Mid-season snowmelt runoff from Montana's central mountains, raised the level of the Musselshell River at Mosby above flood stage for a few days.
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The episode as NWS GGW wrote it up.
Mid-season snowmelt runoff from Montana's central mountains, raised the level of the Musselshell River at Mosby above flood stage for a few days.
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 1, 9:17 AM MST, 2 hours 48 minutes earlier.
Area Forecast Discussion National Weather Service Glasgow MT 1017 AM MDT Fri Jun 1 2018 .DISCUSSION... Morning Update: Only update this morning was to the wind forecast, raising up the winds especially along the border with North Dakota where the pressure gradient looks to continue to tighten up a bit as the low deepens a bit more before the upper-level low catches up and fills in the low slowly over the weekend. Otherwise the forecast was still in good shape, and no further changes were necessary. Bigelbach Surface low and cold front will be along the Montana/Dakota border this morning. Upper level trough will move into Western Montana this morning. Moist and unstable air mass will linger over the forecast area today with occasional showers and thunderstorms across the region. The cold front will move slowly east across the Dakotas this afternoon and evening while the upper trough moves through Central and Eastern Montana. Tight surface gradient will allow for gusty northwest winds this afternoon. Will issue a Lake Wind Advisory for Fort Peck Lake. Areas near the North Dakota border may be unstable enough this afternoon for a severe thunderstorm. The surface low and upper low becomes stacked over Southeast Saskatchewan tonight. At this time, it looks like the effects of the wrap around moisture for the forecast area will be limited to the northeast corner of the state. Drier air will build into the remainder of the region tonight. High pressure builds into the forecast area on Saturday with mainly dry weather. However, gusty northwest winds will continue which will require the Lake Wind Advisory to remain in effect. Those winds will diminish Saturday evening as the center of the surface high passes through. Upper level ridge moves in on Sunday with dry weather and warmer temperatures. The ridge moves to the east on Monday. Expect a warm day ahead of a shortwave trough and cold front that moves through the area Monday Night with a chance of showers and thunderstorms. Another wave in WSW flow aloft in WSW flow aloft Tuesday Night could bring a chance of showers. Then, another wave could bring a chance of thunderstorms Thursday and Friday. Forrester && .AVIATION... Expected Flight Category: MVFR to VFR Synopsis: Lingering low pressure east of the region will keep chances for showers and some thunderstorms over northeast Montana today, before high pressure returns later this evening, clearing out much of the sky cover and returning the region to relatively dry conditions for the weekend. WIND: Northeast 10 to 20 kts early. Winds will become light and variable this morning. Then northwest winds 15 to 25 knots will develop this afternoon and continue at 10 to 20 knots tonight. Forrester/Bigelbach && .GLASGOW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory until 9 PM MDT Saturday For Fort Peck Lake for Central and Southeast Phillips...Central and Southern Valley...Garfield...McCone...Petroleum. && weather.gov/glasgow
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
805 AM MDT FRI JUN 1 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0308 AM NON-TSTM WND GST MCCLOUD 13WNW/BIG SHEEP 47.03N 105.80W
06/01/2018 M65 MPH PRAIRIE MT MESONET
MESONET STATION LCFM8, MCCLOUD 13WNW/BIG
SHEEP MTN.
&&
BCBThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The Musselshell River at Mosby (MSBM8) rose above the flood stage of 10 feet at 12:05 pm MST on June 1st, crested at 11.1 feet at 3:55 pm MST that same day, then fell back down below 10 feet at 7:07 am MST on June 2nd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2018Every state in 2018This day in weather historyWarnings in Montana, June 2018
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: 763104.