Alert archive / Alabama / Freeze Warnings in 2019

Freeze Warning 6, NWS Birmingham, AL

October 31, 201918 counties in Alabama

NWS Birmingham, AL issued this freeze warning at Oct 31, 2019, 3:03 AM CDT for 18 counties in Alabama. It took effect at Nov 1, 2019, 1:00 AM CDT. It was in force for 8 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: Oct 31, 2019, 3:03 AM CDT (08:03 UTC)
In effect from: Nov 1, 2019, 1:00 AM CDT
Expired: Nov 1, 2019, 9:00 AM CDT
In force: 8 hr
Issued by: NWS Birmingham, AL

Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne 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, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 57 km from the middle of the area, began a volume at 08:06 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 00:00Z, 8.1 hours before the alert went out and 208 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: 370 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 677 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.4

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 Oct 31, 12:02 AM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Oct 31, 12:02 AM CDT, 3 hours 1 minute 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
Oct 31, 6:43 AM CDT	Special Weather Statement	BMX	Bibb	32 min
Oct 31, 7:23 AM CDT	Special Weather Statement	BMX	Shelby	52 min
Oct 31, 11:08 AM CDT	Special Weather Statement	BMX	Lee	37 min

Nearby

Freeze Warnings in Alabama, 2019 Every freeze warning in 2019

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.