Alert archive / Florida / Areal Flood Advisories in 2021

Areal Flood Advisory 192, NWS Mobile, AL

August 25, 2021Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this areal flood advisory at Aug 25, 2021, 11:02 PM CDT for Okaloosa County, Santa Rosa County, Florida. It was in force for 29 min.

The area

The counties it named.

The facts

Issued: Aug 25, 2021, 11:02 PM CDT (04:02 UTC)
Expired: Aug 25, 2021, 11:31 PM CDT
In force: 29 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 85 km from the middle of the area, began a volume at 04:04 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, 4.0 hours before the alert went out and 242 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: 566 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 933 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this areal flood advisory went out at Aug 25, 10:37 PM CDT, 25 minutes earlier.

Area forecast discussion, Aug 25, 10:37 PM CDT, 25 minutes before

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In the hours before

Special weather statement, Aug 25, 5:46 PM CDT, 5 hours 16 minutes before

Special Weather Statement
National Weather Service Mobile AL
546 PM CDT Wed Aug 25 2021

ALZ053-252330-
Clarke AL-
546 PM CDT Wed Aug 25 2021

...A strong thunderstorm will impact portions of northern Clarke
County through 630 PM CDT...

At 544 PM CDT, Doppler radar was tracking a strong thunderstorm near
Fulton, or near Grove Hill, moving west at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Grove Hill, Whatley and Fulton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3181 8760 3163 8763 3164 8806 3191 8801
TIME...MOT...LOC 2244Z 098DEG 16KT 3174 8774

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

JEH

Special weather statement, Aug 25, 6:39 PM CDT, 4 hours 23 minutes before

Special Weather Statement
National Weather Service Mobile AL
639 PM CDT Wed Aug 25 2021

ALZ051-MSZ067-260030-
Choctaw AL-Wayne MS-
639 PM CDT Wed Aug 25 2021

...A strong thunderstorm will impact portions of southwestern Choctaw
and northeastern Wayne Counties through 730 PM CDT...

At 639 PM CDT, Doppler radar was tracking a strong thunderstorm over
Silas, or 19 miles northeast of Waynesboro, moving west at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Silas and Gilbertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3187 8822 3170 8824 3170 8874 3184 8872
      3189 8848 3192 8847
TIME...MOT...LOC 2339Z 096DEG 18KT 3180 8835

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

JEH

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 5:14 PM CDT	Special Marine Warning	MOB		91 min
Aug 26, 5:47 PM CDT	Special Weather Statement	MOB	Mobile	43 min
Aug 26, 6:07 PM CDT	Special Marine Warning	MOB		83 min
Aug 26, 6:27 PM CDT	Special Marine Warning	MOB		93 min
Aug 25, 10:55 PM CDT	Areal Flood Advisory	MOB	Escambia	33 min
Aug 25, 11:25 PM CDT	Flash Flood Warning	MOB	Escambia	6 hr
Aug 25, 11:30 PM CDT	Flash Flood Warning	MOB	Okaloosa, Santa Rosa	6 hr
Aug 26, 2:49 PM CDT	Special Weather Statement	MOB	Stone	26 min

Nearby

Areal Flood Advisories in Florida, 2021 Every areal flood 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.