Special Weather Statement, NWS Birmingham, AL

Area Forecast Discussion
National Weather Service Birmingham AL
659 PM CDT Mon Jul 3 2017

.UPDATE...
Evening Update and 00Z Aviation.

&&

.SHORT TERM...

Currently advertising chance pops the entire overnight period.
There are several boundaries across north central Alabama and
additional boundaries will move in from the north and west. This
was all associated with convection and an MCV near the western
Tennessee and Kentucky state line. Therefore, will keep the
overnight pops as is and monitor for any persistent develop along
any of these boundaries this evening.

75

Previous short-term discussion:
Showers and storms have developed today, on the southern side of a
MCV rotating from Arkansas into Missouri and Tennessee. This
activity has been confined to northwest Central Alabama, as weak
ridging and warm temps aloft have prevented activity across
southern areas. Outflow boundaries could keep storms going
overnight, given the proximity of the MCV, but coverage will
decrease, and is expected to be primarily across north Central
Alabama.

14

.LONG TERM...
Tuesday through Sunday.

A well-defined mid-level MCV associated with latent heat release
from the current MCS over Arkansas is forecast to move only slowly
eastward today and tonight. It will be located over central KY/TN
by Tuesday, with some reflection down into the low-level wind
fields. An east-west moisture axis and area of enhanced westerlies
will be located south of this feature, possibly along an outflow
boundary, with showers/storms possibly ongoing Tuesday morning.
High-res guidance indicates this will be along the Highway 278
corridor with the GFS/ECMWF being closer to I-20. Will lean
towards the high-res guidance with highest rain chances along the
Highway 278 corridor, tapering off further south, while leaving a
buffer for uncertainty. There will likely be a sharp gradient on
the southern end of the area of showers/storms. Further south, dry
air and subsidence due the Gulf Coast ridge should largely
suppress development, as well as offshore flow. High res guidance
actually does not indicate any convection south of I-20. So
overall PoPs have been trended downward except in the far north
for the 4th. Highs may reach the mid 90s across the south, but dew
points should mix down enough to keep heat indices below heat
advisory criteria. With dry air moving in and subsidence behind
the MCV, any convection should mainly dissipate by sunset except
perhaps in far northeast AL.

For Wednesday, forcing for convection will be limited to remnant
boundaries and daytime heating due to ridging and anticyclonic
flow aloft ahead of a shortwave moving into the Ozarks. This will
keep rain chances isolated to scattered at most. Rain chances
should increase on Thursday/Thursday night as moisture and lift
increases due to a shortwave moving through KY/TN. The latest
ECMWF is a bit more compact with this wave resulting in less
forcing this far south while the GFS is more elongated with more
forcing over Central Alabama. Models have also trended towards
less in the way of a wind shift/low-level convergence. All in all,
will keep PoPs in the chance/scattered category. The moisture axis
will continue to be located over the forecast area on Friday.

A cold front will move in this weekend as a trough digs over the
eastern US in response to the strengthening anticyclone/ridge over
the western US. The front will likely stall somewhere in the
vicinity of Central Alabama with enhanced rain chances along and
south of the front and drier air moving in behind the front.

32/Davis

&&

.AVIATION...
00Z TAF Discussion.

Drier air over the southern half of Alabama this evening has
limited convection and cloud cover. This terminal forecast
advertises mainly VFR conditions. Several small scale boundaries
are near some the northern terminals this evening and have added a
VC mention for an hour or so. Overall moisture levels increase
overnight north and it may also become nearly saturated near
ground level. Went ahead and added a tempo for MVFR BR in the few
hours around daybreak.

At this time, did not mention any ceilings or thunder for the 4th
of July. A slow moving MCV near the western Tennessee and Kentucky
state line will sent several boundaries our way overnight and
something should be leftover near the northern sites tomorrow.
Will monitor this axis as we may have to introduce some TS
tomorrow. Also, there is a small chance of thunderstorms overnight
and may have to add mention if these boundaries continua to
initiate activity.

75

&&

.FIRE WEATHER...

The best chances of showers and thunderstorms will be over
northern portions of Central Alabama today and tomorrow, with
humid conditions continuing. There are no fire weather concerns.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     70  88  70  90  71 /  30  40  30  30  30
Anniston    70  89  70  90  72 /  30  40  30  30  30
Birmingham  71  90  72  91  73 /  30  40  10  30  30
Tuscaloosa  72  93  72  93  73 /  20  40  10  20  20
Calera      72  91  72  92  73 /  20  30  10  30  20
Auburn      72  91  71  90  73 /  10  10  10  30  30
Montgomery  73  95  72  94  74 /  10  10  10  20  20
Troy        73  94  70  93  74 /  10  10  10  30  30

&&

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

&&

Hazardous Weather Outlook
National Weather Service Birmingham AL
441 AM CDT Mon Jul 3 2017

ALZ011>015-017>050-041245-
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-
441 AM CDT Mon Jul 3 2017

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

.DAY ONE...Outlook through Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management is not
expected at this time.

