Alert archive / Alabama / Special Weather Statements in 2018

Special Weather Statement, NWS Tallahassee, FL

March 18, 2018Geneva County, Alabama

NWS Tallahassee, FL issued this special weather statement at Mar 18, 2018, 3:21 PM CDT for Geneva County, Alabama. It was in force for 39 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
Mar 18, 2018, 3:21 PM CDT (20:21 UTC)
Expired
Mar 18, 2018, 4:00 PM CDT
In force
39 min
Issued by
NWS Tallahassee, FL

County Geneva County, AL

The radar

The Ft Rucker radar (KEOX), 47 km from the middle of the area, began a volume at 20:21 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 12:00Z, 8.4 hours before the alert went out and 166 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 12:00Z on 2018-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 79 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 12:00Z on 2018-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939587897Sfc1 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
79 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

187 
WWUS82 KTAE 182021
SPSTAE

Special Weather Statement
National Weather Service Tallahassee FL
321 PM CDT SUN MAR 18 2018
 
ALZ066-068-069-182100-
Dale AL-Houston AL-Geneva AL-
321 PM CDT SUN MAR 18 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DALE...CENTRAL
GENEVA AND WEST CENTRAL HOUSTON COUNTIES UNTIL 400 PM CDT...

At 321 PM CDT, National Weather Service doppler radar indicated a
strong thunderstorm near Geneva, moving northeast at 30 mph.

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

Locations impacted include...
Daleville, Geneva, Hartford, Slocomb, Malvern, Clayhatchee, Kellys
Crossroads, Eunola, Lytle, High Bluff, Highfalls, Dundee, Bald Hill,
Geneva Municipal A/P, Power Dam Road, Hendrix Crossroad, Bailey
Crossroad, Wicksburg and Somerset.

LAT...LON 3109 8597 3120 8582 3120 8579 3122 8579
      3130 8567 3113 8549 3100 8587
TIME...MOT...LOC 2021Z 240DEG 49KT 3108 8584 

$$

04-MCDERMOTT

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 18, 4:59 PM CDTSpecial Weather StatementTAEGadsden31 min
Mar 18, 5:13 PM CDTSpecial Weather StatementTAELeon32 min
Mar 17, 7:13 PM CDTSpecial Weather StatementTAEWorth32 min
Mar 17, 7:39 PM CDTSpecial Weather StatementTAETurner36 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.