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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: 1:26 pm CDT Sep 27, 2026
 
This
Afternoon
This Afternoon: Mostly cloudy, with a high near 73. Light northeast wind.
Mostly Cloudy

Tonight

Tonight: Mostly cloudy, with a low around 56. North wind around 5 mph becoming calm  in the evening.
Mostly Cloudy

Monday

Monday: Partly sunny, then gradually becoming sunny, with a high near 78. Light northeast wind.
Becoming
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 56. Calm wind.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 83. South wind 3 to 7 mph.
Sunny

Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 66.
Mostly Cloudy

Wednesday

Wednesday: Partly sunny, with a high near 88.
Partly Sunny

Wednesday
Night
Wednesday Night: A 20 percent chance of showers after 1am.  Mostly cloudy, with a low around 72.
Mostly Cloudy
then Slight
Chance
Showers
Thursday

Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm.  Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Showers
Likely

Hi 73 °F Lo 56 °F Hi 78 °F Lo 56 °F Hi 83 °F Lo 66 °F Hi 88 °F Lo 72 °F Hi 83 °F

 

This Afternoon
 
Mostly cloudy, with a high near 73. Light northeast wind.
Tonight
 
Mostly cloudy, with a low around 56. North wind around 5 mph becoming calm in the evening.
Monday
 
Partly sunny, then gradually becoming sunny, with a high near 78. Light northeast wind.
Monday Night
 
Mostly clear, with a low around 56. Calm wind.
Tuesday
 
Sunny, with a high near 83. South wind 3 to 7 mph.
Tuesday Night
 
Mostly cloudy, with a low around 66.
Wednesday
 
Partly sunny, with a high near 88.
Wednesday Night
 
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 72.
Thursday
 
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Thursday Night
 
Showers likely, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Friday
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 70.
Friday Night
 
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Saturday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 70.

 

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

Weather Forecast Discussion
290
FXUS63 KLSX 271730
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
1230 PM CDT Sun Sep 27 2026

.KEY MESSAGES...

- Widespread rain is forecast beginning late Tuesday and last
  through late this week. Northeast Missouri and west-central
  Illinois have the best chance at receiving higher end amounts.


- A gradual warm-up will last through the early week with most seeing
  highs in the 80s on Tuesday.

&&

.SHORT TERM /THROUGH MONDAY/...
Issued at 131 AM CDT Sun Sep 27 2026

Shower activity will decrease in coverage today as the low-level jet
dies and our once ample moisture wanes. Clouds are expected to break
up overnight from east to west, leaving portions of south-central
Illinois under mostly clear skies for the majority of the night.
Given the dry air and light winds already in place, temperatures
will be allowed to plummet under the effect of radiational cooling.
Although low-50s are forecast, some may see their first drop into
the 40s for the season. To the west where clouds will linger lows
will barely dip into the 50s. A gentle warm-up is in store for most
of the area through early this week. Given a lack of warm air
advection, today`s hop into the mid-70s can be attributed to a lack
of rain and decreasing cloud cover. Tomorrow, insolation will be the
primary driver of the 1-3 degree increase in temperature
expected.

&&

.LONG TERM /MONDAY NIGHT THROUGH SUNDAY/...
Issued at 131 AM CDT Sun Sep 27 2026

The ECMWF extreme forecast index and shift of tails show that models
have high confidence in an anomalous rainfall event impacting
Missouri later this week. With PWATs forecast near their
climatological maximum, a deep longwave trough ejecting plenty of
energy into the region, and slow moving fronts stationed nearby,
this isn`t hard to believe. Currently, ensembles and global models
place the axis of heaviest rainfall from Kansas northeast into Iowa
late Tuesday into Wednesday. This is where confidence is highest in
heavy rainfall. To the southeast, where we reside, is where
uncertainty in rainfall amounts grows. Although guidance is
consistent regarding the general pattern, there are plenty of
discrepancies model to model including location, amplitude, and
phasing of the longwave trough and therefore the footprint and
strength of low-level moisture advection. This isn`t considering the
potential for model under-dispersion of the tropical moisture
or the speed at which this moisture is used up before it reaches
our area. In short, there are multiple failure points
concerning this week`s heavy rain potential.

If it is fully realized, localized pockets of 4+" cannot be ruled
out in northeast Missouri and west-central Illinois as suggested by
the LREF 90th percentile of total precipitation ending Saturday.
Much of the soil moisture in these areas falls below the 5th
percentile of climatology, which is beneficial from a flooding
perspective. What also helps is that the rain will be falling over
multiple days, so the potential for rapidly rising water appears low
at this point. This system will continue to be closely watched as it
evolves over the coming days.

&&

.AVIATION /18Z TAFS THROUGH 00Z TUESDAY/...
Issued at 1230 PM CDT Sun Sep 27 2026

Isolated to scattered light showers continue to slide southeastward
across portions of central/northeast MO and west-central IL.
Some of these light showers are expected to impact KUIN until
20z with brief MVFR visibilities possible. A majority of the
showers in central MO should stay to the west and south of
KCOU/KJEF, with a low chance (20%) that showers impact the
terminals. Similarly, the St. Louis metro terminals have a low
10-20% chance of sn isolated shower this afternoon. Dry and VFR
flight conditions are expected areawide by later this afternoon
with light and variable winds continuing into Monday.

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.

&&

$$

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






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