Thunderstorms fired up along a cold front that moved east through the area.
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 GGW wrote it up.
Thunderstorms fired up along a cold front that moved east through the area.
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 Glasgow, MT wrote its last area forecast discussion before the first event at Jun 30, 3:33 PM MST, 3 hours 52 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE GLASGOW MT 433 PM MDT WED JUN 30 2010 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH FRIDAY... ...UPDATED FOR SEVERE THUNDERSTORM WATCH 432 FOR AREAS SOUTH OF THE MISSOURI RIVER IN NORTHEAST MONTANA UNTIL 11 PM... THE WATCH IS IN EFFECT THIS WEDNESDAY AFTERNOON AND EVENING FOR SEVERE THUNDERSTORMS. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE. PREVIOUS DISCUSSION... THE CLASSIC THUNDERSTORM PATTERN OF SOUTHWEST FLOW ALOFT WILL CONTINUE OVER NORTHEAST MONTANA THROUGH THE SHORT TERM. TWO SLOW MOVING FRONTAL BOUNDARIES LOOK TO PROVIDE A FOCUS FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND EVENING. THE FIRST LIES ACROSS THE EASTERN ZONES NEAR THE NORTH DAKOTA BORDER. THIS ALSO COINCIDES WHERE THE BEST POTENTIAL INSTABILITY LIES. THE SECOND BOUNDARY LIES FROM SOUTHWEST MONTANA NORTHEAST TOWARDS THE HAVRE. THUNDERSTORMS ARE CURRENTLY FORMING ALONG THIS BOUNDARY OVER THE BEAVERHEAD MOUNTAINS IN SOUTHWEST MONTANA. THERE IS ALSO SOME SUPPORT FOR THUNDERSTORMS TO FORM OVER EASTERN MONTANA RATHER THEN MOVING IN AS BUFR SOUNDINGS DEPICT THE CAP ERODING BY PEAK HEATING LATE THIS AFTERNOON. EXPECT NOCTURNAL STORMS AGAIN TONIGHT AS QUASI-GEOSTROPHIC FORCING COUPLES WITH MIDLEVEL INSTABILITY AND MOISTURE. TEMPS WILL AGAIN BE ON THE WARM SIDE...ALTHOUGH NOT QUITE AS HOT AS LAST NIGHTS MINS. THURSDAY AGAIN LOOKS TO BE A GOOD THUNDERSTORM DAY...WITH EVEN BETTER INSTABILITY THEN TODAY. SOUTHEAST LOW LEVEL FLOW WILL RETURN TO THE AREA...USHERING IN HIGHER DEWPOINTS OUT OF THE DAKOTAS. SHEAR PROFILES CONTINUE TO SUGGEST WINDS AND HAIL AS THE MAIN THREATS...AND GIVEN DECENT DIRECTIONAL SHEAR AN ISOLATED TORNADO COULD BE POSSIBLE AS WELL. THURSDAY NIGHT THE THREAT FOR NOCTURNAL STORMS WILL AGAIN BE PRESENT AS THE FAVORABLE SOUTHWEST FLOW ALOFT CONTINUES. TEMPS WILL AGAIN REMAIN ABOVE NORMALS AS THE HOT AIRMASS REMAINS FOR ONE LAST NIGHT. FRIDAY COULD BE A VERY INTERESTING THUNDERSTORM DAY. A POTENT COLD FRONT WILL ENCOUNTER A VERY UNSTABLE AIRMASS DURING THE AFTERNOON AND EVENING HOURS. SAID FRONT WILL PROVIDE AN EXCELLENT TRIGGER FOR ORGANIZED THUNDERSTORM DEVELOPMENT. PREFRONTAL WARMING MAKE FOR ONE LAST HOT DAY AS TEMPS CLIMB INTO THE UPPER 90S ACROSS THE EAST. NORTHWEST WINDS BEHIND THE FRONT COULD NECESSITATE A LAKE WIND ADVISORY AND WILL NEED TO BE WATCHED. GILCHRIST .