Alert archive / Alabama / Special Marine Warnings in 2012

Special Marine Warning 21, NWS Mobile, AL

March 9, 2012

NWS Mobile, AL issued this special marine warning at Mar 9, 2012, 7:40 AM CST. It was in force for 2 hr. 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 9, 2012, 7:40 AM CST (13:40 UTC)
Expired: Mar 9, 2012, 9:45 AM CST
In force: 2 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon

The radar

The Eglin Afb radar (KEVX), 75 km from the middle of the area, began a volume at 13:43 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, 1.7 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1300 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 122 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.

938 
WHUS54 KMOB 091340
SMWMOB
GMZ650-655-670-675-091545-
/O.NEW.KMOB.MA.W.0021.120309T1340Z-120309T1545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOBILE AL
740 AM CST FRI MAR 9 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  COASTAL WATERS FROM DESTIN FL TO WRN DAUPHIN ISLAND AL OUT 60 NM
  INCLUDING CHOCTAWHATCHEE BAY
  INCLUDING PENSACOLA BAY

* UNTIL 945 AM CST

* AT 734 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS...PRODUCING STRONG WINDS 34 KNOTS OR GREATER
  FROM 49 NM SOUTH OF PETIT BOIS PASS TO 26 NM NORTHEAST OF DESTIN...
  OR FROM 53 NM SOUTH OF MISSISSIPPI SOUND EAST OF PASCAGOULA TO 13
  NM NORTHEAST OF HIGHWAY 331 BRIDGE...MOVING SOUTHEAST AT 25 KNOTS.

* THESE STRONG THUNDERSTORMS WILL BE NEAR
  OVER EAST CHOCTAWHATCHEE BAY AROUND 745 AM CST
  OVER HIGHWAY 331 BRIDGE AROUND 750 AM CST
  OVER ORISKANY REEF AROUND 755 AM CST
  OVER OKALOOSA DEEP WATER REEF AROUND 835 AM CST

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS...HIGH WAVES...DANGEROUS LIGHTNING...
AND HEAVY RAINS. BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY...UNTIL
THIS STORM PASSES.

&&

LAT...LON 3037 8611 3043 8625 3040 8651 2937 8653
      2921 8797 2988 8831 3047 8696 3044 8687
      3037 8714 3041 8659 3043 8664 3051 8649
      3053 8650 3051 8641 3045 8642 3048 8614
      3049 8614 3041 8609
TIME...MOT...LOC 1339Z 327DEG 23KT 2943 8868 3057 8601

$$

1 follow-up statement

468 
FZUS74 KMOB 091504
MWSMOB

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
904 AM CST FRI MAR 9 2012

GMZ650-655-670-675-091545-
/O.CON.KMOB.MA.W.0021.000000T0000Z-120309T1545Z/
904 AM CST FRI MAR 9 2012

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 945 AM CST...

FOR THE FOLLOWING AREAS...
COASTAL WATERS FROM PENSACOLA FL TO PASCAGOULA MS...
DESTIN TO PENSACOLA FL OUT 20 NM...
WATERS FROM PENSACOLA FL TO PASCAGOULA MS FROM...
DESTIN TO PENSACOLA FL FROM 20 TO 60 NM...

AT 902 AM CST...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE 
A LINE OF THUNDERSTORMS...WITH A HISTORY OF PRODUCING WINDS OF 34 TO 
50 KNOTS...FROM 68 NM SOUTHWEST OF ORISKANY REEF TO 3 NM WEST OF 
OKALOOSA DEEP WATER REEF...OR FROM 44 NM SOUTH OF FAREWELL BUOY TO 26
NM SOUTH OF DESTIN...MOVING SOUTHEAST AT 25 KNOTS.

THESE STRONG THUNDERSTORMS WILL BE...
  WATERS FROM DESTIN TO PENSACOLA FL FROM 20 TO 60 NM AT 920 AM CST.
  WATERS FROM PENSACOLA FL TO PASCAGOULA MS FROM 20 TO 60 NM AT 920
  AM CST.


AT 8 AM CST...BUOY 42012...17 MILES SOUTHEAST OF GULF SHORES 
REPORTED A WIND GUST OF 45 KNOTS. 

IF CAUGHT ON THE OPEN WATERS...ENSURE LIFE JACKETS ARE SECURELY
FASTENED BY YOU AND YOUR CREW. SECURE ANY LOOSE CARGO...AND MAKE SURE
ALL SAFETY GEAR IS READILY AVAILABLE. MAKE SURE ALL OVERBOARD DRAINS
ARE FREE OF OBSTRUCTIONS. PREPARE FOR SUDDEN SQUALLS AND BREAKING
WAVES...AND TAKE EVASIVE ACTION TO PREVENT CAPSIZING.

LAT...LON 3037 8611 3043 8625 3040 8651 2937 8653
      2921 8797 2988 8831 3047 8696 3044 8687
      3037 8714 3041 8659 3043 8664 3051 8649
      3053 8650 3051 8641 3045 8642 3048 8614
      3049 8614 3041 8609
TIME...MOT...LOC 1502Z 324DEG 26KT 2937 8805 2995 8655

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 9, 5:06 AM CST	Special Marine Warning	MOB		39 min
Mar 9, 5:38 AM CST	Special Marine Warning	MOB		2 hr
Mar 9, 10:42 AM CST	Special Marine Warning	MOB		63 min
Mar 9, 10:49 AM CST	River Flood Warning	MOB	Choctaw, Clarke, Washington	9 hr
Mar 9, 10:49 AM CST	River Flood Warning	MOB	Choctaw, Clarke, Washington	9 hr

Nearby

Special Marine Warnings in Alabama, 2012 Every special marine warning in 2012

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.