textproduct: Glasgow

KEY MESSAGES

- Upper ridging will keep above average temperatures in place through the weekend. On Sunday, an isolated 100 degree temperature is possible in the Yellowstone River Valley.

- Look for the next chance for thunderstorms Friday evening into Friday night, with an isolated severe wind gust possible. Some storms may also produce heavy rainfall.

DISCUSSION

WEATHER PATTERN OVERVIEW:

Upper ridging will continue to bring very warm temperatures to the region through the weekend. Isolated triple digit heat is possible in the Yellowstone corridor from Terry to Sidney.

Weak embedded shortwaves will continue to tap deep monsoonal moisture to offer daily chances for thunderstorms. High precipitable water values will mean any given storm could be a prolific rainfall producer. In addition, the SPC has included the western zones of Phillips and Petroleum Counties for today in a marginal risk for severe thunderstorms.

FORECAST CONFIDENCE & DEVIATIONS:

A few minor adjustments to pops were necessary given recent trends for showers and thunder early this morning across the southern zones. Patchy fog was also added given the high humidity and near saturated boundary layer beneath the ridge.

AVIATION

UPDATED: Friday July 17 at 0645Z.

FLIGHT CATEGORY: VFR.

DISCUSSION: Dry weather conditions are expected through this evening. Late tonight, isolated to scattered thunderstorms pushing in from the west may lead to reductions in visibility.

WIND: East to southeast winds will prevail at 5 to 15 kts most of the time with occasional gusty conditions near any thunderstorms.

GGW WATCHES/WARNINGS/ADVISORIES

None.