Alert archive / Alabama / Special Weather Statements in 2018

Special Weather Statement, NWS Birmingham, AL

July 13, 2018Jefferson County, Alabama

NWS Birmingham, AL issued this special weather statement at Jul 13, 2018, 4:13 PM CDT for Jefferson County, Alabama. It was in force for 32 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: Jul 13, 2018, 4:13 PM CDT (21:13 UTC)
Expired: Jul 13, 2018, 4:45 PM CDT
In force: 32 min
Issued by: NWS Birmingham, AL

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 37 km from the middle of the area, began a volume at 21:16 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, 9.2 hours before the alert went out and 299 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: 1865 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 14 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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The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 3:56 AM CDT	Heat Advisory	BMX	Autauga, Barbour, Bibb, Bullock, Chilton, Coosa and 23 more	15 hr
Jul 13, 2:03 PM CDT	Special Weather Statement	BMX	Tallapoosa	27 min
Jul 13, 2:38 PM CDT	Special Weather Statement	BMX	Hale	37 min
Jul 13, 3:11 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	2 hr
Jul 13, 3:20 PM CDT	Special Weather Statement	BMX	Etowah	40 min
Jul 13, 3:53 PM CDT	Special Weather Statement	BMX	Chilton	37 min
Jul 13, 4:12 PM CDT	Special Weather Statement	BMX	Macon	33 min
Jul 13, 4:27 PM CDT	Areal Flood Advisory	BMX	Autauga, Elmore, Lowndes, Macon, Montgomery	2 hr
Jul 13, 5:14 PM CDT	Special Weather Statement	BMX	Autauga	31 min
Jul 13, 5:50 PM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Perry	115 min
Jul 13, 6:54 PM CDT	Special Weather Statement	BMX	Fayette	36 min

Nearby

Special Weather Statements in Alabama, 2018 Every special weather statement in 2018

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.