Andrews

• This Afternoon

  81°high

  Chance Showers And Thunderstorms

  A chance of showers and thunderstorms. Partly sunny, with a high near 81. South wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

  Wind S 10 mph · 30% chance of precipitation

• Tonight

  68°low

  Chance Showers And Thunderstorms then Showers And Thunderstorms

  A chance of showers and thunderstorms before 8pm, then showers and thunderstorms between 8pm and 1am, then a chance of showers and thunderstorms between 1am and 2am, then showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 0 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

  Wind S 0 to 10 mph · 79% chance of precipitation

• Sunday

  81°high

  Chance Showers And Thunderstorms

  A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms between 10am and 11am, then a chance of showers and thunderstorms between 11am and 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 81. Southwest wind 0 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.

  Wind SW 0 to 10 mph · 49% chance of precipitation

• Sunday Night

  66°low

  Showers And Thunderstorms Likely then Chance Showers And Thunderstorms

  Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 2am. Mostly cloudy, with a low around 66. Southwest wind 0 to 10 mph. Chance of precipitation is 60%.

  Wind SW 0 to 10 mph · 56% chance of precipitation

• Monday

  80°high

  Chance Showers And Thunderstorms

  A chance of rain showers between 7am and 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind 0 to 5 mph. Chance of precipitation is 80%.

  Wind SW 0 to 5 mph · 84% chance of precipitation

• Monday Night

  64°low

  Showers And Thunderstorms then Chance Showers And Thunderstorms

  Showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Northwest wind around 0 mph. Chance of precipitation is 80%.

  Wind 0 mph · 84% chance of precipitation

• Tuesday

  81°high

  Showers And Thunderstorms

  A slight chance of rain showers before 8am, then showers and thunderstorms. Partly sunny, with a high near 81. Southwest wind 0 to 5 mph. Chance of precipitation is 80%.

  Wind SW 0 to 5 mph · 79% chance of precipitation

• Tuesday Night

  65°low

  Showers And Thunderstorms then Slight Chance Showers And Thunderstorms

  Showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Partly cloudy, with a low around 65. Chance of precipitation is 80%.

  Wind 0 mph · 79% chance of precipitation

• Wednesday

  82°high

  Chance Showers And Thunderstorms

  A chance of showers and thunderstorms between 8am and 2pm, then showers and thunderstorms likely. Mostly sunny, with a high near 82. Chance of precipitation is 60%.

  Wind S 0 to 5 mph · 62% chance of precipitation

• Wednesday Night

  66°low

  Showers And Thunderstorms Likely then Partly Cloudy

  Showers and thunderstorms likely before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 60%.

  Wind 0 mph · 62% chance of precipitation

• Thursday

  83°high

  Chance Showers And Thunderstorms

  A slight chance of rain showers between 8am and 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 50%.

  Wind 0 mph · 52% chance of precipitation

• Thursday Night

  67°low

  Chance Showers And Thunderstorms

  A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 67. Chance of precipitation is 50%.

  Wind 0 mph · 52% chance of precipitation

• Friday

  85°high

  Showers And Thunderstorms Likely

  A chance of rain showers between 8am and 2pm, then showers and thunderstorms likely. Partly sunny, with a high near 85. Chance of precipitation is 60%.

  Wind 0 mph · 62% chance of precipitation

• Friday Night

  66°low

  Showers And Thunderstorms Likely then Partly Cloudy

  Showers and thunderstorms likely before 8pm. Partly cloudy, with a low around 66.

  Wind 0 mph · 62% chance of precipitation

The reasoning behind the forecast, in the forecaster’s own words. In this region the elevation detail that never reaches a point forecast usually shows up here.

000
FXUS64 KMRX 011913
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
313 PM EDT Sat Aug 1 2026

...New DISCUSSION...

.KEY MESSAGES...
Updated at 245 PM EDT Sat Aug 1 2026

- Additional showers and storms are expected this afternoon and
  evening. A few storms may become strong to severe, especially 
  over the Plateau and the southern Tennessee valley this evening.
  Localized flooding will also be possible.

