Heat Advisory 4, NWS Mobile, AL

Area Forecast Discussion
National Weather Service Mobile AL
138 PM CDT Sun Jul 12 2020

.NEAR TERM /Now Through Monday/...We are still stuck sandwiched
between a strengthening upper ridge over Western Texas and New
Mexico and a weakening upper trough draped over the northeastern
US. As a result, northwesterly flow remains over most of the state
of Alabama with several subtle shortwaves chugging along the
periphery of the ridge. What appears to be a mid-level front
extended north to south across Alabama marking the difference
between drier air to the east (PWATS of 1 to 1.5 inches) and deep
moist air to the west (PWATS of 2 to 2.25 inches). MLCape values
along and west of this boundary have climbed to near 3000 J/KG
with a strong north to south Cape gradient across our area. An
ongoing line of strong to severe storms (MCS) was located just
north of Birmingham. Typically in this sort of pattern these MCS's
will ride along the Cape gradient. As a result, the ongoing line
of strong to severe storms will continue it's tour of Alabama and
enter our area from the north by late this afternoon and evening.
The atmosphere will be primed for damaging winds with 25-35 knots
of 0-3KM bulk shear and more than sufficient cape values. While
low, a tornado cannot be completely ignored. This will be true
where 0-3KM bulk shear values approach 35+ knots. Storms will
continue into the evening likely reaching the coast by around 11
pm to midnight. Storms will likely weaken given the loss of
daytime heating; however, there still should be enough cape to
keep storms going along the leading edge of the outflow boundary.

Tomorrow will look more like a standard summer day as the outflow
from tonight storms will likely push offshore and wipe out some of
the moisture across the area. Most of the day will be spent
recovering. The best area of storms will likely be along the coast
where the best moisture will be able to recover and surface
forcing would be maximized along the afternoon seabreeze
circulation. Like almost every afternoon, a few strong to severe
storms will be possible but dry air will likely limit coverage and
severe potential.

Temperatures will continue to be hot with the presence of the
upper ridge to our west. The good news is that tonights MCS might
mix the atmosphere making it a little cooler this evening;
however, the added low level moisture will probably bump dewpoints
up in the morning and lead to peak solar heating during the
morning. Temperatures will quickly rise into the low 90s with
dewpoints in the mid 70s. Heat indexes will range from 104-108
with the highest heat indexes likely over Southeast Mississippi,
Mobile and Baldwin counties. I am still mulling over the potential
for another heat advisory tomorrow as I wan't to see how much we
mix out this afternoon. Vertical mixing that brings drier air to
the surface would be the one saving grace from the downright
oppressive heat except usually when that happens our temperatures
spike up into the mid to upper 90s. You really can't win around
here as it's going to be hot one way or the other. I will likely
re-analyze the potential for a heat advisory later this afternoon
and provide an update with the 4 pm package. Lows will still be
in the 70s and I would not expect that to change until November.
Rip current risk will be low today increasing to Moderate tomorrow
as the next swell approaches our beaches. BB/03

&&

.AVIATION...
18Z issuance...VFR cigs will continue through the afternoon and
into the early evening. A line of strong to possibly severe
storms will approach the area from the north this evening. MVFR to
IFR conditions will be possible with this line as it moves from
north to south across the area. Storms should move offshore and
dissipate around midnight with VFR conditions returning shortly
after midnight. Winds will be light out of the west-northwest
through tomorrow. BB/03

&&

.MOB WATCHES/WARNINGS/ADVISORIES...
AL...Heat Advisory until 6 PM CDT this evening for ALZ261>266.

FL...None.
MS...Heat Advisory until 6 PM CDT this evening for MSZ067-075-076-078-
     079.

GM...None.
&&

This product is also available on the web at:
http://weather.gov/mob

Special Weather Statement
National Weather Service Mobile AL
258 PM CDT Sun Jul 12 2020

ALZ051-122045-
Choctaw AL-
258 PM CDT Sun Jul 12 2020

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...
NORTHERN CHOCTAW COUNTY UNTIL 345 PM CDT...

At 258 PM CDT, the strong thunderstorm was located 7 miles southwest
of Kinterbish, or 11 miles south of Cuba, moving east at 30 mph.

Wind gusts of 45 to 55 mph will be possible with this storm.

Locations impacted include...
Lisman and Pennington.

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 3231 8793 3228 8793 3228 8794 3230 8794
      3230 8800 3228 8801 3228 8802 3226 8801
      3218 8801 3215 8802 3214 8804 3210 8805
      3219 8844 3231 8842
TIME...MOT...LOC 1958Z 280DEG 27KT 3228 8839

CGAL

Special Weather Statement
National Weather Service Mobile AL
307 PM CDT Sun Jul 12 2020

ALZ051-052-MSZ067-122045-
Choctaw AL-Washington AL-Wayne MS-
307 PM CDT Sun Jul 12 2020

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...
SOUTHWESTERN CHOCTAW...NORTHWESTERN WASHINGTON AND WAYNE COUNTIES
UNTIL 345 PM CDT...

At 306 PM CDT, the strong thunderstorm was located 8 miles northwest
of Waynesboro, moving southeast at 30 mph.

Wind gusts of 40 to 50 mph will be possible with this storm.

Locations impacted include...
Waynesboro, Clara and Millry.

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 3189 8851 3162 8828 3149 8877 3178 8892
TIME...MOT...LOC 2006Z 314DEG 27KT 3178 8873

CGAL