Alert archive / Florida / Special Marine Warnings in 2012

Special Marine Warning 252, NWS Key West, FL

July 16, 2012

NWS Key West, FL issued this special marine warning at Jul 16, 2012, 8:11 PM EDT. It was in force for 34 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: Jul 16, 2012, 8:11 PM EDT (00:11 UTC)
Expired: Jul 16, 2012, 8:45 PM EDT
In force: 34 min
Issued by: NWS Key West, FL
Area: Storm-based polygon

The radar

The Miami radar (KAMX), 85 km from the middle of the area, began a volume at 00:13 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

Key West, FL (KNQX), launched 00:00Z, 0.2 hours before the alert went out and 92 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: 2196 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 978 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 46 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.

354 
WHUS52 KKEY 170011
SMWKEY
GMZ031-032-170045-
/O.NEW.KKEY.MA.W.0252.120717T0011Z-120717T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
811 PM EDT MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* SPECIAL MARINE WARNING FOR...

  FLORIDA BAY INCLUDING BLACKWATER AND BUTTONWOOD SOUNDS...
  BAYSIDE AND GULFSIDE FROM CRAIG KEY TO HALFMOON SHOAL OUT TO 5
  FATHOMS...

* UNTIL 845 PM EDT

* AT 808 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
  THUNDERSTORM...PRODUCING STRONG WINDS OVER 35 KNOTS ABOUT 3 MILES  
  TO THE WEST OF OXFOOT BANK LIGHT.  THIS STRONG THUNDERSTORM WAS    
  DRIFTING TO THE SOUTHEAST.

* LOCATIONS IN THE WARNING INCLUDE...

  NORTHEASTERN BAYSIDE AND GULF SIDE FROM CRAIG KEY TO HALFMOON SHOAL
  OUT TO 5 FATHOMS 

BOATERS SHOULD SEEK SAFE HARBOR NOW...AND REMAIN THERE UNTIL
THREATENING WEATHER HAS PASSED.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE 
OPEN WATER...STAY LOW OR GO BELOW.

LAT...LON 2497 8080 2485 8112 2500 8122 2513 8105
      2513 8100 2514 8097 2515 8092
TIME...MOT...LOC 0010Z 263DEG 2KT 2497 8109

$$

FUTTERMAN

2 follow-up statements

372 
FZUS72 KKEY 170029
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
829 PM EDT MON JUL 16 2012

GMZ031-032-170045-
/O.CON.KKEY.MA.W.0252.000000T0000Z-120717T0045Z/
829 PM EDT MON JUL 16 2012

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 845 PM EDT...

FOR THE FOLLOWING AREAS...
FLORIDA BAY INCLUDING BLACKWATER AND BUTTONWOOD SOUNDS...
BAYSIDE AND GULF SIDE FROM CRAIG KEY TO HALFMOON SHOAL OUT TO 5
FATHOMS...

AT 815 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A STRONG CLUSTER OF THUNDERSTORMS PRODUCING STRONG WIND 
GUSTS AROUND 35 KNOTS...REMAINING NEAR OXFOOT BANK LIGHT...DRIFTING 
SOUTHEASTWARD.  

* LOCATIONS IN THE WARNING INCLUDE...

  NORTHEASTERN BAYSIDE AND GULF SIDE FROM CRAIG KEY TO HALFMOON SHOAL
  OUT TO 5 FATHOMS 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO WATER LIGHTNING STRIKES ARE OCCURRING WITH THIS 
STORM. IF CAUGHT ON THE OPEN WATER...STAY LOW OR GO BELOW.

&&

LAT...LON 2497 8080 2485 8112 2500 8122 2513 8105
      2513 8100 2514 8097 2515 8092
TIME...MOT...LOC 0028Z 263DEG 2KT 2497 8108

$$

FUTTERMAN

369 
FZUS72 KKEY 170050
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
850 PM EDT MON JUL 16 2012

GMZ031-032-170100-
/O.EXP.KKEY.MA.W.0252.000000T0000Z-120717T0045Z/
850 PM EDT MON JUL 16 2012

...SPECIAL MARINE WARNING HAS EXPIRED...

THE AFFECTED AREAS WERE...
FLORIDA BAY INCLUDING BLACKWATER AND BUTTONWOOD SOUNDS...
BAYSIDE AND GULF SIDE FROM CRAIG KEY TO HALFMOON SHOAL OUT TO 5
FATHOMS...

* LOCATIONS IN THE WARNING INCLUDE...

  NORTHEASTERN BAYSIDE AND GULF SIDE FROM CRAIG KEY TO HALFMOON SHOAL
  OUT TO 5 FATHOMS 

THE THUNDERSTORMS EARLIER PRODUCING STRONG WINDS HAVE WEAKENED...AND
WIND GUSTS IN EXCESS OF 35 KNOTS ARE NO LONGER EXPECTED. THEREFORE...
THE SPECIAL MARINE WARNING IN EFFECT HAS BEEN ALLOWED TO EXPIRE. 
STAY TUNED TO NOAA WEATHER RADIO FOR ADDITIONAL WEATHER INFORMATION.

LAT...LON 2497 8080 2485 8112 2500 8122 2513 8105
      2513 8100 2514 8097 2515 8092
TIME...MOT...LOC 0029Z 263DEG 2KT 2497 8108

$$

FUTTERMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 10:21 PM EDT	Areal Flood Advisory	KEY	Monroe	43 min
Jul 17, 4:50 AM EDT	Special Marine Warning	KEY		55 min
Jul 17, 8:08 AM EDT	Special Marine Warning	KEY		35 min
Jul 17, 8:37 AM EDT	Special Marine Warning	KEY		23 min
Jul 17, 2:43 PM EDT	Special Marine Warning	KEY		30 min
Jul 17, 3:06 PM EDT	Special Marine Warning	KEY		24 min
Jul 17, 4:02 PM EDT	Areal Flood Advisory	KEY	Monroe	118 min
Jul 17, 4:28 PM EDT	Special Marine Warning	KEY		62 min

Nearby

Special Marine Warnings in Florida, 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.