Alert archive / Alabama / Special Weather Statements in 2015

Special Weather Statement, NWS Birmingham, AL

June 20, 2015Shelby County, Alabama

NWS Birmingham, AL issued this special weather statement at Jun 20, 2015, 4:39 PM CDT for Shelby County, Alabama. It was in force for 66 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: Jun 20, 2015, 4:39 PM CDT (21:39 UTC)
Expired: Jun 20, 2015, 5:45 PM CDT
In force: 66 min
Issued by: NWS Birmingham, AL

County Shelby County, AL

The radar

The Birmingham radar (KBMX), 21 km from the middle of the area, began a volume at 21:39 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.7 hours before the alert went out and 233 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: 987 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Jun 19, 7:03 PM CDT	Special Weather Statement	BMX	Fayette	27 min
Jun 19, 7:13 PM CDT	Special Weather Statement	BMX	Winston	62 min
Jun 20, 3:23 PM CDT	Special Weather Statement	BMX	Shelby	52 min
Jun 20, 4:08 PM CDT	Special Weather Statement	BMX	Tuscaloosa	52 min
Jun 20, 4:35 PM CDT	Special Weather Statement	BMX	Dallas, Perry	55 min
Jun 20, 5:51 PM CDT	Special Weather Statement	BMX	Chilton	39 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.