Alert archive / Alabama / Special Weather Statements in 2018

Special Weather Statement, NWS Mobile, AL

February 7, 2018Choctaw County, Alabama

NWS Mobile, AL issued this special weather statement at Feb 7, 2018, 6:43 AM CST for Choctaw County, Alabama. It was in force for 47 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: Feb 7, 2018, 6:43 AM CST (12:43 UTC)
Expired: Feb 7, 2018, 7:30 AM CST
In force: 47 min
Issued by: NWS Mobile, AL

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 165 km from the middle of the area, began a volume at 12:46 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

Birmingham, AL (KBMX), launched 12:00Z, 0.7 hours before the alert went out and 167 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: 743 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 422 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 517 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 10.6

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this special weather statement went out at Feb 7, 4:50 AM CST, 1 hour 53 minutes earlier.

Area forecast discussion, Feb 7, 4:50 AM CST, 1 hour 53 minutes before

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Hazardous weather outlook, Feb 6, 4:51 PM CST, 13 hours 52 minutes before

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In the hours before

Special weather statement, Feb 7, 6:43 AM CST, 0 minutes before

Special Weather Statement
National Weather Service Mobile AL
643 AM CST WED FEB 7 2018

ALZ051-071330-
Choctaw AL-
643 AM CST WED FEB 7 2018

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...
NORTHERN CHOCTAW COUNTY UNTIL 730 AM CST...

At 642 AM CST, the strong thunderstorm was located 5 miles west of
Lisman, or 9 miles northwest of Butler, moving east at 50 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Butler, Lisman and Pennington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3225 8801 3217 8801 3215 8802 3214 8804
      3211 8805 3209 8804 3206 8807 3207 8808
      3207 8810 3205 8812 3206 8845 3224 8843
      3228 8802 3226 8801 3229 8793
TIME...MOT...LOC 1242Z 267DEG 43KT 3216 8837

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 7, 3:25 AM CST	Marine Dense Fog Advisory	MOB		7 hr
Feb 7, 7:25 AM CST	Special Weather Statement	MOB	Choctaw	50 min
Feb 7, 7:47 AM CST	Special Weather Statement	MOB	Wilcox	43 min
Feb 7, 8:34 AM CST	River Flood Warning	MOB	Choctaw, Clarke, Washington	13 days
Feb 7, 8:34 AM CST	River Flood Warning	MOB	Choctaw, Clarke, Washington	13 days
Feb 7, 9:48 AM CST	Special Weather Statement	MOB	Escambia	57 min
Feb 7, 10:25 AM CST	Severe Thunderstorm Warning	MOB	Baldwin	50 min
Feb 7, 10:34 AM CST	Severe Thunderstorm Warning	MOB	Covington	33 min
Feb 7, 11:26 AM CST	Special Marine Warning	MOB		64 min
Feb 7, 11:42 AM CST	Special Marine Warning	MOB		93 min
Feb 7, 1:06 PM CST	Special Marine Warning	MOB		84 min
Feb 7, 2:25 PM CST	Special Marine Warning	MOB		95 min
Feb 7, 3:24 PM CST	Small Craft Advisory	MOB		24 hr
Feb 7, 11:10 AM CST	Special Weather Statement	MOB	Escambia, Okaloosa, Santa Rosa	80 min
Feb 7, 12:09 PM CST	Special Weather Statement	MOB	Okaloosa	66 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.