textproduct: Glasgow

KEY MESSAGES

- A smoke plume over the region will reduce visibility at times today and tonight.

- Hot temperatures with highs in the 90s to near 100 are expected each day through Saturday or Sunday.

- Isolated showers and thunderstorms are possible at times today and tonight. Isolated to scattered storms are expected Wednesday afternoon and evening with a Marginal Risk of severe storms in the east.

DISCUSSION

WEATHER PATTERN OVERVIEW:

Upper ridging over the western U.S. will remain in place in varying degrees through at least Saturday. Hot weather will continue into the weekend with highs in the 90s most of the time with some locations near 100 at times. With heat impact being moderate in most areas today, will not issue any heat related headlines for now.

Satellite showcases a large smoke plume stretched from eastern Oregon across northern Montana. Smoke will continue to be over the area today and tonight with unhealthy air quality and variable visibilities.

Weak waves will move through the ridge at various times between today, Wednesday, and Thursday to bring chances for showers and thunderstorms to parts of the region. Models are showing increased instability and higher dew points Wednesday afternoon and evening with a cool front moving through that could lead to a few severe thunderstorms. Spc has a marginal risk along and east of MT 13 for Wednesday at this time with a threat of large hail and damaging winds.

High on Thursday will be a few degrees lower before the ridge strengthen Friday and Saturday. At this point, Saturday looks like it will be very hot with highs above 100 in most areas.

Ridge moves east Saturday night and upper trough moves for Sunday and Monday. A strong dry cold front on Sunday is expected to bring gusty NW winds followed by much cooler temperatures on Monday.

FORECAST CONFIDENCE & DEVIATIONS:

High confidence in the hot weather continuing through Saturday. Low confidence in timing any showers and thunderstorms.

NBM Deviations include HRRR/RAP blends to enhance visibility reductions due to smoke and tweaking pops at times today and tonight to account for weak waves moving through the area.

AVIATION

FLIGHT CATEGORY: VFR - MVFR.

DISCUSSION: Upper ridging will continue to provide hot temperatures to the region. Smoke and haze will impact visibility through the TAF period with MVFR conditions possible at times. There will be varying amounts of mid and high clouds across the region today and tonight with isolated showers and thunderstorms at times.

DENSITY ALTITUDE: Increased density altitude is expected the next few days temperatures near or over 100 in the afternoon and evening. Extra power and longer runway will be needed for takeoffs.

GGW WATCHES/WARNINGS/ADVISORIES

None.