Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
760 FXUS65 KBOI 202047 AFDBOI Area Forecast Discussion National Weather Service Boise ID 247 PM MDT Thu Jun 20 2024 .SHORT TERM...Tonight through Saturday night...A weak shortwave will continue to move across the area today, bringing increased clouds this afternoon. This will keep a threat of showers and thunderstorms, mainly over northeast Oregon over the Blue Mountains, north of Baker City and McCall in Idaho, and a slight chance of showers and thunderstorms in southern Twin Falls County and areas east. Drier air will move in from the west, but there will be enough moisture for showers and thunderstorms to form over the central ID mountains and southern Twin Falls County on Friday afternoon. Then the flow aloft shifts to the southwest, bringing warmer conditions. There is a 40-60 percent chance of temperatures in the lowest valleys exceeding 100 degrees on Saturday. .LONG TERM...Sunday through Thursday...The warming trend continues under southwest flow aloft on Sunday with a 50-70 percent chance of exceeding 100 degrees. A weak dry cold front moves through on Monday, with several degrees of cooling. Then, temperatures rebound on Tuesday as a trough off the Pacific NW coast amplifies the ridge over southwest Idaho and southeast Oregon. Temperatures warm to near 100 degrees in the lowest valleys on Wednesday. A cool Gulf of Alaska trough is expected to move inland starting Thursday, initiating a cooling trend. Ensembles show good agreement on this shift occurring late next week. && .AVIATION...VFR. Slight chance of thunderstorms north of KMYL and KBKE this evening and south of KTWF. Surface winds: E-SE 5-15 kt. Winds aloft at 10kft MSL: S-SE 10-15 kt. KBOI...VFR. Surface winds SE 5-10kt, switching to NW 5-10kt after 18z/Thu. Weekend Outlook...VFR. Slight chance of thunderstorms northeast of KMYL and south of KTWF Sat afternoon. Hot temperatures will bring high density altitudes Saturday and Sunday. Surface winds W-SW 10-20kt during the afternoons, light during the night. && .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 SHORT TERM...KA LONG TERM....KA AVIATION.....KA