Alert archive / Florida / Areal Flood Advisories in 2021

Areal Flood Advisory 160, NWS Mobile, AL

July 31, 2021Okaloosa County, Florida

NWS Mobile, AL issued this areal flood advisory at Jul 31, 2021, 9:40 PM CDT for Okaloosa County, Florida. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 31, 2021, 9:40 PM CDT (02:40 UTC)
Expired
Jul 31, 2021, 11:45 PM CDT
In force
2 hr
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 02:41 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, 2.7 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2021-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1786 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2021-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939Sfc1 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
1786 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1181 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
99 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 Jul 31, 7:59 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 31, 7:59 PM CDT, 1 hour 41 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Special weather statement, Jul 31, 7:14 PM CDT, 2 hours 26 minutes before
Special Weather Statement
National Weather Service Mobile AL
714 PM CDT Sat Jul 31 2021

FLZ205-206-010115-
Okaloosa Inland FL-Okaloosa Coastal FL-
714 PM CDT Sat Jul 31 2021

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING
COUNTIES...SOUTHERN OKALOOSA COUNTY UNTIL 815 PM CDT...

At 713 PM CDT, the strong thunderstorms were located along a broken
line extending from 10 miles southwest of Crestview to 9 miles
northwest of Eglin Air Force Base, and moving southeast at 10 mph.

Wind gusts of 40 to 50 mph will be possible with these storms.

Locations impacted include...
Niceville, Eglin AFB and Valparaiso.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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

&&

LAT...LON 3046 8643 3050 8645 3050 8648 3052 8650
      3048 8648 3046 8650 3046 8659 3047 8659
      3046 8661 3046 8679 3071 8679 3078 8639
      3046 8640
TIME...MOT...LOC 0013Z 327DEG 8KT 3063 8667 3072 8637
Special weather statement, Jul 31, 7:24 PM CDT, 2 hours 16 minutes before
Special Weather Statement
National Weather Service Mobile AL
724 PM CDT Sat Jul 31 2021

ALZ056-059-010130-
Conecuh AL-Escambia AL-
724 PM CDT Sat Jul 31 2021

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...CENTRAL
ESCAMBIA AND SOUTHWESTERN CONECUH COUNTIES UNTIL 830 PM CDT...

At 724 PM CDT, the strong thunderstorm was located 4 miles north of
Brewton, moving southeast at 10 mph.

Wind gusts of 40 to 50 mph will be possible with this storm.

Locations impacted include...
Brewton, East Brewton, Pollard, Riverview and I65 And AL 113.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3100 8709 3100 8712 3124 8760 3123 8755
      3125 8752 3125 8751 3126 8748 3126 8743
      3128 8742 3132 8736 3133 8735 3139 8720
      3118 8684
TIME...MOT...LOC 0024Z 307DEG 8KT 3116 8705
Special weather statement, Jul 31, 8:10 PM CDT, 1 hour 30 minutes before
Special Weather Statement
National Weather Service Mobile AL
810 PM CDT Sat Jul 31 2021

ALZ055-059-262-010215-
Baldwin Inland AL-Monroe AL-Escambia AL-
810 PM CDT Sat Jul 31 2021

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...
SOUTHWESTERN MONROE...NORTH CENTRAL BALDWIN AND NORTHWESTERN ESCAMBIA
COUNTIES UNTIL 915 PM CDT...

At 810 PM CDT, the strong thunderstorm was located 6 miles west of
Uriah, or 14 miles southwest of Frisco City, moving southeast at 10
mph.

Winds of 30 to 40 mph will be possible with this storm.

Locations impacted include...
McCullough, Uriah, I65 And CR 1, I65 And AL 113, I65 And AL 21 and
Poarch Creek Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3131 8773 3142 8751 3131 8738 3128 8742
      3126 8743 3126 8732 3119 8724 3103 8765
TIME...MOT...LOC 0110Z 327DEG 9KT 3131 8761
Special weather statement, Jul 31, 8:16 PM CDT, 1 hour 24 minutes before
Special Weather Statement
National Weather Service Mobile AL
816 PM CDT Sat Jul 31 2021

FLZ201>203-010200-
Escambia Inland FL-Escambia Coastal FL-Santa Rosa Inland FL-
816 PM CDT Sat Jul 31 2021

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...WEST
CENTRAL SANTA ROSA AND CENTRAL ESCAMBIA COUNTIES UNTIL 900 PM CDT...

At 816 PM CDT, the strong thunderstorm was located 5 miles northwest
of Molino, or 13 miles southwest of Century, moving southeast at 10
mph.

