Alert archive / Florida / Special Marine Warnings in 2021
Special Marine Warning 430, NWS Miami, FL
NWS Miami, FL issued this special marine warning at Sep 1, 2021, 6:00 PM EDT. It was in force for 48 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
- Sep 1, 2021, 6:00 PM EDT (22:00 UTC)
- Expired
- Sep 1, 2021, 6:48 PM EDT
- In force
- 48 min
- Issued by
- NWS Miami, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 34.0 mph
The radar
The Miami radar (KAMX), 83 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 57 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.
- Mixed-layer CAPE
- 1720 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 876 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
579
WHUS52 KMFL 012200
SMWMFL
AMZ650-651-012300-
/O.NEW.KMFL.MA.W.0430.210901T2200Z-210901T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Miami FL
600 PM EDT Wed Sep 1 2021
The National Weather Service in Miami has issued a
* Special Marine Warning for...
Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM...
Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20
NM...
* Until 700 PM EDT.
* At 600 PM EDT, a severe thunderstorm capable of producing
waterspouts was located over Hillsboro Beach, or over Lighthouse
Point, moving east at 10 knots.
HAZARD...Waterspouts, wind gusts 34 knots or greater, and small
hail.
SOURCE...Radar.
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...
Lauderdale-By-The-Sea, Deerfield Beach, Port Everglades, Fort
Lauderdale, Lighthouse Point, Boca Raton, Highland Beach, Sea Ranch
Lakes, Pompano Beach, Hillsboro Beach, Delray Beach and Hollywood.
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 2627 7985 2608 7987 2605 8016 2618 8017
2640 8014 2653 7992
TIME...MOT...LOC 2200Z 250DEG 11KT 2628 8006
WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...>34KTS
$$
SPM2 follow-up statements
065
FZUS72 KMFL 012231
MWSMFL
Marine Weather Statement
National Weather Service Miami FL
631 PM EDT Wed Sep 1 2021
AMZ650-651-012300-
/O.CON.KMFL.MA.W.0430.000000T0000Z-210901T2300Z/
631 PM EDT Wed Sep 1 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 700 PM EDT...
For the following areas...
Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM...
Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM...
At 631 PM EDT, a severe thunderstorm capable of producing waterspouts
was located near Hillsboro Beach, or 7 nm east of Lighthouse Point,
moving east at 10 knots.
HAZARD...Waterspouts, wind gusts 34 knots or greater, and small
hail.
SOURCE...Radar indicated.
IMPACT...Waterspouts can easily overturn boats and create locally
hazardous seas. Small craft could be damaged in briefly
higher winds and suddenly higher waves.
Locations impacted include...
Highland Beach, Boca Raton, Delray Beach and Deerfield Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor until hazardous weather passes.
Report severe weather to the Coast Guard or the National Weather
Service. You can also share your report with NWS Miami on Facebook
and Twitter.
&&
LAT...LON 2627 7985 2618 7986 2613 7987 2610 7997
2618 8004 2642 8011 2653 7992
TIME...MOT...LOC 2231Z 250DEG 11KT 2631 7996
WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...>34KTS
$$
SPM703
FZUS72 KMFL 012248
MWSMFL
Marine Weather Statement
National Weather Service Miami FL
648 PM EDT Wed Sep 1 2021
AMZ650-651-012258-
/O.CAN.KMFL.MA.W.0430.000000T0000Z-210901T2300Z/
648 PM EDT Wed Sep 1 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM...
Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM...
The thunderstorm has moved out of the area and no longer poses a
significant threat to boaters.
LAT...LON 2627 7985 2618 7986 2613 7987 2610 7997
2618 8004 2642 8011 2653 7992
TIME...MOT...LOC 2247Z 250DEG 11KT 2633 7990
$$
SPMThe office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 5:07 PM EDT | Special Weather Statement | MFL | Broward | 23 min |
| Sep 1, 5:35 PM EDT | Special Weather Statement | MFL | Broward | 25 min |
| Sep 1, 5:36 PM EDT | Special Weather Statement | MFL | Miami-Dade | 24 min |
| Sep 1, 6:00 PM EDT | Special Weather Statement | MFL | Broward | 30 min |
| Sep 1, 6:01 PM EDT | Special Marine Warning | MFL | 44 min | |
| Sep 1, 6:07 PM EDT | Special Marine Warning | MFL | 31 min | |
| Sep 1, 6:19 PM EDT | Special Marine Warning | MFL | 26 min | |
| Sep 1, 6:29 PM EDT | Special Marine Warning | MFL | 28 min | |
| Sep 1, 6:51 PM EDT | Special Marine Warning | MFL | 25 min | |
| Sep 1, 6:53 PM EDT | Special Weather Statement | MFL | Miami-Dade | 37 min |
| Sep 1, 6:58 PM EDT | Special Marine Warning | MFL | 47 min |
Nearby
Special Marine Warnings in Florida, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.