Alert archive / Florida / Special Marine Warnings in 2011

Special Marine Warning 310, NWS Key West, FL

October 17, 2011

NWS Key West, FL issued this special marine warning at Oct 17, 2011, 6:29 PM EDT. It was in force for 46 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
Oct 17, 2011, 6:29 PM EDT (22:29 UTC)
Expired
Oct 17, 2011, 7:15 PM EDT
In force
46 min
Issued by
NWS Key West, FL
Area
Storm-based polygon

The radar

The Key West radar (KBYX), 107 km from the middle of the area, began a volume at 22:29 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, 10.5 hours before the alert went out and 108 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-pSkew-T log-p diagram, Key West, FL at 12:00Z on 2011-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 561 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Key West, FL at 12:00Z on 2011-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 184 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
561 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
483 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
184 m²/s²
0-3 km storm-relative helicity
361 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

Open this sounding in Storm Lab

The text

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

402 
WHUS52 KKEY 172229
SMWKEY
GMZ053-073-172315-
/O.NEW.KKEY.MA.W.0310.111017T2229Z-111017T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
629 PM EDT MON OCT 17 2011

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE
  OUT 20 NM...
  STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE
  20 TO 60 NM OUT...

* UNTIL 715 PM EDT

* AT 624 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A THUNDERSTORM... CAPABLE OF PRODUCING A WATERSPOUT 23 NAUTICAL    
  MILES SOUTH OF TENNESSEE REEF LIGHT...MOVING NORTHWEST AT 10       
  KNOTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WATERSPOUT IS A TORNADO OVER WATER THAT CAN BE DANGEROUS AND EVEN 
DEADLY. SMALL CRAFT CAN BE SWAMPED OR OVERTURNED BY A WATERSPOUT. 
STAY AWAY FROM THEM AT ALL TIMES.

&&

LAT...LON 2432 8074 2466 8082 2468 8065 2455 8055
      2444 8049 2430 8062
TIME...MOT...LOC 2228Z 136DEG 10KT 2440 8066

$$

MSB
2 follow-up statements
637 
FZUS72 KKEY 172250
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
650 PM EDT MON OCT 17 2011

GMZ053-073-172315-
/O.CON.KKEY.MA.W.0310.000000T0000Z-111017T2315Z/
650 PM EDT MON OCT 17 2011

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 715 PM EDT...

FOR THE FOLLOWING AREAS...
STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE
OUT 20 NM...
STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE 20
TO 60 NM OUT...

AT 647 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM CAPABLE OF PRODUCING A WATERSPOUT 19 
NAUTICAL MILES SOUTH OF TENNESSEE REEF LIGHT...MOVING NORTHWEST AT 
10 KNOTS.

A WATERSPOUT IS A TORNADO OVER WATER THAT CAN BE DANGEROUS AND EVEN 
DEADLY. SMALL CRAFT CAN BE SWAMPED OR OVERTURNED BY A WATERSPOUT. 
STAY AWAY FROM THEM AT ALL TIMES.

LAT...LON 2432 8074 2466 8082 2468 8065 2455 8055
      2444 8049 2430 8062
TIME...MOT...LOC 2250Z 136DEG 10KT 2444 8071

$$

MSB
480 
FZUS72 KKEY 172312
MWSKEY

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
712 PM EDT MON OCT 17 2011

GMZ053-073-172321-
/O.EXP.KKEY.MA.W.0310.000000T0000Z-111017T2315Z/
712 PM EDT MON OCT 17 2011

...SPECIAL MARINE WARNING WILL EXPIRE AT 715 PM EDT...

THE AFFECTED AREAS WERE...
STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE
OUT 20 NM...
STRAITS OF FLORIDA FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE 20
TO 60 NM OUT...

THE THUNDERSTORMS EARLIER PRODUCING STRONG WINDS HAVE WEAKENED...AND 
WATERSPOUTS ARE NO LONGER EXPECTED. THEREFORE...THE SPECIAL MARINE 
WARNING IN EFFECT FOR THE FLORIDA STRAITS PAST 10 NM SOUTH OF CRAIG 
KEY HAS BEEN ALLOWED TO EXPIRE. STAY TUNED TO NOAA WEATHER RADIO FOR 
ADDITIONAL WEATHER INFORMATION.

LAT...LON 2432 8074 2466 8082 2468 8065 2455 8055
      2444 8049 2430 8062
TIME...MOT...LOC 2311Z 136DEG 10KT 2448 8076

$$

MSB

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 16, 9:58 PM EDTTornado WarningKEYMonroe22 min
Oct 16, 10:12 PM EDTAreal Flood AdvisoryKEYMonroe2 hr
Oct 16, 10:52 PM EDTSpecial Marine WarningKEY23 min
Oct 17, 12:08 AM EDTSpecial Marine WarningKEY31 min
Oct 17, 12:25 AM EDTSpecial Marine WarningKEY50 min
Oct 17, 12:56 AM EDTSpecial Marine WarningKEY49 min
Oct 17, 3:58 AM EDTAreal Flood AdvisoryKEYMonroe107 min
Oct 17, 4:54 AM EDTSpecial Marine WarningKEY66 min
Oct 17, 5:10 AM EDTSpecial Marine WarningKEY50 min
Oct 17, 5:46 AM EDTAreal Flood AdvisoryKEYMonroe119 min
Oct 17, 5:58 AM EDTSpecial Marine WarningKEY62 min
Oct 17, 6:07 AM EDTSpecial Marine WarningKEY68 min
Oct 17, 6:26 AM EDTSpecial Marine WarningKEY64 min
Oct 17, 7:01 AM EDTSpecial Marine WarningKEY59 min
Oct 17, 7:23 AM EDTSpecial Marine WarningKEY67 min
Oct 17, 7:35 AM EDTSpecial Marine WarningKEY55 min
Oct 17, 7:40 AM EDTAreal Flood AdvisoryKEYMonroe9 hr
Oct 17, 8:31 AM EDTSpecial Marine WarningKEY59 min
Oct 17, 8:37 AM EDTSpecial Marine WarningKEY53 min
Oct 17, 8:42 AM EDTSpecial Marine WarningKEY63 min
Oct 17, 10:02 AM EDTSpecial Marine WarningKEY33 min
Oct 17, 10:59 AM EDTSpecial Marine WarningKEY61 min
Oct 17, 12:15 PM EDTSpecial Marine WarningKEY37 min
Oct 17, 1:14 PM EDTSpecial Marine WarningKEY31 min
Oct 17, 4:30 PM EDTAreal Flood AdvisoryKEYMonroe3 hr
Oct 17, 4:49 PM EDTSmall Craft AdvisoryKEY43 hr
Oct 17, 5:40 PM EDTSpecial Marine WarningKEY50 min

Nearby

Special Marine Warnings in Florida, 2011Every 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.