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY... EXTENDED PERIOD BEINGS FRIDAY NIGHT WITH CONTINUING SOUTHWEST FLOW ALOFT AS THE UPPER TROUGH SETTLES OVER THE NORTHERN ROCKY MOUNTAINS. THIS TROUGH HAS SENT A COLD FRONT EAST ACROSS THE MONTANA CENTRAL WHICH WILL BE POISED ALONG THE WESTERN BORDER OF OUR CWA. THIS COLD FRONT SHOULD MARCH ACROSS OUR ZONES FRIDAY EVENING GENERATING A FOCAL POINT FOR THUNDERSTORM DEVELOPMENT...MOST LIKELY STRONG ENOUGH TO CONTINUE THE SEVERE STRENGTH THUNDERSTORMS OF THE PREVIOUS SEVERAL DAYS. THE LATEST GFS BRINGS A FAIR AMOUNT OF MOISTURE WHICH SHOULD PRODUCE A GOOD SOAKING OVERNIGHT. AN EMBEDDED SHORT-WAVE WITHIN THE UPPER TROUGH SWEEPS ACROSS THE AREA BEHIND THE FRONT ON SATURDAY...FOCUSING ENHANCED 500MB VORTICITY WHICH COULD CONTINUE THE STORM ACTIVITY INTO SATURDAY EVENING. HOWEVER THE MUCH COOLER TEMPERATURES BEHIND THE COLD FRONT WILL PREVAIL THROUGH THE REMAINDER OF THE EXTENDED PERIOD. DIFFERENCES CROP UP AMONG THE EXTENDED MODELS SUNDAY AND BEYOND. THE GEM AND ECMWF DEVELOP A SHORTWAVE TROUGH OVER WESTERN MONTANA ON SUNDAY WHILE THE GFS HAS NO SUCH FEATURE...INSTEAD LIFTING THE TROUGH NORTH INTO CANADA. THE MODELS HINT AT DEVELOPING AN UPPER RIDGE TO OUR WEST AND VEERING UPPER FLOW AROUND TO THE NORTHWEST SOMETIME MONDAY NIGHT OR TUESDAY. OVERALL...INHERITED FORECAST REFLECTS THIS PATTERN. THEREFORE CHANGES WERE MINOR...BASED ON LATEST EXTENDED GUIDANCE OR WERE MOSTLY MADE FOR COORDINATION. SCT PREVIOUS DISCUSSION... THE LONG TERM FORECAST PERIOD IS CHARACTERIZED BY A SLOW MOVING AMPLIFIED UPPER LEVEL FLOW PATTERN...WITH A WESTERN CONUS TROUGH AND EASTERN CONUS RIDGE...BECOMING SLIGHTLY MORE ZONAL OVER THE NORTHERN TIER STATE AND QUITE STAGNANT SOUTHWARD OVER THE REMAINDER OF THE CONUS BY THE END OF THE EXTENDED PERIOD. THE PACNW UPPER TROUGH AND SOUTHWESTERLY FLOW ALOFT OVER MONTANA WHICH BROUGHT SHOWERS AND THUNDERSTORMS TO THE REGION BEGINNING TUESDAY EVENING AND WHICH IS EXPECTED TO SPAWN ADDITIONAL COPIOUS AMOUNTS OF PRECIPITATION ACROSS NEMONT THROUGH THE SHORT TERM...WILL STILL BE IN PLACE TO BEGIN THE LONG TERM PERIOD...STARTING THIS WEEKEND. A NUMBER OF SUBTLE DISTURBANCES EMBEDDED IN THE LEE SIDE OF THE TROUGHS SOUTHWESTERLY FLOW AND A FEW STRONGER SHORTWAVE TROUGHS WILL PINWHEEL NORTHEAST THROUGH MONTANA THROUGH EARLY NEXT WEEK AS THE LONG WAVE UPPER TROUGH AXIS FINALLY SLIDES THROUGH EASTERN MONTANA. AFTER IT DOES...NORTHWEST FLOW ALOFT...CLEARING SKIES...AND HIGH PRESSURE WILL RETURN TO THE REGION. STRONGEST FORCING FOR ASCENT WILL AFFECT OUR CWA FROM FRIDAY NIGHT THROUGH SATURDAY NIGHT...CORRESPONDING