Severe Thunderstorm Warning 47, NWS Huntsville, AL

447 
WWUS54 KHUN 041504
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
1004 AM CDT Tue May 4 2021

ALC049-041515-
/O.CON.KHUN.SV.W.0047.000000T0000Z-210504T1515Z/
DeKalb AL-
1004 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT
FOR NORTHEASTERN DEKALB COUNTY...

At 1004 AM CDT, severe thunderstorms were located along a line
extending from near Ider to 10 miles northeast of Fort Payne to near
Little River Falls, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Fort Payne, Ider, Valley Head, Hammondville, Mentone, Sulpher Springs
and Desoto State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 PM CDT for northeastern
Alabama.

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

&&

LAT...LON 3448 8558 3444 8558 3452 8567 3473 8570
      3478 8557 3453 8551
TIME...MOT...LOC 1504Z 258DEG 28KT 3467 8560 3451 8556 3444 8563 

HAIL...<.75IN
WIND...60MPH
 
$$

05/MA

Area Forecast Discussion
National Weather Service Huntsville AL
559 AM CDT Tue May 4 2021

.UPDATE...
For 12Z TAFS.

&&

.NEAR TERM...(Today)
Issued at 232 AM CDT Tue May 4 2021

This morning, an ongoing storm complex in Arkansas is pushing into
Tennessee, as of this writing at 2 AM. Additionally, a secondary MCS
tracking through southwestern AR into TX is starting to merge with
the more severe line to the northeast. As a result, we expect a large
MCS to track trough the MS Valley into the Southeast this morning.
Timing the current line of storms has it approaching NW Alabama
around 5 AM, but southwesterly forward-propagating Corfidi vectors
and mean flow increase heading into the morning hours, so we expect
the most severe portion of the line to track northeast of the TN
Valley. A severe thunderstorm watch has been issued to our northwest,
and we do not expect expansion into our area. While we cannot rule
out a stray strong to severe storm this morning with this line,
forecast soundings indicate a capping inversion just above the
surface, keeping this line of storms elevated. A capping inversion
was observed in the 06z OHX sounding, and this is not expected to
erode this morning ahead of this first line of storms.

Behind this storm complex, a surface low pressure system and
attendant cold front approach the TN Valley from the Southern Plains.
We expect daytime heating to allow for surface-based convection in
the late morning, and ample instability for convection to capitalize
on. While there is still the potential for severe storms this
afternoon, an additional scenario is coming into play, which keeps
most severe convection at least south of the TN river, if not south
of the TN Valley altogether. The second line of storms this afternoon
and evening is mostly likely to be severe along and south of where
the morning line of storms decays and sets up a differential heating
boundary. With deterministic and ensemble guidance supporting a more
southerly track of the surface low, there is decreasing confidence
that the severe potential with the second line of storms will extend
northward into the TN Valley. This afternoon is a time to be
vigilant with mesoscale analysis to determine whether we will see
mostly rain with a few thunderstorms, or a severe line of storms
capable of widespread damaging winds, hail, and tornadoes. Heavy
rainfall will be a threat, regardless, and localized flash flooding
will be possible with multiple rounds of showers and storms.

.SHORT TERM...(Tonight through Thursday)
Issued at 232 AM CDT Tue May 4 2021

As the second line of storms pushes east of the TN Valley this
evening, lingering rainfall will be possible overnight. Additional
shower development is possible ahead of the approaching cold front,
but these are not expected to bloom into thunderstorms, much less
strong to severe convection. Increasing cold air advection will drop
overnight temperatures tonight near daily averages in the mid to
upper 50s. Surface high pressure over the Mid-Mississippi Valley and
zonal flow aloft will create a pleasant forecast for mid week, with
highs in the low 70s and mostly clear skies.

