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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 am CDT May 6, 2026 |
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Overnight
 Slight Chance Showers
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Wednesday
 Decreasing Clouds
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Wednesday Night
 Mostly Clear
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Thursday
 Becoming Sunny
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Thursday Night
 Clear
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Friday
 Sunny then Slight Chance T-storms
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Friday Night
 Chance Showers
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Saturday
 Sunny
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Saturday Night
 Slight Chance T-storms then Chance Rain/Freezing Rain
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| Lo 45 °F |
Hi 61 °F |
Lo 43 °F |
Hi 66 °F |
Lo 48 °F |
Hi 75 °F |
Lo 52 °F |
Hi 81 °F |
Lo 58 °F |
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Hazardous Weather Outlook
Overnight
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A 20 percent chance of showers before 4am. Mostly cloudy, with a low around 45. Calm wind. |
Wednesday
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Cloudy, then gradually becoming mostly sunny, with a high near 61. Light and variable wind becoming north around 6 mph in the afternoon. |
Wednesday Night
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Mostly clear, with a low around 43. Light north wind. |
Thursday
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Partly sunny, then gradually becoming sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the afternoon. |
Thursday Night
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Clear, with a low around 48. South wind 5 to 7 mph. |
Friday
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A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 75. Chance of precipitation is 20%. |
Friday Night
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A 50 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 52. |
Saturday
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Sunny, with a high near 81. |
Saturday Night
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A slight chance of rain showers before 1am, then a chance of rain or freezing rain. Some thunder is also possible. Partly cloudy, with a low around 58. Chance of precipitation is 50%. |
Sunday
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A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71. |
Sunday Night
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Partly cloudy, with a low around 49. |
Monday
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Sunny, with a high near 72. |
Monday Night
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A slight chance of freezing rain. Mostly clear, with a low around 52. Chance of precipitation is 20%. |
Tuesday
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A 20 percent chance of showers. Mostly sunny, with a high near 79. |
Forecast from NOAA-NWS
for 3 Miles NNW Black Jack MO.
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Weather Forecast Discussion
800
FXUS63 KLSX 060750
AFDLSX
Area Forecast Discussion
National Weather Service Saint Louis MO
250 AM CDT Wed May 6 2026
.KEY MESSAGES...
- Cooler and drier weather is forecast through Friday ahead of a weekend
warm-up.
- There will be multiple chances for showers and thunderstorms
from Friday night through Sunday. No severe weather is expected.
&&
.SHORT TERM... (Through Late Thursday Afternoon)
Issued at 249 AM CDT Wed May 6 2026
Cool and dry weather is forecast today and tomorrow behind
yesterday`s cold front. As cold air advection and persistent cloud
cover continue, temperatures today will only reach the 55 to 60
degree range for most. Clouds will thin overnight, and north winds
will become light and variable areawide. The potential for
radiational cooling paired with the cool start to the night will
allow temperatures to drop into the upper 30s and low-40s. Patchy
frost may occur (<20% chance) in valleys and sheltered areas, but
that would be the greatest extent of any frost development if it
happens at all. A slight boost in high temperatures is expected on
Thursday as skies remain mostly clear and cold air advection
continues to weaken. Highs in the 60s are forecast everywhere.
Mostly dry conditions are expected during this timeframe due to dry
post-frontal air and a lack of potent lift and forcing mechanisms.
Jaja
&&
.LONG TERM... (Thursday Night through Tuesday)
Issued at 249 AM CDT Wed May 6 2026
Multiple mid-level shortwaves are forecast to pass through the Mid-
Mississippi Valley between Friday and Sunday. Renewed Gulf moisture
along southwesterly flow will allow Friday`s shortwave to impact our
sensible weather by way of showers and thunderstorms. Despite LREF
effective shear values of 40 to 50 kts on Friday, the grand ensemble
only shows SBCAPE reaching 400 to 500 J/kg. Model soundings show an
unimpressive atmospheric profile as well. Long, skinny CAPE is not
favorable for hardy, long-lasting updrafts and unidirectional shear
does not bode well for tornadogenesis.
The strongest shortwave will arrive Sunday morning and will drive a
potent cold front through the forecast area. Showers and
thunderstorms are expected yet again with this system, again with
minimal severe potential. The greatest potential for thunderstorms
would likely be Sunday afternoon in the areas ahead of the cold
front, but a modeled large capping inversion would mitigate this.
The cold front will have an impact on the temperature forecast
between early and late this weekend. A warm-up beginning Friday will
peak on Saturday with highs reaching the 70s and 80s. Sunday`s cold
front will knock highs back into the 60s and 70s. Exact values are
still uncertain given differences in the timing of the frontal
passage. This is reflected in NBM IQR high temperature spreads of
about 10 degrees across the region. After another cool day Monday, a
warm-up is expected to carry us into the middle of next week.
Jaja
&&
.AVIATION... (For the 06z TAFs through 06z Wednesday Night)
Issued at 1157 PM CDT Tue May 5 2026
Rain will continue to shut off late tonight with dry weather
expected before sunrise. MVFR to IFR clouds will continue to shunt
south tonight, and the entire forecast area should be VFR by early
afternoon. Winds will remain mostly at or under 5 kts through the
TAF period. The prevailing wind will be from the north.
Jaja
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&
$$
WFO LSX
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