U.S. Alerts
El Dorado Weather Logo
U.S. Radar Loop Conditions Map

U.S. Color Topo IR Sat North America Color Background Satellite Thumb
Interactive Wx Map Live U.S. Google Map Radar Thumbnail Image

US Precipitation 1 day, 24 hour precipitation map

US Temperatures US Conditions Map

US Climate Data US Conditions Map

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: 5:26 pm CDT Jul 29, 2026
 
Tonight

Tonight: Clear, with a low around 67. East wind 3 to 6 mph.
Clear

Thursday

Thursday: Sunny, with a high near 86. East wind 3 to 7 mph.
Sunny

Thursday
Night
Thursday Night: Partly cloudy, with a low around 68. Southeast wind around 7 mph.
Partly Cloudy

Friday

Friday: Showers likely, with thunderstorms also possible after 1pm.  Mostly cloudy, with a high near 84. South wind 7 to 11 mph.  Chance of precipitation is 70%.
Showers
Likely

Friday
Night
Friday Night: Showers and possibly a thunderstorm before 4am, then showers likely.  Low around 69. South wind 8 to 11 mph becoming west after midnight.  Chance of precipitation is 80%.
Showers

Saturday

Saturday: A chance of showers, with thunderstorms also possible after 1pm.  Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 66.
Slight Chance
T-storms

Sunday

Sunday: A 20 percent chance of showers after 1pm.  Mostly sunny, with a high near 82.
Mostly Sunny
then Slight
Chance
Showers
Sunday
Night
Sunday Night: Mostly clear, with a low around 66.
Mostly Clear

Lo 67 °F Hi 86 °F Lo 68 °F Hi 84 °F Lo 69 °F Hi 79 °F Lo 66 °F Hi 82 °F Lo 66 °F

 

Tonight
 
Clear, with a low around 67. East wind 3 to 6 mph.
Thursday
 
Sunny, with a high near 86. East wind 3 to 7 mph.
Thursday Night
 
Partly cloudy, with a low around 68. Southeast wind around 7 mph.
Friday
 
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 84. South wind 7 to 11 mph. Chance of precipitation is 70%.
Friday Night
 
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 69. South wind 8 to 11 mph becoming west after midnight. Chance of precipitation is 80%.
Saturday
 
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
Saturday Night
 
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.
Sunday
 
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82.
Sunday Night
 
Mostly clear, with a low around 66.
Monday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 84.
Monday Night
 
Mostly clear, with a low around 68.
Tuesday
 
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 87.
Tuesday Night
 
Mostly clear, with a low around 70.
Wednesday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

 

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

Weather Forecast Discussion
839
FXUS63 KLSX 292317
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
617 PM CDT Wed Jul 29 2026

.KEY MESSAGES...

- Temperatures will be near to slightly below normal today and
  Thursday. It will also be less humid than in recent days.

- Showers and a few thunderstorms are likely Thursday night
  through Friday night. A chance for rain lingers Saturday.

&&

.SHORT TERM /THROUGH THURSDAY NIGHT/...
Issued at 107 PM CDT Wed Jul 29 2026

Today: Surface high pressure is currently centered over
Wisconsin and is slowly moving to the southeast. Across
central/ eastern Missouri and western Illinois winds are out of
the northeast with only some very shallow cumulus and thin high
clouds across central Missouri. The surface high pressure will
slowly move southeast through the day today and tonight as the
longwave trough axis moves east. Dewpoints have also responded
to the dry air slowly advecting in from the east this afternoon
and are now in the lower to mid 60s. Temperatures are expected
to top out in the mid to upper 80s today.

Tonight through Thursday night: Surface high pressure will
center over Illinois Thursday morning with surface winds veering
from the southwest. By Thursday afternoon into evening, a piece
of vorticity at 500 mb will advect east across the Dakotas. As
this happens, the longwave trough axis will begin to buckle and
elongate. Precipitation will start to move in late Thursday
night, but given the broken off low over New England and the
impending wave breaking at 250 mb the thinking is that most of
Thursday night will be dry.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 107 PM CDT Wed Jul 29 2026

By Friday, the aforementioned vorticity will begin to sweep
southeast across Iowa with showers likely and a few
thunderstorms. At 500 mb, the wave axis will be seasonably
strong with heights falling to around 582 dam or ~ 2 SD
anomalies below normal for this time of year. Simultaneously, at
250 mb a jet streak is forecast to round the base of the
shortwave trough giving a slight enhancement to the upper level
divergence. Regarding instability, the GFS continues to
advertise MU cape values approaching 3800 J/kg Friday afternoon.
Taking a look at the LREF though, MU CAPE values are advertised
to be much more reasonable around 1600 J/kg. Surface to 6 km
shear is forecast to be around 35 kt. Given the above, SPC has
outlooked the region (mainly central Missouri) in a marginal
risk. Damaging wind gusts appear to be the primary threat
(mostly in the afternoon and early evening hours of Friday).

Saturday and beyond is where model guidance starts to diverge.
In particular, the deterministic GFS and ECMWF continue to
oscillate back and forth on whether a closed low, or wave
breaking, will occur from the Friday vorticity. Why does this
matter? If a closed low forms, precipitation chances will likely
hold on longer (into Sunday and possibly Monday). If a closed
low doesn`t form (or is really weak and forms east of
Missouri), the area will likely dry out sooner. Analyzing the
latest WPC cluster analysis reveals that the GEFS and GEPS
ensemble suites are most similar and advertise a more
progressive solution (not a closed low forming). In fact, the
EPS which has broad support for a closed low appears under
dispersive. 50% of the EPS guidance is clustered together with
only 15% of the GEPS and 3% of the GEFS. This under dispersion
of the EPS has allowed us to continue to trend our thinking
towards Sunday being more of a dry forecast with below normal
temperatures. For the beginning of the next work week, near
normal temperatures and mostly dry conditions will persist.

&&

.AVIATION /00Z TAFS THROUGH 06Z FRIDAY/...
Issued at 616 PM CDT Wed Jul 29 2026

Dry and VFR flight conditions are forecast for the entire TAF
package. Surface winds remain light for the entire period with
northeasterly winds slowly veering overnight into tomorrow with
southeasterly winds prevailing through tomorrow. Upper-level
clouds will be on the increase from the northwest tomorrow
afternoon.

&&

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

&&

$$

SHORT TERM...BAH
LONG TERM...BAH
AVIATION...Peine
View a Different U.S. Forecast Discussion Location
(In alphabetical order by state)



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






Contact Us Contact Us Thumbnail | Mobile Mobile Phone Thumbnail
Private Policy | Terms & Conds | Consent Preferences | Cookie Policy
Never base any life decisions on weather information from this site or anywhere over the Internet.
Site is dedicated to our Lord & Savior Jesus Christ | Random Quotes of Jesus

Copyright © 2026 El Dorado Weather, Inc. | Site Designed By:  Webmaster Danny