Alert archive / Alabama / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 91, NWS Huntsville, AL

July 19, 2007Jackson County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 19, 2007, 1:46 PM CDT for Jackson County, Alabama. It was in force for 14 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: Jul 19, 2007, 1:46 PM CDT (18:46 UTC)
Expired: Jul 19, 2007, 2:00 PM CDT
In force: 14 min
Issued by: NWS Huntsville, AL
Area: Counties, with a storm outline in the text

County Jackson County, AL

The radar

The Northeast Alabama radar (KHTX), 19 km from the middle of the area, began a volume at 18:49 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, 6.8 hours before the alert went out and 160 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: 2416 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 683 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: -51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 19, 10:26 AM CDT, 3 hours 20 minutes earlier.

Area forecast discussion, Jul 19, 10:26 AM CDT, 3 hours 20 minutes before

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Hazardous weather outlook, Jul 19, 12:53 PM CDT, 53 minutes before

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In the hours before

Special weather statement, Jul 19, 12:15 PM CDT, 1 hour 31 minutes before

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Special weather statement, Jul 19, 12:30 PM CDT, 1 hour 16 minutes before

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Special weather statement, Jul 19, 12:42 PM CDT, 1 hour 4 minutes before

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Special weather statement, Jul 19, 1:15 PM CDT, 31 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
Jul 19, 1:57 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	18 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2007 Every severe thunderstorm 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.