Alert archive / Florida / High Surf Advisories in 2021

High Surf Advisory 5, NWS Tallahassee, FL

August 17, 20214 counties in Florida

NWS Tallahassee, FL issued this high surf advisory at Aug 17, 2021, 2:32 AM CDT for 4 counties in Florida. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Aug 17, 2021, 2:32 AM CDT (07:32 UTC)
Expired
Aug 17, 2021, 8:00 AM CDT
In force
5 hr
Issued by
NWS Tallahassee, FL

Counties Bay County, FL, Franklin County, FL, Gulf County, FL, Walton County, FL

The radar

The Eglin Afb radar (KEVX), 64 km from the middle of the area, began a volume at 07:35 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 00:00Z, 7.5 hours before the alert went out and 116 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2021-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 624 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2021-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 457 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
624 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
457 m²/s²
0-3 km storm-relative helicity
592 m²/s²
Significant tornado parameter
1.4
Supercell composite
11.1

Open this sounding in Storm Lab

The text

As transmitted.

010 
WHUS42 KTAE 170732
CFWTAE

Coastal Hazard Message
National Weather Service Tallahassee FL
332 AM EDT Tue Aug 17 2021

FLZ108-112-114-180000-
/O.CAN.KTAE.SU.W.0001.000000T0000Z-210818T0000Z/
/O.NEW.KTAE.SU.Y.0005.210817T0732Z-210817T1300Z/
/O.CAN.KTAE.CF.Y.0001.000000T0000Z-210817T1800Z/
/O.CON.KTAE.RP.S.0075.000000T0000Z-210819T0000Z/
South Walton-Coastal Bay-Coastal Gulf-
332 AM EDT Tue Aug 17 2021 /232 AM CDT Tue Aug 17 2021/

...HIGH SURF ADVISORY IN EFFECT UNTIL 9 AM EDT /8 AM CDT/ THIS
MORNING...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH WEDNESDAY
EVENING...
...HIGH SURF WARNING IS CANCELLED...
...COASTAL FLOOD ADVISORY IS CANCELLED...

* WHAT...For the High Surf Advisory, large breaking waves of 3 
  to 7 feet in the surf zone. For the High Rip Current Risk, 
  dangerous rip currents.

* WHERE...Walton, Bay, and Gulf County Beaches.

* WHEN...For the High Surf Advisory, until 9 AM EDT /8 AM CDT/ 
  this morning. For the High Rip Current Risk, through Wednesday 
  evening.

* IMPACTS...Dangerous swimming and surfing conditions and 
  localized beach erosion. Rip currents can sweep even the best 
  swimmers away from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.

Swim near a lifeguard. If caught in a rip current, relax and
float. Don't swim against the current. If able, swim in a
direction following the shoreline. If unable to escape, face the
shore and call or wave for help.

&&

$$

FLZ115-180000-
/O.CAN.KTAE.SU.W.0001.000000T0000Z-210818T0000Z/
/O.NEW.KTAE.SU.Y.0005.210817T0732Z-210817T1300Z/
/O.CON.KTAE.RP.S.0075.000000T0000Z-210819T0000Z/
Coastal Franklin-
332 AM EDT Tue Aug 17 2021

...HIGH SURF ADVISORY IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH WEDNESDAY
EVENING...
...HIGH SURF WARNING IS CANCELLED...

* WHAT...For the High Surf Advisory, large breaking waves of 4 
  to 9 feet in the surf zone. For the High Rip Current Risk, 
  dangerous rip currents.

* WHERE...Franklin County Beaches.

* WHEN...For the High Surf Advisory, until 9 AM EDT this 
  morning. For the High Rip Current Risk, through Wednesday 
  evening.

* IMPACTS...Dangerous swimming and surfing conditions and 
  localized beach erosion. Rip currents can sweep even the best 
  swimmers away from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.

Swim near a lifeguard. If caught in a rip current, relax and
float. Don't swim against the current. If able, swim in a
direction following the shoreline. If unable to escape, face the
shore and call or wave for help.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 7:54 PM CDTAreal Flood AdvisoryTAEMadison, Taylor3 hr
Aug 16, 8:13 PM CDTAreal Flood WarningTAEBay, Calhoun, Gulf, Holmes, Jackson, Washington12 hr
Aug 16, 10:02 PM CDTSmall Craft AdvisoryTAE15 hr
Aug 16, 10:17 PM CDTRiver Flood WarningTAEJackson11 hr
Aug 17, 12:02 PM CDTRiver Flood WarningTAEDixie, Gilchrist, Levy44 hr

Nearby

High Surf Advisories in Florida, 2021Every high surf advisory 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.