textproduct: Glasgow

KEY MESSAGES

- Triple digit temperatures expected for Friday through Sunday. Extreme Heat Warnings and Advisories are in effect for the 3 day period.

- Dry conditions most of the time but the could be an isolated thunderstorm tonight.

- Drier and breezier conditions Friday and Saturday will increase fire weather concerns. A Red Flag Warning is in effect Friday.

DISCUSSION

WEATHER PATTERN OVERVIEW: An upper ridge over the western states will bring the heat back to the area through the weekend. A weak frontal system will help to bring west winds Friday, Scattered storms are expected over southern Sask tonight and one could briefly flirt with the northern zones. Low chance pops are in place to cover that.

Abundant smoke from the Pacific NW fires is expected to stream into the area Friday and could knock visibility in some places to just 2 to 3 miles.

Winds tomorrow across Fort Peck Lake could be strong enough for a Lake Wind Advisory.

Will upgrade the Extreme Heat Watch to a Warning for most locations. Some in the northeast zones will have a Heat Advisory that will last into Sunday.

Will upgrade the Fire Weather Watch for Friday to a Red Flag Warning. Will not extend it into Saturday as winds do not look to be strong enough. Fire weather issues may arise Sunday with higher winds and low humidity. However zones 136 and 137 may not have the wind to reach the criteria.

The upper ridge next week tries to push east but an upper trough over the eastern US keeps it at bay. Expect a slight cooldown but temps will remain above normal with mainly dry conditions.

FORECAST CONFIDENCE & DEVIATIONS: Added thunderstorm chances to the forecast for tonight as some of the CAMS are hinting at this. No other changes to NBM.

Low confidence that there will be a thunderstorm somewhere in northeast Montana tonight, based on HREF. High confidence on breezy west winds on Friday and on the heat this weekend. TFJ

AVIATION

VFR.

Smoke from the Pacific Northwest will move into the area, dropping visibility to possibly near 3 miles for 2 to 3 hours Friday morning to afternoon (15z-22z).

DENSITY ALTITUDE issues will begin to return to the terminals Friday through the weekend.

WINDS: Will increase from the South tonight then switch to the West early Friday morning with a weak front moving through. TFJ

GGW WATCHES/WARNINGS/ADVISORIES

Red Flag Warning from 10 AM to 9 PM MDT Friday for Dawson/McCone/Prairie/Richland/Wibaux Counties-Northern Valley and Northern Phillips Counties-Southern Petroleum and Southern Garfield Counties-The Little Rockies-The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge.

Extreme Heat Warning from 10 AM Friday to 10 PM MDT Sunday for Central and Southeast Phillips-Central and Southern Valley- Dawson-Eastern Roosevelt-Garfield-McCone-Petroleum-Prairie- Richland-Southwest Phillips-Western Roosevelt-Wibaux.

Heat Advisory from 10 AM Friday to 10 PM MDT Sunday for Northern Phillips-Northern Valley.