Drought continued across parts of the area through June, especially in the eastern zones.
Every event with a place to put it; 10 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Drought continued across parts of the area through June, especially in the eastern zones.
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 May 31, 10:24 PM MST, 1 hour 36 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Glasgow MT 1124 PM MDT Sun May 31 2026 .KEY MESSAGES... - Periods of showers and isolated thunder will continue at times again for Monday, with lingering chances Tuesday and Wednesday. - Lake Wind Advisory for Fort Peck Lake remains in effect until 6 PM Monday. - The upper low will shift east on Wednesday with a brief dry window Wednesday evening into early Thursday. The next system will quickly approach from the west for a chance of thunderstorms Thursday evening. && .DISCUSSION... WEATHER PATTERN OVERVIEW: The slow moving upper low will continue to bring cool and wet conditions to NE Montana over the next couple of days. Look for periods of showers and an isolated thunderstorm to continue at times through at least Wednesday. Wednesday evening will see the low shift east with drying weather conditions. For Thursday, the next shortwave will track in from the west with the next round of thunderstorms. Some of the storms in the afternoon and evening may offer heavy rainfall. The potential for a few stronger storms will also be monitored as the high resolution model guidance better handles this in the coming days. Ensembles are also indicating warmer temperatures to return to the region for the second half of the week once that disturbance tracks east and the ridge axis becomes anchored over eastern Montana. FORECAST CONFIDENCE & DEVIATIONS: NBM was well suited to handle the forecast this cycle which captured overall expected trends well. In the coming days, refining the finer details surrounding pops and thunderstorm chances for Thursday may be appropriate. Confidence otherwise remains above average on cool and wet conditions at times through the middle of the week given excellent ensemble consensus. There is also increasing concern with regard to the next chance for thunderstorms across the area for Thursday. && .AVIATION... Updated: Monday June 1, 2026 at 0515Z. FLIGHT CATEGORY: MVFR to IFR. DISCUSSION: Periods of showers and isolated thunder will continue to bring intense downpours at times with reduced visibility. In addition, low stratus has become anchored over the area and is likely to continue at times into the taf cycle. WIND: West winds 15 to 20 kts, gusting in excess of 30 kts will continue into the evening hours. Winds will diminish overnight with south to southwest winds ranging from 5 to 10 kts at KGGW to KOLF, and becoming light and variable for KSDY and KGDV. && .GGW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory until 6 PM MDT Monday for Central and Southeast Phillips-Central and Southern Valley-Garfield-McCone- Petroleum. && weather.gov/glasgow
The national radar mosaic for the moment the first event began.
10 drought. Local standard time, as filed.
The southern edge of Petroleum County remained in D2 drought conditions through the entire month of June.
The eastern two-thirds of Daniels County was in D2 drought conditions for most of the month, then improved to D1 conditions on the last day of the month.
To begin the month, all but the eastern edge of Sheridan County was in at least D2 drought conditions, with D3 drought conditions arriving in the south-central portion of the county. On the last day of the month, drought impacts lessened to include only D2 drought conditions in that south-central portion of the county.
To begin the month, all but the eastern edge of Eastern Roosevelt County was in at least D2 drought conditions, with D3 drought conditions arriving through the central portion of that zone. On the last day of the month, drought impacts lessened to include only D2 drought conditions through that central portion of the zone.
To begin the month, all but the western edge of Western Roosevelt County was in D2 drought conditions. On the last day of the month, D2 drought conditions exited from this zone.
To begin the month, all but the far northeastern corner of Richland County was in at least D2 drought conditions, with D3 conditions through a wide central swath of the county. On the last day of the month, drought impacts lessened to include only D2 conditions through all but the western edge and the northeastern corner of the county.
To start the month, at least D2 drought conditions covered all of Dawson County, with widespread D3 conditions over central and northern and eastern portions of the county. On the last day of the month, D2 conditions covered all but the northwestern portion and a circle of D3 conditions remained over the central portion of the county.
For the entire month, at least D2 drought conditions were found in the far southwestern corner and the northern half of Wibaux County. For all but the last day of the month, D3 conditions were also present in the northwest corner of the county.
For the entire month, D2 drought conditions continued and persisted for the eastern half of Prairie County.
The eastern edge and northeastern portion of McCone County was in D2 drought conditions for most of the month, then improved to D1 conditions on the last day of the month.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2026Every state in 2026This day in weather historyWarnings in Montana, June 2026
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: 1330306, 1330307, 1330308, 1330309, 1330310, 1330312, 1330313, 1330314, 1330315, 1330316.