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Old Jamestown, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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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: 7:36 am CDT Jul 4, 2026 |
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Independence Day
 Chance T-storms
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Tonight
 Chance T-storms
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Sunday
 Chance T-storms
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Sunday Night
 Chance T-storms
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Monday
 Chance T-storms
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Monday Night
 Partly Cloudy
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Tuesday
 Slight Chance T-storms
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Tuesday Night
 Partly Cloudy
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Wednesday
 Sunny
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| Hi 93 °F |
Lo 74 °F |
Hi 89 °F |
Lo 71 °F |
Hi 87 °F |
Lo 71 °F |
Hi 88 °F |
Lo 71 °F |
Hi 90 °F |
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Extreme Heat Warning
Independence Day
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A 50 percent chance of showers and thunderstorms, mainly after 11am. Increasing clouds, with a high near 93. Heat index values as high as 101. West wind 6 to 9 mph. |
Tonight
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A 50 percent chance of showers and thunderstorms. Mostly cloudy, then gradually becoming mostly clear, with a low around 74. West wind around 6 mph becoming light and variable after midnight. |
Sunday
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A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 89. West wind 3 to 7 mph. |
Sunday Night
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A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. North wind 5 to 7 mph becoming calm in the evening. |
Monday
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A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. North wind 3 to 7 mph. |
Monday Night
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Partly cloudy, with a low around 71. |
Tuesday
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. |
Tuesday Night
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Partly cloudy, with a low around 71. |
Wednesday
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Sunny, with a high near 90. |
Wednesday Night
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A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. |
Thursday
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. |
Thursday Night
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A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. |
Friday
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A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. |
Forecast from NOAA-NWS
for 3 Miles NNW Black Jack MO.
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Weather Forecast Discussion
618
FXUS63 KLSX 041150
AFDLSX
Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
650 AM CDT Sat Jul 4 2026
.KEY MESSAGES...
- Dangerously hot and humid conditions with heat index values
from around 100-105 continue today. Heat Advisories and an
Extreme Heat Warning remain in effect until 800 PM.
- There is a chance for thunderstorms today and tonight. Some
storms may be strong to severe and capable of producing 50-60
mph winds as well as hail up to 1 inch in diameter and locally
heavy downpours.
- The chance for showers and thunderstorms continues into early
next week, with temperatures closer to normal in the mid 80s to
around 90.
&&
.SHORT TERM... (Through Late Tonight)
Issued at 343 AM CDT Sat Jul 4 2026
Convective trends are very difficult to forecast today. Clusters
of thunderstorms over northwest Missouri and central Illinois are
pushing outflow boundaries east and south respectively. More
convection may continue to pop up over central Missouri as well,
which will reinforce the boundary if it gets strong enough. Either
boundary is a potential focus for thunderstorm development today,
and the boundaries could collide which would also be a great
forcing mechanism for convective development.
Clouds from morning convection that linger into the afternoon and/or
continuing scattered afternoon convection would almost certainly
suppress temperatures and end the excessive heat today. However,
timing and coverage is uncertain given the complex interactions
which will take place today. If coverage remains limited this
morning, temperatures could easily recover to reach heat index
values between 95-105. While this isn`t as hot as earlier in the
week, the duration of this heat wave continues to support the
current headlines, particularly since there will be a lot of people
outside for Independence Day celebrations. GFS and RAP show 2000-
4000 J/Kg CAPE developing this afternoon with as much as 25kts of
deep layer shear. This would support multi-cell clusters with the
potential to produce damaging winds. Think the chance for
thunderstorms will generally decrease in the evening with loss of
daytime heating, but there will still be a lingering thunderstorm
threat to Independence Day celebrations beyond sunset.
Carney
&&
.LONG TERM... (Sunday through Friday)
Issued at 343 AM CDT Sat Jul 4 2026
There`s little change to the remainder of the forecast for Sunday
through next Friday. A short wave digs into the Mississippi Valley
Sunday which pushes a weak cold front through the area. Global
guidance members diverge somewhat Monday in how they handle the
wave. The GFS digs the base of the trough deep into the Lower
Mississippi Valley where it fractures late Tuesday leaving a cut off
low over eastern Texas/western Louisiana. The ECMWF begins this
process much earlier on Monday night which puts the cut off low
farther north over Oklahoma and Arkansas. The more northern
solution seems to be favored by the NBM and the LREF mean which are
keeping precipitation chances going at least through Tuesday as the
closed low moves slowly northeast and is finally reintegrated into
the mean flow. While there`s a relatively dry period on Wednesday,
precipitation chances return Thursday and Friday as another short
wave moves across the Mid Mississippi Valley. Temperatures through
the period should be closer to seasonal normal as upper level long
wave ridging will remain well west of the area.
Carney
&&
.AVIATION... (For the 12z TAFs through 12z Sunday Morning)
Issued at 650 AM CDT Sat Jul 4 2026
Scattered showers and thunderstorms are possible through the
period. Current indications are that the best chance for
convection will be between 19Z and 02Z this evening with daytime
heating. Most storms will be capable of producing wind gusts to
35-40kts, and reduced visibility in moderate to heavy rain. A few
severe storms may be capable of downburst winds up to around
50kts, 1 inch hail, and heavy downpours reducing the visibility to
1 mile or less. Otherwise, With that in mind, VFR flight
conditions are expected to prevail outside of thunderstorms..
Carney
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 8 PM CDT this evening for Audrain MO-
Crawford MO-Iron MO-Knox MO-Lewis MO-Lincoln MO-Madison MO-
Marion MO-Monroe MO-Pike MO-Ralls MO-Reynolds MO-Saint
Francois MO-Shelby MO-Washington MO.
Extreme Heat Warning until 8 PM CDT this evening for Boone MO-
Callaway MO-Cole MO-Franklin MO-Gasconade MO-Jefferson MO-
Moniteau MO-Montgomery MO-Osage MO-Saint Charles MO-Saint
Louis City MO-Saint Louis MO-Sainte Genevieve MO-Warren MO.
IL...Heat Advisory until 8 PM CDT this evening for Adams IL-Bond IL-
Brown IL-Calhoun IL-Fayette IL-Greene IL-Jersey IL-Macoupin
IL-Marion IL-Montgomery IL-Pike IL.
Extreme Heat Warning until 8 PM CDT this evening for Clinton IL-
Madison IL-Monroe IL-Randolph IL-Saint Clair IL-Washington
IL.
&&
$$
WFO LSX
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