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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: 10:22 am CST Feb 11, 2026
 
Today

Today: Sunny, with a high near 51. Northwest wind 3 to 6 mph.
Sunny

Tonight

Tonight: Partly cloudy, with a low around 33. Calm wind.
Partly Cloudy

Thursday

Thursday: Mostly cloudy, with a high near 52. Calm wind becoming south around 6 mph in the afternoon.
Mostly Cloudy

Thursday
Night
Thursday Night: Mostly cloudy, with a low around 33. Southeast wind 3 to 6 mph.
Mostly Cloudy

Friday

Friday: Mostly sunny, with a high near 56. South wind 3 to 6 mph.
Mostly Sunny

Friday
Night
Friday Night: Mostly cloudy, with a low around 38.
Mostly Cloudy

Saturday

Saturday: A 30 percent chance of rain, mainly after noon.  Mostly cloudy, with a high near 53.
Chance Rain

Saturday
Night
Saturday Night: A 40 percent chance of rain.  Partly cloudy, with a low around 41.
Chance Rain

Sunday

Sunday: A 20 percent chance of rain before noon.  Mostly sunny, with a high near 57.
Slight Chance
Rain then
Mostly Sunny
Hi 51 °F Lo 33 °F Hi 52 °F Lo 33 °F Hi 56 °F Lo 38 °F Hi 53 °F Lo 41 °F Hi 57 °F

 

Today
 
Sunny, with a high near 51. Northwest wind 3 to 6 mph.
Tonight
 
Partly cloudy, with a low around 33. Calm wind.
Thursday
 
Mostly cloudy, with a high near 52. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
 
Mostly cloudy, with a low around 33. Southeast wind 3 to 6 mph.
Friday
 
Mostly sunny, with a high near 56. South wind 3 to 6 mph.
Friday Night
 
Mostly cloudy, with a low around 38.
Saturday
 
A 30 percent chance of rain, mainly after noon. Mostly cloudy, with a high near 53.
Saturday Night
 
A 40 percent chance of rain. Partly cloudy, with a low around 41.
Sunday
 
A 20 percent chance of rain before noon. Mostly sunny, with a high near 57.
Sunday Night
 
Mostly clear, with a low around 38.
Washington's Birthday
 
Mostly sunny, with a high near 60.
Monday Night
 
Mostly cloudy, with a low around 46.
Tuesday
 
Mostly cloudy, with a high near 65.

 

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

Weather Forecast Discussion
207
FXUS63 KLSX 111716
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1116 AM CST Wed Feb 11 2026

.KEY MESSAGES...

- Rain approaches the region by late Saturday morning with
  widespread precipitation Saturday afternoon through early Sunday
  morning. Rain chances are highest south of I-70 (up to 60%).

- Temperatures gradually warm through the week with well above
  normal temperatures (widespread 60s) favored by the end of the
  period.


&&

.SHORT TERM...  (Through Late Thursday Afternoon)
Issued at 313 AM CST Wed Feb 11 2026

The mean upper-level pattern features zonal flow, while at the
surface, high pressure is centered over the central Plains as low
pressure passes eastward over Arkansas. This surface low is tracking
along a cold front that moved through yesterday and currently
resides over southern Missouri and Illinois. Mid to high clouds
extend north of the boundary to I-70, but deeper moisture remains to
the south, keeping conditions dry through the pre-dawn hours.

Over the next 24 hours, surface high pressure will build into the
Mississippi Valley, leading to mostly clear skies. Despite the
sunshine, high temperatures will be limited by northerly surface
flow and continued cold air advection around the eastern side of the
surface ridge. NBM IQR values are tightly clustered in the upper
40s to low 50s for high temperatures today.

By late tonight, the ridge will build into the region ahead of
modest ridge amplification over the Plains, with light and variable
flow eventually backing out of the southeast on Thursday. The
southerly flow component, while mild, is not expected to cause a
significant warm-up, but rather maintain mild temperatures. This is
well represented in 850MB temperatures, with a nearly stationary 0C
isotherm hugging eastern Missouri through Thursday. Additionally,
700MB saturation will increase cloud cover over the region,
effectively limiting solar insolation, and keeping Thursdays
temperatures nearly identical to todays (magnitude and
distribution).

Maples

&&

.LONG TERM...  (Thursday Night through Tuesday)
Issued at 313 AM CST Wed Feb 11 2026

By Friday, a broad mid-level ridge will encompass the southeastern
U.S., drawing milder air northward through the Plains. This will
provide the eastward push necessary to clear sub-zero 850MB
temperatures from the region. Mid-level moisture and cloud cover
will increase late in the day, allowing temperatures to improve
upon Thursdays highs. With 3-5 degrees of mid-level warming
expected, highs should reach the 50s across most of the CWA, with
some low 60s near the Ozarks.

The primary chance for rain is centered on late Saturday into early
Sunday. Rain chances (40%) arrive in central and southeast
Missouri by mid-to-late morning, while the rest of the area should
remain dry until the afternoon. While overall trends have shifted
south, the latest GFS deterministic guidance has adjusted
slightly northward and further west. I am hesitant to rely on a
single run and continue to favor southward trends, as the best
mid/upper level lift is currently positioned over southern
Missouri and northern Arkansas. Significant rainfall is expected
to stay along and south of I-70, where ascent is maximized. Areas
in the far northern CWA may miss out on much of this
precipitation.

Latest LREF totals show a notable spread, with approximately 0.50
forecasted along I-70 and higher amounts toward southern Missouri
and Illinois. The 25th percentile suggests less than 0.05 near
I-70, while the 75th percentile sits around 0.40-0.50. Given these
spreads, further adjustments to the QPF are likely. Saturday
morning currently looks dry for most, with rain chances increasing
through the afternoon and exiting early Sunday morning.

NBM temperature spreads increase to roughly 10 degrees for the
remainder of the period. As the upper low departs, ridge
amplification will bring even milder air into the region.
Currently, the deterministic NBM undercuts the 25th percentile
(upper 60s); if this trend persists, we may see warmer
temperatures heading into next week.


Maples

&&

.AVIATION...  (For the 18z TAFs through 18z Thursday Afternoon)
Issued at 1113 AM CST Wed Feb 11 2026

VFR conditions are expected throughout the 18Z TAF period. Very
light and variable winds can be expected throughout the day and
overnight tonight, but will increase very slightly to
southeasterly near the end of the period tomorrow. Steadily
increasing high and mid level cloud cover is also expected
overnight through tomorrow afternoon. Some virga will also be
possible near the end of the period, but chances for surface
precipitation remain low (less than 20%).

BRC

&&

.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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