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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: 7:35 am CDT May 6, 2026
 
Today

Today: Cloudy, then gradually becoming mostly sunny, with a high near 61. Northwest wind 6 to 9 mph.
Decreasing
Clouds

Tonight

Tonight: Mostly clear, with a low around 43. Light north wind.
Mostly Clear

Thursday

Thursday: Partly sunny, then gradually becoming sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the afternoon.
Becoming
Sunny

Thursday
Night
Thursday Night: Clear, with a low around 48. South wind 5 to 7 mph.
Clear

Friday

Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 75. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Sunny then
Slight Chance
T-storms
Friday
Night
Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am.  Partly cloudy, with a low around 52. Chance of precipitation is 50%.
Chance
T-storms then
Chance
Showers
Saturday

Saturday: Sunny, with a high near 81.
Sunny

Saturday
Night
Saturday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am.  Partly cloudy, with a low around 58.
Slight Chance
T-storms then
Chance
T-storms
Sunday

Sunday: A 30 percent chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 71.
Chance
T-storms

Hi 61 °F Lo 43 °F Hi 66 °F Lo 48 °F Hi 75 °F Lo 52 °F Hi 81 °F Lo 58 °F Hi 71 °F

Hazardous Weather Outlook
 

Today
 
Cloudy, then gradually becoming mostly sunny, with a high near 61. Northwest wind 6 to 9 mph.
Tonight
 
Mostly clear, with a low around 43. Light north wind.
Thursday
 
Partly sunny, then gradually becoming sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the afternoon.
Thursday Night
 
Clear, with a low around 48. South wind 5 to 7 mph.
Friday
 
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Friday Night
 
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 52. Chance of precipitation is 50%.
Saturday
 
Sunny, with a high near 81.
Saturday Night
 
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 58.
Sunday
 
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71.
Sunday Night
 
Partly cloudy, with a low around 49.
Monday
 
Sunny, with a high near 72.
Monday Night
 
A 20 percent chance of showers. Mostly clear, with a low around 52.
Tuesday
 
A 20 percent chance of showers. Mostly sunny, with a high near 79.

 

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

Weather Forecast Discussion
631
FXUS63 KLSX 061112
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
612 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 12z TAFs through 12z Thursday Morning)
Issued at 610 AM CDT Wed May 6 2026

The light rainfall that has been plaguing the terminals overnight
is finally winding down, with dry conditions expected shortly
after the start of the TAF period onward. While skies will remain
cloudy through the day, ceilings are expected to remain VFR thanks
to north-northwesterly winds pushing drier air into the region.

Elmore

&&

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

$$

WFO LSX
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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