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Old Jamestown, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for 3 Miles NNW Black Jack MO
National Weather Service Forecast for: 3 Miles NNW Black Jack MO
Issued by: National Weather Service Saint Louis, MO
Updated: 6:56 pm CDT Jul 27, 2026
 
Tonight

Tonight: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight.  Partly cloudy, with a low around 80. Southwest wind around 7 mph becoming west after midnight.  Chance of precipitation is 20%.
Slight Chance
T-storms then
Mostly Clear
Tuesday

Tuesday: Isolated showers and thunderstorms after 1pm.  Partly sunny, with a high near 89. Northwest wind 7 to 9 mph becoming north in the afternoon.  Chance of precipitation is 20%.
Mostly Sunny
then Isolated
T-storms
Tuesday
Night
Tuesday Night: Isolated showers and thunderstorms before midnight.  Mostly cloudy, then gradually becoming mostly clear, with a low around 70. Northeast wind 3 to 8 mph.  Chance of precipitation is 20%.
Isolated
T-storms then
Partly Cloudy
Wednesday

Wednesday: Sunny, with a high near 87. Northeast wind 3 to 8 mph.
Sunny

Wednesday
Night
Wednesday Night: Clear, with a low around 69. Northeast wind 5 to 7 mph becoming calm  in the evening.
Clear

Thursday

Thursday: Sunny, with a high near 88.
Sunny

Thursday
Night
Thursday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 71.
Partly Cloudy
then Slight
Chance
T-storms
Friday

Friday: A chance of showers, with thunderstorms also possible after 1pm.  Mostly cloudy, with a high near 85. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
Friday
Night
Friday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Showers
Likely

Lo 80 °F Hi 89 °F Lo 70 °F Hi 87 °F Lo 69 °F Hi 88 °F Lo 71 °F Hi 85 °F Lo 70 °F

Heat Advisory
 

Tonight
 
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Partly cloudy, with a low around 80. Southwest wind around 7 mph becoming west after midnight. Chance of precipitation is 20%.
Tuesday
 
Isolated showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Northwest wind 7 to 9 mph becoming north in the afternoon. Chance of precipitation is 20%.
Tuesday Night
 
Isolated showers and thunderstorms before midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 70. Northeast wind 3 to 8 mph. Chance of precipitation is 20%.
Wednesday
 
Sunny, with a high near 87. Northeast wind 3 to 8 mph.
Wednesday Night
 
Clear, with a low around 69. Northeast wind 5 to 7 mph becoming calm in the evening.
Thursday
 
Sunny, with a high near 88.
Thursday Night
 
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Friday
 
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 85. Chance of precipitation is 50%.
Friday Night
 
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Saturday
 
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Saturday Night
 
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Sunday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Sunday Night
 
Mostly clear, with a low around 69.
Monday
 
Sunny, with a high near 85.

 

Forecast from NOAA-NWS for 3 Miles NNW Black Jack MO.

Weather Forecast Discussion
756
FXUS63 KLSX 272306
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
606 PM CDT Mon Jul 27 2026

.KEY MESSAGES...

- One last day with dangerous heat and humidity is forecast on
  Tuesday along/south of I-70.

- A few strong to severe storms are possible with damaging through
  late this evening in parts of south-central Illinois.

- Widespread heat relief is expected by Wednesday, with near
  normal temperatures through the end of the work week.

&&

.SHORT TERM /THROUGH TUESDAY NIGHT/...
Issued at 239 PM CDT Mon Jul 27 2026

Dangerous heat and humidity remains the main story today with
temperatures climbing well into the mid 90s as of 2 PM. A few
spots today may touch the century mark. Dewpoints are still
unseasonably high as well (~90th percentile), though are an
improvement compared to yesterday. Heat index values are mostly
in the 105-110F range, and may come up another couple of degrees
later this afternoon.

Chances of showers and thunderstorms is the next concern through
this evening. Ongoing severe convection near and just southeast of
Chicago should continue to move south/southeast and stay away from
our region. There have been some subtle signs at development farther
west into western Illinois over the past 1-2 hours. GOES-19 also is
showing a westward-propagating gravity wave, which could also impact
convective initiation over the next 1-2 hours. IF storms can develop
and strengthen, they may clip our south-central Illinois counties
this evening. Damaging winds would be the main threat if any storms
move into our region. Finally, there is some weaker elevated
convection as far west as the Missouri River near the NE/IA border.
These storms have been on/off nearly all day and have never been
able to move much southeast due to strong capping. The expectation
is for this cap to continue to help shield central/northeast
Missouri from these storms making it into the area.

The synoptic cold front is expected to move southward slowly
overnight tonight through Tuesday morning. This boundary may help
serve the focus for a few isolated (weaker) thunderstorms with as a
weak low-level jet strengthens overnight. A better chance (30%) of
showers and a few storms comes late morning through the evening
hours on Tuesday as a midlevel shortwave trough ejects out of the
mid-Missouri Valley. This activity looks to be behind the synoptic
cold front and elevated in nature. Strong to severe storms are
therefore not likely as the threat for damaging winds with elevated
convection is quite low and chances of severe hail making it to the
surface also very low.

Dangerous heat/humidity remains a top concern on Tuesday, though the
threat area will shift more to the south and out of areas north of I-
70. Lingering high dewpoints though north of the cold front will
still make it feel like 100-105+ for those along/south of I-70.
Where 105+ values are expected once again, continued the heat
warning another day with an advisory to the north for locations
where peak heat index values of 100-105F are forecast.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Issued at 239 PM CDT Mon Jul 27 2026

Dry weather with near normal temperatures is forecast Wednesday
through Thursday thanks in part due to a weak ridge of surface high
pressure across the area. We are still looking for a good chance (50-
70%) of showers and thunderstorms from a potential MCS Thursday
night - Friday night. Ensemble guidance has shifted a bit more
toward a slower midlevel trough passage this weekend, with a
minority (23%) of members from the LREF showing a cutoff midlevel
low. This means a couple of things, but namely: 1) cooler daytime
temperatures Friday through next weekend and 2) lingering rain
chances.

&&

.AVIATION /00Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 604 PM CDT Mon Jul 27 2026

Main concern for the TAFs is the presence of a few thunderstorms
in the next few hours in the vicinity of St Louis. These should
roll through within the next 2-3 hours with little expected
after. Winds turn northerly behind a cold front that drops north
to south across the region tomorrow. Additional showers and
storms are possible along the front, but confidence is low on
where that will occur. So for now we have not mentioned RA or TS
at any TAF, but this may change if confidence improves.

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Extreme Heat Warning until 9 PM CDT this evening for MOZ018-
     019-026-027-034>036-041-042-047>052-059>064.
     Heat Advisory until 7 PM CDT Tuesday for MOZ041-047>052-
     059>064.
     Extreme Heat Warning until 7 PM CDT Tuesday for MOZ065-072>075-
     084-085-099.
IL...Extreme Heat Warning until 9 PM CDT this evening for
     ILZ058>060-064-065-069-070-095>100.
     Heat Advisory until 7 PM CDT Tuesday for ILZ064-069-070-100.
     Extreme Heat Warning until 7 PM CDT Tuesday for ILZ074-079-101-
     102.

&&

$$

SHORT TERM...Gosselin
LONG TERM...Gosselin
AVIATION...Kimble
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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