Alert archive / Alabama / Special Marine Warnings in 2016

Special Marine Warning 310, NWS Mobile, AL

December 6, 2016

NWS Mobile, AL issued this special marine warning at Dec 6, 2016, 1:33 AM CST. It was in force for 57 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: Dec 6, 2016, 1:33 AM CST (07:33 UTC)
Expired: Dec 6, 2016, 2:30 AM CST
In force: 57 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), 96 km from the middle of the area, began a volume at 07:32 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, 7.6 hours before the alert went out and 234 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: 729 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 497 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.0

Open this sounding in Storm Lab

The text

As transmitted.

317 
WHUS54 KMOB 060733
SMWMOB
GMZ655-670-675-060830-
/O.NEW.KMOB.MA.W.0310.161206T0733Z-161206T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOBILE AL
133 AM CST TUE DEC 6 2016

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 230 AM CST

* AT 132 AM CST...SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  WATERSPOUTS WERE LOCATED ALONG A LINE EXTENDING FROM EAST PASS AT
  DESTIN TO 9 NM SOUTHWEST OF OKALOOSA DEEP WATER REEF TO 53 NM SOUTH
  OF ORISKANY REEF...MOVING EAST AT 30 KNOTS.

  HAZARD...WATERSPOUTS AND WIND GUSTS 34 KNOTS OR GREATER. 

  SOURCE...RADAR INDICATED. 

  IMPACT...WATERSPOUTS CAN QUICKLY FORM AND CAPSIZE BOATS...DAMAGE 
           VESSELS AND OIL RIGS.  MAKE SURE ALL ON BOARD ARE IN A 
           SECURE LOCATION. EXPECT WIND GUSTS IN EXCESS OF 34 
           KNOTS...SUDDENLY HIGHER WAVES...FREQUENT LIGHTNING...AND 
           HEAVY DOWNPOURS.  MAKE SURE ALL ON BOARD ARE WEARING LIFE 
           JACKETS. 

* LOCATIONS IMPACTED INCLUDE...
  EAST PASS AT DESTIN...OKALOOSA DEEP WATER REEF...FORT WALTON
  LIBERTY SHIP REEF...OKALOOSA PIER AND DESTIN.

LAT...LON 2932 8717 2998 8698 3040 8666 3040 8663
      3041 8665 3041 8652 3040 8639 3038 8640
      3038 8650 2937 8652 2939 8668
TIME...MOT...LOC 0732Z 250DEG 28KT 3040 8652 2988 8667 2915 8715 

WATERSPOUT...POSSIBLE
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
Dec 5, 10:51 PM CST	Special Marine Warning	MOB		84 min
Dec 5, 11:59 PM CST	Special Marine Warning	MOB		91 min
Dec 6, 1:28 AM CST	Special Marine Warning	MOB		32 min
Dec 6, 2:02 AM CST	Special Marine Warning	MOB		28 min
Dec 6, 1:24 AM CST	Special Weather Statement	MOB	Okaloosa	51 min

Nearby

Special Marine Warnings in Alabama, 2016 Every special marine warning in 2016

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.