Alert archive / Alabama / Areal Flood Advisories in 2021

Areal Flood Advisory 188, NWS Mobile, AL

August 22, 2021Choctaw County, Clarke County, Alabama

NWS Mobile, AL issued this areal flood advisory at Aug 22, 2021, 5:40 PM CDT for Choctaw County, Clarke County, Alabama. It was in force for 106 min.

The area

The counties it named.

The facts

Issued: Aug 22, 2021, 5:40 PM CDT (22:40 UTC)
Expired: Aug 22, 2021, 7:26 PM CDT
In force: 106 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL

The radar

The Mobile radar (KMOB), 131 km from the middle of the area, began a volume at 22:42 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

Jackson, MS (KJAN), launched 12:00Z, 10.7 hours before the alert went out and 199 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: 986 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 105 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 Aug 22, 4:07 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Aug 22, 4:07 PM CDT, 1 hour 33 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, Aug 22, 5:09 PM CDT, 31 minutes before

Special Weather Statement
National Weather Service Mobile AL
509 PM CDT Sun Aug 22 2021

ALZ054-222245-
Wilcox AL-
509 PM CDT Sun Aug 22 2021

...A strong thunderstorm will impact portions of southeastern Wilcox
County through 545 PM CDT...

At 506 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Pine Apple, or 10 miles east of Camden, moving
southeast 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...
Camden and Pine Apple.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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 3205 8718 3205 8706 3193 8691 3183 8691
      3183 8711 3199 8737 3206 8718
TIME...MOT...LOC 2206Z 313DEG 19KT 3197 8711

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 21, 7:25 PM CDT	Special Weather Statement	MOB	Escambia	50 min
Aug 22, 6:01 AM CDT	Rip Current Statement	MOB	Baldwin, Mobile	12 hr
Aug 22, 5:09 PM CDT	Special Weather Statement	MOB	Wilcox	36 min
Aug 22, 6:01 PM CDT	Special Weather Statement	MOB	Clarke	44 min
Aug 22, 6:39 PM CDT	Special Weather Statement	MOB	Crenshaw	36 min
Aug 21, 8:24 PM CDT	Areal Flood Advisory	MOB	Okaloosa	3 hr

Nearby

Areal Flood Advisories in Alabama, 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.