Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 112, NWS Birmingham, AL

April 23, 2020Marengo County, Sumter County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 23, 2020, 3:41 PM CDT for Marengo County, Sumter County, Alabama. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 23, 2020, 3:41 PM CDT (20:41 UTC)
Expired: Apr 23, 2020, 4:30 PM CDT
In force: 49 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Marengo County, AL, Sumter County, AL

The radar

The Birmingham radar (KBMX), 142 km from the middle of the area, began a volume at 20:42 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.

What was reported inside it

Time	Report	Where	Remark
Apr 23, 4:17 PM CDT	TSTM WND DMG	1 Sw Providence, AL	NUMEROUS TREES DOWN BETWEEN LINDEN AND PROVIDENCE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 36 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.7 hours before the alert went out and 202 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: 1085 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 625 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

As transmitted.

636 
WUUS54 KBMX 232041
SVRBMX
ALC091-119-232130-
/O.NEW.KBMX.SV.W.0112.200423T2041Z-200423T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
341 PM CDT Thu Apr 23 2020

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Northern Marengo County in southwestern Alabama...
  Southeastern Sumter County in west central Alabama...

* Until 430 PM CDT.

* At 341 PM CDT, a severe thunderstorm was located 7 miles east of
  Kinterbish, or 15 miles southeast of York, moving east at 55 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Demopolis, Linden, Jefferson, Myrtlewood, Faunsdale, Dayton, Pin
  Hook, Chickasaw State Park, U.S. 80 and AL 28, Whitfield, Old
  Spring Hill and Demopolis Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3240 8824 3252 8773 3248 8772 3248 8753
      3230 8752 3225 8801 3227 8802 3228 8802
      3230 8798 3230 8794 3228 8794 3229 8793
      3231 8793 3231 8824
TIME...MOT...LOC 2041Z 258DEG 47KT 3231 8816 

HAIL...1.00IN
WIND...60MPH
 
$$

89^GSatterwhite

2 follow-up statements

361 
WWUS54 KBMX 232054
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
354 PM CDT Thu Apr 23 2020

ALC091-119-232130-
/O.CON.KBMX.SV.W.0112.000000T0000Z-200423T2130Z/
Marengo AL-Sumter AL-
354 PM CDT Thu Apr 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR NORTHERN MARENGO AND SOUTH CENTRAL SUMTER COUNTIES...

At 354 PM CDT, severe thunderstorms were located along a line
extending from 7 miles northwest of Myrtlewood to near Lisman, moving
east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Demopolis, Linden, Jefferson, Myrtlewood, Faunsdale, Dayton, Pin
Hook, Chickasaw State Park, Whitfield and Old Spring Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3238 8824 3250 8773 3250 8772 3248 8772
      3248 8753 3230 8752 3225 8801 3227 8802
      3228 8802 3230 8798 3230 8794 3228 8794
      3229 8793 3231 8793 3231 8824
TIME...MOT...LOC 2054Z 261DEG 33KT 3231 8804 3221 8831 

HAIL...1.00IN
WIND...60MPH
 
$$

89^GSatterwhite

104 
WWUS54 KBMX 232120
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
420 PM CDT Thu Apr 23 2020

ALC119-232130-
/O.CAN.KBMX.SV.W.0112.000000T0000Z-200423T2130Z/
Sumter AL-
420 PM CDT Thu Apr 23 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SUMTER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
central and southwestern Alabama.

LAT...LON 3227 8786 3239 8790 3248 8771 3248 8753
      3240 8753 3230 8752 3228 8776
TIME...MOT...LOC 2120Z 255DEG 30KT 3235 8780 

$$

ALC091-232130-
/O.CON.KBMX.SV.W.0112.000000T0000Z-200423T2130Z/
Marengo AL-
420 PM CDT Thu Apr 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR NORTHEASTERN MARENGO COUNTY...

At 420 PM CDT, a severe thunderstorm was located over Chickasaw State
Park, or over Linden, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Linden, Jefferson, Faunsdale, Dayton, Pin Hook, Chickasaw State Park
and Old Spring Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3227 8786 3239 8790 3248 8771 3248 8753
      3240 8753 3230 8752 3228 8776
TIME...MOT...LOC 2120Z 255DEG 30KT 3235 8780 

HAIL...1.00IN
WIND...60MPH
 
$$

89^GSatterwhite

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, 3:20 PM CDT, 21 minutes earlier.

Area forecast discussion, Apr 23, 3:20 PM CDT, 21 minutes before

Area Forecast Discussion
National Weather Service Birmingham AL
320 PM CDT Thu Apr 23 2020

.SHORT TERM...

Through tonight.

Last batch of convection associated with the current system is
forecast to push across central Alabama the rest of this afternoon
into this evening. SPC mesoanalysis shows a nose of instability
(MLCAPEs up to 1500 J/kg) into the western sections of the CWA at
2000 UTC, just ahead of the advancing surface cold front. Not
surprisingly, band of convection has managed to fire up within
this instability nose, and will need to be watched during the rest
of the afternoon. Fortunately, low level pressure gradient has
been weaker than previous couple severe-producing weather systems.
The resultant weaker advection of the warm sector should limit
further destabilization once we lose the heating of the day.
Therefore, we anticipate a decreasing trend in storm strength
after that time. Models depict all rain should move east of our
area at some point overnight, and we should have rain free
conditions by 12z Friday.

/61/

.LONG TERM...

Friday through Thursday.

