Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Birmingham, AL

August 19, 2017Sumter County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 19, 2017, 5:47 PM CDT for Sumter County, Alabama. It was in force for 43 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, 2017, 5:47 PM CDT (22:47 UTC)
Expired: Aug 19, 2017, 6:30 PM CDT
In force: 43 min
Issued by: NWS Birmingham, AL

County Sumter County, AL

The radar

The Birmingham radar (KBMX), 119 km from the middle of the area, began a volume at 22:50 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

Jackson, MS (KJAN), launched 12:00Z, 10.8 hours before the alert went out and 212 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: 1850 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

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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 19, 4:20 PM CDT	Special Weather Statement	BMX	Hale	25 min
Aug 19, 5:04 PM CDT	Special Weather Statement	BMX	Hale	26 min
Aug 19, 5:35 PM CDT	Special Weather Statement	BMX	Marengo	40 min
Aug 19, 6:18 PM CDT	Areal Flood Advisory	BMX	Marengo, Perry	117 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.