WITH MODERATE 500MB HEIGHT FALLS...PRIMARILY SATURDAY NIGHT THROUGH SUNDAY MORNING. BMICKELSON && .AVIATION... ALTHOUGH VFR CONDITIONS ARE EXPECTED TO PREVAIL FOR ALL TAF SITES THROUGHOUT THE ENTIRE TAF PERIOD...OCCASIONAL PERIODS OF MVFR AND EVEN IFR CONDITIONS WITH LARGE HAIL AND STRONG DAMAGING WINDS WILL RAISE CONCERNS WITH ANY OF THE STRONGER THUNDERSTORMS SET TO MOVE THROUGH THE REGION AS THE CURRENT UNSETTLED WEATHER PATTERN CONTINUES OVER THE NEXT SEVERAL DAYS. THESE CONCERNS HAVE BEEN FORTIFIED BY THE STORM PREDICTION CENTER WHICH HAS IDENTIFIED THE NORTHERN HIGH PLAINS...INCLUDING NEMONT...FOR A SLIGHT RISK FOR SEVERE THUNDERSTORMS THROUGH FRIDAY NIGHT. AMENDMENTS WILL BECOME NECESSARY AS SUDDEN THUNDERSTORMS DEVELOP. BMICKELSON/SCT && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 358 AM MDT WED JUN 30 2010 MTZ017>020-022>027-062-011000- CENTRAL AND SOUTHERN VALLEY-DANIELS-SHERIDAN-WESTERN ROOSEVELT- GARFIELD-MCCONE-RICHLAND-DAWSON-PRAIRIE-WIBAUX-EASTERN ROOSEVELT- 358 AM MDT WED JUN 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TODAY AND TONIGHT HIGH TEMPERATURES IN THE 90S WILL AFFECT THE AREA TODAY. AREAS ALONG THE YELLOWSTONE RIVER WILL HAVE HIGHS IN THE UPPER 90S. REMEMBER TO STAY HYDRATED AND TAKE REST IN THE SHADE IF YOU VENTURE OUTDOORS. ISOLATED TO SCATTERED THUNDERSTORMS WILL AFFECT NORTHEAST MONTANA TODAY AND TONIGHT. SOME STORMS WILL BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SEVERE THUNDERSTORMS ARE POSSIBLE THURSDAY AND FRIDAY WITH LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ016-021-059>061-011000- CENTRAL AND SOUTHEAST PHILLIPS-PETROLEUM-NORTHERN PHILLIPS- SOUTHWEST PHILLIPS-NORTHERN VALLEY- 358 AM MDT WED JUN 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS WILL AFFECT NORTHEAST MONTANA TODAY AND TONIGHT. SOME STORMS WILL BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SEVERE THUNDERSTORMS ARE POSSIBLE THURSDAY AND FRIDAY WITH LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Glasgow radar (KGGW), 187 km away, was scanning. The volume nearest the first event began at 02:26 UTC.
2 thunderstorm wind. Local standard time, as filed.
At 1925 MST in Terry, thunderstorm wind gusts broke large tree limbs and was accompanied by heavy rain. At 1950 MST in Fallon, thunderstorm wind gusts also broke more tree limbs.
Spotter 15 miles south of Wibaux at 1952 MST, estimated thunderstorm wind gust of 60 mph. Spotter in Wibaux at 2035 MST estimated thunderstorm wind gust of 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2010Every state in 2010This day in weather historyWarnings in Montana, June 2010
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: 244558, 244592.