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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: 3:36 pm CDT May 5, 2026
 
This
Afternoon
This Afternoon: Showers and possibly a thunderstorm.  Steady temperature around 50. North wind around 10 mph.  Chance of precipitation is 100%.
Showers

Tonight

Tonight: Showers and possibly a thunderstorm before 2am, then a slight chance of showers between 2am and 4am.  Low around 46. North wind 5 to 9 mph becoming light.  Chance of precipitation is 100%.
Showers then
Chance
Showers
Wednesday

Wednesday: A slight chance of showers between 7am and 1pm.  Partly sunny, with a high near 59. Northwest wind 6 to 8 mph.  Chance of precipitation is 20%.
Slight Chance
Showers
Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 43. North wind around 6 mph becoming calm  in the evening.
Partly Cloudy

Thursday

Thursday: Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.
Mostly Sunny

Thursday
Night
Thursday Night: Mostly clear, with a low around 47.
Mostly Clear

Friday

Friday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm.  Mostly sunny, with a high near 74. Chance of precipitation is 30%.
Mostly Sunny
then Chance
T-storms
Friday
Night
Friday Night: Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers.  Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Showers
Likely
Saturday

Saturday: Sunny, with a high near 81.
Sunny

Hi 50 °F Lo 46 °F Hi 59 °F Lo 43 °F Hi 66 °F Lo 47 °F Hi 74 °F Lo 53 °F Hi 81 °F

Hazardous Weather Outlook
 

This Afternoon
 
Showers and possibly a thunderstorm. Steady temperature around 50. North wind around 10 mph. Chance of precipitation is 100%.
Tonight
 
Showers and possibly a thunderstorm before 2am, then a slight chance of showers between 2am and 4am. Low around 46. North wind 5 to 9 mph becoming light. Chance of precipitation is 100%.
Wednesday
 
A slight chance of showers between 7am and 1pm. Partly sunny, with a high near 59. Northwest wind 6 to 8 mph. Chance of precipitation is 20%.
Wednesday Night
 
Partly cloudy, with a low around 43. North wind around 6 mph becoming calm in the evening.
Thursday
 
Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.
Thursday Night
 
Mostly clear, with a low around 47.
Friday
 
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 74. Chance of precipitation is 30%.
Friday Night
 
Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Saturday
 
Sunny, with a high near 81.
Saturday Night
 
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Sunday
 
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 74.
Sunday Night
 
Partly cloudy, with a low around 50.
Monday
 
Sunny, with a high near 72.
Monday Night
 
Mostly clear, with a low around 52.
Tuesday
 
A 20 percent chance of showers. Sunny, with a high near 80.

 

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

Weather Forecast Discussion
820
FXUS63 KLSX 051927
AFDLSX

Area Forecast Discussion
National Weather Service Saint Louis MO
227 PM CDT Tue May 5 2026

.KEY MESSAGES...

- Rain will end from northwest to southeast tonight.

- It will be relatively cool Wednesday and Thursday, but warmer
  temperatures and a chance for showers and thunderstorms returns
  Friday.

&&

.SHORT TERM...  (Through Late Wednesday Night)
Issued at 227 PM CDT Tue May 5 2026

A cold front continues moving slowly through southeast Missouri this
afternoon.  The 850mb low associated with this system is over
northeast Oklahoma and is producing southerly flow across the Ozarks
and up the I-44 corridor into southwest and south central Illinois.
Short range RAP forecast is showing increasing low level moisture
convergence this afternoon into this evening along the 850mb front
due to this warm moist flow as it sags slowly south.  This moisture
convergence will continue to produce light to occasionally moderate
rain with a rumble or two of thunder this afternoon and evening.
Rain will taper off and end from northwest to southeast tonight as
the 850mb front finally drifts into Arkansas and Kentucky.

Cooler and drier air will filter into the area behind the front with
Wednesday morning`s lows dipping into the low to mid 40s.  Previous
forecasts were hinting at a chance for some light rain on Wednesday
as a mid-upper level trough digs into the Great Plains.  Latest runs
are showing somewhat weaker frontogenesis ahead of the trough, and
somewhat drier low levels.  LREF >0.01 QPF probs have fallen to 20%
and below for Wednesday, and all deterministic guidance shows much
less, if any QPF.  Have therefore reduced PoPs to only slight chance
(20%), and mainly in the morning.  Highs will struggle to reach 55-
60 on Wednesday due to lingering clouds and continuing weak cold
advection.  The cool start to the evening along with breaks in the
overcast and light winds will allow temperatures to cool into the
upper 30s to low 40s Wednesday night/Thursday morning.

Carney

&&

.LONG TERM...  (Thursday through Next Tuesday)
Issued at 227 PM CDT Tue May 5 2026

The weather pattern over North America for Thursday through next
Tuesday will be dominated by an upper level low over Hudson Bay, and
semi-persistent long wave ridging over the West Coast.  This results
in persistent west to northwest flow aloft over the Mid Mississippi
Valley through the period.  A few short waves will move across the
area embedded in the long wave flow, at least two of which will have
the potential to produce more rain.  The first wave on Thursday
pushes the cold front through the Lower Mississippi Valley into
the northern Gulf.  Forecast soundings show a fairly dry atmosphere
above us, so the wave should pass with little sensible weather at
the surface.  The wave will help to move the cool surface high from
the eastern Plains into the Lower Mississippi Valley by late
Thursday which will keep our afternoon highs seasonably cool in the
mid 60s.

Low level flow swings back to the southwest as the surface high
moves across the Appalachians Thursday night.  This brings some
moisture back into our region for the next short wave on Friday to
work with.  Models generate some light QPF across the area as the
wave moves through Friday afternoon, and CAPE values rise to around
1000 J/Kg ahead of the surface reflection of the wave.  This will
likely result in scattered showers and a few thunderstorms in the
afternoon.  Forecast soundings show weak lapse rates and skinny CAPE
profiles which are not conducive to strong updrafts and severe
storms.  Temperatures show a steady rise Friday into Saturday as low
level flow mostly prevails from the southwest, even after the
trough passes on Friday night.

A third, stronger short wave will dig into the Great Plains Saturday
night into Sunday morning.  This wave will push a cold front through
the area on Sunday and there should be plenty of moisture to produce
precipitation with this system.  The LREF continues to show some
variance with the timing and amplitude of the wave, and therefore
the speed of the front and strength of cold air advection behind it.
 Temperature IQRs have narrowed on this morning`s 12Z run of the
LREF, but are still 6-8 degrees both Sunday and Monday.
Deterministic NBM highs both days are in the low to mid 70s which is
around the 75th percentile for the LREF.  Another short wave is
forecast to move into the Great Plains on Tuesday with another
chance for precipitation.  However the LREF cluster analysis is
showing a lot of variance in is position, so confidence in another
round of rain is low at this time.


Carney

&&

.AVIATION...  (For the 18z TAFs through 18z Wednesday Afternoon)
Issued at 1228 PM CDT Tue May 5 2026

Periods of rain will continue this afternoon into the evening.
There may also be an embedded thunderstorm or two mainly along and
south of I-70. Low ceilings will spread north into central and
east central Missouri as well as south west and south central
Illinois this afternoon. Current thinking is that ceilings will
fall to low-end MVFR with patches of IFR in these areas before
lifting back to MVFR and VFR in most locations overnight. Low
ceilings will likely linger over the eastern Ozarks until 14-16Z
Wednesday.

Carney

&&

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

$$

WFO LSX
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