Alert archive / Tennessee / Flash Flood Warnings in 2009

Flash Flood Warning 70, NWS Huntsville, AL

September 9, 2009Lincoln County, Tennessee

NWS Huntsville, AL issued this flash flood warning at Sep 9, 2009, 5:39 PM CDT for Lincoln County, Tennessee. It was in force for 111 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 9, 2009, 5:39 PM CDT (22:39 UTC)
Expired: Sep 9, 2009, 7:30 PM CDT
In force: 111 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Lincoln County, TN

The radar

The Northeast Alabama radar (KHTX), 52 km from the middle of the area, began a volume at 22:41 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.7 hours before the alert went out and 275 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: 591 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Sep 8, 6:15 PM CDT, 23 hours 24 minutes earlier.

Area forecast discussion, Sep 8, 6:15 PM CDT, 23 hours 24 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
Sep 9, 4:07 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	23 min

Nearby

Flash Flood Warnings in Tennessee, 2009 Every flash flood warning in 2009

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.