Chattanooga, Tennessee 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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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: 1:46 am EDT Jun 29, 2025 |
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Overnight
 Mostly Cloudy
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Sunday
 Patchy Fog then Chance T-storms
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Sunday Night
 Chance T-storms then Patchy Fog
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Monday
 Chance T-storms and Patchy Fog then T-storms
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Monday Night
 T-storms then Chance Showers
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Tuesday
 Chance T-storms then T-storms
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Tuesday Night
 T-storms then Chance Showers and Patchy Fog
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Wednesday
 Partly Sunny then Slight Chance T-storms
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Wednesday Night
 Slight Chance T-storms then Mostly Clear
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Lo 72 °F |
Hi 90 °F |
Lo 72 °F |
Hi 88 °F |
Lo 73 °F |
Hi 88 °F |
Lo 71 °F |
Hi 90 °F |
Lo 69 °F |
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Hazardous Weather Outlook
Overnight
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Mostly cloudy, with a low around 72. Calm wind. |
Sunday
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A 50 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog between 7am and 8am. Otherwise, partly sunny and hot, with a high near 90. Heat index values as high as 99. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Sunday Night
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A 30 percent chance of showers and thunderstorms, mainly before 10pm. Patchy fog between 2am and 3am. Otherwise, partly cloudy, with a low around 72. Calm wind. |
Monday
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A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Patchy fog between 7am and 8am. High near 88. Heat index values as high as 96. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 80%. |
Monday Night
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Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Low around 73. Southwest wind around 5 mph becoming calm. Chance of precipitation is 80%. |
Tuesday
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A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 88. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%. |
Tuesday Night
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Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Patchy fog between 2am and 3am. Low around 71. Calm wind. Chance of precipitation is 80%. |
Wednesday
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A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. |
Wednesday Night
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A 10 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 69. |
Thursday
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Sunny and hot, with a high near 92. |
Thursday Night
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Mostly clear, with a low around 69. |
Independence Day
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A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 94. |
Friday Night
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A 10 percent chance of showers and thunderstorms. Mostly clear, with a low around 72. |
Saturday
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A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 94. |
Forecast from NOAA-NWS
for 3 Miles WSW Chattanooga TN.
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Weather Forecast Discussion
766
FXUS64 KMRX 290513
AFDMRX
Area Forecast Discussion
National Weather Service Morristown TN
113 AM EDT Sun Jun 29 2025
...New SHORT TERM, LONG TERM, AVIATION...
.SHORT TERM...
(Today and tonight)
Issued at 1258 AM EDT Sun Jun 29 2025
Key Messages:
1. Isolated showers and thunderstorms again this afternoon, mainly
across the higher elevations.
2. Summer heat continues with heat index values near 100F.
Discussion:
Isolated to scattered showers and thunderstorms are expected to
develop again this afternoon. The greatest coverage will be across
the mountains and plateau with isolated coverage across the
valley. The current RAP shows highest instability generally south
and west of Knoxville where low-level moisture is highest, so the
southern plateau and Chattanooga will likely have higher chances
of thunderstorms during the afternoon hours than further northeast
across the valley. PW values will remain near 2.0 inches with
locally heavy rain rates and the potential for isolated flash
flooding issues.
&&
.LONG TERM...
(Monday through Sunday)
Issued at 1258 AM EDT Sun Jun 29 2025
Key Messages:
1. Thunderstorms continue Monday and Tuesday, mainly during the
afternoon hours. High PW values will lead to the potential for
some heavy rain rates and flash flooding.
2. Drier air expected Wednesday through Friday behind a frontal
boundary.
3. Low chances of diurnal convection start to reappear in the
forecast as better moisture returns next weekend.
Discussion:
Diurnal convection continues early this week with afternoon MLCAPE
values approaching 2000 to 2500 J/Kg each afternoon for portions
of the area. Some of the stronger storms will be capable of
damaging winds and frequent lightning. Heavy rain rates will also
be a primary concern as PW values increase to near 2.2 inches
which will result in flash flooding chances across the region.
Some areas could see some 3 to 4+ inch per hour rain rates in the
heaviest downpours.
Shortwave trough moves east of the region Tuesday night as a
front moves southeast across the region. Subsidence and drier air
build in from the northwest on Wednesday and Thursday with mostly
dry conditions expected area-wide. Low chances of rain and
thunderstorms will continue on Wednesday across our far southern
areas close to the front.
As moisture begins to increase and the ridge weakens next weekend,
chances of standard summer-time diurnal convection begin to
increase once again.
&&
.AVIATION...
(06Z TAFS)
Issued at 1258 AM EDT Sun Jun 29 2025
VFR conditions forecast to prevail with VCFG tonight near all
sites. Some fog impacts are most likely at TRI early this morning
prior to clearing out by 14z. VCSH and Prob30 thunderstorm chances
are expected after 19z with the highest chances for thunderstorm
impacts at CHA.
&&
.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN 90 72 88 72 / 50 30 80 50
Knoxville McGhee Tyson Airport, TN 90 71 89 72 / 50 30 80 60
Oak Ridge, TN 89 70 87 71 / 50 30 80 60
Tri Cities Airport, TN 88 68 87 70 / 60 30 70 60
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.
&&
$$
SHORT TERM...JB
LONG TERM....JB
AVIATION...JB
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