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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: 11:16 pm CDT Aug 22, 2026
 
Overnight

Overnight: Mostly clear, with a low around 64. Light northwest wind.
Mostly Clear
Sunday

Sunday: Increasing clouds, with a high near 82. Northwest wind 3 to 8 mph.
Increasing
Clouds
Sunday
Night
Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 62. North wind around 6 mph becoming calm  in the evening.
Decreasing
Clouds
Monday

Monday: Mostly sunny, with a high near 83. East wind 3 to 5 mph.
Mostly Sunny
Monday
Night
Monday Night: A slight chance of showers and thunderstorms.  Partly cloudy, with a low around 66. Southeast wind 3 to 6 mph.  Chance of precipitation is 20%.
Slight Chance
T-storms
Tuesday

Tuesday: Mostly sunny, with a high near 85.
Mostly Sunny
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 69.
Partly Cloudy
Wednesday

Wednesday: Mostly sunny, with a high near 88.
Mostly Sunny
Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 69.
Partly Cloudy
Lo 64 °F Hi 82 °F Lo 62 °F Hi 83 °F Lo 66 °F Hi 85 °F Lo 69 °F Hi 88 °F Lo 69 °F

 

Overnight
 
Mostly clear, with a low around 64. Light northwest wind.
Sunday
 
Increasing clouds, with a high near 82. Northwest wind 3 to 8 mph.
Sunday Night
 
Mostly cloudy, then gradually becoming mostly clear, with a low around 62. North wind around 6 mph becoming calm in the evening.
Monday
 
Mostly sunny, with a high near 83. East wind 3 to 5 mph.
Monday Night
 
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.
Tuesday
 
Mostly sunny, with a high near 85.
Tuesday Night
 
Partly cloudy, with a low around 69.
Wednesday
 
Mostly sunny, with a high near 88.
Wednesday Night
 
Partly cloudy, with a low around 69.
Thursday
 
Sunny, with a high near 87.
Thursday Night
 
Mostly clear, with a low around 67.
Friday
 
Sunny, with a high near 86.
Friday Night
 
Partly cloudy, with a low around 69.
Saturday
 
Mostly sunny, with a high near 88.

 

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

Weather Forecast Discussion
801
FXUS63 KLSX 230533
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
1233 AM CDT Sun Aug 23 2026

.KEY MESSAGES...

- Pleasant and mostly dry conditions are expected through the
  upcoming week.

&&

.SHORT TERM /THROUGH MONDAY/...
Issued at 230 PM CDT Sat Aug 22 2026

Northwest flow continues aloft across the region. A ridge is
bringing hot weather out west while a trough over the Great
Lakes is bringing considerably cooler weather in the east. At
the surface, high pressure is pushing south into the Northern
Plains, with winds out of the north across our region bringing
in drier air. As this high nudges further south overnight we`ll
see winds die off and temperatures drop in the fresh dry air
mass. Lows tonight will dip into the low to mid 60s, with some
upper 50s possible in the cooler spots. Sunday will be one of
the coolest days of this air mass with highs only reaching into
the low 80s. Some mid and high level cloud cover will contribute
to those lower temperatures.

&&

.LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
Issued at 230 PM CDT Sat Aug 22 2026

This week we continue in some flavor of western ridging and
eastern troughing, keeping our area in the northwest flow in
between. Showers and thunderstorms rotating around the ridge
stay largely west of our area, keeping us mainly dry through
Tuesday with temperatures eventually making a modest rebound
back into the mid to upper 80s.

The initial eastern trough weakens and lifts into the Canadian
Maritimes by midweek, but it gets replaced by a new trough
arriving from around the top of the ridge. It`s this trough
that`s probably the most interesting feature for our weather
this week. It initially arrives in the Pacific Northwest
tomorrow but moves into the western Great Lakes on Wednesday. As
it does so, it will slide another cold front southward through
the middle of the country, pushing through our area Wednesday or
Wednesday night. This represents our best chance of rain this
week, though those chances aren`t particularly high at this
point. Most of the forcing from the trough passes by to our
north while the better moisture and instability remains further
south. NBM PoP remains quite low, generally 20 percent or less,
but if we look at the low resolution ensemble guidance we see
that 50 to 60 percent of these members produce measurable rain
in the 24 hours ending Wednesday night. It`s the timing and
location uncertainty that`s holding PoP lower at this point, but
this does represent our best chance of rain locally this week.

Wednesday`s front may knock temperatures back a few degrees, but
guidance is in general agreement that the western ridge weakens
and broadens later in the week, nudging its influence eastward.
This would nudge us back toward warmer temperatures, but not as
extreme as we`ve seen recently. We`ll also have a few other
opportunities for rain as shortwave troughs round the edge of
the ridge even as it approaches our area. However, confidence
in the timing and track of those waves is even lower than for
Wednesday`s trough, so daily rain chances remain fairly minimal
in the current forecast until that confidence changes.

&&

.AVIATION /06Z TAFS THROUGH 12Z MONDAY/...
Issued at 1229 AM CDT Sun Aug 23 2026

VFR flight conditions and light northwest flow is expected to
prevail through Sunday. There will likely be some river fog
again Monday morning which will locally reduce the visibility
to 1SM or less. Any fog that develops should dissipate quickly
after sunrise. Winds will become light and variable late Monday
afternoon, and then turn to the south-southeast across Missouri
in the evening as high pressure drifts into Illinois and
Indiana.

&&

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

&&

$$

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






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