Old Jamestown, Missouri 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

228
FXUS63 KLSX 132024
AFDLSX

Area Forecast Discussion
National Weather Service St Louis MO
224 PM CST Fri Nov 13 2026

.KEY MESSAGES...

- A winter-like chill continues through the weekend, bringing a
  hard freeze for much of the area each night. Temperatures warm
  back to seasonal normals early next week.

&&

.SHORT TERM /THROUGH SUNDAY/...
Issued at 221 PM CST Fri Nov 13 2026

Regional satellite imagery currently shows a field of
stratus/stratocumulus across most of the area that has persisted
through much of the day. This cloud field coincides with the
strongest low-level CAA and resultant coldest air at 850mb, that is
right around -8C per the most recent SPC mesoanalysis. Further to
the east, scattered to isolated showers from a lake effect band off
of Lake Michigan are filtering into southern IL. Most of this will
stay to the east of the area, but there still remains a low chance
(10-20%) for scattered pockets of sprinkles through the afternoon
across this area.

Just off to the north, a broadened surface ridge axis is positioned
from the Upper Midwest all the way northeastward into Hudson Bay,
and is slowly sliding southward into the region. As the influence of
this approaching feature increases, mostly clear conditions along
with calm surface winds will prevail into tonight. The result will
be a night of efficient radiational cooling with lows reaching the
20s across the entire area by tomorrow morning. Nearly all rural
areas are forecast to fall into the lower 20s with some upper teens
possible across the more sheltered locations. A clear sky allowing
for abundant solar insolation will warm most locations into the mid
40s by the afternoon tomorrow with light winds continuing. A similar
story will ensue Saturday night with another setup promoting
radiational cooling. In fact, less cloud cover has been the trend
for Saturday night leading to a cooler low temperature forecast that
is much like the one for tonight. By Sunday, the airmass slightly
modifies allowing for afternoon highs that should be about 3-5
degrees warmer than Saturday.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Issued at 221 PM CST Fri Nov 13 2026

By the beginning of the week, the slow moving surface high will be
nearing the Ohio River Valley leading to the return of light
southerly flow and continued airmass modification. Guidance is in
good agreement that 925mb temperatures should be near 5C for most of
the area on Monday and Tuesday. Complete mixing would result in high
temperatures mostly in the mid 50s each afternoon, which is near
seasonal normals. Eventually, the surface high slides off into the
Mid Atlantic leading to the return of WAA thanks to stronger
southerly flow. By the middle to late part of next week, there is
good agreement that seasonably warm temperatures return with highs
back into the 60s across the area. Additionally, long-range guidance
reveals longwave troughing across the Pacific Coast with a shortwave
traversing ahead of the main wave and into the Midwest late next
week. As a result, probabilities for 24hr measurable precipitation
reach near 50% for most of the region by next Friday according to
the LREF. Until then, dry conditions are expected to continue into
at least the middle of next week.

&&

.AVIATION /18Z TAFS THROUGH 00Z SUNDAY/...
Issued at 1116 AM CST Fri Nov 13 2026

A field of low-VFR stratus (3-5kft) is positioned across eastern MO
and IL as of late this morning. This cloud field is expected to
remain VFR before slowly advecting and scattering out from
north to south later this afternoon. Later tonight a surface
high slides into the area leading to light and variable winds
along with a clear sky that will lead to the continuation of dry
and VFR conditions.

&&

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

&&

$$

SHORT TERM...Peine
LONG TERM...Peine
AVIATION...Peine