Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 220933

Area Forecast Discussion
National Weather Service Boise ID
333 AM MDT Sat Jul 22 2017

.SHORT TERM...Today through Sunday...Dry westerly flow continues
through today. A weak upper-level wave crossing the northern
Sierras this morning may generate some convective cloudiness that
could clip southern Twin Falls county late this afternoon and
overnight. After that goes by, a more substantial low moves
toward the California Coast, which turns the flow more southerly
and will eventually increase moisture greatly. Could see some
showers and thunderstorms entering the forecast area by late
Sunday afternoon, but they will likely wait until at least Sunday
evening. Temperatures will rise on Sunday in the southerly flow,
bringing afternoon temperatures in the lower valleys near 100.

.LONG TERM...Sunday night through Saturday...Upper ridge on Monday
will lead to hot temperatures, with valley highs in the 90s to
around 100F. Monsoon moisture will start to enter from the south,
with thunderstorms possible especially near the Nevada border.
Thunderstorm chances will increase on Tuesday as moisture continues
advancing northward ahead of an approaching upper low near the
California coast. The thunderstorms may produce heavy rain due to
high precipitable water values of over an inch. The upper low will
weaken as it tracks E-NE through Oregon and Idaho Wednesday through
Wednesday night. Although drier air will follow the passage of the
low, residual moisture and instability will allow for a slight
chance of thunderstorms for the remainder of the week, mainly in SW
Idaho. Temperatures will be slightly above normal.

.AVIATION...VFR with mostly clear skies through Sunday. Variable
surface winds up to 10 kts. Winds aloft near 10k ft MSL: westerly 5-
15 kts.




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