Alert archive / Florida / Special Marine Warnings in 2016

Special Marine Warning 310, NWS Miami, FL

August 14, 2016

NWS Miami, FL issued this special marine warning at Aug 14, 2016, 3:45 PM EDT. It was in force for 45 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 14, 2016, 3:45 PM EDT (19:45 UTC)
Expired
Aug 14, 2016, 4:30 PM EDT
In force
45 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

The radar

The Miami radar (KAMX), 173 km from the middle of the area, began a volume at 19:46 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

Tampa Bay, FL (KTBW), launched 12:00Z, 7.8 hours before the alert went out and 173 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, Tampa Bay, FL at 12:00Z on 2016-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 534 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2016-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 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
534 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1417 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
-67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

761 
WHUS52 KMFL 141945
SMWMFL
GMZ656-142030-
/O.NEW.KMFL.MA.W.0310.160814T1945Z-160814T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
345 PM EDT SUN AUG 14 2016

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH FL OUT 20 NM...

* UNTIL 430 PM EDT

* AT 345 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
  WATERSPOUTS WAS LOCATED NEAR NAPLES...MOVING WEST AT 25 KNOTS.

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

  SOURCE...RADAR INDICATED. 

  IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY 
           HAZARDOUS SEAS. SMALL CRAFT COULD BE DAMAGED IN BRIEFLY 
           HIGHER WINDS AND SUDDENLY HIGHER WAVES. 

* LOCATIONS IMPACTED INCLUDE...
  VANDERBILT BEACH...NAPLES AND BONITA SHORES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THUNDERSTORMS CAN PRODUCE SUDDEN WATERSPOUTS. WATERSPOUTS CAN EASILY
OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SEEK SAFE HARBOR
IMMEDIATELY.

&&

LAT...LON 2621 8220 2633 8186 2633 8182 2632 8182
      2631 8179 2620 8175 2603 8182 2609 8214
      2610 8215 2610 8219 2612 8222 2613 8223
TIME...MOT...LOC 1945Z 109DEG 26KT 2614 8187 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...>34KTS

$$

RAG
1 follow-up statement
771 
FZUS72 KMFL 142021
MWSMFL

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
421 PM EDT SUN AUG 14 2016

GMZ656-142030-
/O.EXP.KMFL.MA.W.0310.000000T0000Z-160814T2030Z/
421 PM EDT SUN AUG 14 2016

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 430 PM EDT...

THE AFFECTED AREAS WERE... 
COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH FL OUT 20 NM...

THE THUNDERSTORM HAS WEAKENED AND NO LONGER POSES A SIGNIFICANT
THREAT TO BOATERS. BOATERS SHOULD STILL EXPECT GUSTY WINDS AND
LIGHTNING ALONG THE COLLIER COUNTY COAST OVER THE NEXT HOUR OR SO.

LAT...LON 2621 8220 2633 8186 2633 8182 2632 8182
      2631 8179 2620 8175 2603 8182 2609 8214
      2610 8215 2610 8219 2612 8222 2613 8223
TIME...MOT...LOC 2019Z 109DEG 26KT 2614 8187 

$$

RAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 8:00 PM EDTSpecial Weather StatementMFLMiami-Dade45 min
Aug 13, 8:13 PM EDTSpecial Weather StatementMFLMiami-Dade77 min
Aug 13, 9:19 PM EDTSpecial Weather StatementMFLMiami-Dade41 min
Aug 13, 11:32 PM EDTSpecial Marine WarningMFL58 min
Aug 14, 3:46 AM EDTRip Current StatementMFLBroward, Miami-Dade20 hr
Aug 14, 5:52 AM EDTSpecial Marine WarningMFL38 min
Aug 14, 6:31 AM EDTSpecial Marine WarningMFL44 min

Nearby

Special Marine Warnings in Florida, 2016Every 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.