Special Weather Statement, NWS Birmingham, AL

Area Forecast Discussion
National Weather Service Birmingham AL
654 PM CDT Sat Jun 9 2018

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

&&

.SHORT TERM...

Increased rain chances early this evening along axis from just west
of Selma, to east of Tuscaloosa, to the western BHM metro, to
Oneonta. A rather substantial outflow boundary has set up in the
vicinity of this axis. It also is collocated near the wet/dry
interface. Therefore, thunderstorms may develop along this axis
for a few hours before slowly diminishing. Due to the numerous
boundaries and instability this afternoon, left mention of some
activity until 1 am. A strong wind gust is possible with this
activity.

Otherwise, changes based on where rain fell. There will most
likely be some patchy fog overnight, but visibilities will remain
greater than 3 miles in most spots.

75

Previous short-term discussion:Through Tonight.

Afternoon convection has been confined to areas mainly south of
I-20, with more organized storms along and south of I-85 where
deeper moisture is present. Highest base velocity winds off radars
have been in the 20-30 mph range, but likely some wind gusts to 40
mph in a few places. Activity will diminish through the early
evening hours with loss of daytime heating, with rain free
conditions for most areas by 9 or 10 pm.

58/rose

.LONG TERM...
Sunday through Friday.

Central Alabama will remain in a typical weak flow summertime
pattern for much of the forecast period, within an overall
weakness in the subtropical ridge, and well south of any
meaningful influence from a blocky/amplified northern stream
pattern. This will result in daily chances of mainly diurnally
driven scattered convection. The upper low will continue to drift
over the eastern Gulf and Florida, generally opening up into more
of a trough axis. Meanwhile weak shortwaves/possible MCVs will
drift southward towards the Lower Mississippi Valley around the
upper-level ridge over the Southern Plains/northern Mexico,
merging into the eastern Gulf trough. Low-level ridging extending
westward from the Bermuda high over the northern Gulf will result
in a westerly component to the low-level flow over Central
Alabama, preventing significant Gulf moisture return. This will
result in warm temperatures and small lowering of dew points via
afternoon mixing, keeping heat index values below advisory
criteria. MLCAPE values of around 1500 J/kg and pockets of high
DCAPE will allow for some strong storms with gusty winds
practically each day, but lack of stronger instability, weak mid-
level lapse rates, and weak flow do not appear supportive of any
appreciable severe storm/high microburst potential.

1000-500mb and 850-700mb mean RH values and PWATs combined with
weak flow do not appear supportive of more than 40% PoP coverage
at this time for Sunday/Monday. Locally higher coverage will be
possible near outflow boundaries from previous day's convection
and any MCVs/weak waves but predictability of any of these
features is low. Tuesday and especially Wednesday currently look
like the days with the highest PoPs/convective coverage with a
little bit more moisture aloft, and the ECMWF also shows passage
of a weak shortwave on Wednesday which could enhance rain chances
as well. The GFS remains consistent but an outlier in spinning up
an area of probably spurious low pressure from convection over
Central America and lifting it northward into the Gulf. Without
any support from the ECMWF or the European ensembles, and nothing
in NHC's outlook, will stick close to the ECMWF forecast for the
end of the week with an upper-level ridge building in from the
west.

32/Davis

&&

.AVIATION...
00Z TAF Discussion.

Convection remains ongoing near TCL/BHM/EET. This activity will
slowly diminish through the evening but not vanish until after
midnight. Most areas remain VFR outside of thunderstorm areas. The
one wrinkle will be the patchy fog. There will be some development
again tonight. It appears to be very short lived and mainly MVFR.

Sunday will be another warm and unstable day, leading to afternoon
thunderstorm development. Started off with another PROB30 but
will be changed to VCTS or tempo the next time out. Skies mainly
have daytime cumulus, thunder remnants and cirrus. Winds light and
variable to calm overnight and south southwest around 5kts
daytime.

75

&&

.FIRE WEATHER...

Isolated to scattered showers and storms are expected through
Sunday, with the best coverage each afternoon. Cannot rule out at
least isolated coverage during the overnight hours both nights.
Light fog is possible each morning, and most likely will be near
locations that receive rainfall the previous day. RH values remain
above critical values. There are no fire weather concerns at this
time.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     69  90  68  89  69 /  30  40  30  40  30
Anniston    71  90  69  89  69 /  20  40  30  40  30
Birmingham  71  91  71  90  71 /  30  40  20  40  30
Tuscaloosa  69  92  70  92  71 /  30  40  20  40  30
Calera      69  89  69  89  70 /  30  40  20  40  30
Auburn      68  88  69  88  70 /  30  40  30  40  30
Montgomery  71  91  71  90  71 /  30  40  20  40  30
Troy        69  90  70  89  70 /  30  40  30  40  30

&&

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

&&

Hazardous Weather Outlook
National Weather Service Birmingham AL
520 AM CDT Sat Jun 9 2018

ALZ011>015-017>050-101330-
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-
520 AM CDT Sat Jun 9 2018

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...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

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

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Special Weather Statement
National Weather Service Birmingham AL
732 PM CDT SAT JUN 9 2018

ALZ033-040-100100-
Dallas AL-Perry AL-
732 PM CDT SAT JUN 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PERRY AND DALLAS COUNTIES
UNTIL 800 PM CDT...

At 732 PM CDT, Doppler radar was tracking a strong thunderstorm near
Paul M Grist State Park, or near Valley Grande, moving south at 10
mph.

