Alert archive / Alabama / Special Weather Statements in 2015

Special Weather Statement, NWS Birmingham, AL

August 19, 2015Winston County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 19, 2015, 4:45 PM CDT for Winston County, Alabama. It was in force for 30 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 19, 2015, 4:45 PM CDT (21:45 UTC)
Expired: Aug 19, 2015, 5:15 PM CDT
In force: 30 min
Issued by: NWS Birmingham, AL

County Winston County, AL

The radar

The Columbus AFB radar (KGWX), 99 km from the middle of the area, began a volume at 21:44 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

Nashville Metro, TN (KBNA), launched 12:00Z, 9.8 hours before the alert went out and 221 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: 513 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 18, 7:12 PM CDT	Special Weather Statement	BMX	Perry	48 min
Aug 18, 7:32 PM CDT	Areal Flood Advisory	BMX	Dallas, Lowndes	118 min
Aug 18, 10:01 PM CDT	Areal Flood Advisory	BMX	Montgomery	119 min
Aug 19, 2:48 PM CDT	Special Weather Statement	BMX	Bullock, Montgomery	42 min
Aug 19, 5:20 PM CDT	Special Weather Statement	BMX	Chilton	25 min

Nearby

Special Weather Statements in Alabama, 2015 Every special weather statement in 2015

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.