St. Joseph, Missouri 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

751
FXUS63 KEAX 060346
AFDEAX

Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
1046 PM CDT Tue May 5 2026

...Updated 06z Aviation...

.KEY MESSAGES...

* Rain/showers continue to generally wind down N to S over the area
  remainder of today.

  - Additional light rain/showers may be possible over night into
    early Wednesday. Mainly western areas between Highway 36
    and Highway 50

* Cool through Wednesday before warmer temperatures begin their
  return Thursday onward.

* Periodic chances for showers and thunderstorms through the
  weekend and into early next week. Chances for any strong to
  severe appear low in coming days.

&&

.DISCUSSION...
Issued at 340 PM CDT Tue May 5 2026

A wet and soggy day for a good chunk of the forecast area today.
Surface boundary has and continues to gradually sag southward,
currently residing over far southern Missouri. Isentropic analysis
nicely shows air mass/moisture overriding the surface front and
wrapping into the larger low level system. This and some very weak
instability have resulted in the persistent and slowly southward
sagging showers. All of the above has also prevented appreciable
warming for many, with temperatures still in the upper 40s to low
50s in areas of precipitation. Counter intuitively, Northern Missouri
will be warmest locations of the day as they have been rain free
much of the day. Overall precipitation activity to continue to ease
and drift southward with the low level boundaries and advection of
deeper dry air mass.

However, there will be another chance at some light rain/showers
late overnight into Wednesday morning. An area of elevated (~700mb)
convergence concurrent with ongoing isentropic lift below will
attempt to nose into the area. May be aided by some shortwave
impulse, but larger wave appears ill timed (slow/later). It is
possible for some very weak instability within this elevated area
with borderline lapse rates above and would be the most likely
scenario for anything appreciable reaching the ground. Otherwise,
soundings and lift depictions suggest it would be difficult to
appreciably precipitate. Best chances over western forecast area,
largely between Highways 36 and 50. Larger northern stream shortwave
trough drops through the flow later Wednesday, with bulk of lift/any
additional precipitation chances anticipated to just pass SW.
Trailing surface high ushers in reinforcing dry air to the larger
area. The lack of WAA keeps temperatures below normal Wednesday,
predominantly forecast in the upper 50s to low 60s.

Warming trend returns Thursday into the weekend SS/S surface flow
prevailing much of the time. This tends to push temperatures a
handful of degrees warmer each day Thursday/Friday/Saturday and
topping out in the low 80s by Saturday. Some tempered expectations
may be warranted Friday though, as deterministic and ensemble
guidance in fair agreement on a shortwave within the mid-upper level
may provide a few showers/thunder opportunities. Another, more
robust, shortwave is also well depicted within broad guidance Sunday
and too would provide another opportunity for some showers/storms
and temperatures easing back a few degrees. Currently, Gulf moisture
return is ill timed/not open, so this too appears as more of a
shower/non-severe thunder situation. Warming then picks back up into
at least early work week as we see broader mid level height rises
and warmer 850mb temps building into portions of the Central
Plains.

&&

.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 1044 PM CDT Tue May 5 2026

Second round of showers possible early Wednesday morning across
portions of the area. Cloud bases are expected to remain VFR
during this activity. A brief period of MVFR visibility may be
possible with some rain activity. Winds will remain light as
high pressure slowly moves in.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...None.
KS...None.

&&

$$

DISCUSSION...Curtis
AVIATION...Krull