Alert archive / Florida / Special Marine Warnings in 2021

Special Marine Warning 252, NWS Tallahassee, FL

August 2, 2021

NWS Tallahassee, FL issued this special marine warning at Aug 2, 2021, 6:48 PM EDT. 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: Aug 2, 2021, 6:48 PM EDT (22:48 UTC)
Expired: Aug 2, 2021, 8:22 PM EDT
In force: 94 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Tallahassee radar (KTLH), 75 km from the middle of the area, began a volume at 22:51 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, 10.8 hours before the alert went out and 77 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: 2573 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

531 
WHUS52 KTAE 022248
SMWTAE
GMZ730-752-755-765-775-030145-
/O.NEW.KTAE.MA.W.0252.210802T2248Z-210803T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Tallahassee FL
648 PM EDT Mon Aug 2 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 Mexico Beach to Apalachicola out 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 945 PM EDT/845 PM CDT/.

* At 648 PM EDT/548 PM CDT/, a strong thunderstorm was located 16 nm
  southwest of Apalachicola, 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...frequent lightning...and heavy downpours. Make 
           sure all on board are wearing life jackets.

* Locations impacted include...
  Buckeye Reef, O Tower, K Tower, V Tower, Apalachicola, Cape San
  Blas, St George Island and Marker 24 Barge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with this storm. If caught on the
open water stay below deck if possible, keep away from ungrounded
metal objects.

&&

LAT...LON 3004 8382 2940 8387 2942 8548 2969 8550
      2975 8526 2974 8526 2976 8504 2985 8485
      2981 8480 2992 8458 3008 8389
TIME...MOT...LOC 2248Z 262DEG 24KT 2956 8516 

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

$$

IG3

2 follow-up statements

270 
FZUS72 KTAE 022339
MWSTAE

Marine Weather Statement
National Weather Service Tallahassee FL
739 PM EDT Mon Aug 2 2021

GMZ730-752-755-765-775-030145-
/O.CON.KTAE.MA.W.0252.000000T0000Z-210803T0145Z/
739 PM EDT Mon Aug 2 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 945 PM EDT/845 PM
CDT/...

For the following areas...
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 Mexico Beach to Apalachicola out 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...

At 738 PM EDT/638 PM CDT/, a strong thunderstorm was located near St
George Island, 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...frequent lightning...and heavy downpours. Make sure 
         all on board are wearing life jackets.

Locations impacted include...
Buckeye Reef, O Tower, K Tower, V Tower, Apalachicola, St George
Island and Marker 24 Barge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with this storm. If caught on the
open water stay below deck if possible, keep away from ungrounded
metal objects.

&&

LAT...LON 3004 8383 3004 8382 2940 8387 2942 8498
      2979 8498 2985 8485 2981 8480 2992 8457
      3008 8389
TIME...MOT...LOC 2338Z 262DEG 24KT 2961 8478 

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

$$

IG3

196 
FZUS72 KTAE 030022
MWSTAE

Marine Weather Statement
National Weather Service Tallahassee FL
822 PM EDT Mon Aug 2 2021

GMZ730-752-755-765-775-030031-
/O.CAN.KTAE.MA.W.0252.000000T0000Z-210803T0145Z/
822 PM EDT Mon Aug 2 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 Mexico Beach to Apalachicola out 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 thunderstorm has weakened and no longer poses a significant
threat to boaters.

LAT...LON 3004 8383 3004 8382 2940 8387 2942 8498
      2979 8498 2985 8485 2981 8480 2992 8457
      3008 8389
TIME...MOT...LOC 0020Z 262DEG 24KT 2965 8445 

$$

55-SCHOLL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 10:32 AM EDT	Flash Flood Watch	TAE	Bay, Calhoun, Dixie, Franklin, Gulf, Jefferson and 5 more	5 days
Aug 2, 5:04 PM EDT	Special Weather Statement	TAE	Jackson	41 min
Aug 1, 9:26 PM EDT	Special Weather Statement	TAE	Lee, Turner, Worth	49 min
Aug 1, 9:46 PM EDT	Severe Thunderstorm Warning	TAE	Lee, Turner, Worth	29 min
Aug 1, 10:13 PM EDT	Special Weather Statement	TAE	Ben Hill, Irwin, Lee, Tift, Turner, Worth	47 min
Aug 1, 10:56 PM EDT	Special Weather Statement	TAE	Ben Hill, Irwin	34 min
Aug 1, 10:58 PM EDT	Special Weather Statement	TAE	Dougherty, Worth	47 min
Aug 2, 3:23 PM EDT	Special Weather Statement	TAE	Lee	37 min
Aug 2, 3:44 PM EDT	Areal Flood Advisory	TAE	Randolph, Terrell	2 hr
Aug 2, 3:47 PM EDT	Special Weather Statement	TAE	Baker	43 min
Aug 2, 4:01 PM EDT	Special Weather Statement	TAE	Berrien	44 min
Aug 2, 4:22 PM EDT	Special Weather Statement	TAE	Worth	23 min
Aug 2, 4:22 PM EDT	Special Weather Statement	TAE	Randolph	53 min
Aug 2, 4:43 PM EDT	Special Weather Statement	TAE	Worth	47 min
Aug 2, 4:48 PM EDT	Special Weather Statement	TAE	Randolph, Terrell	42 min
Aug 2, 5:29 PM EDT	Special Weather Statement	TAE	Turner	46 min
Aug 2, 5:54 PM EDT	Areal Flood Advisory	TAE	Dougherty, Lee, Worth	111 min
Aug 2, 6:05 PM EDT	Special Weather Statement	TAE	Cook, Lanier	40 min
Aug 2, 7:11 PM EDT	Special Weather Statement	TAE	Lanier	49 min
Aug 2, 7:13 PM EDT	Areal Flood Advisory	TAE	Berrien, Cook, Lanier, Lowndes	2 hr
Aug 2, 3:01 AM EDT	Special Weather Statement	TAE	Henry	44 min
Aug 2, 3:12 PM EDT	Special Weather Statement	TAE	Geneva	48 min
Aug 2, 4:13 PM EDT	Special Weather Statement	TAE	Houston	47 min
Aug 2, 5:14 PM EDT	Special Weather Statement	TAE	Coffee	46 min
Aug 2, 6:00 PM EDT	Areal Flood Advisory	TAE	Coffee	2 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.