973
FXUS65 KBOI 120253
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
853 PM MDT MON AUG 11 2025
DISCUSSION
AN UPPER RIDGE STRENGTHENS FURTHER ON TUESDAY,
ALLOWING FOR DRY CONDITIONS AND EVEN WARMER TEMPERATURES AS
HIGHS REACH OR EXCEED 100F IN THE LOWER VALLEYS. A HEAT
ADVISORY IS IN EFFECT FOR THE LOWER TREASURE VALLEY AND MALHEUR
COUNTY TUESDAY AFTERNOON AND EVENING. NO UPDATES.
AVIATION
VFR WITH CLEAR SKIES. SURFACE WINDS: VARIABLE LESS
THAN 10 KT. WINDS ALOFT AT 10KFT MSL: N-NW 5-15 KT.
KBOI...VFR WITH CLEAR SKIES. SURFACE WINDS: NW AROUND 5 KT
BECOMING SE TO 5 KT AFTER 12/05Z.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT...THE HEAT PEAKS
ON TUESDAY AS A SURFACE THERMAL TROUGH TRANSFERS TO THE ID/OR
BORDER. IT'S THESE LOWER ELEVATIONS ZONES THAT WILL SEE THE
HOTTEST TEMPERATURES AND HAVE BEEN INCLUDED IN A HEAT ADVISORY
WITH HIGHS RUNNING 100-104. OTHER LOWER ELEVATION ZONES WILL BE
HOT AS WELL, WITH HIGHS UP TO 100F. WEDNESDAY WILL SEE AN UPPER
TROUGH SETTLE INTO PAC NW ACTING TO TAKE A COUPLE OF DEGREES
OFF OF TUESDAY'S HIGHS AND INTRODUCE MORE WIDESPREAD BREEZY
CONDITIONS DURING THE AFTERNOON. MID-LEVEL MOISTURE SKIRTING OUR
SOUTHERN ZONES WILL ADD A SLIGHT CHANCE OF THUNDERSTORMS ALONG
THE ID/NV BORDER SOUTH OF THE SNAKE PLAIN WEDNESDAY AFTERNOON.
LONG TERM...THURSDAY THROUGH MONDAY...A LARGE RIDGE OF HIGH
PRESSURE WILL CONTINUE STEERING OUT OF THE AREA ON THURSDAY AS A
LONGWAVE TROUGH OVER WESTERN CANADA DIGS INTO THE NORTHWEST AND
GREAT BASIN REGIONS. THIS TROUGHING WILL RETURN A SLIGHT COOLING
TREND, BRINGING PEAK TEMPERATURES BACK DOWN INTO THE LOWER 90S
ACROSS LOWER ELEVATIONS THROUGHOUT THE ENTIRE EXTENDED FORECAST
PERIOD. ISOLATED THUNDERSTORMS ARE EXPECTED OVER THE UPPER GREAT
BASIN AND LOWER MAGIC VALLEY ON THURSDAY. CONTINUOUS TROUGHING
OVER BRITISH COLUMBIA AND THE PACIFIC NORTHWEST COAST WILL
CONTINUE THE COOLING TREND AND THUNDERSTORM POTENTIAL ON FRIDAY.
THIS TROUGHING PATTERN, ALONG WITH A PROJECTED INFLUX OF
MONSOONAL MOISTURE FROM THE DESERT SOUTHWEST, WILL BRING THE
HIGHEST POTENTIAL FOR AFTERNOON SHOWERS/THUNDERSTORMS SATURDAY
THROUGH MONDAY. FOR NOW, THE HIGHEST CHANCES ARE PRIMARILY OVER
HIGHER ELEVATIONS.
BOI WATCHES/WARNINGS/ADVISORIES
ID...HEAT ADVISORY FROM NOON TO 9 PM MDT TUESDAY IDZ012.
OR...HEAT ADVISORY FROM NOON MDT /11 AM PDT/ TO 9 PM MDT /8 PM PDT/
TUESDAY ORZ063-064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
DISCUSSION...BW
AVIATION.....BW
SHORT TERM...DG
LONG TERM....JY
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