Winds of 30 to 40 mph will be possible with this storm.

Locations impacted include...
Gonzalez and Molino.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3052 8730 3080 8746 3088 8734 3069 8710
      3061 8719 3061 8725 3060 8724 3060 8723
      3058 8723
TIME...MOT...LOC 0116Z 319DEG 11KT 3079 8736
Special weather statement, Jul 31, 8:27 PM CDT, 1 hour 13 minutes before
Special Weather Statement
National Weather Service Mobile AL
827 PM CDT Sat Jul 31 2021

ALZ059-FLZ203>205-010215-
Escambia AL-Okaloosa Inland FL-Santa Rosa Coastal FL-
Santa Rosa Inland FL-
827 PM CDT Sat Jul 31 2021

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING
COUNTIES...SOUTHEASTERN ESCAMBIA...WEST CENTRAL OKALOOSA AND
NORTHEASTERN SANTA ROSA COUNTIES UNTIL 915 PM CDT...

At 827 PM CDT, the strong thunderstorms were located along a broken
line extending from 4 miles southeast of Jay to 13 miles southeast
of Riverview, and moving south at 20 mph.

Winds in excess of 30 mph will be possible with these storms.

Locations impacted include...
Milton, Bagdad, Jay, Point Baker and Roeville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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

&&

LAT...LON 3097 8721 3099 8718 3106 8685 3065 8660
      3058 8696 3058 8700 3060 8702 3059 8703
      3057 8701 3056 8707
TIME...MOT...LOC 0127Z 340DEG 18KT 3091 8709 3096 8687
Special weather statement, Jul 31, 9:18 PM CDT, 22 minutes before
Special Weather Statement
National Weather Service Mobile AL
918 PM CDT Sat Jul 31 2021

FLZ203>205-010315-
Okaloosa Inland FL-Santa Rosa Coastal FL-Santa Rosa Inland FL-
918 PM CDT Sat Jul 31 2021

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING
COUNTIES...WESTERN OKALOOSA AND CENTRAL SANTA ROSA COUNTIES UNTIL
1015 PM CDT...

At 917 PM CDT, the strong thunderstorms were located along a line
extending from near Pea Ridge to 12 miles east of Roeville, and
moving east at 10 mph.

Winds of 30 to 40 mph will be possible with these storms.

Locations impacted include...
Pace, Milton, Bagdad, Baker, Pea Ridge, Roeville, Floridatown and
Point Baker.

LAT...LON 3044 8710 3052 8710 3058 8715 3058 8718
      3055 8717 3055 8720 3056 8720 3078 8727
      3089 8670 3051 8658 3046 8692 3051 8702
      3052 8699 3058 8698 3060 8702 3057 8700
      3054 8704 3045 8707 3044 8709
TIME...MOT...LOC 0217Z 290DEG 10KT 3062 8710 3063 8679

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 7:04 PM CDTSpecial Marine WarningMOB86 min
Jul 31, 7:24 PM CDTSpecial Weather StatementMOBEscambia66 min
Jul 31, 7:43 PM CDTSpecial Marine WarningMOB92 min
Jul 31, 8:10 PM CDTSpecial Weather StatementMOBEscambia65 min
Jul 31, 10:22 PM CDTSpecial Marine WarningMOB57 min
Jul 31, 11:18 PM CDTSpecial Marine WarningMOB47 min
Jul 31, 11:58 PM CDTSpecial Marine WarningMOB46 min
Aug 1, 6:14 PM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile26 min
Jul 31, 7:00 PM CDTSpecial Weather StatementMOBSanta Rosa45 min
Jul 31, 7:14 PM CDTSpecial Weather StatementMOBOkaloosa61 min
Jul 31, 8:16 PM CDTSpecial Weather StatementMOBEscambia44 min
Jul 31, 8:27 PM CDTSpecial Weather StatementMOBSanta Rosa48 min
Jul 31, 9:18 PM CDTSpecial Weather StatementMOBSanta Rosa57 min
Aug 1, 3:31 PM CDTSpecial Weather StatementMOBJackson44 min
Aug 1, 3:51 PM CDTSpecial Weather StatementMOBPerry39 min
Aug 1, 4:26 PM CDTSevere Thunderstorm WarningMOBGeorge, Perry, Stone18 min
Aug 1, 4:39 PM CDTSpecial Weather StatementMOBWayne51 min
Aug 1, 4:48 PM CDTSpecial Weather StatementMOBStone57 min

Nearby

Areal Flood Advisories in Florida, 2021Every 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.