hazardous weather outlook, May 20, 8:34 PM CDT, 7 hours 37 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
May 21, 11:34 AM CDT	River Flood Warning	MEG	Dyer, Lake	4 days
May 21, 4:40 AM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Chickasaw, Lafayette, Pontotoc, Union	36 min
May 21, 5:36 AM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc and 2 more	6 hr
May 21, 7:08 AM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw, Monroe	3 hr
May 21, 7:33 AM CDT	River Flood Warning	MEG	Lowndes, Monroe	5 days
May 21, 9:25 AM CDT	River Flood Warning	MEG	Monroe	40 hr

Nearby

Flash Flood Warnings in Mississippi, 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.