Alert archive / Florida / Special Marine Warnings in 2021

Special Marine Warning 310, NWS Miami, FL

August 2, 2021

NWS Miami, FL issued this special marine warning at Aug 2, 2021, 4:01 PM EDT. It was in force for 59 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 2, 2021, 4:01 PM EDT (20:01 UTC)
Expired: Aug 2, 2021, 5:00 PM EDT
In force: 59 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Melbourne radar (KMLB), 127 km from the middle of the area, began a volume at 20:01 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.

What was reported inside it

Time	Report	Where	Remark
Aug 2, 4:30 PM EDT	MARINE TSTM WIND 45	11 Se Brighton Seminole, FL	LAKE OKEECHOBEE WEST MESONET REPORTED A GUST TO 39 KNOTS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.0 hours before the alert went out and 138 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: 1725 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

967 
WHUS52 KMFL 022001
SMWMFL
AMZ610-022100-
/O.NEW.KMFL.MA.W.0310.210802T2001Z-210802T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Miami FL
401 PM EDT Mon Aug 2 2021

The National Weather Service in Miami has issued a

* Special Marine Warning for...
  Lake Okeechobee...

* Until 500 PM EDT.

* At 401 PM EDT, a strong thunderstorm was located near Moore Haven,
  moving north at 15 knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and 
           suddenly higher waves.

* Locations impacted include...
  Canal Point, Liberty Point, Clewiston, Sand Cut, Pahokee, Buckhead
  Ridge, Lake Harbor, Calusa and Moore Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Report severe weather to the Coast Guard or the National Weather
Service. You can also share your report with NWS Miami on Facebook
and Twitter.

&&

LAT...LON 2718 8074 2711 8066 2696 8061 2696 8055
      2688 8055 2679 8063 2674 8063 2666 8068
      2663 8075 2666 8086 2680 8113 2687 8118
      2701 8115 2720 8093 2717 8090 2716 8088
      2714 8087 2720 8082 2721 8079
TIME...MOT...LOC 2001Z 193DEG 16KT 2689 8103 

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

$$

Weinman

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 2:32 AM EDT	Heat Advisory	MFL	Collier, Glades, Hendry	16 hr
Aug 2, 6:42 AM EDT	Special Marine Warning	MFL		48 min
Aug 2, 8:57 AM EDT	Special Marine Warning	MFL		24 min
Aug 2, 10:36 AM EDT	Special Weather Statement	MFL	Monroe	39 min
Aug 2, 12:18 PM EDT	Special Weather Statement	MFL	Broward	42 min
Aug 2, 1:39 PM EDT	Special Weather Statement	MFL	Miami-Dade	51 min
Aug 2, 2:28 PM EDT	Special Weather Statement	MFL	Broward	47 min
Aug 2, 2:39 PM EDT	Special Weather Statement	MFL	Broward	36 min
Aug 2, 3:04 PM EDT	Special Weather Statement	MFL	Broward	41 min
Aug 2, 3:08 PM EDT	Areal Flood Advisory	MFL	Broward, Miami-Dade, Palm Beach	2 hr
Aug 2, 3:14 PM EDT	Special Weather Statement	MFL	Broward	46 min
Aug 2, 3:17 PM EDT	Special Marine Warning	MFL		58 min
Aug 2, 3:26 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	37 min
Aug 2, 3:33 PM EDT	Areal Flood Advisory	MFL	Broward, Palm Beach	117 min
Aug 2, 3:43 PM EDT	Special Weather Statement	MFL	Palm Beach	47 min
Aug 2, 4:07 PM EDT	Special Marine Warning	MFL		68 min
Aug 2, 4:31 PM EDT	Special Weather Statement	MFL	Palm Beach	44 min
Aug 2, 4:47 PM EDT	Special Weather Statement	MFL	Glades	43 min
Aug 2, 5:15 PM EDT	Special Marine Warning	MFL		45 min
Aug 2, 5:19 PM EDT	Special Weather Statement	MFL	Hendry	41 min
Aug 2, 5:54 PM EDT	Special Weather Statement	MFL	Hendry	51 min

Nearby

Special Marine Warnings in Florida, 2021 Every special marine warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.