Old Jamestown, Missouri 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

625
FXUS63 KLSX 101030
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
530 AM CDT Sat Oct 10 2026

.KEY MESSAGES...

- Temperatures will be up to 10 degrees cooler over parts of the
  area today before warming back to near record warmth on
  Monday.

&&

.SHORT TERM /THROUGH SUNDAY/...
Issued at 251 AM CDT Sat Oct 10 2026

The latest surface analysis is showing a stationary front extending
from South Dakota through Iowa into central Illinois with center of
Post Tropical Cyclone Isaias over southern Alabama.  The latest NHC
track keeps Isaias well to the south and east of the CWA with the
HREF just printing out slight chances (15-20%) in the farthest
eastern part of the CWA late this afternoon and this evening.  IR
satellite imagery early this morning is showing high clouds
streaming northward toward the CWA this morning, but the HREF is not
indicating that central and northeast Missouri will see as much
clouds as previously thought allowing highs to climb into the middle
to upper 80s in those locations today.  Elsewhere, the mid and high
clouds on the northwest side of the system will allow highs to be 5-
10 degrees cooler than yesterday.

The clouds will begin to clear out tonight as Isaias moves off to
the east and an upper ridge builds over Missouri and Illinois.  With
clearing skies and light winds, lows should drop back into the 50s.
Highs on Sunday should climb back into middle 80s to around 90
degrees with the warmest readings over central Missouri.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Issued at 251 AM CDT Sat Oct 10 2026

Model guidance continues to be in good agreement on Monday with
ridging remaining across the Midwest and a front remaining to
the north of the CWA. This will set up southwesterly flow across
the CWA at the same time 850mb temperatures will be around 20C
which is the 99th percentile for this time of year. Temperatures
will be near or at record warmth (see climate section)
including the monthly record of 94 degrees at St. Louis. The
warmth will continue into Tuesday, but available guidance
continues to indicate a front will move south into the area
during the day resulting in a large variability in highs north
of I-70.

Showers will become likely with a chance for thunderstorms starting
Tuesday night that continues through Thursday as the LREF is showing
the upper ridge breaking down and the aforementioned front becoming
quasi-stationary across Missouri and Illinois.  It is during this
period when 40-60% of the LREF members are producing rain at St.
Louis. The cluster analysis is showing an increasing spread with how
deep a trough will be over the Great Lakes which ultimately will
determine how quickly we dry out and cool off by next weekend.  At
this point it looks like we will see highs in the 70s and 80s on
Wednesday and Thursday behind the front on Tuesday with the
potential for cooler weather by next weekend.

&&

.AVIATION /06Z TAFS THROUGH 12Z SUNDAY/...
Issued at 528 AM CDT Sat Oct 10 2026

Mainly dry and VFR conditions are expected through the
period. Winds will remain under 10 knots through the period.

&&

.CLIMATE...
Issued at 247 PM CDT Fri Oct 9 2026

Record high temperatures are possible between Friday 10/9 and Monday
10/12. Here are current records at each of our 3 official climate
stations:

                    KSTL            KCOU            KUIN
Saturday 10/10    92/1963         92/1963         89/1963
Sunday 10/11      94/1963         89/1962         88/1962
Monday 10/12      90/2024         94/1899         88/1975
Tuesday 10/13     90/1899         95/1899         87/1975

&&

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

&&

$$

SHORT TERM...Britt
LONG TERM...Britt
AVIATION...Britt
CLIMATE...Gosselin