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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: 1:36 pm CDT Apr 28, 2026
 
This
Afternoon
This Afternoon: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 69. North wind around 5 mph.
Chance
Showers
Tonight

Tonight: Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am.  Low around 51. Northeast wind 6 to 8 mph becoming north after midnight.  Chance of precipitation is 80%.
Showers
Wednesday

Wednesday: Mostly sunny, with a high near 65. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.
Mostly Sunny
Wednesday
Night
Wednesday Night: Mostly clear, with a low around 44. North wind 5 to 9 mph becoming calm  after midnight.
Mostly Clear
Thursday

Thursday: Mostly sunny, with a high near 66. Calm wind becoming northwest 5 to 8 mph in the morning.
Mostly Sunny
Thursday
Night
Thursday Night: A 20 percent chance of showers before 1am.  Mostly cloudy, with a low around 46.
Slight Chance
Showers
Friday

Friday: Mostly sunny, with a high near 61.
Mostly Sunny
Friday
Night
Friday Night: Mostly cloudy, with a low around 41.
Mostly Cloudy
Saturday

Saturday: Mostly sunny, with a high near 62.
Mostly Sunny
Hi 69 °F Lo 51 °F Hi 65 °F Lo 44 °F Hi 66 °F Lo 46 °F Hi 61 °F Lo 41 °F Hi 62 °F

Hazardous Weather Outlook
 

This Afternoon
 
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69. North wind around 5 mph.
Tonight
 
Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Low around 51. Northeast wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 80%.
Wednesday
 
Mostly sunny, with a high near 65. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
 
Mostly clear, with a low around 44. North wind 5 to 9 mph becoming calm after midnight.
Thursday
 
Mostly sunny, with a high near 66. Calm wind becoming northwest 5 to 8 mph in the morning.
Thursday Night
 
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 46.
Friday
 
Mostly sunny, with a high near 61.
Friday Night
 
Mostly cloudy, with a low around 41.
Saturday
 
Mostly sunny, with a high near 62.
Saturday Night
 
Mostly clear, with a low around 43.
Sunday
 
Sunny, with a high near 71.
Sunday Night
 
A 20 percent chance of showers. Mostly clear, with a low around 50.
Monday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 73.
Monday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 52.
Tuesday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76.

 

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

Weather Forecast Discussion
539
FXUS63 KLSX 282053
AFDLSX

Area Forecast Discussion
National Weather Service Saint Louis MO
353 PM CDT Tue Apr 28 2026

.KEY MESSAGES...

-There remains a 40-90% chance of showers and thunderstorms,
 primarily this evening. A few severe thunderstorms are possible
 across parts of southeast Missouri and southwest Illinois through early
 this evening.

-Mainly dry weather is expected the rest of the week with below
 normal temperatures.


&&

.SHORT TERM...  (Through Late Wednesday Night)
Issued at 351 PM CDT Tue Apr 28 2026

Numerous thunderstorms have developed this afternoon across central
and southern Missouri in advance of a shortwave trough currently
over the central Plains.  Most of the severe thunderstorms have
produced large hail as the instability is elevated given that the
surface front now extends from the lower Ohio Valley into northern
Arkansas. The latest RAP is showing an increase MUCAPE values
increasing into the 1000-1500 J/kg through the late afternoon with
deep layer shear in the 40 to 50 knot range supporting isolated
supercells producing large hail over central and southeast Missouri.
 Additional thunderstorms are developing and will likely congeal
over southwest Missouri later this afternoon and this evening which
will pose a damaging wind threat over the far southern part of the
CWA.  As the upper trough moves east, large scale ascent will
increase across the area supporting the 40-90% HREF probabilities,
particularly over the southeast half of the CWA.  This precipitation
will move out of the area late tonight behind the trough and we will
see dry weather the Wednesday and Wednesday night as a surface high
moves into Missouri and Illinois.

With weak cold air advection, highs will only be in the 60s on
Wednesday and lows on Wednesday night will be in the lower to mid
40s which will be 5 to 10 degrees below normal.

Britt

&&

.LONG TERM...  (Thursday through Next Tuesday)
Issued at 351 PM CDT Tue Apr 28 2026

After this system, the weather is expected to be mainly dry except
for late Thursday into Thursday night when another weak shortwave
trough will move across the area bringing 20% chance of showers and
thunderstorms along southward moving cold front.  The LREF is showing
the upper flow going from quasi-zonal to northwesterly over the
Midwest from midweek into the weekend which supports below normal
temperatures into the weekend.

Britt

&&

.AVIATION...  (For the 18z TAFs through 18z Wednesday Afternoon)
Issued at 1225 PM CDT Tue Apr 28 2026

Clouds with ceilings between 2000 and 4000 feet will persist into
the afternoon, though there should be an increase in the bases
into the early afternoon. Showers and thunderstorms over
southwest Missouri will move into COU/JEF around 19Z, into the St.
Louis metro terminals and UIN around 21Z. While the chance for
thunderstorms will only be around 30% and will only last 2-4
hours, the chance for rain will be higher 60-80% and last in the
evening and overnight hours except at UIN where the overall chance
remains at 30-40%. Where it does persist, ceilings will drop into
the 1000-2000 foot range late this evening and overnight with IFR
conditions possible (20-40% chance). Then dry and VFR conditions
are expected to develop between 12-15Z on Wednesday.

Britt

&&

.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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