Area Forecast Discussion
Issued by NWS Boise, ID
FXUS65 KBOI 272110
Area Forecast Discussion
National Weather Service Boise ID
310 PM MDT WED JUL 27 2016
.SHORT TERM...Tonight through Friday...A weak shortwave is visible
on the water vapor satellite imagery, moving across central WA/OR
border this afternoon and into western MT this evening. A slight
chance of thunderstorms will be possible mainly north of a line
from Baker City, OR to McCall, ID this evening. The shortwave will
push east overnight and drier air will push into the region for
Thursday. Expect mostly sunny skies, and light winds on Thursday
with temperatures remaining around 5 to 10 degrees above normal.
Smoke from the Pioneer Fire will continue to reduce visibilities
in the Boise and central Idaho mountains. Smoke will trickle down
the Boise River and Payette River Valleys during the morning and into
the Treasure Valley and Magic Valleys on Thursday and Friday. The
upper level ridge over the Desert Southwest begins to build north
on Friday, bringing slightly warmer temperatures aloft and
monsoonal moisture northward to the Nevada border. A slight chance
of thunderstorms will be possible Friday afternoon and evening along
the Nevada border.
.LONG TERM...Friday night through Wednesday...As a trough develops
along the Pacific coast, a southwest flow will continue to bring
monsoon moisture north of the Nevada border and across the region.
This northward moving moisture will largely be marked by increased
cloud coverage through Saturday. Expecting a slight chance of
thunderstorms due to diurnal heating Friday night and Saturday
afternoon/evening as temperatures remain well above normal with
valley temperatures above 100F. Minimal precipitation can be
expected with the anticipated convection through Saturday. The
developing trough will deepen and move eastward Sunday, kicking most
of the monsoon moisture out of the region by Sunday afternoon with
the help of a weak dry cold front early in the day. Temperatures
Sunday will come down about 10 degrees to the seasonal norms.
Forecast expected to remain dry with temperatures near normal
through Wednesday under a zonal flow.
.AVIATION...VFR. Smoke layers and MVFR visibilities near Lowman ID
and surrounding valleys through the evening with obscuration.
Smoke layers to move into the Treasure Valley between KBOI and
KMUO overnight. Isolated thunderstorms north of a KBKE-KMYL line
through 03Z. Surface winds W-NW 10-15 kt, decreasing by 03Z.
Winds aloft through 10KFT MSL, W 5-15 kt.