Alert archive / Florida / Special Marine Warnings in 2009

Special Marine Warning 310, NWS Key West, FL

August 18, 2009

NWS Key West, FL issued this special marine warning at Aug 18, 2009, 3:12 PM EDT. It was in force for 93 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: Aug 18, 2009, 3:12 PM EDT (19:12 UTC)
Expired: Aug 18, 2009, 4:45 PM EDT
In force: 93 min
Issued by: NWS Key West, FL
Area: Storm-based polygon

The radar

The Miami radar (KAMX), 79 km from the middle of the area, began a volume at 19:15 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 (KEYW), launched 12:00Z, 7.2 hours before the alert went out and 99 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: 3126 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 9 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.

000 
WHUS52 KKEY 181912
SMWKEY
GMZ031>033-052>054-072-073-075-182045-
/O.NEW.KKEY.MA.W.0310.090818T1912Z-090818T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
312 PM EDT TUE AUG 18 2009

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  WATERS FROM KEY WEST TO 20 NM WEST OF DRY TORTUGAS OUT NORTH 20 NM
  AND SOUTH 60 NM...
  WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE OUT 20
  TO 60 NM...
  WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 TO 60 NM...
  COASTAL WATERS FROM THE WEST END OF THE 7 MILE BRIDGE TO KEY WEST
  OUT 20 NM...
  COASTAL WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE
  OUT 20 NM...
  COASTAL WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 NM...
  WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE OUT 20 TO 60 NM...
  GULF SIDE OF THE LOWER KEYS OUT 20 NM...
  FLORIDA BAY...

* UNTIL 445 PM EDT

* AT 308 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS...PRODUCING STRONG WINDS OVER 35 KNOTS FROM
  MOLASSES REEF LIGHT TO SOMBRERO KEY LIGHT...MOVING WEST AT 25      
  KNOTS. THIS INCLUDES THE FLORIDA BAY...WATERS OUT 20 NAUTICAL      
  MILES SOUTH OF THE KEYS ISLAND CHAIN...GULF WATERS NORTH OF THE    
  LOWER KEYS...AND WATERS OFF MAINLAND MONROE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS...CONFUSED SEAS...OCCASIONAL 
LIGHTNING...AND HEAVY RAINS. BOATERS SHOULD AVOID THIS AREA
UNTIL THIS STORM PASSES.

&&

LAT...LON 2431 8157 2532 8226 2534 8148 2522 8150
      2511 8145 2514 8100 2519 8086 2517 8071
      2525 8058 2525 8043 2519 8037 2534 8025
      2515 7998 2459 7953
TIME...MOT...LOC 1909Z 112DEG 26KT 2497 8037 2491 8067
          2472 8086 2457 8104

$$

WAH

2 follow-up statements

000 
FZUS72 KKEY 181952
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
352 PM EDT TUE AUG 18 2009

GMZ031>033-052>054-072-073-075-182045-
/O.CON.KKEY.MA.W.0310.000000T0000Z-090818T2045Z/
352 PM EDT TUE AUG 18 2009

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 445 PM EDT...

FOR THE FOLLOWING AREAS...
WATERS FROM KEY WEST TO 20 NM WEST OF DRY TORTUGAS OUT NORTH 20 NM
AND SOUTH 60 NM...
WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE OUT 20 TO
60 NM...
WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 TO 60 NM...
COASTAL WATERS FROM THE WEST END OF THE 7 MILE BRIDGE TO KEY WEST OUT
20 NM...
COASTAL WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE
OUT 20 NM...
COASTAL WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 NM...
WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE OUT 20 TO 60 NM...
GULF SIDE OF THE LOWER KEYS OUT 20 NM...
FLORIDA BAY...

