Alert archive / Florida / Special Marine Warnings in 2021
Special Marine Warning 21, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this special marine warning at Feb 15, 2021, 8:26 PM EST. It was in force for 94 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
- Feb 15, 2021, 8:26 PM EST (01:26 UTC)
- Expired
- Feb 15, 2021, 10:00 PM EST
- In force
- 94 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 40.0 mph
The radar
The Tampa radar (KTBW), 111 km from the middle of the area, began a volume at 01:30 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 00:00Z, 1.4 hours before the alert went out and 111 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
- 1356 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 856 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 197 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.7
The text
As transmitted.
431
WHUS52 KTBW 160126
SMWTBW
GMZ850-853-870-873-160300-
/O.NEW.KTBW.MA.W.0021.210216T0126Z-210216T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Tampa Bay Area Ruskin FL
826 PM EST Mon Feb 15 2021
The National Weather Service in Ruskin has issued a
* Special Marine Warning for...
Coastal waters from Englewood to Tarpon Springs FL out 20 NM...
Coastal waters from Tarpon Springs to Suwannee River FL out 20
NM...
Waters from Englewood to Tarpon Springs FL out 20 to 60 NM...
Waters from Tarpon Springs to Suwannee River FL out 20 to 60 NM...
* Until 1000 PM EST.
* At 825 PM EST, severe thunderstorms capable of producing
waterspouts were located along a line extending from near
Yankeetown to 50 nm west of Indian Rocks Beach, moving east at 20
knots.
HAZARD...Waterspouts and wind gusts to 40 knots.
SOURCE...Radar.
IMPACT...Waterspouts can quickly form and capsize boats, damage
vessels, and create suddenly higher waves. Make sure all
on board are in a secure location and wearing life
jackets. Expect wind gusts in excess of 34 knots,
suddenly higher waves, frequent lightning, and heavy
downpours. Make sure all on board are wearing life
jackets.
* Locations impacted include...
Ozello, Crystal River, Hernando Beach, Clearwater Pass, Port
Richey, Anclote Key, Indian Shore Reef, Bayport, Tarpon Springs,
Yankeetown, Aripeka and Dunedin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 2915 8274 2890 8257 2854 8257 2812 8274
2777 8294 2771 8374 2803 8377 2923 8292
2924 8274
TIME...MOT...LOC 0125Z 257DEG 19KT 2907 8285 2777 8378
WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...40KTS
$$
TBWThe office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 15, 7:16 PM EST | Special Weather Statement | TBW | Levy | 59 min |
| Feb 15, 8:10 PM EST | Special Weather Statement | TBW | Levy | 50 min |
| Feb 15, 8:28 PM EST | Special Weather Statement | TBW | Citrus, Hernando | 47 min |
| Feb 15, 9:24 PM EST | Special Marine Warning | TBW | 96 min | |
| Feb 16, 3:18 AM EST | Rip Current Statement | TBW | Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota | 34 hr |
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.