Extreme heat continued across the Intermountain West leading to afternoon thunderstorm development and strong to damaging downburst winds.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOI wrote it up.
Extreme heat continued across the Intermountain West leading to afternoon thunderstorm development and strong to damaging downburst winds.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boise, ID wrote its last area forecast discussion before the first event at Jun 29, 7:45 PM MST, 1 hour 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 845 PM MDT MON JUN 29 2015 .DISCUSSION...MOST OF THE THUNDERSTORM ACTIVITY THIS EVENING HAS BEEN ACROSS OUR SOUTHERN ZONES /MALHEUR COUNTY THROUGH WESTERN MAGIC VALLEY/ NORTHWEST OF THE UPPER LEVEL RIDGE CENTER. ONLY A FEW STORMS DEVELOPED ACROSS OUR NORTHERN ZONES TODAY. MOST OF THE THUNDERSTORMS ASSOCIATED WITH SHORTWAVE MOVING ACROSS WASHINGTON STATE THIS EVENING INITIATED FURTHER NORTH AND EAST ACROSS NORTHERN IDAHO AND WESTERN MONTANA THAN PREVIOUSLY FORECAST. HAVE UPDATED THE FORECAST FOR LOWER POPS ACROSS OUR NORTHERN ZONES THIS EVENING. STORMS ACROSS OWYHEE COUNTY THROUGH THE MAGIC VALLEY HAVE PRODUCED STRONG OUTFLOW WINDS 35 TO 55 MPH AS WELL AS LIGHTNING AND BRIEF HEAVY RAIN WHICH WILL CONTINUE THROUGH SUNSET. AT LEAST ONE NEW FIRE HAS BEEN REPORTED FROM LIGHTNING WHICH IS 50-ACRES NEAR ROGERSON. A LITTLE COOLER ON TUESDAY WITH THUNDERSTORMS DEVELOPING AGAIN NEAR THE NEVADA BORDER. && .AVIATION...VFR WITH SCT-BKN HIGH LEVEL CLOUDS. THROUGH 06Z...ISOLATED SHOWERS AND THUNDERSTORMS...EXCEPT SCATTERED ACTIVITY SOUTH AND EAST OF KMUO. MAINLY NORTHWEST SURFACE WINDS 12 KNOTS OR LESS...EXCEPT GUSTY AND ERRATIC WINDS TO 45 KNOTS NEAR THUNDERSTORMS AND ASSOCIATED OUTFLOWS. WINDS ALOFT...WESTERLY 5-15 KNOTS UP THROUGH 10K FEET MSL. && .PREV DISCUSSION... SHORT TERM...TONIGHT THROUGH WEDNESDAY...WEAK UPPER LEVEL TROUGH MOVING NORTH ALONG THE WEST COAST OF WASHINGTON LATE THIS AFTERNOON WILL MOVE EAST OVER NORTHERN IDAHO TONIGHT. THIS TROUGH IS WEAKENING THE RIDGE AS IT RIDES OVER THE TOP AND IS BRINGING MOIST SOUTHERLY FLOW TO THE AREA. THUNDERSTORM ACTIVITY SLOW TO GET STARTED THIS AFTERNOON...BUT STILL EXPECTING ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS THROUGH THE EVENING. PRECIPITATION WITH ANY THUNDERSTORMS WILL BE CONFINED TO JUST UNDER THE CORE OF THE STORM WITH THE MAIN THREAT FROM THUNDERSTORMS IS GUSTY OUTFLOW WINDS TO AROUND 50 MPH. EXPECT THUNDERSTORMS WILL DISSIPATE BY MIDNIGHT BUT COULD SEE ISOLATED STORMS CONTINUE THROUGH THE NIGHT OVER THE WEST CENTRAL MOUNTAINS AND THE HIGHER TERRAIN OF SOUTHERN TWIN FALLS COUNTY. MOSTLY DRY CONDITIONS OVER THE REGION TUESDAY AS THE RIDGE REBUILDS TO THE NORTH...BUT ENOUGH MOISTURE TRAPPED UNDER THE RIDGE FOR ISOLATED SHOWERS AND THUNDERSTORMS OVER ZONES ALONG THE NEVADA BORDER. RETURN TO DRY CONDITIONS FOR WEDNESDAY. TEMPERATURES WILL REMAIN HOT ACROSS THE REGION AVERAGING 10 TO 13 DEGREES ABOVE NORMAL. LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...AN UPPER LEVEL RIDGE IS EXPECTED TO REMAIN MOSTLY STATIONARY OVER THE GREAT BASIN /CENTERED OVER NEVADA/ FOR THE EXTENDED. EXPECT DRY CONDITIONS WITH TEMPERATURES 10-15 DEGREES ABOVE NORMAL. BY SATURDAY/SUNDAY THE UPPER LEVEL RIDGE SHIFTS EASTWARD TOWARDS FOUR CORNERS AREA OF THE DESERT SOUTHWEST. AS THIS TRANSITION OCCURS SOUTHERLY FLOW WILL DEVELOP ALLOWING MONSOONAL MOISTURE TO CREEP NORTHWARD. THIS PATTERN WOULD FAVOR INCREASED CHANCES OF THUNDERSTORMS AFTER SATURDAY...HOWEVER CONFIDENCE REMAINS LOW ON THE DETAILS OF THIS PATTERN CHANGE. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...RED FLAG WARNING UNTIL MIDNIGHT MDT TONIGHT IDZ423. OR...NONE. && WEATHER.GOV/BOISE DISCUSSION...JDS AVIATION.....BW PREV SHORT TERM...JA PREV LONG TERM....KA/WH
The Boise radar (KCBX), 66 km away, was scanning. The volume nearest the first event began at 04:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
A trained spotter reported 4 inch tree branches down on numerous trees from thunderstorm gusts. Lightning struck a fence post causing the post to catch on fire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2015Every state in 2015This day in weather historyWarnings in Idaho, June 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 582248.