- Isolated damaging winds and flooding will be possible with
  additional storms across far northeast Tennessee and southwest
  Virginia Sunday afternoon.

- Scattered showers and storms can be expected each day Monday
  through Friday, especially during the afternoon hours.

&&

.DISCUSSION...
Issued at 245 PM EDT Sat Aug 1 2026

Upper level pattern consists of a shortwave diving through 
Mississippi River Valley towards the Ohio and Tennessee Valley 
region. A warm front lifting through the CWA has been the driving 
force for showers and a few thunderstorms this morning and early 
afternoon. While a few isolated showers can be noted behind the main 
rain shield, some clearing is present across portions of central 
Tennessee into northern Alabama and along the Cumberland Plateau. A 
trailing cold front is expected to progress through the region this 
evening, with additional shower and storm development along and 
ahead of this front. There are still some discrepancies among CAMs 
in how well organized or the exact coverage area of convection along 
this feature, however, one trend that catches my eye is that of the 
NAMs.

Latest surface observations show temperatures rebounding into the 
low to mid 80s in the southern valley and plateau, upper 70s on the 
northern plateau, but remaining in the low 70s in portions of the 
central valley and eastward. The NAM seems to depict a trend in 
storm coverage that best aligns with where precip has lingered 
longest this afternoon... one where storms that develop over middle 
Tennessee persist into the Plateau, but as the activity progresses 
further east into the CWA, the focus is generally along and south of 
I-40 where better destabilization occurs among higher theta-e 
advection. 

Overall, HREF depicts around 1500-2000 J/kg of MLCAPE and effective 
shear between 20 and 25kts as this activity is expected to take 
place. Additionally, PWAT will be well into the 90th percentile. 
This will lead to damaging winds and isolated flooding as the 
primary hazards. However, the shear is just strong enough that a low 
tornado risk will is in place, primarily along the Cumberland 
Plateau and southern Valley where the greatest destabilization has 
occurred. Of course any storm that has enough rotation for a 
potential tornado could also exhibit small hail as well. Activity 
will gradually trend downward in intensity around midnight or 
shortly thereafter. 

As we head into Sunday afternoon, a few additional showers and 
storms may develop along the slowly progressing cold front. Latest 
trend in CAMs favors far northeast Tennessee and southwest Virginia 
for additional convective initiation. Strong effective shear and 
increasing DCAPEs will support at least a isolated wind damage 
and flooding threat where storms train along the boundary. 
Depending on how much clearing takes place and resulting CAPE 
profiles, cannot rule out some small hail as well. 

An upper low is expected to be cutoff as we head into the new work 
week, which will continue to promote daily chances of showers and 
storms among slightly below normal temperatures. Some
deterministic models begin to eject the low late week, with a 
downward trend in precip chances and slight warming trend. 

&&

.AVIATION...
(18Z TAFS)
Issued at 156 PM EDT Sat Aug 1 2026

Rain shield is moving from the central to eastern portions of the
forecast area at this time. The back edge should be through TYS
within the next hour or so, and estimated around 20/21Z for TRI.
Reduced visibility and occasional cig reductions cannot be ruled
out with this activity. Unsettled pattern continues as additional
showers and storms develop and advect west to east this evening
into the overnight hours. Thunderstorm chances are greatest at
CHA/TYS. Lingering MVFR conditions are possible behind the
activity overnight. However, the lowest uncertainty is at TRI due
to expected downsloping. MOS and LAMP guidance is aggressive with
low cigs while HREF probabilities are less than 20% at TRI. 

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             72  86  70  85 /  90  30  20  70 
Knoxville McGhee Tyson Airport, TN  72  86  70  84 /  80  40  40  80 
Oak Ridge, TN                       71  84  69  84 /  90  40  40  80 
Tri Cities Airport, TN              69  83  68  82 /  70  80  60  70 

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.
&&

$$

DISCUSSION...KRS
AVIATION...KRS