Alert archive / Alabama / Special Weather Statements in 2019

Special Weather Statement, NWS Birmingham, AL

February 21, 2019Shelby County, Alabama

NWS Birmingham, AL issued this special weather statement at Feb 21, 2019, 5:49 PM CST for Shelby County, Alabama. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 21, 2019, 5:49 PM CST (23:49 UTC)
Expired: Feb 21, 2019, 6:15 PM CST
In force: 26 min
Issued by: NWS Birmingham, AL

County Shelby County, AL

The radar

The Birmingham radar (KBMX), 28 km from the middle of the area, began a volume at 23:53 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, 11.8 hours before the alert went out and 186 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: 411 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Feb 21, 4:32 PM CST, 1 hour 17 minutes earlier.

Area forecast discussion, Feb 21, 4:32 PM CST, 1 hour 17 minutes before

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Hazardous weather outlook, Feb 21, 4:45 PM CST, 1 hour 4 minutes before

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In the hours before

Special weather statement, Feb 21, 3:25 PM CST, 2 hours 24 minutes before

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Special weather statement, Feb 21, 4:01 PM CST, 1 hour 48 minutes before

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Special weather statement, Feb 21, 5:49 PM CST, 0 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
Feb 20, 7:06 PM CST	Special Weather Statement	BMX	Perry	24 min
Feb 20, 7:51 PM CST	River Flood Warning	BMX	Greene, Hale, Marengo, Sumter, Tuscaloosa	5 days
Feb 20, 7:58 PM CST	River Flood Warning	BMX	Sumter	5 days
Feb 20, 8:38 PM CST	Special Weather Statement	BMX	Tallapoosa	37 min
Feb 20, 9:54 PM CST	Areal Flood Advisory	BMX	Autauga, Dallas, Elmore	3 hr
Feb 20, 10:24 PM CST	Dense Fog Advisory	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 18 more	11 hr
Feb 20, 11:59 PM CST	Special Weather Statement	BMX	Greene	46 min
Feb 21, 12:48 AM CST	Special Weather Statement	BMX	Sumter	42 min
Feb 21, 1:15 AM CST	Areal Flood Advisory	BMX	Sumter	4 hr
Feb 21, 10:10 AM CST	River Flood Warning	BMX	Calhoun, Cherokee, Coosa, Etowah, St. Clair, Shelby and 1 more	12 days
Feb 21, 10:10 AM CST	River Flood Warning	BMX	Chilton, Coosa, Elmore, St. Clair, Shelby, Talladega	21 days
Feb 21, 10:52 AM CST	River Flood Warning	BMX	Calhoun, Cherokee, Etowah, St. Clair	16 days
Feb 21, 2:25 PM CST	Areal Flood Advisory	BMX	Marion	3 hr
Feb 21, 3:25 PM CST	Special Weather Statement	BMX	Lee	35 min
Feb 21, 4:01 PM CST	Special Weather Statement	BMX	Greene, Sumter	29 min

Nearby

Special Weather Statements in Alabama, 2019 Every special weather statement 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.