Select NOAA-NWS Forecast Office Text Products
(Product availability varies with seasons, forecast office, and weather.)
Forecast Discussion for Boise, ID
To Select Another NWS Office Click on Map or Choose from List
Select Forecast Office: | Select Product: |
000 FXUS65 KBOI 251614 AFDBOI Area Forecast Discussion National Weather Service Boise ID 1014 AM MDT Thu Apr 25 2024 .DISCUSSION...Radar is picking up isolated showers this morning behind last night`s frontal passage. Daytime heating and increasing instability will expand shower coverage this afternoon across higher terrain. A more organized line of showers and possible thunderstorms will take shape over eastern Oregon late this afternoon in advance of an upper trough. Gusty winds to 40 mph will accompany the line as it crosses SE Oregon and into SW Idaho early tonight. Have added a slight chance of thunderstorms to SE Oregon zones for this afternoon/evening. && .AVIATION...Generally VFR this morning, then areas of MVFR moving into eastern Oregon this afternoon as showers/weak thunderstorms develop. This area will move into southwest Idaho this evening. Surface winds: W to NW 5-15 kt. Gusts to 30 kt in stronger showers, and along/just behind the cold front tonight. Winds aloft at 10kft MSL: W-NW 15-25 kt. KBOI...VFR under mid to high level clouds today. Surface winds: NW 5-15 kt, with gusts near 20 kt this afternoon. A cold front will arrive this evening with light rain showers along and behind the front. The front will also lower ceilings to 5000-7000 ft AGL and bring brief wind gusts to 30 kt. Thunderstorm chances less than 15% tonight. Weekend Outlook...Scattered to numerous showers and isolated thunderstorms will continue into Friday, with the highest coverage in the mountains. Periods of MVFR conditions and mountain obscuration in showers. Snow levels 5500-6500 ft MSL. Scattered showers will continue into Saturday and Sunday over the mountains, with mostly dry conditions and decreasing clouds elsewhere. Surface winds generally W-NW 10-25 kt, with the strongest winds Friday night and Saturday from KMUO east through the Magic Valley where gusts up to 40 kt will develop. && .PREV DISCUSSION... SHORT TERM...Today through Saturday night...A weak cold front continues to push southeastward this morning. Isolated showers continue ahead of the front near the Nevada border, but the drier/stable air behind the front will end the showers by sunrise. The dry conditions will be short-lived as a moist upper trough enters the Pacific Northwest. A cold front is expected to move through SE Oregon later this afternoon and SW Idaho tonight, accompanied by showers. Most areas have a decent chance of receiving measurable rainfall, with the greatest chances (>60 percent) in the higher elevations. The axis of the trough reaches our area on Friday for more showers, along with a slight chance of afternoon thunderstorms. Snow levels lower to around 6000 feet with some accumulations expected on the higher mountains. Total snowfall amounts of 3 to 6 inches are expected on the Steens Mountain in Harney County and in central Idaho above 6500 feet from Friday morning through Friday night. Most areas will experience breezy conditions on Friday, approaching advisory levels in s-central Idaho in the afternoon. Drier conditions arrive from the west and reach SE Oregon on Saturday, while residual moisture keeps a chance (30-50 percent) of showers in the higher elevations of SW Idaho. The low pressure to the east and high pressure to the west will enhance the gradient for widespread windy conditions, especially in southern Idaho east of Boise where a Wind Advisory may be warranted. Temperatures will be a few degrees above normal today and near normal Friday and Saturday. LONG TERM...Sunday through Thursday...An upper level trough will move into the Pacific Northwest on Sunday and through our area on Monday. The center of the trough is expected to remain to our north, bringing a 30-60% chance of showers to the central ID mountains with a 20% chance or less elsewhere. Winds will remain breezy Sunday and strengthen on Monday as the trough moves to our east. Temperatures will be near normal both days. Models are in better agreement about the pattern Tuesday and Wednesday, with a deep upper low stalling off the coast and an upper level ridge amplifying over the Plains. Temperatures are forecast to rise to around 10 degrees above normal by Wednesday under southwesterly flow aloft. Mostly dry conditions are also expected along with lighter winds. Forecast confidence decreases on Thursday as the low moves inland, but this should bring cooler temperatures and an increasing chance of precipitation to the area. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...DG AVIATION.....SP SHORT TERM...BW LONG TERM....ST |
Previous Forecast Discussions may be found at
NWS Boise, ID (BOI) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)
Products Courtesy of NOAA-NWS
NWS Information Parsing Script by Ken True at Saratoga Weather - WFO and Products Scripts by SE Lincoln Weather.
Mapping by Curly at Michiana Weather and by Tom at My Mishawaka Weather.