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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: 2:11 pm CST Feb 26, 2026
 
Tonight

Tonight: Clear, with a low around 38. Calm wind becoming southwest around 5 mph.
Clear

Friday

Friday: Sunny, with a high near 70. Southwest wind 5 to 13 mph, with gusts as high as 20 mph.
Sunny

Friday
Night
Friday Night: Mostly clear, with a low around 41. Southwest wind 6 to 8 mph becoming northeast after midnight.
Mostly Clear

Saturday

Saturday: A 20 percent chance of rain after noon.  Mostly sunny, with a high near 62. Northeast wind 6 to 10 mph becoming southeast in the afternoon.
Mostly Sunny
then Slight
Chance Rain
Saturday
Night
Saturday Night: Partly cloudy, with a low around 30. North wind 10 to 13 mph, with gusts as high as 20 mph.
Partly Cloudy

Sunday

Sunday: A chance of rain and snow after noon.  Mostly cloudy, with a high near 42. Chance of precipitation is 40%.
Mostly Cloudy
then Chance
Rain/Snow
Sunday
Night
Sunday Night: Rain and snow.  Low around 28. Chance of precipitation is 80%.
Rain/Snow

Monday

Monday: A slight chance of rain and snow before noon.  Mostly cloudy, with a high near 41. Chance of precipitation is 20%.
Slight Chance
Rain/Snow
then Mostly
Cloudy
Monday
Night
Monday Night: A 40 percent chance of rain, mainly after midnight.  Mostly cloudy, with a low around 31.
Chance Rain

Lo 38 °F Hi 70 °F Lo 41 °F Hi 62 °F Lo 30 °F Hi 42 °F Lo 28 °F Hi 41 °F Lo 31 °F

 

Tonight
 
Clear, with a low around 38. Calm wind becoming southwest around 5 mph.
Friday
 
Sunny, with a high near 70. Southwest wind 5 to 13 mph, with gusts as high as 20 mph.
Friday Night
 
Mostly clear, with a low around 41. Southwest wind 6 to 8 mph becoming northeast after midnight.
Saturday
 
A 20 percent chance of rain after noon. Mostly sunny, with a high near 62. Northeast wind 6 to 10 mph becoming southeast in the afternoon.
Saturday Night
 
Partly cloudy, with a low around 30. North wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday
 
A chance of rain and snow after noon. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.
Sunday Night
 
Rain and snow. Low around 28. Chance of precipitation is 80%.
Monday
 
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 41. Chance of precipitation is 20%.
Monday Night
 
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 31.
Tuesday
 
Rain likely, mainly before noon. Cloudy, with a high near 45. Chance of precipitation is 60%.
Tuesday Night
 
Rain likely. Cloudy, with a low around 38. Chance of precipitation is 60%.
Wednesday
 
Rain likely. Cloudy, with a high near 56. Chance of precipitation is 60%.
Wednesday Night
 
Rain likely. Cloudy, with a low around 48. Chance of precipitation is 70%.
Thursday
 
Rain likely. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.

 

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

Weather Forecast Discussion
969
FXUS63 KLSX 262054
AFDLSX

Area Forecast Discussion
National Weather Service Saint Louis MO
254 PM CST Thu Feb 26 2026

.KEY MESSAGES...

- Low relative humidity and gusty winds will lead to widespread Elevated
  Fire Danger on Friday. Where confidence is greatest in Red Flag
  Warning conditions occurring, a Fire Weather Watch has been
  issued.

- Confidence remains high (80%) in wintry precipitation impacting
  the region late Sunday into Monday morning, with the greatest
  travel impacts occurring north of I-70.

- An active pattern is expected next week, leading to multiple
  rounds of precipitation through the week.


&&

.SHORT TERM...  (Through Late Friday Night)
Issued at 253 PM CST Thu Feb 26 2026

Water vapor imagery this afternoon shows broad troughing present
across a majority of the CONUS; the trough`s axis positioned just
east of the CWA over the Ohio Valley. This has deep northwesterly
flow aloft over the Middle Mississippi Valley that has pushed a
surface ridge into the region, leading to mostly clear skies and
temperatures running above seasonal normals today. The surface ridge
will keep these calm conditions in place tonight, allowing for
radiational cooling to drop temperatures into the mid to low 30s.
However, these values are still above climatological normals.

