Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 107, NWS Birmingham, AL

April 23, 2020Lowndes County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 23, 2020, 6:33 AM CDT for Lowndes County, Alabama. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 23, 2020, 6:33 AM CDT (11:33 UTC)
Expired: Apr 23, 2020, 7:02 AM CDT
In force: 29 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Lowndes County, AL

The radar

The Maxwell AFB radar (KMXX), 91 km from the middle of the area, began a volume at 11:37 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 00:00Z, 11.6 hours before the alert went out and 115 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2347 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 379 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 severe thunderstorm warning 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 severe thunderstorm warning went out at Apr 23, 6:32 AM CDT, 1 minute earlier.

Area forecast discussion, Apr 23, 6:32 AM CDT, 1 minute 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, Apr 23, 4:00 AM CDT, 2 hours 33 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
400 AM CDT Thu Apr 23 2020

ALZ011>015-017>050-241200-
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-
400 AM CDT Thu Apr 23 2020

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

.DAY ONE...Outlook through Tonight.

There is a chance of severe storms this morning through 10 AM CDT,
mainly south of a line from Demopolis to Auburn. Additional severe
storms are possible this afternoon, mainly along and south of I-20.
Damaging winds, large hail, and tornadoes are possible. Winds
outside of storms could gust to near 35 mph this morning.

Heavy rain and localized flash flooding will also be possible,
especially south and west of a Tuscaloosa to Montgomery line.

Minor river flooding will continue across the southern half of
Central Alabama. Please see flood statements for specific details.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Minor to moderate river flooding will continue through the week.
Please see flood statements for specific details.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
today. Please follow all local, state, and CDC guidelines in regards
to travel.

In the hours before

Special weather statement, Apr 23, 1:45 AM CDT, 4 hours 48 minutes before

Special Weather Statement
National Weather Service Birmingham AL
145 AM CDT Thu Apr 23 2020

ALZ023-030>032-230730-
Greene AL-Hale AL-Sumter AL-Tuscaloosa AL-
145 AM CDT Thu Apr 23 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN TUSCALOOSA...
GREENE...NORTHERN HALE AND CENTRAL SUMTER COUNTIES UNTIL 230 AM
CDT...

At 145 AM CDT, Doppler radar was tracking a strong thunderstorm near
Boligee, or 12 miles northeast of Livingston, moving northeast at 45
mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Eutaw, Moundville, Forkland, Akron, Boligee, Union, Gainesville,
Epes, Walden Quarters, West Greene, Thornhill, Wedgeworth, Mantua,
Allison, Jena, Sawyerville, Knoxville, Evansville, Snoddy and Ralph.

LAT...LON 3307 8800 3312 8793 3315 8784 3317 8783
      3304 8737 3301 8739 3300 8742 3297 8742
      3262 8790 3271 8828
TIME...MOT...LOC 0645Z 232DEG 41KT 3275 8808

86/Martin

Special weather statement, Apr 23, 3:27 AM CDT, 3 hours 6 minutes before

Special Weather Statement
National Weather Service Birmingham AL
327 AM CDT Thu Apr 23 2020

ALZ030-230915-
Sumter AL-
327 AM CDT Thu Apr 23 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SUMTER COUNTY UNTIL 415
AM CDT...

At 324 AM CDT, Doppler radar was tracking a strong thunderstorm near
Zero, or near Meridian, moving east at 60 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Livingston, York, Cuba, Coatopa, Dug Hill, Kinterbish, Old Mallard
Airport, Belmont, Demopolis Lock And Dam, Lilita, McDowell, Bellamy,
I 20 Welcome Center At Cuba, Ward and Whitfield.

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Birmingham.

&&

LAT...LON 3252 8839 3263 8791 3262 8791 3262 8789
      3259 8790 3258 8788 3254 8787 3252 8784
      3252 8791 3246 8796 3244 8803 3242 8804
      3238 8804 3237 8802 3234 8799 3235 8797
      3231 8794 3231 8842
TIME...MOT...LOC 0824Z 262DEG 51KT 3235 8863

40/Sizemore

Special weather statement, Apr 23, 4:38 AM CDT, 1 hour 55 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>

Special weather statement, Apr 23, 5:24 AM CDT, 1 hour 9 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>

Local storm report, Apr 23, 5:57 AM CDT, 36 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>

Special weather statement, Apr 23, 6:18 AM CDT, 15 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
Apr 22, 10:23 PM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	14 hr
Apr 23, 1:45 AM CDT	Special Weather Statement	BMX	Greene	45 min
Apr 23, 3:27 AM CDT	Special Weather Statement	BMX	Sumter	48 min
Apr 23, 4:38 AM CDT	Special Weather Statement	BMX	Hale, Perry	52 min
Apr 23, 5:12 AM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby, Tuscaloosa	3 hr
Apr 23, 5:24 AM CDT	Special Weather Statement	BMX	Chilton, Coosa, Shelby, Talladega	51 min
Apr 23, 6:18 AM CDT	Special Weather Statement	BMX	Lowndes	42 min
Apr 23, 7:01 AM CDT	Special Weather Statement	BMX	Montgomery	44 min
Apr 23, 8:01 AM CDT	Special Weather Statement	BMX	Barbour, Pike	44 min
Apr 23, 9:14 AM CDT	Special Weather Statement	BMX	Barbour	46 min
Apr 23, 1:58 PM CDT	Severe Thunderstorm Warning	BMX	Sumter	47 min
Apr 23, 2:22 PM CDT	Severe Thunderstorm Warning	BMX	Greene	38 min
Apr 23, 2:47 PM CDT	Severe Thunderstorm Warning	BMX	Hale	43 min
Apr 23, 3:06 PM CDT	Special Weather Statement	BMX	Dallas	39 min
Apr 23, 3:20 PM CDT	Special Weather Statement	BMX	Bibb	40 min
Apr 23, 3:39 PM CDT	Severe Thunderstorm Warning	BMX	Bibb	32 min
Apr 23, 3:41 PM CDT	Severe Thunderstorm Warning	BMX	Marengo, Sumter	49 min
Apr 23, 3:53 PM CDT	Severe Thunderstorm Warning	BMX	Chilton	51 min
Apr 23, 4:06 PM CDT	Special Weather Statement	BMX	Hale, Perry	54 min
Apr 23, 4:17 PM CDT	Severe Thunderstorm Warning	BMX	Hale, Perry	32 min
Apr 23, 4:29 PM CDT	Special Weather Statement	BMX	Marengo	46 min
Apr 23, 4:34 PM CDT	Special Weather Statement	BMX	Coosa	41 min
Apr 23, 4:47 PM CDT	Special Weather Statement	BMX	Marengo	43 min
Apr 23, 4:54 PM CDT	Special Weather Statement	BMX	Chilton	36 min
Apr 23, 4:59 PM CDT	Special Weather Statement	BMX	Chilton	46 min
Apr 23, 5:14 PM CDT	Special Weather Statement	BMX	Chilton, Coosa	46 min
Apr 23, 5:29 PM CDT	Special Weather Statement	BMX	Tallapoosa	46 min
Apr 23, 5:34 PM CDT	Areal Flood Advisory	BMX	Coosa, Tallapoosa	3 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2020 Every severe thunderstorm warning in 2020

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.