A continued stagnant weather pattern brought a round of thunderstorms during the afternoon and evening hours, with a couple of storms reaching severe levels.
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The episode as NWS GGW wrote it up.
A continued stagnant weather pattern brought a round of thunderstorms during the afternoon and evening hours, with a couple of storms reaching severe levels.
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 4, 1:49 PM MST, 2 hours 29 minutes earlier.
Area Forecast Discussion National Weather Service Glasgow MT 249 PM MDT Sun Jun 4 2023 .DISCUSSION... AFTERNOON UPDATE: Daytime heating and ample low-level moisture from recent rainfall are producing a few pop-up showers and thunderstorms again today that will last into the evening. The greatest coverage is favored over the higher terrain in Phillips and Petroleum counties, but any wetting rains will be localized. Otherwise, there is weak dynamics in place over the next few days where isolated convective chances remain, but the focus will be on the warm temperatures. While not quite enough to create a significant heat risk as long as dew points drop slightly, there is high confidence that highs will be near 90 with lows in the 60s for the next few days (about 15 degrees above normal for early June). Some ridging currently over the area will slowly push east, with another low pressure system and stationary front setting up over the region by Thursday. This will bring slightly cooler temperatures and increased thunderstorm chances. The focus is currently over the higher terrain of central Montana, though there is already moderate confidence for at least localized amounts of 1" or more over southern Phillips and Petroleum counties through next weekend. -Zanker MORNING DISCUSSION: With calm winds and low dewpoint depression, patchy fog is expected across the western two thirds of our CWA this morning, especially along the Milk River Valley. Significant visibility reduction is not expect any fog that develops is expected to burn off by 10 AM this morning. Otherwise, there were no major changes to the going forecast with the morning update. There was a slight reduction of QPF for this afternoon which falls in line with the less than ideal convective environment expected through tonight. Isolated showers are possible today through early Thursday morning with minimal (<0.1 inch) accumulation generally expected. -thor && .AVIATION... UPDATED: 2030Z FLIGHT CAT RANGE: VFR DISCUSSION: Isolated showers and thunderstorms are in the offing again through this evening, particularly for KGGW. However, minimal to no impacts are expected should they pass over. Otherwise, just look for a few mid-level clouds. WINDS: Prevailing out of the southeast at 5-15 knots. && .HYDROLOGY... Multiple streams, creeks, and rivers continue to respond to recent heavy rainfall received in the last few days. Updates from emergency managers advise that water level rises have begun slowing. Lowland flooding continues to occur with other streams near bank level. As some of the lowland flooding continues to work its way into the river system, we have been monitoring downstream locations for flooding potential. As of this update, Beaver Creek near Hinsdale continues to slow in its rise, suggesting the current forecasted crest of 16.8 ft (Moderate Flood Stage) is on track at the moment. Downstream, the Milk River at Tampico is not currently forecasted to reach flood stage but is rising faster than previously expected which does bring some concern regarding the final crest. Nonetheless, confidence remains low that Tampico will rise above flood stage so no river flood products will be issued with this update. Current guidance for the Milk River in Nashua is on track with the crest expected to remain below flood stage. Currently, the only location along the Milk River in our CWA experiencing flooding is here in Glasgow where two separate crests are forecasted over the next week. The first crest will be as a result of the flooding around Hinsdale and Tampico including Beaver Creek. As of 2 PM MDT, the Milk River at Glasgow is in Minor Flood Stage and expect to remain within this level, cresting over 28 ft by tonight before dropping slightly by Tuesday. This rise has been faster than anticipated due to the extreme rainfall in west- central Valley county flowing eastward, so will need to closely monitor levels tonight as they approach moderate flood stage (29 ft). A second crest is expected later in the week as floodwaters currently in Blaine county begin making their way downstream. The only concern regarding the arrival of the second crest is it is possible it may coincide with the heavy rainfall expected Thursday/Friday. With the latest information available, it appears unlikely that the Milk River will reach anything above Minor Flood Stage for the second crest, however, this is a dynamic situation and will be closely monitored during future shifts for any changes. The next concern for area-wide flooding is Thursday and Friday with WPC placing our western zones in a slight risk for excessive rainfall on Thursday. Storm total QPF values for Thursday through Sunday have Petroleum, southern Phillips, and western Garfield counties above 1 inch which may be locally higher depending on afternoon convection. Anyone planning outdoor activities should closely monitor the latest forecasts and any possible flood advisory or warning that may be issued. Alternate plans will need to be considered in order to address public safety concerns. Current headlines as of 2 PM Sunday: -River Flood Warning for the Milk River at Glasgow until 3 PM Friday. -Flood Warning for Valley county including Hinsdale until 10 AM Tuesday. -Flood Warning Garfield County, including Jordan until 10 AM Monday. && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && weather.gov/glasgow
The Glasgow radar (KGGW), 189 km away, was scanning. The volume nearest the first event began at 23:16 UTC.
1 thunderstorm wind. Local standard time, as filed.
A trained spotter in the town of Savage estimated thunderstorm wind gusts of at least 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2023Every state in 2023This day in weather historyWarnings in Montana, June 2023
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: 1094821.