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Chattanooga, Tennessee 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for 3 Miles WSW Chattanooga TN
National Weather Service Forecast for: 3 Miles WSW Chattanooga TN
Issued by: National Weather Service Morristown, TN
Updated: 1:43 pm EDT Jul 14, 2025
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms.  Mostly sunny and hot, with a high near 93. Heat index values as high as 101. Calm wind becoming northwest around 5 mph.
Slight Chance
T-storms

Tonight

Tonight: A 10 percent chance of showers and thunderstorms before 7pm.  Mostly clear, with a low around 74. Calm wind.
Slight Chance
T-storms then
Mostly Clear
Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm.  Sunny and hot, with a high near 96. Heat index values as high as 106. Calm wind.
Sunny then
Chance
T-storms
Tuesday
Night
Tuesday Night: A 20 percent chance of showers and thunderstorms before 2am.  Partly cloudy, with a low around 75. Calm wind.
Slight Chance
T-storms

Wednesday

Wednesday: A slight chance of showers, then showers and thunderstorms likely after 11am.  Mostly sunny and hot, with a high near 94. Calm wind becoming south around 5 mph in the afternoon.  Chance of precipitation is 60%.
Slight Chance
T-storms then
T-storms
Likely
Wednesday
Night
Wednesday Night: Showers and thunderstorms likely, mainly before 8pm.  Partly cloudy, with a low around 75. Calm wind.  Chance of precipitation is 60%.
T-storms
Likely then
Chance
Showers
Thursday

Thursday: A chance of showers, then showers and thunderstorms likely after 11am.  Mostly sunny and hot, with a high near 93. Calm wind becoming south around 5 mph in the afternoon.  Chance of precipitation is 60%.
Chance
T-storms then
T-storms
Likely
Thursday
Night
Thursday Night: Showers and thunderstorms likely, mainly before 8pm.  Partly cloudy, with a low around 75. Chance of precipitation is 60%.
T-storms
Likely then
Chance
T-storms
Friday

Friday: Showers and thunderstorms likely, mainly after 2pm.  Mostly sunny and hot, with a high near 92. Chance of precipitation is 70%.
Slight Chance
T-storms then
T-storms
Likely
Hi 93 °F Lo 74 °F Hi 96 °F Lo 75 °F Hi 94 °F Lo 75 °F Hi 93 °F Lo 75 °F Hi 92 °F

Hazardous Weather Outlook
 

This Afternoon
 
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 93. Heat index values as high as 101. Calm wind becoming northwest around 5 mph.
Tonight
 
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 74. Calm wind.
Tuesday
 
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny and hot, with a high near 96. Heat index values as high as 106. Calm wind.
Tuesday Night
 
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 75. Calm wind.
Wednesday
 
A slight chance of showers, then showers and thunderstorms likely after 11am. Mostly sunny and hot, with a high near 94. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%.
Wednesday Night
 
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 60%.
Thursday
 
A chance of showers, then showers and thunderstorms likely after 11am. Mostly sunny and hot, with a high near 93. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
 
Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 75. Chance of precipitation is 60%.
Friday
 
Showers and thunderstorms likely, mainly after 2pm. Mostly sunny and hot, with a high near 92. Chance of precipitation is 70%.
Friday Night
 
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Saturday
 
Showers and thunderstorms likely. Mostly sunny and hot, with a high near 93. Chance of precipitation is 70%.
Saturday Night
 
Showers and thunderstorms likely. Partly cloudy, with a low around 74. Chance of precipitation is 60%.
Sunday
 
Showers and thunderstorms likely. Mostly sunny and hot, with a high near 92. Chance of precipitation is 60%.
Sunday Night
 
Showers and thunderstorms likely. Partly cloudy, with a low around 75. Chance of precipitation is 60%.
Monday
 
A chance of showers and thunderstorms. Mostly sunny and hot, with a high near 94.

 

Forecast from NOAA-NWS for 3 Miles WSW Chattanooga TN.