The rather progressive weather pattern will bring another chance
of rain and thunderstorms into the northern part of the area
Friday night into Saturday. Given the timing of this system, and
the rather quick turnaround after the current system, it still
appears that instability/shear parameters are (collectively)
insufficient for severe weather.

Dry weather returns on Sunday, which will last through at least
Monday. Yet another upper level shortwave trough will bring more
rain chances into area late Tuesday into Wednesday. As per usual,
there's quite a bit of model spread on the details associated with
this system.

/61/

&&

.AVIATION...
18Z TAF Discussion.

The morning large thunderstorm complex has exited the area to the
east/southeast. In its wake, additional showers and thunderstorms
are trying to develop. It appears that any re-development that
does occur will not be nearly as widespread as the morning
convection. Cold frontal passage this evening will be marked by a
wind shift to a more southwesterly and westerly direction, and
decrease in both ceiling heights and (ultimately) cloud coverage.
Some models do suggest some light fog or lowered ceilings coming
back into the south or east counties overnight.

/61/

&&

.FIRE WEATHER...

Heavy rain and thunderstorms will be possible through this
afternoon, with lighter rain tonight. Dry conditions return for
Friday, but rain chances will return to start the weekend as a
quick moving front slides across the north. Dry conditions and sub
35 percent RH will return for the first of the week. Another
strong storm system is expected Tuesday night through Wednesday
with more heavy rains and thunderstorms.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     54  75  54  75  48 /  50   0  20  40  10
Anniston    55  76  55  76  49 /  50   0  20  30  10
Birmingham  55  77  58  76  51 /  50   0  30  30  10
Tuscaloosa  54  78  59  78  51 /  40   0  30  20   0
Calera      54  76  58  77  51 /  50   0  20  20  10
Auburn      56  76  56  78  52 /  50   0   0  10  10
Montgomery  57  79  58  81  54 /  40   0   0  10  10
Troy        59  80  59  83  56 /  40   0   0  10  10

&&

.BMX WATCHES/WARNINGS/ADVISORIES/...
None.

&&

Hazardous weather outlook, Apr 23, 4:00 AM CDT, 11 hours 41 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

Local storm report, Apr 23, 2:50 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
250 PM CDT THU APR 23 2020

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

0234 PM     HAIL             4 NW EPES               32.74N 88.17W
04/23/2020  E0.70 INCH       SUMTER             AL   PUBLIC

&&

Special weather statement, Apr 23, 3:06 PM CDT, 35 minutes before

Special Weather Statement
National Weather Service Birmingham AL
306 PM CDT Thu Apr 23 2020

ALZ040-232045-
Dallas AL-
306 PM CDT Thu Apr 23 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DALLAS COUNTY UNTIL
345 PM CDT...

At 306 PM CDT, Doppler radar was tracking a strong thunderstorm near
Orrville, or 15 miles southwest of Selmont-West Selmont, moving
northeast at 45 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Selma, Selmont-West Selmont, Orrville, Gardner Island, Tyler, Old
Cahaba Park, Memorial Stadium, Burnsville, Dallas County Horse Arena,
Dannelly Reservoir, Skyharbor Airport, Whites Bluff, Craig Field
Aiport, Selma Drag Strip, Edmund Pettus Bridge and Crumptonia.

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 3227 8731 3249 8688 3247 8688 3246 8686
      3244 8687 3243 8683 3242 8685 3241 8685
      3236 8681 3234 8681 3233 8685 3231 8685
      3230 8683 3227 8687 3218 8728
TIME...MOT...LOC 2006Z 245DEG 38KT 3224 8721

32/Davis

Special weather statement, Apr 23, 3:20 PM CDT, 21 minutes before

Special Weather Statement
National Weather Service Birmingham AL
320 PM CDT Thu Apr 23 2020

ALZ033-034-232100-
Bibb AL-Perry AL-
320 PM CDT Thu Apr 23 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN PERRY AND SOUTHERN BIBB
COUNTIES UNTIL 400 PM CDT...

At 319 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Mertz, or 11 miles northeast of Greensboro, moving
east at 45 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Brent, Centreville, Lawley, Talladega National Forest, West
Centreville, Mertz, Trio, Ellards, Bibb County Airport and Six Mile.

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 3283 8742 3293 8742 3301 8699 3284 8688
      3284 8702 3281 8702 3275 8747 3283 8747
TIME...MOT...LOC 2019Z 257DEG 39KT 3283 8747

32/Davis

Local storm report, Apr 23, 3:21 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
321 PM CDT THU APR 23 2020

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

0207 PM     HAIL             2 SSW EMELLE            32.70N 88.33W
04/23/2020  E1.00 INCH       SUMTER             AL   FIRE DEPT/RESCUE

            CORRECTION TO PREVIOUS 1 INCH HAIL REPORT TO
            LOCATION OF EVENT VS. LOCATION AT TIME OF
            CALL.

&&

Local storm report, Apr 23, 3:31 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
331 PM CDT THU APR 23 2020

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

0144 PM     HAIL             3 W WALDEN QUARTERS     32.74N 87.91W
04/23/2020  E0.25 INCH       GREENE             AL   EMERGENCY MNGR

&&

Local storm report, Apr 23, 3:35 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
335 PM CDT THU APR 23 2020

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

0235 PM     TSTM WND DMG     2 N TISHABEE            32.66N 88.00W
04/23/2020                   GREENE             AL   EMERGENCY MNGR

            TREE DOWN REPORTED AT CR50/CR72.

&&

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, 6:33 AM CDT	Severe Thunderstorm Warning	BMX	Lowndes	29 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, 3:53 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.