Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

April 10, 2021Dallas County, Alabama

NWS Birmingham, AL issued this special weather statement at Apr 10, 2021, 3:03 AM CDT for Dallas County, Alabama. It was in force for 57 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
Apr 10, 2021, 3:03 AM CDT (08:03 UTC)
Expired
Apr 10, 2021, 4:00 AM CDT
In force
57 min
Issued by
NWS Birmingham, AL

County Dallas County, AL

The radar

The Birmingham radar (KBMX), 116 km from the middle of the area, began a volume at 08:02 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, 8.1 hours before the alert went out and 116 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, Birmingham, AL at 00:00Z on 2021-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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, Birmingham, AL at 00:00Z on 2021-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 182 square meters per square second.193958Sfc1 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
53 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
744 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
182 m²/s²
0-3 km storm-relative helicity
294 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

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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 Apr 10, 1:23 AM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, Apr 10, 1:23 AM CDT, 1 hour 40 minutes before
Area Forecast Discussion
National Weather Service Birmingham AL
123 AM CDT Sat Apr 10 2021

.UPDATE...
For 06Z Aviation.

&&

.SHORT TERM...
/Updated at 0752 PM CDT Fri Apr 09 2021/

...Complex scenario unfolding for the late evening and overnight
period...

Initial wave(s) of convection across the BMX CWA today was quite
robust producing numerous instances of large to very large hail.
In fact, several reports of 2 inch plus hail were received. As of
0030z, most of this convection has been on the wane with a few
strong cells remaining across Pickens and Lamar county. The latest
mesoanalysis shows some remaining MLCAPE particularly across
western Alabama on the order of 750-1000 J/kg. However, a noted
low level stable layer has also developed with temps cooled into
the lower/mid 60s. The 00z sounding from KBMX supports this with a
roughly 1km stable layer below a relatively well mixed EML and
MUCAPE on the order of 1100 J/kg.

Our break here looks to be short lived with scattered convection
firing now in the pinched unstable airmass across Mississippi. This
area of convection is relatively unorganized at the moment, but is
likely the precursor of a more organized linear complex tonight. The
High Res CAMS continue to struggle with the timing/evolution of this
system (or systems)but current feeling is the southern sections of
the current MS convection will be favored and the leading edge of
what will eventually be an organized MCS/QLCS.

Based on the more favorable environment, expect the northern fringes
of this complex to have a hard time making much push but the
southern extent becoming well organized and racing along/south of I-
20 in MS and to near the US Highway 80 corridor...perhaps as early
as late evening/before midnight. This is where the moderate/enhanced
risk has been placed on our most recent update.

The parameter space would support a primary damaging wind event with
a strong unidirectional sheer profile and significant synoptic
forcing. There may be sufficient low level shear to support embedded
LEWPS and tornadic structures. Expect the line to clear our
southeast counties perhaps as early as sunrise but 14-15z at the
latest.

15/CBD

.LONG TERM...
/Updated at 0403 PM CDT Fri Apr 09 2021/

Primary adjustments to the long term forecast included a trend
towards lower PoPs and temperatures for Wednesday night through
the end of the week. Little to no changes were needed for the
first half of the period.

The same surface low set to produce strong storms tonight across the
Central Gulf States will settle over the Great Lakes and push a
secondary reinforcing front with showers and thunderstorms through
the area on Wednesday with a dry and cooler airmass following
closely behind. 12Z model guidance is in decent agreement on this
solution with better opportunities for rain across our southern
counties. Based on this trend, I slightly lowered PoPs and
temperatures for the end of the week with high pressure and
northerly flow becoming the primary driving factors in a less
active pattern for at least a few days next week. If the forecast
continues to trend in this direction, further adjustments will be
necessary.

86

Previous long-term discussion:
/Updated at 0338 AM CDT Fri Apr 09 2021/

Saturday night through Thursday.

