A high pressure ridge over the region was pushed east by a steadily advancing upper-level trough extending from Central Alberta to northern California. Small pockets of instability and moisture associated with a transient shortwave combined with generally unstable conditions to produce scattered thunderstorms along the Continental Divide and Southwest MT before spreading into Central MT during…
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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 TFX wrote it up.
A high pressure ridge over the region was pushed east by a steadily advancing upper-level trough extending from Central Alberta to northern California. Small pockets of instability and moisture associated with a transient shortwave combined with generally unstable conditions to produce scattered thunderstorms along the Continental Divide and Southwest MT before spreading into Central MT during the evening.
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 Great Falls, MT wrote its last area forecast discussion before the first event at Jul 28, 7:53 PM MST, 7 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 447 AM MDT SUN JUL 28 2013 MTZ008>015-044>055-291100- BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL- CASCADE-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON- TOOLE-LIBERTY-EASTERN PONDERA-BLAINE- SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON-JUDITH BASIN-FERGUS- JEFFERSON-BROADWATER-MEAGHER-GALLATIN- 447 AM MDT SUN JUL 28 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP IN SOUTHWEST MONTANA AND ALONG THE ROCKY MOUNTAIN FRONT THIS AFTERNOON AND SPREAD INTO CENTRAL MONTANA THIS EVENING. WIND GUSTS AROUND 40 TO 45 MPH AND SMALL HAIL WILL BE POSSIBLE WITH SOME OF THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A SIGNIFICANT SHIFT TO COOLER AND WETTER CONDITIONS IS EXPECTED FOR THE LATTER HALF OF THIS WEEK AS A PACIFIC WEATHER SYSTEM BRINGS IN WIDESPREAD MOISTURE...RESULTING IN SEVERAL PERIODS OF SHOWERS AND THUNDERSTORMS FROM WEDNESDAY EVENING THROUGH FRIDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
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</html>The Great Falls radar (KTFX), 192 km away, was scanning. The volume nearest the first event began at 02:59 UTC.
3 thunderstorm wind, 1 hail. Local standard time, as filed.
Hail measuring 1.00 inches (quarter sized) was reported 26 mi NW of Santa Rita, MT. Mix of quarter and pea sized hail accumulated to approximately a foot deep around buildings during storm.
High winds measured at 51KT (59MPH) were reported 1 mi SSW of Rudyard, MT.
High winds measured at 54KT (62MPH) were reported in Galata, MT.
High winds measured at 51KT (59MPH) were reported 13 mi N of Chester, MT.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2013Every state in 2013This day in weather historyWarnings in Montana, July 2013
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: 470565, 470563, 470564, 470566.