Alert archive / Florida / Special Marine Warnings in 2021
Special Marine Warning 252, NWS Key West, FL
NWS Key West, FL issued this special marine warning at Oct 28, 2021, 7:13 PM EDT. It was in force for 62 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 28, 2021, 7:13 PM EDT (23:13 UTC)
- Expired
- Oct 28, 2021, 8:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Key West, FL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Miami radar (KAMX), 143 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 162 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
- 1570 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted.
528
WHUS52 KKEY 282313
SMWKEY
GMZ072-290015-
/O.NEW.KKEY.MA.W.0252.211028T2313Z-211029T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Key West FL
713 PM EDT Thu Oct 28 2021
The National Weather Service in Key West has issued a
* Special Marine Warning for...
Straits of Florida from Ocean Reef to Craig Key 20 to 60 nm out...
* Until 815 PM EDT.
* At 712 PM EDT, a strong thunderstorm was located 18 nm northeast of
Elbow Cay, moving northeast at 25 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...National Weather Service Meteorologist.
IMPACT...Expect wind gusts in excess of 34 knots, suddenly higher
waves, frequent lightning, and heavy downpours.
* The strong thunderstorm will remain over mainly open waters.
LAT...LON 2443 7967 2408 8009 2425 8029 2474 8018
TIME...MOT...LOC 2312Z 227DEG 28KT 2423 8014
HAIL...0.00IN
WIND...>34KTS
$$
KR2 follow-up statements
184
FZUS72 KKEY 282345
MWSKEY
Marine Weather Statement
National Weather Service Key West FL
745 PM EDT Thu Oct 28 2021
GMZ072-290015-
/O.CON.KKEY.MA.W.0252.000000T0000Z-211029T0015Z/
745 PM EDT Thu Oct 28 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 815 PM EDT...
For the following areas...
Straits of Florida from Ocean Reef to Craig Key 20 to 60 nm out...
At 745 PM EDT, a strong thunderstorm was located 23 nm southeast of
Floyd's Wall Northeast, moving northeast at 25 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...National Weather Service Meteorologist.
IMPACT...Expect wind gusts in excess of 34 knots, suddenly higher
waves, frequent lightning, and heavy downpours.
The strong thunderstorm will remain over mainly open waters.
LAT...LON 2443 7967 2408 8009 2425 8029 2474 8018
TIME...MOT...LOC 2345Z 227DEG 28KT 2441 7993
HAIL...0.00IN
WIND...>34KTS
$$
KR756 FZUS72 KKEY 290014 MWSKEY Marine Weather Statement National Weather Service Key West FL 814 PM EDT Thu Oct 28 2021 GMZ072-290021- /O.EXP.KKEY.MA.W.0252.000000T0000Z-211029T0015Z/ 814 PM EDT Thu Oct 28 2021 ...THE SPECIAL MARINE WARNING WILL EXPIRE AT 815 PM EDT... LAT...LON 2443 7967 2408 8009 2425 8029 2474 8018 TIME...MOT...LOC 0011Z 227DEG 28KT 2454 7978 $$ KR
The office that day
Everything else NWS Key West, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 28, 4:21 PM EDT | Small Craft Advisory | KEY | 60 hr | |
| Oct 28, 5:09 PM EDT | Special Marine Warning | KEY | 96 min | |
| Oct 28, 6:49 PM EDT | Special Marine Warning | KEY | 25 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.