textproduct: Glasgow

KEY MESSAGES

- A stray shower is possible tonight into Tuesday.

- Warm and dry weather will prevail through next weekend. Temperatures will stay well above seasonably average over the next 7 days.

DISCUSSION

Upper ridging has flattened into a zonal flow regime across eastern Montana and the Northern High Plains, bringing a brief reprieve from the highs in the upper 60s.

A fast moving shortwave will eject out of the Pacific Northwest and over the Northern Rockies and into eastern Montana and Wyoming overnight and Tuesday. This will likely result in increased cloud cover and perhaps a stray shower, though most ensembles suggest spotty coverage QPF and remaining mainly in southwest Montana.

Ensembles show a large high amplitude upper ridge becoming established over the western CONUS for the second half of the week which will result in prominent dry weather conditions and warmer temperatures as highs return to the 50s and 60s for much of NE Montana.

FORECAST CONFIDENCE & DEVIATIONS: No deviation from the NBM.

There remains uncertainty with respect to just how quickly the ridge is broken down, and the strength and location of the low off the coast of Baja California.

AVIATION

LAST UPDATED: 0630Z.

FLIGHT CAT RANGE: VFR.

DISCUSSION: VFR conditions today aside from mid to high level clouds.

WIND: Northeast winds will gradually decrease through the morning. Winds become predominantly east at 5 to 10 kts by 16Z today. Light and variable winds in the afternoon will last overnight.

LLWS: LLWS over KOLF, KSDY, KGDV through 12Z.

GGW WATCHES/WARNINGS/ADVISORIES

Lake Wind Advisory until 3 AM MST Monday for Central and Southeast Phillips-Central and Southern Valley-Garfield-McCone- Petroleum.