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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: 2:11 am CDT Jul 1, 2026
 
Overnight

Overnight: Clear, with a low around 78. South wind around 7 mph.
Clear

Wednesday

Wednesday: Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 5 to 8 mph.
Hot

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 79. South wind 5 to 9 mph.
Mostly Clear

Thursday

Thursday: Sunny and hot, with a high near 97. Heat index values as high as 106. Southwest wind 3 to 6 mph.
Hot

Thursday
Night
Thursday Night: Mostly clear, with a low around 79. South wind 5 to 7 mph becoming calm  after midnight.
Mostly Clear

Friday

Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 96.
Sunny then
Slight Chance
T-storms
Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 77.
Partly Cloudy
then Slight
Chance
T-storms
Independence
Day
Independence Day: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 95.
Mostly Sunny
then Chance
T-storms
Saturday
Night
Saturday Night: A 30 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 76.
Partly Cloudy
then Chance
T-storms
Lo 78 °F Hi 97 °F Lo 79 °F Hi 97 °F Lo 79 °F Hi 96 °F Lo 77 °F Hi 95 °F Lo 76 °F

Extreme Heat Warning
 

Overnight
 
Clear, with a low around 78. South wind around 7 mph.
Wednesday
 
Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 5 to 8 mph.
Wednesday Night
 
Mostly clear, with a low around 79. South wind 5 to 9 mph.
Thursday
 
Sunny and hot, with a high near 97. Heat index values as high as 106. Southwest wind 3 to 6 mph.
Thursday Night
 
Mostly clear, with a low around 79. South wind 5 to 7 mph becoming calm after midnight.
Friday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Friday Night
 
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77.
Independence Day
 
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95.
Saturday Night
 
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 76.
Sunday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Monday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Monday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Tuesday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

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

Weather Forecast Discussion
048
FXUS63 KLSX 010317
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1017 PM CDT Tue Jun 30 2026

.KEY MESSAGES...

- Dangerous heat and humidity are expected through at least Friday,
  with confidence low to medium in these conditions continuing
  through the holiday weekend.

- The threat of isolated to scattered showers and thunderstorms
  gradually increases Thursday through Sunday.


&&

.SHORT TERM...  (Through Late Wednesday Night)
Issued at 232 PM CDT Tue Jun 30 2026

Highly amplified upper-level ridging continues to encompass much of
the eastern CONUS per water vapor imagery, with little to no change
in the regional surface pattern from days past. Surface winds are
more southwesterly today than as of late, which is expected to give
temperatures a minor boost this afternoon thanks to downsloping
off of the Ozarks. However, this will also nudge dew points down
slightly, making it a wash when it comes to area heat index
values. Values around 105 degrees are expected this afternoon.
With the upper-levels and surface pattern remaining relatively
stagnant through tomorrow, similar conditions are expected.

Elmore

&&

.LONG TERM...  (Thursday through Next Tuesday)
Issued at 232 PM CDT Tue Jun 30 2026

The consensus among both deterministic and ensemble guidance is that
the upper-level ridge will gradually breakdown and flatten through
the weekend. In response, temperatures at 850mb will slowly cool,
with surface temperatures following a similar trend. With the low to
mid-level temperatures cooling, capping will be less of an issue,
allowing for daily chances for convection to return starting on
Thursday. However, the convective signal in courser guidance
Thursday-Saturday may be too strong and the result of the guidance
over-convecting. The 06z and 12z GFS are examples of this occurring
over our CWA, and this is most likely over-inflating the PoPs from
the NBM especially on Friday and Saturday. A majority of
deterministic soundings show surface temperatures coming within a
degree or two of convective temperatures through this portion of the
period, and when coupled with the cooling aloft, does support a low
chance for isolated to scattered convection during peak heating
Thursday-Saturday. More locations will remain dry than see
rainfall each afternoon. Rain chances increase Saturday night
through Monday as a weak front sinks into the Middle Mississippi
Valley; though, details on the timing of this front are highly
variant among guidance thanks to weak forcing from quazi-zonal
flow aloft.

With the ridge weakening and low to mid-level temperatures cooling,
we`ll experience a gradual reprieve from the heat as we move into
the holiday weekend and early next week. By how much and how quickly
still remains uncertain, as the degree to which the ridge weakens
varies enough that the interquartile range of ensemble guidance is 5
degrees for high temperatures Saturday onward. While this isn`t a
large spread for this lead time, it is enough to still question
whether heat headlines will need to be continued into the weekend.
Even if heat headlines aren`t needed, conditions will still be very
summer-like, with air mass convection providing a low chance for
localized, brief breaks from the heat. The aforementioned front, how
quickly it moves into and through the area, increases uncertainty in
high temperatures even more for Sunday through Tuesday.

Elmore

&&

.AVIATION...  (For the 06z TAFs through 06z Wednesday Night)
Issued at 1016 PM CDT Tue Jun 30 2026

Dry and VFR conditions are expected through the period with south
to southwesterly winds at 5 to 10 knots.

Britt

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Extreme Heat Warning until 10 PM CDT Friday for Audrain MO-Boone
     MO-Callaway MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO-
     Iron MO-Jefferson MO-Knox MO-Lewis MO-Lincoln MO-Madison MO-
     Marion MO-Moniteau MO-Monroe MO-Montgomery MO-Osage MO-Pike
     MO-Ralls MO-Reynolds MO-Saint Charles MO-Saint Francois MO-
     Saint Louis City MO-Saint Louis MO-Sainte Genevieve MO-
     Shelby MO-Warren MO-Washington MO.

IL...Extreme Heat Warning until 10 PM CDT Friday for Adams IL-Bond IL-
     Brown IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-Jersey
     IL-Macoupin IL-Madison IL-Marion IL-Monroe IL-Montgomery IL-
     Pike IL-Randolph IL-Saint Clair IL-Washington IL.

&&

$$

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






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