Alert archive / Florida / High Surf Advisories in 2021

High Surf Advisory 11, NWS Mobile, AL

August 16, 2021Escambia County, Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this high surf advisory at Aug 16, 2021, 3:56 PM CDT for Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Aug 16, 2021, 3:56 PM CDT (20:56 UTC)
Expired
Aug 16, 2021, 9:57 PM CDT
In force
6 hr
Issued by
NWS Mobile, AL

Counties Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 102 km from the middle of the area, began a volume at 20:58 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, 8.9 hours before the alert went out and 259 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 12:00Z on 2021-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 368 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 12:00Z on 2021-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.193958Sfc1 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
368 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

068 
WHUS44 KMOB 162056
CFWMOB

Coastal Hazard Message
National Weather Service Mobile AL
356 PM CDT Mon Aug 16 2021

FLZ202-204-206-170500-
/O.CAN.KMOB.SU.W.0002.000000T0000Z-210817T1100Z/
/O.NEW.KMOB.SU.Y.0011.210816T2056Z-210817T1100Z/
/O.CON.KMOB.CF.Y.0004.000000T0000Z-210817T1800Z/
/O.CON.KMOB.RP.S.0021.000000T0000Z-210818T1100Z/
Escambia Coastal-Santa Rosa Coastal-Okaloosa Coastal-
356 PM CDT Mon Aug 16 2021

...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM CDT TUESDAY...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT
TUESDAY...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH LATE TUESDAY
NIGHT...
...HIGH SURF WARNING IS CANCELLED...

* WHAT...For the Coastal Flood Advisory, minor coastal flooding.
  For the High Surf Advisory, large breaking waves of 5 to 7 feet
  in the surf zone. For the High Rip Current Risk, dangerous rip 
  currents.

* WHERE...Escambia Coastal, Santa Rosa Coastal and Okaloosa 
  Coastal Counties.

* WHEN...For the Coastal Flood Advisory, until 1 PM CDT Tuesday. 
  For the High Surf Advisory, until 6 AM CDT Tuesday. For the 
  High Rip Current Risk, through late Tuesday night.

* IMPACTS...Flooding of lots, parks, and roads with only 
  isolated road closures expected. 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...

If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.

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.

&&

$$

ALZ265-266-170500-
/O.CON.KMOB.SU.Y.0010.000000T0000Z-210817T1100Z/
/O.CON.KMOB.RP.S.0021.000000T0000Z-210818T1100Z/
Mobile Coastal-Baldwin Coastal-
356 PM CDT Mon Aug 16 2021

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM CDT TUESDAY...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH LATE TUESDAY
NIGHT...

* WHAT...For the High Surf Advisory, large breaking waves of 5 to
  7 feet in the surf zone. For the High Rip Current Risk, 
  dangerous rip currents.

* WHERE...Baldwin Coastal and Mobile Coastal Counties.

* WHEN...For the High Surf Advisory, until 6 AM CDT Tuesday. For 
  the High Rip Current Risk, through late Tuesday night.

* 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.

&&

$$
1 follow-up statement
055 
WHUS44 KMOB 170257
CFWMOB

Coastal Hazard Message
National Weather Service Mobile AL
957 PM CDT Mon Aug 16 2021

FLZ202-204-206-171100-
/O.CAN.KMOB.CF.Y.0004.000000T0000Z-210817T1800Z/
/O.CAN.KMOB.SU.Y.0011.000000T0000Z-210817T1100Z/
/O.CON.KMOB.RP.S.0021.000000T0000Z-210818T1100Z/
Escambia Coastal-Santa Rosa Coastal-Okaloosa Coastal-
957 PM CDT Mon Aug 16 2021

...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH LATE TUESDAY
NIGHT...
...COASTAL FLOOD ADVISORY IS CANCELLED...
...HIGH SURF ADVISORY IS CANCELLED...

* WHAT...Dangerous rip currents.

* WHERE...Santa Rosa Coastal, Okaloosa Coastal and Escambia 
  Coastal Counties.

* WHEN...Through late Tuesday night.

* IMPACTS...Rip currents can sweep even the best swimmers away 
  from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$

ALZ265-266-171100-
/O.CAN.KMOB.SU.Y.0010.000000T0000Z-210817T1100Z/
/O.CON.KMOB.RP.S.0021.000000T0000Z-210818T1100Z/
Mobile Coastal-Baldwin Coastal-
957 PM CDT Mon Aug 16 2021

...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH LATE TUESDAY
NIGHT...
...HIGH SURF ADVISORY IS CANCELLED...

* WHAT...Dangerous rip currents.

* WHERE...Baldwin Coastal and Mobile Coastal Counties.

* WHEN...Through late Tuesday night.

* IMPACTS...Rip currents can sweep even the best swimmers away 
  from shore into deeper water.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 10:17 PM CDTWind AdvisoryMOBEscambia, Santa Rosa18 hr
Aug 16, 7:38 AM CDTRiver Flood WarningMOBOkaloosa13 hr
Aug 16, 3:57 PM CDTWind AdvisoryMOBOkaloosa6 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.