Tomorrow, the surface ridge shifts eastward as a surface low moves
through far southern central Canada, causing the pressure gradient
to strengthen regionally. The placement of the surface ridge
supports southwesterly winds, and with the tightening pressure
gradient, strengthening winds through the morning and early
afternoon. Mostly clear skies promoting deep mixing, warming low-
level temperatures, and downsloping off the Ozarks will bump
temperatures for most locations into the low to mid 70s during the
afternoon. This warmth combined with low dew points will lead to RH
dropping below 30% for most locations, producing widespread Elevated
Fire Danger for a majority of the CWA thanks to the gusty winds.
Where confidence is at least 50% in RH dropping below 25% and
sustained winds reaching 15 kts (Red Flag Warning criteria) a Fire
Weather Watch has been issued for Friday afternoon. With winds and
dew points in this area forecast to reach just above criteria, the
decision on which zones to upgrade to a Red Flag Warning will occur
with the next forecast package when confidence increases further in
forecasted conditions.

Elmore

&&

.LONG TERM...  (Saturday through Next Thursday)
Issued at 253 PM CST Thu Feb 26 2026

Northwesterly flow will still be aloft over the Middle Mississippi
Valley on Saturday per guidance consensus. Within this flow, an
Arctic front will drop southward through the Midwest, passing
through the CWA early in the day. With flow through much of the
depth of the atmosphere being more west-northwesterly, the post-
frontal air will lag behind the FROPA, leading to many locations
seeing another day of well-above normal temperatures. There is a
signal for light precipitation along the mid-level front as it sinks
through the CWA during the afternoon, leading to low confidence (20%
chance) for rainfall.

The more notable chance for precipitation still looks to be Sunday
into Monday when a weak wave will pass through the Lower Midwest and
Mid South. While uncertainty still abounds concerning the details of
this system, guidance consensus has at least pushed back the onset
of precipitation to Sunday evening. As for the QPF spatial footprint
and magnitude, confidence is low. While the GFS/GEFS remains a
bullish outlier with storm total QPF, a majority of other guidance
has relatively lighter QPF. This is particularly the case with the
12z NAM, which has a stout low-level dry layer up through 00z Monday
that moisture will have to overcome to produce precipitation. The
NBM is beginning to ingest this drier NAM, combining with the less
aggressive guidance to tip the balance away from the GFS/GEFS and
lower forecasted snowfall amounts. Even with lower QPF, dynamics
Sunday night and early Monday morning will support precipitation
rates favorable for accumulating snowfall where surface temperatures
will be freezing or colder. Confidence is highest in this still
being north of I-70, though ground temperatures initially above
freezing will inhibit accumulation, especially on pavement. At this
lead time, wetbulbing and rates are expected to be great enough to
allow for accumulation on all surfaces within this portion of the
CWA. With the relatively lower QPF that a majority of guidance is
producing, a band of 2-4" of snowfall would result. If the more
robust GFS/GEFS QPF and lift within the dendritic growth zone is
realized, a band of 5"+ will be realized.

Along and south of the I-70 corridor, precipitation type is more
uncertain given marginal low-level temperatures. At the very least,
if snow and/or sleet mix in with the rain, warm ground temperatures
and at or just above freezing surface temperatures will limit
impacts. After sunrise Monday morning, precipitation will wind down
and shift east-southeastward as temperatures warm, quickly
decreasing the probability of impacts.

Given the plethora of impacts early in the period, little attention
was given to the details of the forecast beyond Monday. Ensemble
clusters and deterministic sources favor quasi-zonal to
southwesterly flow over the Middle Mississippi Valley, supporting
additional rounds of precipitation. With ensemble means showing
temperatures warming well above freezing, confidence is high that a
majority of this precipitation will be rain.

Elmore

&&

.AVIATION...  (For the 18z TAFs through 18z Friday Afternoon)
Issued at 1125 AM CST Thu Feb 26 2026

Confidence is high in dry and VFR flight conditions through the
TAF period at all local terminals. Winds will be variable for most
locations through this afternoon, becoming southwesterly late
tonight and tomorrow morning.

Elmore

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Fire Weather Watch Friday afternoon for Audrain MO-Knox MO-Lewis
     MO-Marion MO-Monroe MO-Pike MO-Ralls MO-Shelby MO.

IL...Fire Weather Watch Friday afternoon for Adams IL-Brown IL-Pike
     IL.

&&

$$

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






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