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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: 6:51 am CDT Sep 27, 2026 |
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Today
 Chance Showers then Mostly Cloudy
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Tonight
 Mostly Cloudy
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Monday
 Sunny
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Monday Night
 Mostly Clear
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Tuesday
 Mostly Sunny
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Tuesday Night
 Mostly Cloudy
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Wednesday
 Slight Chance Showers
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Wednesday Night
 Chance Showers
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Thursday
 Showers Likely
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| Hi 74 °F |
Lo 57 °F |
Hi 78 °F |
Lo 56 °F |
Hi 82 °F |
Lo 66 °F |
Hi 85 °F |
Lo 69 °F |
Hi 80 °F |
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Today
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A 50 percent chance of showers, mainly before 10am. Mostly cloudy, with a high near 74. Light and variable wind. |
Tonight
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Mostly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening. |
Monday
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Sunny, with a high near 78. Light northeast wind. |
Monday Night
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Mostly clear, with a low around 56. Calm wind. |
Tuesday
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Mostly sunny, with a high near 82. South wind 3 to 8 mph. |
Tuesday Night
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Mostly cloudy, with a low around 66. |
Wednesday
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A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 85. |
Wednesday Night
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A 40 percent chance of showers, mainly after 1am. Cloudy, with a low around 69. |
Thursday
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Showers likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%. |
Thursday Night
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Showers likely and possibly a thunderstorm. Cloudy, with a low around 65. Chance of precipitation is 60%. |
Friday
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A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 76. |
Friday Night
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A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62. |
Saturday
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A 40 percent chance of showers. Partly sunny, with a high near 73. |
Forecast from NOAA-NWS
for 3 Miles NNW Black Jack MO.
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Weather Forecast Discussion
563
FXUS63 KLSX 271103
AFDLSX
Area Forecast Discussion
National Weather Service St Louis MO
603 AM 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 SATURDAY/...
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 /06Z TAFS THROUGH 12Z MONDAY/...
Issued at 558 AM CDT Sun Sep 27 2026
Intermittent light showers will affect the terminals through
14-15Z, with UIN the most likely (60% chance) to be affected.
This is the airport which is most likely to see any MVFR
conditions with the rain. Chances will drop off quickly after
15Z with mainly dry and VFR conditions there afternoon. Winds
are expected to be mainly light and variable through the period.
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&
$$
SHORT TERM...Jaja
LONG TERM...Jaja
AVIATION...Britt
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