Weather Forecast Discussion
792
FXUS64 KMRX 141705
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
105 PM EDT Mon Jul 14 2025

...New SHORT TERM, LONG TERM, AVIATION...

.SHORT TERM...
(This evening through Tuesday)
Issued at 103 PM EDT Mon Jul 14 2025

Key Messages:

1. Isolated to scattered showers and thunderstorms through this
evening. Locally gusty winds and heavy downpours possible with the
strongest storms.

2. Hot and humid conditions on Tuesday, with isolated showers and
storms. Central and southern TN valley will see Heat Indices in
upper 90s to low 100s. Heat Indices in the low to mid 90s more
likely for NE TN, SW VA, and SW NC.

Discussion:

We are currently in zonal flow due to high pressure to our south and
a weak upper trough to our north-northeast. This will allow for
another day of isolated to scattered showers and storms through this
evening. Storms will be of the summer-time pulse variety due to
little to no shear in the atmosphere. MLCAPE values should average
around 1500 J/kg through the afternoon. Any stronger storm could
lead to gusty winds up to 40mph as well as isolated flash flooding.
Patchy dense fog possible yet again tonight for areas that see
decent rainfall today.

On Tuesday, the trough is well to our northeast. This allows high
pressure to push further north. This should result in the more
traditional summer-time terrain driven showers and storms that occur
during the afternoon hours. This should result in less coverage
across valley locations compared to the last few days.

The bigger story will be the heat and Heat Indices. Heat indices in
the upper 90s to near 100 are expected for the central East
Tennessee valley, with the southern valley reaching near or into the
low 100s. Slightly lower Heat Indices in the low to mid 90s are
expected for northeast Tennessee, southwest Virginia, as well as
southwest North Carolina.

That being said, the exact timing of convective initiation and
coverage of storms could impact these values. Less storm coverage
and later initiation means higher probability that these forecast
Heat Indices occur. Earlier initiation and greater coverage means
these forecast values are much less likely.

&&

.LONG TERM...
(Tuesday night through next Monday)
Issued at 103 PM EDT Mon Jul 14 2025

Key Messages:


1. Daily chances of PM showers and storms continue through the
extended period. With each day, the strongest storms could produce
locally gusty winds and heavy downpours, with possible flash
flooding.

2. Upper ridge remains strong through the long term. Upper 90s to
low 100s Heat Indices will be common across the central and
southern TN valley.

Discussion:

Upper level ridging will likely remain strong through the period.
The only exception may be on Thursday, as a shortwave trough passes
to our north. High pressure may be strong enough to prevent this
feature from dipping to far south and into our area. Otherwise, the
hot and humid airmass will promote Heat Indices in the upper 90s to
low 100s across the central and southern TN valley. Lower Heat
Indices in the low to mid 90s are expected across north TN,
southwest VA an NC. Please practice heat safety during this time.

Diurnal summer-time showers and storms expected each day. The
greatest focus will be along the high terrain of the Cumberland
Plateau and mountains of east TN, southwest NC, and southwest VA. On
any given day, any stronger storm will be capable of producing
strong gusty winds and heavy rainfall which could lead to isolated
flash flooding.

&&

.AVIATION...
(18Z TAFS)
Issued at 103 PM EDT Mon Jul 14 2025

VFR conditions are expected to prevail for much of the next 24
hours across the three TAF sites. However, diurnal heating will
lead to the development of scattered thunderstorms this afternoon
and early evening, primarily between 19Z and 00Z. Any fog
development overnight should be localized and not significantly
impact flight operations with the exception of KTRI. Fog affecting
visibility late tonight will clear shortly after sunrise.
Otherwise conditions will return to VFR a little later Tuesday
morning.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             73  95  75  92 /  10  20  20  60
Knoxville McGhee Tyson Airport, TN  72  96  73  94 /  20  30  30  60
Oak Ridge, TN                       71  94  72  92 /  10  30  30  60
Tri Cities Airport, TN              68  89  70  88 /  30  50  40  70

&&

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

$$
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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