Special Weather Statement
National Weather Service Birmingham AL
445 PM CDT MON JUL 3 2017

ALZ018-020-032245-
Etowah AL-Cherokee AL-
445 PM CDT MON JUL 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ETOWAH AND CHEROKEE
COUNTIES UNTIL 545 PM CDT...

At 444 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Pisgah to near Sardis City. Movement was
east at 25 mph.

Winds in excess of 40 mph will be possible with these storms. Gusty
winds will also occur ahead of the arrival of rain.

Locations impacted include...
Gadsden, Hokes Bluff, Centre, Cedar Bluff, Little River Canyon
National Preserve, Forney, Centre Municipal Airport, Sardis City,
Leesburg, Reece City, Sand Rock, Gaylesville, Tennala, Tabor Road,
Cherokee Rock Village, Pleasant Gap, Cornwall Furnace Park, Blanche,
Little River Falls and Ballplay.

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 3397 8540 3394 8553 3396 8554 3398 8586
      3408 8610 3417 8620 3418 8619 3419 8611
      3420 8610 3420 8584 3424 8584 3424 8581
      3426 8581 3426 8577 3436 8566 3437 8563
      3440 8563 3444 8558 3449 8557 3453 8552
TIME...MOT...LOC 2144Z 290DEG 24KT 3469 8580 3418 8608

89^GSatterwhite

Special Weather Statement
National Weather Service Birmingham AL
539 PM CDT MON JUL 3 2017

ALZ018>021-032315-
Calhoun AL-Etowah AL-Cleburne AL-Cherokee AL-
539 PM CDT MON JUL 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CALHOUN...
SOUTHEASTERN ETOWAH...NORTHEASTERN CLEBURNE AND CHEROKEE COUNTIES
UNTIL 615 PM CDT...

At 538 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles southeast of Gaylesville to near Moshat
to Glencoe. Movement was east at 35 mph.

Wind gusts up to 50 mph will be possible with these storms. These
storms have knocked some trees and power lines down back to the
west. If you are outside, take cover until the storm passes.

Locations impacted include...
Gadsden, Rainbow City, Piedmont, Hokes Bluff, Centre, Cedar Bluff,
Forney, Centre Municipal Airport, Glencoe, Gaylesville, Tennala,
Pleasant Gap, Cornwall Furnace Park, Weiss Lake, Moshat, Ball Flat,
Southside, Coloma, Spring Garden and Cobb City.

LAT...LON 3448 8550 3388 8538 3381 8566 3395 8609
      3408 8570 3448 8551
TIME...MOT...LOC 2238Z 289DEG 30KT 3421 8547 3404 8560 3394 8592

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Special Weather Statement
National Weather Service Birmingham AL
638 PM CDT MON JUL 3 2017

ALZ011-040015-
Marion-
638 PM CDT MON JUL 3 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MARION COUNTY...

At 637 PM CDT, a strong thunderstorm was located near Brilliant, or 7
miles north of Winfield, moving east at 20 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Hamilton, Winfield, Haleyville, Guin, Brilliant, Glen Allen, Gu-
Win, Brinn, Lake Buttahatchee, Bear Creek, Twin, Tucker, Pearces
Mill, Texas and Piney Grove.

LAT...LON 3428 8764 3392 8764 3396 8795 3410 8794
TIME...MOT...LOC 2337Z 277DEG 15KT 3403 8783

61

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Special Weather Statement
National Weather Service Birmingham AL
759 PM CDT MON JUL 3 2017

ALZ013>015-040145-
Fayette AL-Walker AL-Winston AL-
759 PM CDT MON JUL 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR WALKER...SOUTHEASTERN WINSTON AND
NORTHEASTERN FAYETTE COUNTIES UNTIL 845 PM CDT...

At 759 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Helicon to near Smith Dam to near Carbon
Hill. Movement was east at 25 mph.

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

Locations impacted include...
Jasper, Sumiton, Cordova, Dora, Carbon Hill, Arley, Parrish, Oakman,
Addison, Sipsey, Kansas, Nauvoo, Curry, Gorgas Steam Plant, Smith
Dam, Nesmith, Lake Shore, Poplar Springs, Helicon and Gorgas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3399 8711 3399 8715 3397 8714 3393 8709
      3389 8709 3389 8701 3387 8700 3384 8695
      3380 8695 3377 8702 3369 8704 3368 8706
      3366 8706 3366 8709 3363 8710 3362 8715
      3380 8775 3406 8742 3423 8716 3423 8711
TIME...MOT...LOC 0059Z 278DEG 24KT 3413 8706 3394 8714 3384 8748

75