Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Birmingham, AL

August 15, 2017Coosa County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 15, 2017, 4:52 PM CDT for Coosa County, Alabama. It was in force for 23 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: Aug 15, 2017, 4:52 PM CDT (21:52 UTC)
Expired: Aug 15, 2017, 5:15 PM CDT
In force: 23 min
Issued by: NWS Birmingham, AL

County Coosa County, AL

The radar

The Birmingham radar (KBMX), 31 km from the middle of the area, began a volume at 21:52 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, 9.9 hours before the alert went out and 32 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: 907 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Aug 15, 3:56 PM CDT, 56 minutes earlier.

Area forecast discussion, Aug 15, 3:56 PM CDT, 56 minutes before

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Hazardous weather outlook, Aug 15, 4:06 AM CDT, 12 hours 46 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
406 AM CDT Tue Aug 15 2017

ALZ011>015-017>050-161215-
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-
406 AM CDT Tue Aug 15 2017

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

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

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

Hot and humid conditions are expected Wednesday and Thursday. Heat
index values may reach 105 degrees on both of those days, especially
across western and southern portions of Central Alabama.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management is not expected
at this time.

In the hours before

Special weather statement, Aug 15, 3:15 PM CDT, 1 hour 37 minutes before

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Special weather statement, Aug 15, 3:54 PM CDT, 58 minutes before

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Special weather statement, Aug 15, 4:08 PM CDT, 44 minutes before

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Special weather statement, Aug 15, 4:26 PM CDT, 26 minutes before

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Special weather statement, Aug 15, 4:34 PM CDT, 18 minutes before

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Special weather statement, Aug 15, 4:52 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 15, 2:16 PM CDT	Special Weather Statement	BMX	Tuscaloosa	29 min
Aug 15, 3:02 PM CDT	Special Weather Statement	BMX	Jefferson	28 min
Aug 15, 3:15 PM CDT	Special Weather Statement	BMX	Dallas	30 min
Aug 15, 3:54 PM CDT	Special Weather Statement	BMX	Shelby	36 min
Aug 15, 4:08 PM CDT	Special Weather Statement	BMX	Cullman	22 min
Aug 15, 4:26 PM CDT	Special Weather Statement	BMX	Barbour	34 min
Aug 15, 4:34 PM CDT	Special Weather Statement	BMX	Chilton	26 min
Aug 15, 5:09 PM CDT	Special Weather Statement	BMX	Russell	36 min
Aug 15, 5:16 PM CDT	Special Weather Statement	BMX	Coosa, Elmore	44 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.