Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

July 20, 2021Autauga County, Elmore County, Macon County, Alabama

NWS Birmingham, AL issued this special weather statement at Jul 20, 2021, 2:04 PM CDT for Autauga County, Elmore County, Macon County, Alabama. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2021, 2:04 PM CDT (19:04 UTC)
Expired: Jul 20, 2021, 2:45 PM CDT
In force: 41 min
Issued by: NWS Birmingham, AL

Counties Autauga County, AL, Elmore County, AL, Macon County, AL

The radar

The Maxwell AFB radar (KMXX), 62 km from the middle of the area, began a volume at 19:07 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

Birmingham, AL (KBMX), launched 12:00Z, 7.1 hours before the alert went out and 87 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: 690 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 524 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

What forecasters said that day

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

NWS Birmingham, AL wrote its last area forecast discussion before this special weather statement went out at Jul 20, 1:13 PM CDT, 51 minutes earlier.

Area forecast discussion, Jul 20, 1:13 PM CDT, 51 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>

Hazardous weather outlook, Jul 20, 3:19 AM CDT, 10 hours 45 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
319 AM CDT Tue Jul 20 2021

ALZ011>015-017>050-211130-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
319 AM CDT Tue Jul 20 2021

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Periods of heavy rain at times may occur through tonight across
portions of Central Alabama. This could cause isolated areas of
flooding and ponding of water in low lying areas.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
through tonight.

In the hours before

Special weather statement, Jul 20, 12:14 PM CDT, 1 hour 50 minutes before

Special Weather Statement
National Weather Service Birmingham AL
1214 PM CDT Tue Jul 20 2021

ALZ049-201800-
Pike AL-
1214 PM CDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR PIKE COUNTY UNTIL 100 PM CDT...

At 1213 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles east of Georgiana to 7 miles northeast
of Elba. Movement was northeast at 20 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Troy, Brundidge, Goshen, Banks, Antioch, Ansley, Troy Municipal
Airport, Troy University, Tennille, Hamilton Crossroads, Monticello,
Josie, Tarentum, Brundidge Municipal Airport, Mossy Grove and
Henderson.

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 3166 8616 3166 8615 3179 8615 3179 8620
      3183 8618 3189 8617 3195 8618 3195 8614
      3190 8579 3188 8579 3188 8566 3186 8568
      3177 8567 3174 8570 3163 8573 3162 8575
      3162 8618
TIME...MOT...LOC 1713Z 229DEG 18KT 3167 8664 3151 8600

56

Special weather statement, Jul 20, 1:10 PM CDT, 54 minutes before

Special Weather Statement
National Weather Service Birmingham AL
110 PM CDT Tue Jul 20 2021

ALZ040>044-201900-
Autauga AL-Lowndes AL-Montgomery AL-Dallas AL-Elmore AL-
110 PM CDT Tue Jul 20 2021

...SIGNIFICANT WEATHER ADVISORY FOR AUTAUGA...SOUTHWESTERN ELMORE...
LOWNDES...SOUTHEASTERN DALLAS AND MONTGOMERY COUNTIES UNTIL 200 PM
CDT...

At 109 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Belknap to near Ansley. Movement was
northeast at 20 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Montgomery, Prattville, Millbrook, Wetumpka, Mosses, Hayneville,
Meadville, Pike Road, Elmore, Coosada, Deatsville, Autaugaville,
White Hall, Gordonville, Lowndesboro, Benton, Hyundai Motors Of
Alabama, Auburn University In Montgomery, Dublin and Tyler.

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 3205 8631 3205 8641 3197 8641 3215 8707
      3260 8686 3253 8600 3243 8601 3242 8602
      3238 8601 3234 8599 3228 8592 3227 8598
      3225 8600 3197 8600 3196 8630
TIME...MOT...LOC 1809Z 211DEG 19KT 3218 8695 3195 8608

56

Special weather statement, Jul 20, 2:04 PM CDT, 0 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:00 PM CDT	Areal Flood Advisory	BMX	St. Clair	3 hr
Jul 19, 7:01 PM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
Jul 19, 7:02 PM CDT	Areal Flood Advisory	BMX	Fayette	118 min
Jul 19, 7:34 PM CDT	Areal Flood Advisory	BMX	Greene	116 min
Jul 19, 7:53 PM CDT	Areal Flood Advisory	BMX	Walker	2 hr
Jul 19, 8:19 PM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Jul 20, 2:05 AM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Jul 20, 8:42 AM CDT	Flash Flood Watch	BMX	Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 8 more	12 hr
Jul 20, 12:14 PM CDT	Special Weather Statement	BMX	Pike	46 min
Jul 20, 1:10 PM CDT	Special Weather Statement	BMX	Autauga, Lowndes, Montgomery	50 min
Jul 20, 2:29 PM CDT	Areal Flood Advisory	BMX	Bibb, Jefferson, Shelby, Tuscaloosa	3 hr
Jul 20, 2:41 PM CDT	Areal Flood Advisory	BMX	Bibb, Chilton, Perry	3 hr
Jul 20, 2:48 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	3 hr
Jul 20, 3:34 PM CDT	Areal Flood Advisory	BMX	Shelby	3 hr
Jul 20, 3:41 PM CDT	Flash Flood Warning	BMX	Shelby	3 hr
Jul 20, 3:44 PM CDT	Areal Flood Advisory	BMX	Marion	2 hr
Jul 20, 4:00 PM CDT	Areal Flood Advisory	BMX	St. Clair, Shelby	3 hr
Jul 20, 4:06 PM CDT	Areal Flood Advisory	BMX	Walker, Winston	114 min
Jul 20, 4:22 PM CDT	Areal Flood Advisory	BMX	St. Clair	3 hr
Jul 20, 5:56 PM CDT	Areal Flood Advisory	BMX	Marion, Walker, Winston	2 hr
Jul 20, 6:03 PM CDT	Areal Flood Advisory	BMX	Blount	117 min

Nearby

Special Weather Statements in Alabama, 2021 Every special weather statement 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.