Alert archive / Alabama / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 59, NWS Birmingham, AL

April 18, 2019Sumter County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 18, 2019, 4:31 PM CDT for Sumter County, Alabama. It was in force for 59 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: Apr 18, 2019, 4:31 PM CDT (21:31 UTC)
Expired: Apr 18, 2019, 5:30 PM CDT
In force: 59 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sumter County, AL

The radar

The Columbus AFB radar (KGWX), 146 km from the middle of the area, began a volume at 21:35 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 18, 3:49 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.5 hours before the alert went out and 148 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: 960 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 43 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 Birmingham, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 18, 3:33 PM CDT, 58 minutes earlier.

Area forecast discussion, Apr 18, 3:33 PM CDT, 58 minutes before

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Hazardous weather outlook, Apr 18, 2:11 PM CDT, 2 hours 20 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 18, 5:07 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens	53 min
Apr 18, 5:07 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens	53 min
Apr 18, 5:45 PM CDT	Severe Thunderstorm Warning	BMX	Hale, Tuscaloosa	60 min
Apr 18, 5:53 PM CDT	Special Weather Statement	BMX	Pickens	52 min
Apr 18, 6:15 PM CDT	Severe Thunderstorm Warning	BMX	Tuscaloosa	45 min
Apr 18, 6:20 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Perry	70 min
Apr 18, 6:24 PM CDT	Severe Thunderstorm Warning	BMX	Lamar	51 min
Apr 18, 6:32 PM CDT	Severe Thunderstorm Warning	BMX	Fayette	73 min
Apr 18, 6:38 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson	82 min
Apr 18, 6:46 PM CDT	Severe Thunderstorm Warning	BMX	Tuscaloosa	44 min
Apr 18, 6:51 PM CDT	Special Weather Statement	BMX	Marion	39 min
Apr 18, 6:53 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Shelby	82 min
Apr 18, 6:58 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	65 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2019 Every severe thunderstorm 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.