Alert archive / Florida / Special Marine Warnings in 2021
Special Marine Warning 21, NWS Tallahassee, FL
NWS Tallahassee, FL issued this special marine warning at Jan 31, 2021, 11:28 AM EST. It was in force for 107 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
- Jan 31, 2021, 11:28 AM EST (16:28 UTC)
- Expired
- Jan 31, 2021, 1:15 PM EST
- In force
- 107 min
- Issued by
- NWS Tallahassee, FL
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Tallahassee radar (KTLH), 62 km from the middle of the area, began a volume at 16:29 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.5 hours before the alert went out and 62 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 924 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 493 m²/s²
- 0-3 km storm-relative helicity
- 546 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
513
WHUS52 KTAE 311628
SMWTAE
GMZ730-755-765-775-311930-
/O.NEW.KTAE.MA.W.0021.210131T1628Z-210131T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Tallahassee FL
1128 AM EST Sun Jan 31 2021
The National Weather Service in Tallahassee has issued a
* Special Marine Warning for...
Apalachee Bay or Coastal Waters From Keaton Beach to Ochlockonee
River Fl out to 20 Nm...
Coastal Waters From Ochlockonee River to Apalachicola FL out to 20
Nm...
Coastal waters from Suwannee River to Keaton Beach out 20 NM...
Waters from Suwannee River to Apalachicola FL from 20 to 60 NM...
* Until 230 PM EST.
* At 1127 AM EST, showers with gusty winds were located along a line
extending from 7 nm southeast of St. Marks to 7 nm northwest of C
Tower, moving east at 25 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...Radar indicated.
IMPACT...Expect wind gusts in excess of 34 knots...suddenly higher
waves...and heavy downpours. Make sure all on board are
wearing life jackets.
* Locations impacted include...
Buckeye Reef, O Tower, C Tower, K Tower and Marker 24 Barge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek safe shelter, mariners can expect gusty winds and increasing
waves.
&&
LAT...LON 3004 8383 3004 8375 2984 8354 2952 8401
2930 8485 2940 8498 2953 8498 2993 8455
2996 8449 3013 8433 3013 8410 3016 8399
TIME...MOT...LOC 1627Z 263DEG 24KT 3005 8415 2952 8493
HAIL...0.00IN
WIND...>34KTS
$$
42-DVD1 follow-up statement
350
FZUS72 KTAE 311815
MWSTAE
Marine Weather Statement
National Weather Service Tallahassee FL
115 PM EST Sun Jan 31 2021
GMZ730-755-765-775-311825-
/O.CAN.KTAE.MA.W.0021.000000T0000Z-210131T1930Z/
115 PM EST Sun Jan 31 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Apalachee Bay or Coastal Waters From Keaton Beach to Ochlockonee
River Fl out to 20 Nm...
Coastal Waters From Ochlockonee River to Apalachicola FL out to 20
Nm...
Coastal waters from Suwannee River to Keaton Beach out 20 NM...
Waters from Suwannee River to Apalachicola FL from 20 to 60 NM...
The showers have weakened and no longer pose a significant threat to
boaters.
LAT...LON 3004 8383 3004 8375 2984 8354 2952 8401
2930 8485 2940 8498 2953 8498 2993 8455
2996 8449 3013 8433 3013 8410 3016 8399
TIME...MOT...LOC 1814Z 263DEG 24KT 3013 8333 2961 8411
$$
42-DVDThe office that day
Everything else NWS Tallahassee, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 31, 8:31 AM EST | Special Marine Warning | TAE | 3 hr | |
| Jan 31, 5:38 PM EST | Special Weather Statement | TAE | Cook, Lanier | 52 min |
| Jan 31, 6:25 PM EST | Special Weather Statement | TAE | Lanier | 50 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.