Area Forecast Discussion
Issued by NWS St. Louis, MO

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS63 KLSX 190825
AFDLSX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
325 AM CDT Sun Oct 19 2014

.SHORT TERM:  (Through Monday)
Issued at 317 AM CDT Sun Oct 19 2014

The Canadian high pressure center which was located overhead early
this morning will shift southeastward today. Surface winds are
forecast to become southerly to southwesterly around the back side
of the high and ahead of an approaching cold front. The
clipper-like feature which will eventually drive this cold front
through the area was still located along the Alberta/Saskatchewan
border at 19/06z, but it is forecast to deepen and amplify as it
moves into the Great Lakes region tonight and tomorrow. Models
show limited moisture being drawn into the region ahead of the
cold front, and this should be sufficient for sprinkles or light
rain showers. Even though the strongest lift will be farther to
the east, an additional source of weak lift over the southern LSX
CWA may be provided early this evening by a compact vort max
which was located near the OK panhandle this morning. This feature
looks a bit stronger on water vapor imagery than the models would
suggest, and it was already producing light radar returns across
northern OK and southern KS. Precip chances diminish quickly after
18z tomorrow due to subsidence behind the front, decreasing
moisture, and decreasing lift as the low pressure system pulls
away from the area.

Kanofsky

.LONG TERM:  (Tuesday through Saturday)
Issued at 317 AM CDT Sun Oct 19 2014

The rest of the forecast looks dry and seasonably warm through the
middle of the week. A surface ridge axis will extend southwestward
from Ontario into MO/IL while an amplified upper ridge shifts
eastward over the area. There may be a chance of rain late in the
week (Thu/Fri) if the models are correct in developing a closed
low over the southern plains and if its influence extends far
enough eastward to affect sensible wx over MO/IL.

Kanofsky

&&

.AVIATION:  (For the 06z TAFs through 06z Sunday Night)
Issued at 1137 PM CDT Sat Oct 18 2014

Frost is still possible at terminals. Light FG will also be
possible, but most likely locations are SUS/CPS. Otherwise, winds
will become sly to sswly late Sun morning and remain light.

Specifics for KSTL: VFR and dry thru the period. Frost will be
possible tonight. Winds will become sly late Sun morning and
remain light thru the period.

&&

.LSX WATCHES/WARNINGS/ADVISORIES:
MO...NONE.
IL...NONE.
&&

$$

WFO LSX






USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.