Area Forecast Discussion
Issued by NWS Riverton, WY

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
000
FXUS65 KRIW 152033
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
233 PM MDT Sat Jul 15 2017

.SHORT TERM...(This evening through Tuesday)
Issued at 235 PM MDT Sat Jul 15 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place into early next week with the polar jet across the Pacific
Northwest and Southern Canada.  Little variation in temperatures
and Relative humidity is expected.  The air mass will be most
unstable in the afternoons and early evening hours with scattered
showers and isolated thunderstorms with strong win gusts.  Overall
winds will be light except for the thunderstorm outflow winds.

.LONG TERM...(Tuesday night through Saturday)
Issued at 235 PM MDT Sat Jul 15 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place Tuesday night through Saturday with the polar jet across the
Pacific Northwest and Southern Canada.  Little variation in
temperatures and Relative humidity is expected.  The air mass will
be most unstable in the afternoons and early evening hours with
scattered showers and isolated thunderstorms with strong win gusts.
Overall winds will be light except for the thunderstorm outflow
winds.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 235 PM MDT Sat Jul 15 2017

VFR conditions will prevail through the period.  This evening,
moisture and instability will combine over western and northern
Wyoming with more stable and dry conditions vicinity and south of a
KRKS-KCPR line. Isolated showers and thunderstorms are expected
across the north and west until around 03z. The main hazards with
these showers and storms will be erratic outflow wind gusts 25-35
knots and brief heavy rainfall. In the upcoming afternoon period, an
upper level disturbance and associated surface front will race
across the northern half of Wyoming from west to east...providing
further impetus to fire quick moving isolated to widely scattered
showers and storms...most with very gusty outflow winds of 40 to
55 mph and little rainfall.

&&

.FIRE WEATHER...
Issued AT 235 PM MDT Sat Jul 15 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place into early next week with the polar jet across the Pacific
Northwest and Southern Canada.  Little variation in temperatures and
Relative humidity is expected.  The air mass will be most unstable
in the afternoons and early evening hours with scattered showers and
isolated thunderstorms with strong win gusts.  Overall winds will be
light except for the thunderstorm outflow winds.  Afternoon mixing
heights will be favorable with sufficient transport winds for very
good to excellent smoke dispersal.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...Baker
LONG TERM...Baker
AVIATION...Braun
FIRE WEATHER...Baker



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