Alert archive / Alabama / Special Weather Statements in 2018

Special Weather Statement, NWS Mobile, AL

August 4, 2018Covington County, Alabama

NWS Mobile, AL issued this special weather statement at Aug 4, 2018, 7:07 PM CDT for Covington County, Alabama. It was in force for 38 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 4, 2018, 7:07 PM CDT (00:07 UTC)
Expired
Aug 4, 2018, 7:45 PM CDT
In force
38 min
Issued by
NWS Mobile, AL

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 76 km from the middle of the area, began a volume at 00:08 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 0.1 hours before the alert went out and 219 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2018-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1827 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2018-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1827 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
967 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

913 
WWUS84 KMOB 050007
SPSMOB

Special Weather Statement
National Weather Service Mobile AL
707 PM CDT SAT AUG 4 2018
 
ALZ060-FLZ205-050045-
Covington AL-Okaloosa Inland FL-
707 PM CDT SAT AUG 4 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING
COUNTIES...SOUTHERN COVINGTON AND NORTH CENTRAL OKALOOSA COUNTIES
UNTIL 745 PM CDT...

At 706 PM CDT, a developing cluster of strong thunderstorms were 
located along a line extending from 8 miles north of Lockhart to 6 
miles northwest of Laurel Hill, and moving northwest at 10 mph.

Winds gusts of 40 to 50 mph will be possible with these storms.

These storms will remain over mainly rural areas of southern
Covington and north central Okaloosa Counties.

LAT...LON 3111 8629 3106 8632 3101 8648 3094 8660
      3105 8667 3117 8654 3123 8637
TIME...MOT...LOC 0006Z 147DEG 8KT 3113 8633 3108 8647 3101 8656 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 4:01 PM CDTSpecial Marine WarningMOB64 min

Nearby

Special Weather Statements in Alabama, 2018Every 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.