Area Forecast Discussion
Issued by NWS Rapid City, SD

Home | Current Version | Previous Version | Text Only | 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
000
FXUS63 KUNR 152102
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
302 PM MDT Fri Sep 15 2017

.DISCUSSION...(This Evening Through Friday)
Issued at 253 PM MDT Fri Sep 15 2017

Water vapor shows upper trof approaching the Rockies with strong
shortwave lifting through southeast Montana/southwest North
Dakota. Bulk of precipitation lifting north of forecast area with
scattered showers around the Black Hills. A few showers will
linger into tonight as secondary shortwave crosses western South
Dakota. Temperatures marginally cool enough for rain/snow mix in
higher elevations of Black Hills and northeast Wyoming. Upper
trof crosses northern plains Saturday. Steep lapse rates will
result in diurnal trend to showers. High pressure across the area
Saturday night with clearing skies. Frost likely for low lying
areas on the plains.

The models remain in decent agreement next week with another deep
trof moving into the western CONUS.  Shortwave ridging ahead of
the trof will bring warm and dry conditions Monday/Tuesday with
cold front crossing the area Tuesday night. Cooler for the second
half of the week with increasing chances of precipitation.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Saturday)
Issued At 1141 AM MDT Fri Sep 15 2017

Showers and isolated thunderstorms will continue to produce
MVFR/IFR/local LIFR conditions through the forecast period. Lowest
CIGS will be across the Black Hills and portions of northeast
Wyoming.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...7
AVIATION...13



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