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Old Jamestown, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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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 19, 2026 |
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This Afternoon
 Hot
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Tonight
 Partly Cloudy
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Sunday
 Mostly Sunny then Chance Showers
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Sunday Night
 Showers Likely
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Monday
 Showers Likely
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Monday Night
 Chance Showers
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Tuesday
 Mostly Cloudy
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Tuesday Night
 Mostly Cloudy
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Wednesday
 Mostly Sunny
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| Hi 98 °F |
Lo 75 °F |
Hi 93 °F |
Lo 68 °F |
Hi 80 °F |
Lo 61 °F |
Hi 72 °F |
Lo 56 °F |
Hi 74 °F |
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Heat Advisory
This Afternoon
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Partly sunny and hot, with a high near 98. West wind 6 to 8 mph. |
Tonight
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Partly cloudy, with a low around 75. South wind 3 to 6 mph. |
Sunday
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A chance of showers between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 93. West wind 3 to 7 mph. Chance of precipitation is 30%. |
Sunday Night
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Showers and thunderstorms likely, mainly before 10pm, then showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 68. North wind 7 to 10 mph becoming northeast in the evening. Chance of precipitation is 70%. |
Monday
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Showers likely and possibly a thunderstorm before 7am, then showers likely between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Northeast wind 7 to 9 mph. Chance of precipitation is 60%. |
Monday Night
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A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 61. |
Tuesday
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Mostly cloudy, with a high near 72. |
Tuesday Night
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Mostly cloudy, with a low around 56. |
Wednesday
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Mostly sunny, with a high near 74. |
Wednesday Night
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Partly cloudy, with a low around 56. |
Thursday
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Partly sunny, with a high near 76. |
Thursday Night
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A 20 percent chance of showers. Mostly cloudy, with a low around 60. |
Friday
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A 20 percent chance of showers. Partly sunny, with a high near 79. |
Forecast from NOAA-NWS
for 3 Miles NNW Black Jack MO.
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Weather Forecast Discussion
079
FXUS63 KLSX 191734
AFDLSX
Area Forecast Discussion
National Weather Service St Louis MO
1234 PM CDT Sat Sep 19 2026
.KEY MESSAGES...
- Summer-like heat continues today with relief from a cold front
starting Sunday.
- More widespread showers and thunderstorms are expected Sunday
night into Monday.
&&
.SHORT TERM /THROUGH SUNDAY/...
Issued at 343 AM CDT Sat Sep 19 2026
An upper level ridge continues to reside over the central CONUS,
which has been the driver behind the heat and humidity lately.
The front that brought some subtle heat relief to northern areas
and spotty showers and thunderstorms has retreated north,
allowing the hot and humid air mass to return over the entire
forecast area today. Ensemble guidance indicates that 850mb
temperatures are 21-22 degrees C (>95th percentile of
climatology) translating to mid to upper 90s surface
temperatures in full mixing. With deeper mixing, dewpoints are
expected to be lower in the mid to upper 60s leading to lower
heat index values around 100 across the region. An upper level
tough that is currently over the western CONUS will move to the
east through the day today and into Sunday, eventually pushing a
cold front into our area beginning Sunday. Temperatures on
Sunday will still be hot and humid south of the front as it
begins to push through the region. This will lower high
temperatures into the 80s in northern MO, while southeastern MO
will remain in the 90s. However, modest humidity will prevent
more widespread 100+ heat index values. As a result no changes
are being made to the Heat Advisory as it aligns well with the
forecast.
The low-level jet is expected to develop some showers and
thunderstorms in eastern KS overnight tonight, but are expected
to significantly weaken by the time they reach central MO. HREF
guidance shows that there is about a 10-40% chance that some
convective remnants could translate through northeastern MO.
Otherwise, today and Sunday are looking to remain dry.
&&
.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Issued at 343 AM CDT Sat Sep 19 2026
The light at the end of this hot tunnel is in sight. Cluster
analysis continues to show uncertainty on the speed of the front
with much cooler temperatures behind it. The relief will begin
in northern MO on Sunday during the day and is expected to be
completely through the area by Tuesday. Current NBM guidance
interquartile range for the high temperatures on Monday reaches
10 degrees due to the uncertainty in the fronts exact position
and speed. Behind the front temperatures are expected to be much
cooler, and latest NBM guidance continues to trend cooler than
previous days. For example, NBM has dropped Tuesday max
temperature forecasts around 8 degrees over the last 48 hours,
now with highs only in the upper 60s to low 70s. This air mass
will dominate for the rest of the week with a gradual warming
through the 70s.
The highest chance for showers and thunderstorms in the next
week will be Sunday night into Monday morning behind the cold
front. While the confidence is low on the exact timing and
location of this convection, there is a 60-80% chance across the
region of measurable rainfall during this period, and 30-60%
chance of seeing 0.25 inches of rain.
&&
.AVIATION /18Z TAFS THROUGH 00Z MONDAY/...
Issued at 1230 PM CDT Sat Sep 19 2026
A weak mid-level disturbance is drifting east of the Mississippi
River, resulting in isolated showers/thunderstorms. Activity is
expected to remain east of the terminals and therefore have not
been included in the latest TAF package.
With exception to KUIN, all terminals are expected remain VFR
with an increase in cloud cover tonight into Sunday. As the
front drifts toward KUIN Sunday morning, precipitation tracks
west to east ahead of the southward-moving front. MVFR
potential increases through the later portion of the TAF period
at KUIN with an isolated thunderstorm possible. For now, -SHRA
was included with minor vsby reduction within showers. The
remainder of the sites are largely free of precipitation with
isolated precipitation during the afternoon, preceding the
front. Potential for direct impacts is low until the boundary
approaches the remainder of the terminals late Sunday. Dry, VFR
conditions were maintained, though precipitation and MVFR
potential increase Sunday late afternoon/evening, accompanied by
veering winds along and behind the front.
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 8 PM CDT this evening for MOZ047>049-
059>065-072>075-084-085-099.
IL...Heat Advisory until 8 PM CDT this evening for ILZ064-069-070-
074-079-100>102.
&&
$$
SHORT TERM...Asel/Kimble
LONG TERM...Asel/Kimble
AVIATION...Maples
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