Alert archive / Alabama / Special Marine Warnings in 2021

Special Marine Warning 21, NWS Mobile, AL

February 9, 2021

NWS Mobile, AL issued this special marine warning at Feb 9, 2021, 6:58 AM CST. 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 9, 2021, 6:58 AM CST (12:58 UTC)
Expired: Feb 9, 2021, 7:45 AM CST
In force: 47 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Eglin Afb radar (KEVX), 139 km from the middle of the area, began a volume at 13:01 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, 1.0 hours before the alert went out and 260 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: 59 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 488 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

As transmitted.

358 
WHUS54 KMOB 091258
SMWMOB
GMZ675-091345-
/O.NEW.KMOB.MA.W.0021.210209T1258Z-210209T1345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mobile AL
658 AM CST Tue Feb 9 2021

The National Weather Service in Mobile has issued a

* Special Marine Warning for...
  Waters from Okaloosa-Walton County Line to Pensacola FL from 20 to
  60 NM...

* Until 745 AM CST.

* At 658 AM CST, a strong thunderstorm was located 21 nm south of
  Oriskany Reef, or 40 nm south of Pensacola Pass, moving east at 25
  knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and 
           suddenly higher waves.

* The strong thunderstorm will remain over mainly open waters.

LAT...LON 2957 8714 2973 8715 2974 8640 2944 8640
TIME...MOT...LOC 1258Z 289DEG 26KT 2969 8704 

HAIL...0.00IN
WIND...>34KTS

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 8, 10:16 PM CST	Special Weather Statement	MOB	Mobile	59 min
Feb 8, 10:56 PM CST	Special Weather Statement	MOB	Baldwin	49 min
Feb 8, 11:18 PM CST	Special Weather Statement	MOB	Baldwin	42 min
Feb 9, 1:10 AM CST	Special Weather Statement	MOB	Covington	35 min
Feb 9, 3:12 AM CST	Special Weather Statement	MOB	Escambia	33 min
Feb 9, 4:50 AM CST	Special Marine Warning	MOB		55 min
Feb 9, 6:09 AM CST	Special Marine Warning	MOB		96 min
Feb 9, 7:45 AM CST	Special Marine Warning	MOB		60 min
Feb 9, 8:45 AM CST	Special Marine Warning	MOB		60 min
Feb 9, 12:28 AM CST	Special Weather Statement	MOB	Okaloosa	32 min

Nearby

Special Marine Warnings in Alabama, 2021 Every special marine warning in 2021

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.