Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Birmingham, AL

May 20, 20174 counties in Alabama

NWS Birmingham, AL issued this special weather statement at May 20, 2017, 3:16 PM CDT for 4 counties in Alabama. It was in force for 44 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: May 20, 2017, 3:16 PM CDT (20:16 UTC)
Expired: May 20, 2017, 4:00 PM CDT
In force: 44 min
Issued by: NWS Birmingham, AL

Counties Autauga County, AL, Chilton County, AL, Elmore County, AL, Tallapoosa County, AL

The radar

The Maxwell AFB radar (KMXX), 57 km from the middle of the area, began a volume at 20:15 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, 8.3 hours before the alert went out and 73 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: 116 J/kg
Mixed-layer CIN: -342 J/kg
Mixed-layer LCL: 1347 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 20, 1:39 PM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, May 20, 1:39 PM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, May 20, 3:48 AM CDT, 11 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
348 AM CDT Sat May 20 2017

ALZ011>015-017>050-211200-
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-
348 AM CDT Sat May 20 2017

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

.DAY ONE...Today and Tonight.

Numerous showers and thunderstorms will develop this afternoon. A
couple isolated storms could produce damaging wind gusts up to 60
mph between noon and 8 PM west of a Montgomery to Heflin line.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
this afternoon and early this evening.

In the hours before

Special weather statement, May 20, 1:19 PM CDT, 1 hour 57 minutes before

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Special weather statement, May 20, 2:02 PM CDT, 1 hour 14 minutes before

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Special weather statement, May 20, 2:10 PM CDT, 1 hour 6 minutes before

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Special weather statement, May 20, 2:35 PM CDT, 41 minutes before

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Special weather statement, May 20, 2:55 PM CDT, 21 minutes before

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Special weather statement, May 20, 3:16 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
May 20, 12:35 PM CDT	Special Weather Statement	BMX	Autauga	40 min
May 20, 1:19 PM CDT	Special Weather Statement	BMX	Barbour	26 min
May 20, 2:02 PM CDT	Special Weather Statement	BMX	Russell	43 min
May 20, 2:10 PM CDT	Special Weather Statement	BMX	Lamar	35 min
May 20, 2:35 PM CDT	Special Weather Statement	BMX	Pickens	40 min
May 20, 2:55 PM CDT	Special Weather Statement	BMX	Autauga	35 min
May 20, 3:18 PM CDT	Special Weather Statement	BMX	Tuscaloosa	42 min
May 20, 3:31 PM CDT	Special Weather Statement	BMX	Marion	29 min
May 20, 3:36 PM CDT	Special Weather Statement	BMX	Blount	24 min
May 20, 3:41 PM CDT	Special Weather Statement	BMX	Jefferson, Tuscaloosa	49 min
May 20, 3:50 PM CDT	Special Weather Statement	BMX	Chilton, Coosa	25 min
May 20, 3:53 PM CDT	Special Weather Statement	BMX	Marion	22 min
May 20, 4:06 PM CDT	Areal Flood Advisory	BMX	Autauga, Elmore, Montgomery	114 min
May 20, 4:12 PM CDT	Special Weather Statement	BMX	Coosa, Shelby, Talladega	33 min
May 20, 4:19 PM CDT	Special Weather Statement	BMX	Blount, Jefferson, Walker, Winston	41 min
May 20, 4:44 PM CDT	Special Weather Statement	BMX	Shelby, Talladega	31 min
May 20, 4:55 PM CDT	Special Weather Statement	BMX	Blount, St. Clair, Talladega	50 min
May 20, 4:59 PM CDT	Special Weather Statement	BMX	Cleburne, Randolph	46 min
May 20, 5:16 PM CDT	Special Weather Statement	BMX	Pike	29 min
May 20, 5:17 PM CDT	Special Weather Statement	BMX	Blount, Calhoun, Cherokee, Etowah, St. Clair	58 min
May 20, 5:31 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	119 min
May 20, 5:45 PM CDT	Special Weather Statement	BMX	Barbour, Pike	45 min
May 20, 6:07 PM CDT	Special Weather Statement	BMX	Cherokee, Etowah	53 min
May 20, 6:08 PM CDT	Flash Flood Warning	BMX	Chilton, Jefferson, Shelby, Talladega	97 min
May 20, 6:11 PM CDT	Areal Flood Advisory	BMX	Autauga, Chilton, Dallas, Lowndes	2 hr
May 20, 6:14 PM CDT	Special Weather Statement	BMX	Barbour, Bullock, Montgomery	31 min
May 20, 6:40 PM CDT	Special Weather Statement	BMX	Elmore, Macon	35 min
May 20, 6:55 PM CDT	Special Weather Statement	BMX	DeKalb	35 min

Nearby

Special Weather Statements in Alabama, 2017 Every special weather statement in 2017

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.