Lingering thunderstorms are possible across the southeastern
counties late Saturday night through early Sunday morning as the
main frontal boundary finally pushes through Central AL. The low
pressure system itself is expected to lift northward into the Great
Lakes region, leading to height rises across the Deep South Sunday
through Monday. With the ridging developing in the lower levels, we
should remain rain-free. We transition to more of a quasi-zonal flow
aloft Monday afternoon through Thursday. However, this doesn't mean
we'll stay rain-free as model guidance picks up on at least two
quick shortwave impulses that slide across the southern half of the
CONUS Tuesday through Thursday. Each of these will increase
rain/thunderstorm chances for our area, though specific timings
remain uncertain this far in advance. Therefore, I've trended PoPs
up around mid-week, but will keep chances in the 40-50% range.

25/Owen

&&

.AVIATION...
06Z TAF Discussion.

A large area of tstms over west Alabama will continue to track
eastward thru the overnight hours. The leading edge of the
convection was near a KBHM-KMEI line at 06z. The activity
contained numerous cloud to ground lightning strikes along with
heavy rainfall. Once the rain begins at each airport, it will
likely last six hours. At this time, the any threat for severe
storms will be confined to KMGM and KTOI. Lower cigs have been
slow to develop due to drier air aloft that mixed downward during
the Friday afternoon storms. Once the rain has time to moisten air
mass, MVFR cigs will prevail. IFR cigs will likely develop across
the northern TAF sites between 09z and 15z. Outside the rain
areas thru 12z, MVFR cigs will also likely develop. LCl cigs The
leading edge of the tstms should be near a KANB-KMGM line by 11z
and KTOI by 14z. Rain with embedded tstms will linger up to 100
miles west of the leading edge. Conds will improve greatly after
18z with VFR conds at most sites.

58/rose

&&

.FIRE WEATHER...

Scattered showers and thunderstorms expected today across much of
the area. This could cause erratic gusty winds in locations
nearest to any thunderstorm development. More widespread rain and
thunderstorms move in overnight tonight into Saturday.

Drier/rain-free conditions are expected Sunday into Monday, with
afternoon RH values in the 30-40 percent range.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     75  48  74  47  81 / 100  30  10   0   0
Anniston    75  51  76  49  82 / 100  30  10   0   0
Birmingham  75  51  75  51  82 /  90  20  10   0   0
Tuscaloosa  76  49  76  50  82 /  80  20  10   0   0
Calera      75  51  75  51  81 / 100  20  10   0   0
Auburn      72  56  74  51  81 / 100  30  10   0   0
Montgomery  77  57  78  51  83 / 100  30  10   0   0
Troy        75  59  79  51  84 / 100  30  10   0   0

&&

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

&&
Hazardous weather outlook, Apr 9, 8:17 PM CDT, 6 hours 46 minutes before
Hazardous Weather Outlook
National Weather Service Birmingham AL
817 PM CDT Fri Apr 9 2021

ALZ011>015-017>050-110430-
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-
817 PM CDT Fri Apr 9 2021

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

.DAY ONE...Outlook through Tonight.

Severe storms may occur through the overnight hours. It is possible
that a few separate areas of severe storms develop during this time
frame. Damaging winds and large hail are possible, with an isolated
tornado threat for the southern half of the area. Locally heavy
rainfall may also cause minor flooding issues.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Severe storms will continue through Saturday morning. Damaging winds
and large hail are possible, along with an isolated tornado threat
for the south. Locally heavy rainfall may also cause minor flooding
issues.

Minor river flooding is expected along portions of the Tombigbee
River and Black Warrior River Saturday night through early next week.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management will likely be
needed through Saturday morning.

In the hours before

Special weather statement, Apr 9, 9:58 PM CDT, 5 hours 5 minutes before
Special Weather Statement
National Weather Service Birmingham AL
958 PM CDT Fri Apr 9 2021

ALZ012-013-100330-
Fayette AL-Lamar AL-
958 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN FAYETTE AND SOUTHERN
LAMAR COUNTIES UNTIL 1030 PM CDT...

