Alert archive / Alabama / Special Marine Warnings in 2011

Special Marine Warning 21, NWS Mobile, AL

February 1, 2011

NWS Mobile, AL issued this special marine warning at Feb 1, 2011, 8:51 PM CST. It was in force for 54 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 1, 2011, 8:51 PM CST (02:51 UTC)
Expired: Feb 1, 2011, 9:45 PM CST
In force: 54 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

The radar

The Eglin Afb radar (KEVX), 51 km from the middle of the area, began a volume at 02:51 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, 2.9 hours before the alert went out and 201 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: 64 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 355 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

870 
WHUS54 KMOB 020251
SMWMOB
GMZ655-675-020345-
/O.NEW.KMOB.MA.W.0021.110202T0251Z-110202T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOBILE AL
851 PM CST TUE FEB 1 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  WATERS FROM DESTIN TO PENSACOLA FL FROM 20 TO 60 NM...
  COASTAL WATERS FROM DESTIN TO PENSACOLA FL OUT 20 NM...

* UNTIL 945 PM CST

* AT 847 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS...PRODUCING STRONG WINDS 40 KNOTS OR         
  GREATER   FROM WEST CHOCTAWHATCHEE BAY TO 11 NM SOUTH OF ORISKANY  
  REEF...MOVING NORTHEAST AT 50 KNOTS.

* THESE STRONG THUNDERSTORMS WILL BE NEAR
  OVER DESTIN BY 9 PM CST
  OVER EAST CHOCTAWHATCHEE BAY BY 930 PM CST
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS TO NEAR 40 KNOTS...HIGH 
WAVES...DANGEROUS LIGHTNING...AND HEAVY RAINS. BOATERS SHOULD SEEK 
OR REMAIN IN SAFE HARBOR UNTIL THESE STORM PASS.

&&

LAT...LON 3043 8624 3043 8625 3042 8622 3041 8649
      3040 8643 2982 8645 2960 8713 3018 8697
      3047 8658 3045 8655 3048 8648 3053 8649
      3052 8641 3049 8643 3046 8639 3050 8614
      3049 8613 3045 8615 3040 8610 3039 8610
TIME...MOT...LOC 0249Z 232DEG 68KT 3050 8649 2988 8695

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 1, 6:15 PM CST	Special Marine Warning	MOB		45 min
Feb 1, 6:38 PM CST	Severe Thunderstorm Warning	MOB	Covington, Escambia	52 min
Feb 1, 7:00 PM CST	Special Marine Warning	MOB		50 min
Feb 1, 7:48 PM CST	Special Marine Warning	MOB		57 min
Feb 2, 2:40 PM CST	Winter Weather Advisory	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	27 hr
Feb 1, 6:08 PM CST	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	52 min

Nearby

Special Marine Warnings in Alabama, 2011 Every special marine warning in 2011

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.