Alert archive / Florida / Areal Flood Advisories in 2021

Areal Flood Advisory 216, NWS Mobile, AL

September 16, 2021Okaloosa County, Florida

NWS Mobile, AL issued this areal flood advisory at Sep 16, 2021, 3:35 PM CDT for Okaloosa County, Florida. It was in force for 115 min.

The area

The counties it named.

The facts

Issued: Sep 16, 2021, 3:35 PM CDT (20:35 UTC)
Expired: Sep 16, 2021, 5:30 PM CDT
In force: 115 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 65 km from the middle of the area, began a volume at 20:35 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 12:00Z, 8.6 hours before the alert went out and 221 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: 618 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Sep 16, 1:40 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Sep 16, 1:40 PM CDT, 1 hour 55 minutes before

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In the hours before

Local storm report, Sep 16, 11:51 AM CDT, 3 hours 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
1151 AM CDT THU SEP 16 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     FLASH FLOOD      3 WSW MYRTLE GROVE      30.40N 87.35W
09/15/2021                   ESCAMBIA           FL   PUBLIC

            SOCIAL MEDIA PICTURES OF STREETS FLOODED IN
            THE SHANGRI-LA NEIGHBORHOOD OFF OF HIGHWAY
            98. TIME ESTIMATED.

0340 PM     FLASH FLOOD      1 NNE MYRTLE GROVE      30.43N 87.30W
09/15/2021                   ESCAMBIA           FL   PUBLIC

            SOCIAL MEDIA PICTURES OF A FLOODING PARKING
            LOT WITH WATER UP TO THE TOP OF TIRES.

&&

Special weather statement, Sep 16, 12:10 PM CDT, 3 hours 25 minutes before

Special Weather Statement
National Weather Service Mobile AL
1210 PM CDT Thu Sep 16 2021

FLZ203>205-161800-
Okaloosa Inland FL-Santa Rosa Coastal FL-Santa Rosa Inland FL-
1210 PM CDT Thu Sep 16 2021

...A strong thunderstorm will impact portions of west central
Okaloosa and southeastern Santa Rosa Counties through 100 PM CDT...

At 1209 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northwest of Navarre, or 7 miles south of Bagdad, moving
northeast at 25 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...
Navarre and Navarre Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3038 8705 3040 8708 3044 8688 3045 8691
      3050 8703 3044 8709 3052 8711 3059 8703
      3051 8705 3051 8702 3052 8699 3058 8698
      3060 8702 3073 8687 3056 8667 3041 8681
      3039 8687 3038 8684
TIME...MOT...LOC 1709Z 222DEG 21KT 3050 8699

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

MM

Local storm report, Sep 16, 2:49 PM CDT, 46 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 1:11 AM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Sep 16, 3:51 AM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
Sep 16, 12:07 PM CDT	Special Marine Warning	MOB		38 min
Sep 16, 1:24 PM CDT	Special Marine Warning	MOB		66 min
Sep 16, 5:18 AM CDT	Areal Flood Advisory	MOB	Okaloosa	117 min
Sep 16, 8:22 AM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr
Sep 16, 12:10 PM CDT	Special Weather Statement	MOB	Santa Rosa	50 min
Sep 16, 12:26 PM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	3 hr
Sep 16, 2:14 PM CDT	Flash Flood Warning	MOB	Okaloosa, Santa Rosa	6 hr
Sep 16, 4:04 PM CDT	Flash Flood Warning	MOB	Okaloosa	6 hr
Sep 16, 4:55 AM CDT	Areal Flood Advisory	MOB	George, Stone	3 hr

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.