Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 189, NWS Birmingham, AL

August 11, 2020Pike County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 11, 2020, 3:05 PM CDT for Pike County, Alabama. It was in force for 28 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: Aug 11, 2020, 3:05 PM CDT (20:05 UTC)
Expired: Aug 11, 2020, 3:33 PM CDT
In force: 28 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pike County, AL

The radar

The Ft Rucker radar (KEOX), 59 km from the middle of the area, began a volume at 20:07 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 12:00Z, 8.1 hours before the alert went out and 172 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: 953 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 63 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 Aug 11, 2:31 PM CDT, 34 minutes earlier.

Area forecast discussion, Aug 11, 2:31 PM CDT, 34 minutes before

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Hazardous weather outlook, Aug 11, 2:20 PM CDT, 45 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
220 PM CDT Tue Aug 11 2020

ALZ011>015-017>050-122230-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
220 PM CDT Tue Aug 11 2020

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Isolated strong to severe thunderstorms are possible this afternoon.
Brief damaging wind gusts of 60 mph or more and hail up to quarter
size could occur.

Heat indices may approach 105 degrees for areas along and west of
Interstate 65 this afternoon. Take extra precautions while outside.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Heat indices may approach 105 degrees Wednesday afternoon. Take
extra precautions while outside.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
this afternoon and evening. Please follow all local, state, and CDC
guidelines in regards to travel.

In the hours before

Special weather statement, Aug 11, 2:21 PM CDT, 44 minutes before

Special Weather Statement
National Weather Service Birmingham AL
221 PM CDT Tue Aug 11 2020

ALZ024-111945-
Jefferson AL-
221 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL JEFFERSON COUNTY
UNTIL 245 PM CDT...

At 221 PM CDT, Doppler radar was tracking a strong thunderstorm near
Tannehill Ironworks State Park, or near Bessemer. This storm was
nearly stationary.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bessemer, Promenade Tannehill, Bent Brook Golf Club, Bessemer Airport
and McAdory.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3334 8700 3331 8690 3330 8693 3328 8693
      3327 8695 3327 8697 3325 8698 3325 8707
      3328 8707 3328 8708 3330 8708
TIME...MOT...LOC 1921Z 274DEG 4KT 3329 8701

89^GSatterwhite

Special weather statement, Aug 11, 2:25 PM CDT, 40 minutes before

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Local storm report, Aug 11, 2:33 PM CDT, 32 minutes before

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Special weather statement, Aug 11, 2:55 PM CDT, 10 minutes before

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Special weather statement, Aug 11, 3:02 PM CDT, 3 minutes before

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Local storm report, Aug 11, 3:05 PM CDT, 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
Aug 10, 7:17 PM CDT	Special Weather Statement	BMX	Russell	43 min
Aug 10, 7:24 PM CDT	Special Weather Statement	BMX	Pike	51 min
Aug 10, 7:49 PM CDT	Special Weather Statement	BMX	Barbour	41 min
Aug 10, 8:31 PM CDT	Special Weather Statement	BMX	Barbour	29 min
Aug 10, 9:24 PM CDT	Special Weather Statement	BMX	Marshall	51 min
Aug 11, 12:08 PM CDT	Special Weather Statement	BMX	Chilton	37 min
Aug 11, 12:27 PM CDT	Special Weather Statement	BMX	Wilcox	33 min
Aug 11, 12:47 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Pike	23 min
Aug 11, 1:23 PM CDT	Special Weather Statement	BMX	Tallapoosa	37 min
Aug 11, 1:24 PM CDT	Special Weather Statement	BMX	Elmore	36 min
Aug 11, 1:30 PM CDT	Special Weather Statement	BMX	Lowndes	30 min
Aug 11, 1:37 PM CDT	Severe Thunderstorm Warning	BMX	Lowndes	22 min
Aug 11, 1:56 PM CDT	Special Weather Statement	BMX	Montgomery	34 min
Aug 11, 2:01 PM CDT	Special Weather Statement	BMX	Lowndes	29 min
Aug 11, 2:14 PM CDT	Special Weather Statement	BMX	Lowndes	31 min
Aug 11, 2:21 PM CDT	Special Weather Statement	BMX	Jefferson	24 min
Aug 11, 2:25 PM CDT	Special Weather Statement	BMX	Lee	35 min
Aug 11, 2:36 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Montgomery	39 min
Aug 11, 2:55 PM CDT	Special Weather Statement	BMX	Autauga	35 min
Aug 11, 3:02 PM CDT	Special Weather Statement	BMX	Pike	28 min
Aug 11, 3:12 PM CDT	Special Weather Statement	BMX	Macon	48 min
Aug 11, 3:12 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Dallas	15 min
Aug 11, 3:37 PM CDT	Special Weather Statement	BMX	Pike	38 min
Aug 11, 4:00 PM CDT	Special Weather Statement	BMX	Bullock	30 min
Aug 11, 4:20 PM CDT	Special Weather Statement	BMX	Bullock	40 min
Aug 11, 5:11 PM CDT	Special Weather Statement	BMX	Perry	34 min
Aug 11, 5:32 PM CDT	Special Weather Statement	BMX	Marengo	43 min
Aug 11, 5:37 PM CDT	Special Weather Statement	BMX	Jefferson	23 min
Aug 11, 5:59 PM CDT	Special Weather Statement	BMX	Shelby	31 min
Aug 11, 6:02 PM CDT	Special Weather Statement	BMX	Perry	43 min
Aug 11, 6:06 PM CDT	Special Weather Statement	BMX	Greene	39 min
Aug 11, 6:55 PM CDT	Special Weather Statement	BMX	Tuscaloosa	35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020 Every severe thunderstorm warning in 2020

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.