Alert archive / Alabama / Freeze Warnings in 2007

Freeze Warning 1, NWS Birmingham, AL

April 5, 200721 counties in Alabama

NWS Birmingham, AL issued this freeze warning at Apr 5, 2007, 1:59 PM CDT for 21 counties in Alabama. It took effect at Apr 5, 2007, 10:26 PM CDT. It was in force for 35 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: Apr 5, 2007, 1:59 PM CDT (18:59 UTC)
In effect from: Apr 5, 2007, 10:26 PM CDT
Expired: Apr 7, 2007, 9:00 AM CDT
In force: 35 hr
Issued by: NWS Birmingham, AL

All 21 counties

Blount County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 47 km from the middle of the area, began a volume at 19:03 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, 7.0 hours before the alert went out and 195 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: 1580 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -168 m²/s²
0-3 km storm-relative helicity: -67 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 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 freeze warning went out at Apr 4, 6:32 PM CDT, 19 hours 27 minutes earlier.

Area forecast discussion, Apr 4, 6:32 PM CDT, 19 hours 27 minutes before

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Hazardous weather outlook, Apr 4, 3:00 PM CDT, 22 hours 59 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 5:07 AM CDT	Freeze Watch	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 3 more	24 hr
Apr 5, 5:07 AM CDT	Freeze Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	41 hr

Nearby

Freeze Warnings in Alabama, 2007 Every freeze 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.