Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Mobile, AL

September 23, 2017Washington County, Alabama

NWS Mobile, AL issued this special weather statement at Sep 23, 2017, 4:28 PM CDT for Washington 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: Sep 23, 2017, 4:28 PM CDT (21:28 UTC)
Expired: Sep 23, 2017, 5:00 PM CDT
In force: 32 min
Issued by: NWS Mobile, AL

County Washington County, AL

The radar

The Mobile radar (KMOB), 101 km from the middle of the area, began a volume at 21:28 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, 9.5 hours before the alert went out and 200 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: 499 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1228 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 5 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 Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 23, 3:30 PM CDT	Special Weather Statement	MOB	Clarke	30 min
Sep 23, 3:58 PM CDT	Special Weather Statement	MOB	Washington	32 min
Sep 23, 4:10 PM CDT	Special Weather Statement	MOB	Mobile	35 min
Sep 23, 4:43 PM CDT	Special Weather Statement	MOB	Mobile	32 min
Sep 23, 4:45 PM CDT	Special Weather Statement	MOB	Clarke	45 min
Sep 23, 5:34 PM CDT	Special Marine Warning	MOB		26 min
Sep 23, 5:53 PM CDT	Special Weather Statement	MOB	Covington	37 min
Sep 23, 6:05 PM CDT	Special Weather Statement	MOB	Marengo	25 min
Sep 23, 6:31 PM CDT	Special Weather Statement	MOB	Choctaw	44 min
Sep 22, 8:16 PM CDT	Special Weather Statement	MOB	Wayne	44 min
Sep 23, 5:43 PM CDT	Special Weather Statement	MOB	Perry	32 min
Sep 23, 6:29 PM CDT	Special Weather Statement	MOB	Stone	16 min
Sep 23, 6:56 PM CDT	Special Weather Statement	MOB	Stone	49 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.