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

Locations impacted include...
Selma, Valley Grande, Marion, Selmont-West Selmont, Orrville, Bogue
Chitto, Vaiden, Tyler, Central Mills, Old Cahaba Park, Dannelly
Reservoir, Dallas County Horse Arena, Belknap, Paul M Grist State
Park, Dallas Lake, Memorial Stadium, Marion Junction, Burnsville,
Potter Station and Radford.

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 3208 8719 3212 8726 3214 8725 3215 8728
      3220 8732 3220 8736 3224 8739 3227 8745
      3227 8747 3231 8747 3231 8749 3270 8737
      3270 8702 3266 8702 3266 8692 3254 8691
      3248 8688 3222 8688 3205 8691 3205 8718
TIME...MOT...LOC 0032Z 015DEG 9KT 3256 8705

75

Special Weather Statement
National Weather Service Birmingham AL
812 PM CDT SAT JUN 9 2018

ALZ025-034-100145-
Bibb AL-Shelby AL-
812 PM CDT SAT JUN 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SHELBY AND
NORTHEASTERN BIBB COUNTIES UNTIL 845 PM CDT...

At 811 PM CDT, Doppler radar was tracking a strong thunderstorm over
Alabaster, moving southeast at 15 mph.

Winds around 35 mph will be possible with this storm.

Locations impacted include...
Hoover, Alabaster, Pelham, Helena, Calera, Chelsea, Montevallo,
Columbiana, Indian Springs Village, Wilton, American Village, Oak
Mountain State Park, Maylene, Oak Mountain Amphitheater, Riverchase,
University Of Montevallo, Shelby County Airport, Meadowbrook, Joe
Tucker Park and Camp Branch.

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 3341 8670 3321 8658 3307 8685 3307 8688
      3306 8688 3302 8695 3323 8709 3325 8705
      3325 8698 3327 8697 3327 8695 3328 8693
      3330 8693 3333 8687 3333 8683 3335 8683
TIME...MOT...LOC 0111Z 310DEG 11KT 3325 8681

75

Special Weather Statement
National Weather Service Birmingham AL
850 PM CDT SAT JUN 9 2018

ALZ025-034-035-100215-
Chilton AL-Bibb AL-Shelby AL-
850 PM CDT SAT JUN 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CHILTON...
SOUTHWESTERN SHELBY AND EAST CENTRAL BIBB COUNTIES UNTIL 915 PM
CDT...

At 850 PM CDT, Doppler radar was tracking a strong thunderstorm near
University Of Montevallo, or near Montevallo, moving southeast at 10
mph.

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

Locations impacted include...
Alabaster, Calera, Montevallo, Wilton, Ashby, Brierfield Ironworks
Park, American Village, University Of Montevallo, Maylene, Shelby
County Airport, Minooka Park, Marvel, Camp Branch, Alabaster Veterans
Park, Saginaw and Dogwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3309 8704 3323 8695 3322 8672 3308 8672
      3295 8683
TIME...MOT...LOC 0150Z 305DEG 7KT 3313 8691

75

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
901 PM CDT SAT JUN 9 2018

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

0747 PM     TSTM WND DMG     1 WNW SPLASH ADVENTURE  33.39N 87.02W
06/09/2018                   JEFFERSON          AL   FIRE DEPT/RESCUE

            SEVERAL TREES DOWN ON JOHNS ROAD.

0803 PM     TSTM WND DMG     2 NE BENT BROOK GOLF CL 33.34N 86.95W
06/09/2018                   JEFFERSON          AL   FIRE DEPT/RESCUE

            TREES AND POWERLINES DOWN ON HEADRICK ROAD
            IN BESSEMER.

0803 PM     TSTM WND DMG     2 NE BENT BROOK GOLF CL 33.35N 86.95W
06/09/2018                   JEFFERSON          AL   FIRE DEPT/RESCUE

            SEVERAL TREES DOWN NEAR HOPEWELL ROAD AND
            NIXON ROAD IN BESSEMER.

0814 PM     TSTM WND DMG     1 NW CHALKVILLE         33.67N 86.66W
06/09/2018                   JEFFERSON          AL   FIRE DEPT/RESCUE

            TREES DOWN BLOCKING TYLER LOOP ROAD IN
            CENTER POINT.

0822 PM     TSTM WND DMG     5 NW HORSE PENS FORTY   33.97N 86.38W
06/09/2018                   BLOUNT             AL   FIRE DEPT/RESCUE

            SEVERAL TREES DOWN ON AIRPORT ROAD NEAR
            ONEONTA.

&&

Special Weather Statement
National Weather Service Birmingham AL
901 PM CDT SAT JUN 9 2018

ALZ019-100230-
Calhoun AL-
901 PM CDT SAT JUN 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CALHOUN COUNTY UNTIL 930
PM CDT...

At 901 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ohatchee, or 9 miles southeast of Rainbow City, moving southeast at
10 mph.

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

Locations impacted include...
Jacksonville, Saks, Glencoe, Weaver, Ohatchee, Alexandria, Neely
Henry Lake, Southside, Sulphur Springs, Neely Henry Dam and
Wellington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3391 8593 3391 8590 3381 8575 3365 8592
      3376 8605 3381 8607 3383 8605 3384 8607
      3384 8605 3385 8605 3385 8602 3387 8602
      3386 8600 3389 8599 3389 8597 3391 8597
      3392 8593
TIME...MOT...LOC 0201Z 305DEG 7KT 3383 8597

75