073
FXUS64 KHUN 161738
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
1238 PM CDT Wed Apr 16 2025

...New AVIATION...

.NEAR TERM...
(Rest of Today and Tonight)
Issued at 1142 AM CDT Wed Apr 16 2025

Clear skies prevailed across the greater southeast region, as
surface high pressure centered over Deep South controlled the
general weather situation. 11 AM temperatures were warming into
the mid 60s with light winds. An upper level area of low pressure
over eastern Canada should move towards Greenland over the next
couple of days. This, and synoptic scale troughing forming over
the western North American domain, should result in a ridging
pattern forming over the eastern CONUS.

Under a slowly developing upper ridge, dry conditions should
continue. Area morning soundings indicated that a few fair weather
cumulus could form in the mid afternoon, as temperatures rise to
around 70. Minimum afternoon relative humidity values should be
reduced into the mid 20s percent range. Light winds and low KBDI
indices will keep outdoor fire spread potential low. Generally
clear skies should continue into the evening, with low temps
cooling into the mid and upper 40s.

&&

.SHORT TERM...
(Thursday through Friday night)
Issued at 1142 AM CDT Wed Apr 16 2025

On Thursday, surface high pressure will be moving across the VA/NC
region, and establishing a southerly flow. This flow and rising
heights and more sun than clouds, should produce even warmer
conditions. High temperatures tomorrow should rise into the mid
70s to around 80, with southerly winds of 5-15 mph. Minimum
afternoon relative humidity values should be reduced into the
upper 20s percent range. Low temperatures Thursday night should be
milder in the 50s (lower 50s east to upper 50s west).

Even warmer conditions under partly cloudy skies are forecast for
Good Friday, with highs rising into the low/mid 80s. Lows Friday
night will range from the mid 50s east to mid 60s west.

&&

.LONG TERM...
(Saturday through Tuesday)
Issued at 1026 PM CDT Tue Apr 15 2025

Latest extended range model guidance suggests that an amplifying
shortwave (embedded within the base of a broader longwave trough
to our west) will advance eastward across the southern Rockies on
Saturday, before acquiring a sharp negative tilt as it ejects
northeastward from the southern High Plains into the southwestern
Great Lakes Saturday night-Sunday night. At the surface, moderate
southerly flow will continue across the TN Valley as the related
surface low tracks slowly eastward across northwest TX Saturday,
before deepening and lifting northeastward into southwestern MO
Saturday night and into the Great Lakes by Sunday night.
Widespread anafrontal convection will remain focused well to our
north/west (in the vicinity of a stationary front) on
Saturday/Saturday night, although outflow emanating from this
activity may sneak into northwest AL early Sunday morning perhaps
initiating a few showers/storms prior to sunrise.

Present indications are that a QLCS will gradually develop late
Sunday morning in the vicinity of a prefrontal surface trough as
it tracks eastward across MO/AR and into the Mid-South region.
Although there are notable differences in timing (likely related
to the stronger deep-layer forcing for ascent with the mid-level
trough bypassing our region to the north), the prefrontal trough
will eventually be overtaken by the cold front, with this feature
continuing to focus the development of convection as it spreads
slowly southeastward across our CWFA (likely at some point late
Sunday night/early Monday morning). Mid-level SW flow of 45-55
knots will provide sufficient deep-layer shear for storm
organization, but with only minor veering in the surface-500 mb
layer and shear aligned nearly parallel to the surface boundary,
multicell storm clusters would be the favored storm mode. With
dewpoints in the u50s-m60s beneath weak lapse rates aloft
generating CAPE of 250-750 J/kg, marginally severe wind and hail
will be capable with these clusters, and although the low level
jet will certainly not be as strong as it could be this time of
year (30-40 knots), sufficient low-level shear will exist for a
few brief tornadoes. Convection will come to an end as the front
drifts further southeastward Monday, with a slightly cooler/drier
airmass infiltrating the region Monday night/Tuesday.

&&

.AVIATION...
(18Z TAFS)
Issued at 1238 PM CDT Wed Apr 16 2025

VFR conditions should continue across the area for the TAF.
Surface high pressure over the region will build east, bringing a
southerly flow across the area on Thu. Light winds into the
overnight, should become southerly 5-15kt after daybreak Thu
morning.

&&

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

$$

NEAR TERM...RSB
SHORT TERM....RSB
LONG TERM....70
AVIATION...RSB