Alert archive / Florida / Special Marine Warnings in 2012

Special Marine Warning 310, NWS Miami, FL

August 24, 2012

NWS Miami, FL issued this special marine warning at Aug 24, 2012, 3:47 PM EDT. It was in force for 58 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 24, 2012, 3:47 PM EDT (19:47 UTC)
Expired
Aug 24, 2012, 4:45 PM EDT
In force
58 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

The radar

The Miami radar (KAMX), 45 km from the middle of the area, began a volume at 19:49 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

Miami, FL (KMFL), launched 12:00Z, 7.8 hours before the alert went out and 44 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, Miami, FL at 12:00Z on 2012-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2430 joules per kilogram.LCLLFCEL10008507005003002001001 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, Miami, FL at 12:00Z on 2012-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939Sfc1 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
2430 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
13 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.

969 
WHUS52 KMFL 241947
SMWMFL
AMZ630-651-671-242045-
/O.NEW.KMFL.MA.W.0310.120824T1947Z-120824T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
347 PM EDT FRI AUG 24 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  WATERS FROM DEERFIELD BEACH TO OCEAN REEF FL FROM 20 TO 60 NM
  EXCLUDING THE TERRITORIAL WATERS OF BAHAMAS
  COASTAL WATERS FROM DEERFIELD BEACH TO OCEAN REEF FL OUT 20 NM
  BISCAYNE BAY

* UNTIL 445 PM EDT

* AT 340 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS...CAPABLE OF PRODUCING STRONG WINDS OF 34
  KNOTS OR GREATER FROM 45 NM EAST OF SEA RANCH LAKES TO 21 NM
  SOUTHEAST OF ELLIOTT KEY... FROM 45 NM EAST OF SEA RANCH LAKES TO
  11 NM SOUTHEAST OF CARYSFORT REEF LIGHT...MOVING WEST AT 15 KNOTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AS THUNDERSTORMS MOVE OVER THE WATER...MARINERS CAN EXPECT STRONG
GUSTY WINDS...HIGH SEAS...DANGEROUS LIGHTNING...AND HEAVY RAIN. MOVE
TO SAFE HARBOR OR STAY CLOSE TO SHORE UNTIL THE STORM PASSES. IF
CAUGHT ON THE OPEN WATER...MAKE SURE ALL SAFETY GEAR IS AVAILABLE AND
LIFE JACKETS ARE BEING WORN BY YOU AND YOUR CREW.

&&

LAT...LON 2577 7910 2552 7916 2520 7956 2505 7989
      2514 7997 2533 8026 2527 8034 2520 8035
      2520 8042 2531 8039 2537 8031 2551 8034
      2561 8031 2572 8026 2575 8020 2587 8018
      2592 8013 2623 8010 2613 7909
TIME...MOT...LOC 1944Z 100DEG 12KT 2605 7929 2578 7987
          2550 8011 2515 8004

$$

AK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 11:43 AM EDTSpecial Marine WarningMFL62 min
Aug 24, 12:31 PM EDTSpecial Weather StatementMFLPalm Beach29 min
Aug 24, 1:24 PM EDTSpecial Marine WarningMFL66 min
Aug 24, 2:09 PM EDTSmall Craft AdvisoryMFL9 hr
Aug 24, 3:57 PM EDTSpecial Marine WarningMFL63 min
Aug 24, 4:34 PM EDTSevere Thunderstorm WarningMFLMiami-Dade26 min
Aug 24, 4:45 PM EDTSpecial Marine WarningMFL2 hr
Aug 24, 5:06 PM EDTTropical Storm WatchMFLBroward, Collier, Glades, Hendry, Miami-Dade, Monroe and 1 more6 hr
Aug 24, 5:17 PM EDTSpecial Weather StatementMFLMiami-Dade43 min
Aug 24, 5:31 PM EDTRip Current StatementMFLBroward, Miami-Dade, Palm Beach50 hr
Aug 24, 5:52 PM EDTSpecial Weather StatementMFLBroward38 min
Aug 24, 6:40 PM EDTSpecial Marine WarningMFL2 hr
Aug 24, 7:40 PM EDTSpecial Weather StatementMFLPalm Beach50 min

Nearby

Special Marine Warnings in Florida, 2012Every 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.