Sunrise 6:50 AM   Sunset 8:36 PM Moonrise 4:35 PM   Moonset 4:42 AM

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FXUS65 KBOI 201535 AFDBOI

Area Forecast Discussion National Weather Service Boise ID 935 AM MDT Sat Apr 20 2024

DISCUSSION
Mostly sunny and warm today. A dry cold front will move through tomorrow, bringing gusty NW winds to most areas.
Temperatures will be cooler tomorrow, but still above normal.
All this is handled well by the current forecast and no changes will be made at this time. The flood warning for the Owyhee River is set to expire at noon today and we'll send out an expiration statement at that time.

AVIATION
VFR through 21/04Z. Mostly clear today, then increasing mid-high clouds tonight. Isolated showers developing across e-central OR and w-central ID after 21/04Z with MVFR conditions and mountain obscuration in showers. Snow levels generally above 7000 ft MSL. Surface winds: SW-SE 5-15 kt, with local gusts to 25 kt. Winds aloft at 10kft MSL: W-SW 10-20 kt.

KBOI...VFR. Surface winds generally SE 7-13 kt today, then 3-7 kt tonight, becoming NW 10-15 kt Sunday.

Sunday Outlook...Isolated MVFR conditions and mountain obscuration in showers across higher terrain of eastern OR and w-central ID Sunday morning, otherwise VFR. Snow levels generally above 5500 ft MSL. Surface winds: W-NW 10-25 kt with local gusts to 35 kt Sunday. Strongest gusts KBKE to KONO Sunday morning and in the Snake Plain east of KBOI Sunday afternoon.

PREV DISCUSSION
SHORT TERM
Today through Monday night
Incoming Pacific upper ridge will pass overhead today with warmer air along with increasing high clouds. Faster-moving north Pacific trough will come inland across WA and northern ID overnight and early Sunday, flattening the ridge. Surface cold front will pass through our CWA Sunday but pcpn should stay generally north of our CWA, whereas yesterday/s forecasts had showers as far south as the central ID mountains. The front will lower max temps 4 to 8 degrees Sunday with gusty west/northwest winds.
Monday morning looks clear and colder with lows in the 20s and 30s, with the southern Idaho ag valley lows between 32 and 38 degrees. Temps will trend upward again beginning Monday afternoon as the upper trough exits east. Skies will stay clear with light diurnal winds Monday and Monday night.

LONG TERM
Tuesday through Saturday
An upper level ridge will pass overhead on Tuesday, bringing warmer temperatures and mostly dry conditions. However, moisture ahead of a broad Pacific trough will increase along a shortwave impulse late in the day, bringing a 10-20% chance of showers and thunderstorms to the area. The trough will move inland Wednesday into Thursday, bringing a 10-40% chance of showers to the area, with the best chances in the higher terrain. A slight chance of thunderstorms will also develop on Wednesday as our area remains in the warm sector.
Temperatures are expected to cool 5 to 10 degrees on Thursday as the trough moves overhead, which would still be near to slightly above normal. Snow levels should also remain above 5500 feet MSL.
Another trough will move through Friday and Saturday, bringing a 20-50% chance of showers with temperatures remaining near normal. The active pattern will also bring breezy conditions late in the week.

BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.

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