Decatur, Alabama 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

072
FXUS64 KHUN 282355
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
655 PM CDT Sun Jun 28 2026

...New CLIMATE...

.KEY MESSAGES...
Updated at 135 PM CDT Sun Jun 28 2026

  - A heat wave will occur this week with a Heat Risk value of 3
    out of 4 (Major category) to 4 out of 4 (Extreme category).

  - A Heat Advisory is in effect through 7 PM Tuesday.

&&

.NEAR TERM...
(Tonight)
Issued at 135 PM CDT Sun Jun 28 2026

Diurnal cumulus should dissipate by around sunset leaving a clear
sky overnight. Muggy conditions are expected, but at this point
any fog development would be very patchy in nature. Dew points in
the lower 70s will keep low temperatures in that ballpark for
overnight lows. The Heat Advisory remains in effect overnight due
to the warm overnight low temperatures.

&&

.SHORT TERM...
(Monday through Tuesday)
Issued at 903 AM CDT Sun Jun 28 2026

The 596 dkm 5h anticyclone will shift northeast from northern MS
Monday morning to the KY/TN state line on Tuesday. This will
enable easterly flow to begin by Tuesday in lower to mid levels,
and thus will have to monitor moisture backdooring our area from
the east. For now, PoPs of 20% or less will occur during the
afternoon hours Tuesday generally east of I-65. High temperatures
will reach the 93-97 range in valleys on Monday, and 94-98 on
Tuesday (upper 80s to lower 90s atop the Cumberland Plateau).

.LONG TERM...
(Wednesday through Saturday)
Issued at 1056 PM CDT Sat Jun 27 2026

By midweek, the upper ridge will shift from being centered over the
Tennessee Valley to the Appalachians. Even so, this feature will
largely maintain its hold over the Southeast through the work week.
Global models then show it shifting eastward and flattening a bit by
the weekend as a series of shortwaves ripple over the Great Lakes
region. At the surface, high pressure persists over the Appalachians
and Southeastern states through the early part of next weekend. While
a very low chance of a few showers/storms is suggested by the NBM
for Wednesday and Thursday, the aforementioned pattern indicates that
most areas are more likely to remain dry. Although, by late in the
week, as the upper ridge shifts a bit more east and flattens, perhaps
the return flow would be enough to increase shower and storm chances
(20-30%) and bring a more summertime, diurnal pattern to the region.

Overall, the main concern will be the continued dangerous heat.
Highs are forecast to remain steady in the mid 90s, with some spots
potentially reaching the upper 90s (especially over NW AL) each day.
Heat indices generally range between 102-110 degrees during this time
as well. In addition, NWS HeatRisk is slated to be Major to Extreme
(Levels 3 and 4 out of 4) Wednesday through Saturday. This is likely
due in part to low temperatures not cooling off much at night, with
values forecast to merely drop into the mid to upper 70s each night.
WBGTs are also in the upper 80s to around 90 degrees. Therefore, not
much relief is in sight, at least through next Saturday. Heat
Advisories will likely be issued to account for this heat wave.

Make sure to take precautions for the dangerous heat! Wear light-
colored loose-fitting clothing, stay hydrated, and take frequent
breaks in the shade if you work outside or have outdoor activities!
Look before you lock - never leave people or pets in vehicles!

&&

.LONG TERM...
(Wednesday through Saturday)
Issued at 1056 PM CDT Sat Jun 27 2026

By midweek, the upper ridge will shift from being centered over the
Tennessee Valley to the Appalachians. Even so, this feature will
largely maintain its hold over the Southeast through the work week.
Global models then show it shifting eastward and flattening a bit by
the weekend as a series of shortwaves ripple over the Great Lakes
region. At the surface, high pressure persists over the Appalachians
and Southeastern states through the early part of next weekend. While
a very low chance of a few showers/storms is suggested by the NBM
for Wednesday and Thursday, the aforementioned pattern indicates that
most areas are more likely to remain dry. Although, by late in the
week, as the upper ridge shifts a bit more east and flattens, perhaps
the return flow would be enough to increase shower and storm chances
(20-30%) and bring a more summertime, diurnal pattern to the region.

Overall, the main concern will be the continued dangerous heat.
Highs are forecast to remain steady in the mid 90s, with some spots
potentially reaching the upper 90s (especially over NW AL) each day.
Heat indices generally range between 102-110 degrees during this time
as well. In addition, NWS HeatRisk is slated to be Major to Extreme
(Levels 3 and 4 out of 4) Wednesday through Saturday. This is likely
due in part to low temperatures not cooling off much at night, with
values forecast to merely drop into the mid to upper 70s each night.
WBGTs are also in the upper 80s to around 90 degrees. Therefore, not
much relief is in sight, at least through next Saturday. Heat
Advisories will likely be issued to account for this heat wave.

Make sure to take precautions for the dangerous heat! Wear light-
colored loose-fitting clothing, stay hydrated, and take frequent
breaks in the shade if you work outside or have outdoor activities!
Look before you lock - never leave people or pets in vehicles!

&&

.AVIATION...
(00Z TAFS)
Issued at 546 PM CDT Sun Jun 28 2026

VFR conditions will persist through the TAF period with light SW
winds and a clearing cu field this evening.

&&

.CLIMATE...
Issued at 655 PM CDT Sun Jun 28 2026

Moderate Risk for Much Above Normal Temperatures:

The Climate Prediction Center has included northwest Alabama in a
Moderate Risk for Much Above Normal Temperatures on July 6. This
means that there is a medium chance (40-60%) for temperatures to
reach or exceed 93-95 degrees with heat indices above 105 degrees
during this period.

More information on the CPC U.S. Hazards Outlook can be found at:

https://www.cpc.ncep.noaa.gov/products/predictions/threats/threats.php

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...Heat Advisory until 7 PM CDT Tuesday for ALZ001>010-016.

TN...Heat Advisory until 7 PM CDT Tuesday for TNZ076-096-097.

&&

$$

NEAR TERM...25
SHORT TERM....25
LONG TERM....26
AVIATION...25