Alert archive / Alabama / Flash Flood Warnings in 2010

Flash Flood Warning 53, NWS Huntsville, AL

August 17, 2010Madison County, Alabama

NWS Huntsville, AL issued this flash flood warning at Aug 17, 2010, 9:41 AM CDT for Madison County, Alabama. 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 17, 2010, 9:41 AM CDT (14:41 UTC)
Expired: Aug 17, 2010, 11:54 AM CDT
In force: 2 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 46 km from the middle of the area, began a volume at 14:42 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

Nashville Metro, TN (KBNA), launched 12:00Z, 2.7 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Huntsville, AL wrote its last area forecast discussion before this flash flood warning went out at Aug 17, 9:00 AM CDT, 41 minutes earlier.

Area forecast discussion, Aug 17, 9:00 AM CDT, 41 minutes before

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Hazardous weather outlook, Aug 17, 9:35 AM CDT, 6 minutes before

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In the hours before

Local storm report, Aug 17, 9:09 AM CDT, 32 minutes before

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Local storm report, Aug 17, 9:19 AM CDT, 22 minutes before

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Local storm report, Aug 17, 9:29 AM CDT, 12 minutes before

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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 8:32 AM CDT	Flash Flood Warning	HUN	Jackson	3 hr
Aug 17, 11:29 AM CDT	Areal Flood Warning	HUN	Jackson	3 hr
Aug 17, 6:38 PM CDT	Special Weather Statement	HUN	Cullman	52 min
Aug 17, 6:49 PM CDT	Special Weather Statement	HUN	Lawrence	26 min

Nearby

Flash Flood Warnings in Alabama, 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.