At 958 PM CDT, Doppler radar was tracking a strong thunderstorm over
Caledonia, or 10 miles northeast of Columbus AFB, moving east at 45
mph.

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

Locations impacted include...
Fayette, Vernon, Millport, Kennedy, Belk, Blooming Grove, Bluff,
Cody, Star, Hightogy and Melborne.

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.

&&

LAT...LON 3357 8827 3379 8815 3384 8782 3353 8784
      3355 8827
TIME...MOT...LOC 0258Z 262DEG 40KT 3370 8828

25/Owen
Special weather statement, Apr 9, 10:36 PM CDT, 4 hours 27 minutes before
Special Weather Statement
National Weather Service Birmingham AL
1036 PM CDT Fri Apr 9 2021

ALZ022-100415-
Pickens AL-
1036 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR PICKENS COUNTY UNTIL 1115 PM
CDT...

At 1036 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Millport to 6 miles southwest of
Ethelsville to 6 miles southwest of Macon. Movement was east at 30
mph.

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

Locations impacted include...
Aliceville, Gordo, Reform, Carrollton, Pickensville, Ethelsville,
McMullen, Garden, Ashcraft Corner, Benevola, Johnston Lake, Bevill
Lock And Dam, Gainesville Lake Campground, Dillburg, North Pickens
Airport, McShan, Shaw, George Downer Airport, Owens and Kirk.

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 3341 8829 3353 8819 3353 8784 3323 8784
      3308 8797 3306 8804 3304 8804 3305 8807
      3303 8810 3304 8814 3300 8817 3299 8834
TIME...MOT...LOC 0336Z 270DEG 26KT 3355 8804 3336 8831 3303 8861

25/Owen
Special weather statement, Apr 9, 10:57 PM CDT, 4 hours 6 minutes before
Special Weather Statement
National Weather Service Birmingham AL
1057 PM CDT Fri Apr 9 2021

ALZ030-031-100500-
Greene AL-Sumter AL-
1057 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GREENE AND NORTHWESTERN
SUMTER COUNTIES UNTIL MIDNIGHT CDT...

At 1057 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cooksville, or 20 miles southwest of Aliceville, moving east at 45
mph.

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

Locations impacted include...
Eutaw, Union, Gainesville, New West Greene, Mantua, Panola, West
Greene, Knoxville, Geiger, Snoddy, Warsaw, New Mount Hebron, Clinton,
Pleasant Ridge, Lewiston and I 20 Rest Area Near Eutaw.

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 3299 8834 3300 8817 3304 8814 3303 8810
      3305 8807 3304 8804 3306 8804 3310 8795
      3312 8784 3302 8783 3302 8771 3299 8771
      3298 8775 3295 8775 3295 8773 3293 8777
      3290 8777 3290 8781 3284 8783 3282 8836
TIME...MOT...LOC 0357Z 262DEG 41KT 3291 8840

25/Owen
Special weather statement, Apr 10, 12:02 AM CDT, 3 hours 1 minute before
Special Weather Statement
National Weather Service Birmingham AL
1202 AM CDT Sat Apr 10 2021

ALZ030-031-100545-
Greene AL-Sumter AL-
1202 AM CDT Sat Apr 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GREENE AND SUMTER
COUNTIES UNTIL 1245 AM CDT...

At 1201 AM CDT, Doppler radar was tracking a strong thunderstorm over
Boyd, or 7 miles west of Livingston, moving east at 45 mph.

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

Locations impacted include...
Livingston, Eutaw, York, Cuba, Forkland, Boligee, Gainesville, Epes,
Emelle, Walden Quarters, The University Of West Alabama, Thornhill,
Dug Hill, Tishabee, Boyd, Allison, Duffys Bend, Bluffport, Coatopa
and Old Mallard Airport.

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.

