339
FXUS64 KHUN 171715
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
1215 PM CDT Fri May 17 2024

...New AVIATION...

.NEAR TERM...
(Rest of Today)
Issued at 914 AM CDT Fri May 17 2024

An area of sfc low pressure continues to move eastward along the
Gulf Coast, bringing a complex of storms well south of our area
(in southern MS/AL) this afternoon. North of this, in the TN
Valley, showers are continuing to move northeastward through the
area, bringing a low chance of lightning. As the afternoon
progresses and instability increases, some stronger storms cannot
be ruled out. However, no severe weather is forecast at this time
due to the lack of shear present. In any stronger storm that
forms, gusty winds and small hail may be present along with heavy
rain and lightning. Medium-high rain chances (50-80%) will
continue through the afternoon before decreasing to low-medium
chances (40% or less) into the evening hours. Broken to overcast
cloud cover will allow high temperatures to remain in the upper
60s to mid 70s this afternoon.

&&

.SHORT TERM...
(Tonight through Monday)
Issued at 255 AM CDT Fri May 17 2024

Whether this area of showers and thunderstorms can maintain
itself or strengthen as the front moves into NW Alabama later this
evening is a big question mark. Shear is very weak (15 to 25
knots) in most guidance. CAPE is not overly impressive, but does
climb to between 500 and 1200 J/KG later today in guidance. Given
the weak shear and worked over atmosphere, despite the front
moving into NW Alabama and southern middle Tennessee, not
expecting precipitation coverage to be much.

However, during the day on Saturday, as the front moves further
southeast into the area, daytime heating should allow for an area
of showers and thunderstorms should reform along the front. Again
shear will be very weak. Instability won`t be overly impressive
either (mainly 500 to 1000 J/KG). Thus, not expecting any severe
thunderstorm activity. However an area of showers and thunderstorms
will likely develop. The weak cold front and upper level trough
axis associated with it move southeast into southern Alabama and
Georgia late Saturday night in all guidance. Returning sunshine
and some warm air advection should allow highs to climb back into
the upper 70s.

By Sunday morning, expect a dry forecast west of the I-65 corridor,
as an amplified upper ridge begins building east into the area.
Lows will be slightly cooler, but not a lot with temperatures in
the 60 to 64 degree range as you wake up. However, with a weak
upper low just to our east of southeast along the front, a low
chance (20-30%) of showers cannot be ruled out. The very strong
upper level ridge working into the area combined with returning
sunshine should allow temperatures to climb into the lower to mid
80s.

This upper level ridging only become more amplified Sunday night
into Monday morning. An upper level disturbance moves well north
of the area on the NW side of the upper ridge towards the Ohio
Valley into Monday morning. The overall pattern doesn`t change
much though into Monday. Lows shouldn`t change much, but highs
will likely warm a bit more into the mid 80s in most locations on
Monday with dry weather firmly in place.

&&

.LONG TERM...
(Monday night through Thursday)
Issued at 255 AM CDT Fri May 17 2024

Dry and warm conditions will continue into Tuesday, and thanks to a
flow rounding a surface ridge along the east coast. After a mild
night with lows in the lower 60s, highs on Monday should rise into
the mid 80s under mostly sunny skies. This trend should continue on
Tuesday with highs nearing 90 degrees in a few places. Lows in the
mid 60s Mon night should range in the upper 60s to near 70 Tue night.

A storm system forecast to form over the Rockies and adjacent High
Plains over the weekend will head to the NE, reaching the Great
Lakes on Wednesday. A cold front trailing south of it will move
across the area on Wed. Moisture convergence and lift preceding it
will return medium chances (30-50%) of showers and thunderstorms
beginning Tue night. Unsettled weather with scattered showers and
thunderstorms will remain in the forecast into Thursday. Overall
storm strength should remain "general" with a risk of strong outflow
wind gusts, heavy downpours, and sudden and/or frequent lightning.
Even with more clouds and rain chances, high temperatures on Wed/Thu
should range in the mid/upper 80s, and lows in the 60s.

&&

.AVIATION...
(18Z TAFS)
Issued at 1215 PM CDT Fri May 17 2024

Lowered ceilings and visibilities are forecast to persist through
the TAF period, causing periods of MVFR to IFR conditions.
Overnight into Saturday morning, periods of LIFR conditions are
possible as low ceilings move into the TN Valley with continued
chances of showers.

&&

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

$$

NEAR TERM...HC
SHORT TERM....KTW
LONG TERM....RSB
AVIATION...HC