.LONG TERM...(Thursday night through Monday)
Issued at 232 AM CDT Tue May 4 2021

On Thursday night, a shortwave trough will push through the Ohio
Valley and sweep a weak cold front through the region. While isolated
showers are possible in TN, this is unlikely, so stayed with a dry
forecast for late this week. Reinforcing weak CAA will keep highs on
Friday in the upper 60s to low 70s, but then warm into the upper 70s
on Saturday. As this shortwave trough lifts into the Northeast,
zonal flow is reestablished. Several impulses traverse the zonal flow
late this weekend into early next week, bringing additional chances
for multiple rounds of showers and storms.

&&

.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 600 AM CDT Tue May 4 2021

Scattered to numerous showers and storms will overspread the region
with MVFR decks this morning ahead of an approaching line of storms.
Occasional gusts up to 30-40 kts are possible, and some of these
storms may be severe with hail, damaging winds, and heavy rainfall.
After a brief break late this morning into the early afternoon, a
second round of strong to severe storms will be possible. Today is a
day where many amendments and convective airport weather warnings
will be issued. Expect IFR or LIFR conditions in any thunderstorms.
Behind the second line of storms, IFR ceilings may develop late
tonight into early tomorrow morning. Showers may linger overnight,
but confidence was too low to include at this time.

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

NEAR TERM...30
SHORT TERM...30
LONG TERM...30
AVIATION...30

For more information please visit our website
at weather.gov/huntsville.

Hazardous Weather Outlook
National Weather Service Huntsville AL
341 AM CDT Tue May 4 2021

ALZ001>010-016-TNZ076-096-097-050000-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
341 AM CDT Tue May 4 2021

This Hazardous Weather Outlook is for north central Alabama,
northeast Alabama, northwest Alabama and southern middle Tennessee.

.DAY ONE...Today.
Two rounds of thunderstorms are expected today. The first will occur
this morning, with gusty winds and small hail the most likely
hazards. A severe thunderstorm with damaging wind or large hail
remains possible.

A greater risk of strong to severe thunderstorms exists this
afternoon into the evening hours. Large hail, damaging winds, and
heavy rainfall will be the greatest threats. A tornado or two is also
possible.

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

The probability for widespread hazardous weather is low.

A few thunderstorms are possible Sunday into Monday.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible, especially this afternoon and evening.

Please relay any information about observed severe weather to the
NWS while following all local, state, and CDC guidelines.

Special Weather Statement
National Weather Service Huntsville AL
803 AM CDT Tue May 4 2021

TNZ097-041345-
Franklin TN-
803 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN FRANKLIN COUNTY UNTIL
845 AM CDT...

At 803 AM CDT, Doppler radar was tracking a strong thunderstorm near
Lynchburg, moving east at 45 mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Winchester, Decherd, Estill Springs, Cowan, Tims Ford Lake, Sewanee,
Lexie Crossroads, Woods Reservoir, Harmony and Arnold AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3534 8603 3531 8600 3528 8591 3522 8586
      3516 8587 3512 8632 3521 8629 3522 8631
      3524 8628 3532 8624 3534 8626 3535 8624
      3535 8622 3533 8620 3536 8616
TIME...MOT...LOC 1303Z 260DEG 38KT 3522 8633

05/MA

Special Weather Statement
National Weather Service Huntsville AL
831 AM CDT Tue May 4 2021

ALZ004>008-016-041415-
Marshall AL-Lawrence AL-Madison AL-Morgan AL-Limestone AL-Cullman AL-
831 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MARSHALL...WESTERN
MADISON...LIMESTONE...NORTHERN CULLMAN...MORGAN AND EASTERN LAWRENCE
COUNTIES UNTIL 915 AM CDT...

At 830 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles east of Courtland to 6 miles southwest
of Trinity to near Hartselle to 6 miles southwest of Falkville.
Movement was east at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Huntsville, Decatur, Madison, Athens, Hartselle, Guntersville, Arab,
Meridianville, Redstone Arsenal and Moores Mill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3420 8710 3439 8713 3457 8731 3479 8723
      3499 8652 3468 8654 3460 8641 3429 8632
TIME...MOT...LOC 1330Z 252DEG 31KT 3471 8714 3453 8716 3445 8702 3429
8698

05/MA

Special Weather Statement
National Weather Service Huntsville AL
901 AM CDT Tue May 4 2021

ALZ006-009-TNZ097-041445-
Madison AL-Jackson AL-Franklin TN-
901 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN JACKSON...EASTERN
MADISON AND SOUTH CENTRAL FRANKLIN COUNTIES UNTIL 945 AM CDT...