&&

LAT...LON 3273 8837 3300 8771 3286 8783 3280 8782
      3276 8787 3275 8781 3271 8783 3272 8780
      3266 8779 3265 8774 3262 8781 3259 8774
      3258 8779 3252 8782 3254 8782 3252 8791
      3243 8804 3232 8841
TIME...MOT...LOC 0501Z 249DEG 38KT 3263 8831

25/Owen
Special weather statement, Apr 10, 2:01 AM CDT, 1 hour 2 minutes before
Special Weather Statement
National Weather Service Birmingham AL
201 AM CDT Sat Apr 10 2021

ALZ030-039-100800-
Sumter AL-Marengo AL-
201 AM CDT Sat Apr 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR MARENGO COUNTY UNTIL 300 AM
CDT...

At 200 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles north of Pennington to near Gilbertown.
Movement was east at 35 mph.

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

Locations impacted include...
Linden, Jefferson, Thomaston, Sweet Water, Myrtlewood, Dayton,
Putnam, Freddie Jones Field, Pin Hook, Nanafalia, Consul, Magnolia,
Wayne, Surginer, Miller, Chickasaw State Park, Dixons Mill, Vineland,
Half Acre and Carleys.

LAT...LON 3206 8812 3208 8804 3217 8801 3228 8802
      3231 8795 3228 8793 3231 8793 3240 8807
      3240 8752 3231 8752 3231 8747 3227 8747
      3225 8752 3213 8752 3213 8762 3200 8763
      3200 8811
TIME...MOT...LOC 0700Z 271DEG 28KT 3234 8809 3187 8825

25/Owen
Special weather statement, Apr 10, 3:03 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Birmingham AL
303 AM CDT Sat Apr 10 2021

ALZ033-039-040-100900-
Marengo AL-Dallas AL-Perry AL-
303 AM CDT Sat Apr 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MARENGO...SOUTHERN
PERRY AND DALLAS COUNTIES UNTIL 400 AM CDT...

At 303 AM CDT, Doppler radar was tracking a strong thunderstorm near
Consul, or 9 miles south of Uniontown, moving east at 45 mph.

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

Locations impacted include...
Selma, Uniontown, Selmont-West Selmont, Thomaston, Orrville,
Faunsdale, Dayton, Bogue Chitto, Vaiden, Consul, Central Mills, Old
Cahaba Park, Dannelly Reservoir, Dallas County Horse Arena, Belknap,
Dallas Lake, Memorial Stadium, Marion Junction, Potter Station and
Safford.

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 3212 8726 3214 8725 3215 8728 3220 8732
      3220 8736 3224 8739 3224 8741 3227 8745
      3227 8750 3225 8752 3213 8752 3213 8762
      3249 8776 3249 8773 3248 8772 3248 8752
      3252 8752 3257 8706 3213 8691
TIME...MOT...LOC 0803Z 257DEG 37KT 3231 8755

25/Owen

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:18 PM CDTSpecial Weather StatementBMXLamar27 min
Apr 9, 9:25 PM CDTSevere Thunderstorm WarningBMXLamar, Marion50 min
Apr 9, 9:58 PM CDTSpecial Weather StatementBMXLamar32 min
Apr 9, 10:36 PM CDTSpecial Weather StatementBMXPickens39 min
Apr 9, 10:57 PM CDTSpecial Weather StatementBMXGreene63 min
Apr 10, 12:02 AM CDTSpecial Weather StatementBMXGreene, Sumter43 min
Apr 10, 12:19 AM CDTAreal Flood AdvisoryBMXGreene3 hr
Apr 10, 1:43 AM CDTAreal Flood AdvisoryBMXGreene, Hale, Sumter3 hr
Apr 10, 2:01 AM CDTSpecial Weather StatementBMXMarengo59 min
Apr 10, 4:51 AM CDTSpecial Weather StatementBMXPike54 min

Nearby

Special Weather Statements in Alabama, 2021Every 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.