textproduct: Glasgow

KEY MESSAGES

- Isolated thunderstorms remain possible along the MT/ND Border early this morning and then again across the area this afternoon and evening.

- Seasonably cool temperatures and frequent chances for showers and thunderstorms look to continue this week.

- A Lake Wind Advisory continues for Fort Peck Lake continues from 2 PM today through 6 PM Wednesday.

DISCUSSION

WEATHER PATTERN OVERVIEW:

An initial round of isolated storms is still expected to develop early this morning along the MT/ND border and is reflected in both the HREF and NBM guidance. Additional storms will likely concentrate along the MT/ND border this afternoon and our SW zones. This is reflected in the max updraft helicity in the HREF guidance as well as the ensemble 40dbz overlay. That said, with the proximal trough there is enough instability that a lone isolated afternoon or evening storm may occur anywhere across NE Montana. For now, HREF consensus matched the NBM well so left these central areas dry, but future shifts can monitor for a tweak. Nevertheless, the greatest risk for a strong to severe thunderstorm looks to be anchored into the Dakotas, eastward for day 1 per SPC.

Meanwhile, gusty west winds will develop this afternoon, likely persisting into at least Wednesday if not beyond. The Lake Wind Advisory for Fort Peck Lake remains.

Additional showers and thunderstorms are likely at times through the end of the week with seasonably cool temperatures given the trough in place.

FORECAST CONFIDENCE & DEVIATIONS:

NBM was left alone for now through the forecast period. There is excellent consensus among the HREF ensembles and NBM on thunderstorm location for today. That said, one or two members show a lone or rogue pop up shower or storm across central zones late this afternoon or evening. For now the risk is low enough, kept these areas dry, but worth monitoring.

Confidence then remains above average for seasonably cool and unsettled weather to continue this week given the overall handling of the trough. Confidence in exact timing, placement, and amount of precipitation remains low to moderate given the mesoscale detail still to be worked out a larger time scales.

AVIATION

LAST UPDATED: TUESDAY JUNE 9, 2026 AT 06:30Z.

FLIGHT CAT RANGE: VFR.

DISCUSSION: Most of the time, dry conditions will continue over terminals. However, there may be isolated thunderstorms near KSDY between 07Z and 10Z this morning. Additional isolated thunderstorms are possible this afternoon and evening. Any storm could bring shifting winds and brief reductions in visibility, but they are expected to be very hit or miss.

WINDS: Southeast winds this morning at 5 to 15 kts will turn west between 18Z and 22Z and increase, ranging 10 to 20 kts, gusting to 25 kts. These winds will persist into Wednesday.

GGW WATCHES/WARNINGS/ADVISORIES

Lake Wind Advisory from 2 PM this afternoon to 6 PM MDT Wednesday for Central and Southeast Phillips-Central and Southern Valley-Garfield-McCone-Petroleum.