At 901 AM CDT, Doppler radar was tracking a strong thunderstorm near
Woodville, or 12 miles west of Scottsboro, moving northeast at 40
mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Scottsboro, Bridgeport, Stevenson, Hollywood, Skyline, Woodville,
Pleasant Groves, Hytop, Bass and Lim Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3493 8560 3460 8625 3475 8638 3500 8619
      3499 8586 3499 8564 3494 8560
TIME...MOT...LOC 1401Z 234DEG 37KT 3472 8624

05/MA

Special Weather Statement
National Weather Service Huntsville AL
923 AM CDT Tue May 4 2021

ALZ008-010-041515-
Marshall AL-DeKalb AL-
923 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MARSHALL AND DEKALB
COUNTIES UNTIL 1015 AM CDT...

At 923 AM CDT, Doppler radar was tracking a strong thunderstorm over
Boaz, moving northeast at 45 mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Albertville, Fort Payne, Boaz, Rainsville, Henagar, Crossville,
Sylvania, Fyffe, Powell and Geraldine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3437 8563 3420 8600 3420 8611 3419 8611
      3418 8619 3414 8624 3425 8633 3464 8570
      3447 8558 3444 8558
TIME...MOT...LOC 1423Z 237DEG 37KT 3422 8620

05/MA

Special Weather Statement
National Weather Service Huntsville AL
925 AM CDT Tue May 4 2021

ALZ004-006-007-016-041515-
Lawrence AL-Madison AL-Morgan AL-Cullman AL-
925 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MADISON...CULLMAN...
SOUTHERN MORGAN AND SOUTHEASTERN LAWRENCE COUNTIES UNTIL 1015 AM
CDT...

At 925 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Sardis to near Inmanfield to Houston
Recreational Area to near Poplar Springs. Movement was east at 45
mph.

Pea size hail and wind gusts up to 50 mph will be possible with these
storms.

Locations impacted include...
Cullman, Hartselle, Hanceville, Good Hope, Falkville, Holly Pond,
Dodge City, Morgan City, Baldwin and Vinemont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3430 8711 3430 8717 3445 8708 3452 8633
      3451 8634 3450 8640 3448 8643 3449 8656
      3431 8658 3430 8653 3422 8654 3420 8655
      3419 8655 3412 8660 3412 8663 3409 8666
      3403 8711
TIME...MOT...LOC 1425Z 255DEG 37KT 3430 8709 3423 8724 3416 8737 3407
8738

05/MA

Special Weather Statement
National Weather Service Huntsville AL
938 AM CDT Tue May 4 2021

ALZ009-010-041530-
DeKalb AL-Jackson AL-
938 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JACKSON AND
NORTHEASTERN DEKALB COUNTIES UNTIL 1030 AM CDT...

At 938 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bridgeport to 7 miles southeast of
Stevenson to near Henagar. Movement was northeast at 35 mph.

Wind gusts of 50 to 55 mph will be possible with these storms.

Locations impacted include...
Bridgeport, Henagar, Stevenson, Ider, Rosalie, Long Island, Russell
Cave National Monument, Fabius, Sulpher Springs and Higdon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong gusty winds will be capable of knocking down small tree limbs
along with other small unsecured items. Seek safe shelter until this
line of storms has passed.

Very heavy 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 several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

&&

LAT...LON 3458 8582 3479 8578 3499 8585 3499 8561
      3465 8554
TIME...MOT...LOC 1438Z 241DEG 29KT 3496 8577 3482 8572 3461 8579

05/MA