Alert archive / Alabama / Hard Freeze Warnings in 2011

Hard Freeze Warning 1, NWS Birmingham, AL

January 12, 201139 counties in Alabama

NWS Birmingham, AL issued this hard freeze warning at Jan 12, 2011, 3:13 AM CST for 39 counties in Alabama. It took effect at Jan 12, 2011, 9:00 PM CST. It was in force for 12 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: Jan 12, 2011, 3:13 AM CST (09:13 UTC)
In effect from: Jan 12, 2011, 9:00 PM CST
Expired: Jan 13, 2011, 9:00 AM CST
In force: 12 hr
Issued by: NWS Birmingham, AL

All 39 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Marion County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 22 km from the middle of the area, began a volume at 09:10 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

Birmingham, AL (KBMX), launched 00:00Z, 9.2 hours before the alert went out and 23 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: 777 m above ground
0-6 km bulk shear: 93 kt
0-1 km storm-relative helicity: -159 m²/s²
0-3 km storm-relative helicity: -128 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 hard freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this hard freeze warning went out at Jan 11, 11:34 PM CST, 3 hours 39 minutes earlier.

Area forecast discussion, Jan 11, 11:34 PM CST, 3 hours 39 minutes before

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Hazardous weather outlook, Jan 11, 6:26 PM CST, 8 hours 47 minutes before

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In the hours before

Special weather statement, Jan 12, 2:59 AM CST, 14 minutes before

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Special weather statement, Jan 12, 3:03 AM CST, 10 minutes before

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Nearby

Hard Freeze Warnings in Alabama, 2011 Every hard freeze warning in 2011

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.