AT 352 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF THUNDERSTORMS...PRODUCING STRONG WINDS OVER 35 
KNOTS FROM FLORIDA BAY TO COUPON BIGHT...MOVING WEST AT 25 KNOTS. 
THIS INCLUDES THE FLORIDA BAY...WATERS OUT 20 NAUTICAL MILES SOUTH 
OF THE KEYS ISLAND CHAIN...GULF WATERS NORTH OF THE LOWER KEYS...AND 
WATERS OFF MAINLAND MONROE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS...CONFUSED SEAS...OCCASIONAL 
LIGHTNING STRIKES AND HEAVY RAINS. BOATERS SHOULD AVOID THIS AREA 
UNTIL THIS STORM PASSES.

&&

LAT...LON 2485 7975 2469 8055 2441 8086 2431 8157
      2532 8226 2534 8148 2522 8150 2511 8145
      2514 8100 2519 8086 2517 8071 2525 8058
      2525 8043 2519 8037 2534 8025 2515 7998
TIME...MOT...LOC 1949Z 112DEG 26KT 2508 8066 2502 8096
          2483 8115 2468 8133

$$

WAH

000 
FZUS72 KKEY 182050
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
450 PM EDT TUE AUG 18 2009

GMZ031>033-052>054-072-073-075-182057-
/O.EXP.KKEY.MA.W.0310.000000T0000Z-090818T2045Z/
450 PM EDT TUE AUG 18 2009

...SPECIAL MARINE WARNING HAS EXPIRED...

THE AFFECTED AREAS WERE...
WATERS FROM KEY WEST TO 20 NM WEST OF DRY TORTUGAS OUT NORTH 20 NM
AND SOUTH 60 NM...
WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE OUT 20 TO
60 NM...
WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 TO 60 NM...
COASTAL WATERS FROM THE WEST END OF THE 7 MILE BRIDGE TO KEY WEST OUT
20 NM...
COASTAL WATERS FROM CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE
OUT 20 NM...
COASTAL WATERS FROM OCEAN REEF TO CRAIG KEY FL OUT 20 NM...
WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE OUT 20 TO 60 NM...
GULF SIDE OF THE LOWER KEYS OUT 20 NM...
FLORIDA BAY...

THE THUNDERSTORMS EARLIER PRODUCING STRONG WINDS ACROSS MUCH OF THE 
SERVICE AREA HAVE WEAKENED...AND WIND GUSTS IN EXCESS OF 35 KNOTS 
ARE NO LONGER EXPECTED AT THE PRESENT TIME. THEREFORE...THE SPECIAL 
MARINE WARNING IN EFFECT HAS BEEN ALLOWED TO EXPIRE. HOWEVER...THERE 
IS THE DISTINCT POSSIBILITY THAT ADDITIONAL STRONG SHOWERS AND 
THUNDERSTORMS WILL DEVELOP LATER THIS AFTERNOON AND THIS EVENING 
RESULTING IN ADDITIONAL WIND GUSTS EXCEEDING 35 KNOTS. PLEASE STAY 
TUNED TO NOAA WEATHER RADIO FOR ADDITIONAL WEATHER 
INFORMATION...POSSIBLE MARINE STATEMENTS...AND ADDITIONAL WARNINGS.

LAT...LON 2485 7975 2469 8055 2441 8086 2431 8157
      2532 8226 2534 8148 2522 8150 2511 8145
      2514 8100 2519 8086 2517 8071 2525 8058
      2525 8043 2519 8037 2534 8025 2515 7998
TIME...MOT...LOC 1952Z 112DEG 26KT 2509 8068 2503 8098
          2484 8117 2469 8135

$$

WAH/FUTTERMAN

The office that day

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

Issued	Product	Office	Lasted
Aug 18, 11:29 AM EDT	Special Marine Warning	KEY	46 min
Aug 18, 12:12 PM EDT	Special Marine Warning	KEY	63 min
Aug 18, 12:19 PM EDT	Special Marine Warning	KEY	56 min
Aug 18, 1:08 PM EDT	Small Craft Advisory	KEY	8 hr
Aug 18, 1:15 PM EDT	Special Marine Warning	KEY	2 hr
Aug 18, 2:18 PM EDT	Special Marine Warning	KEY	57 min

Nearby

Special Marine Warnings in Florida, 2009 Every special marine warning in 2009

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.