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Area Forecast Discussion
Issued by NWS Glasgow, MT
Issued by NWS Glasgow, MT
272 FXUS65 KGGW 111951 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 151 PM MDT Sun Aug 11 2024 .DISCUSSION... KEY MESSAGES: - Scattered showers and isolated thunderstorms through this afternoon, mainly south of the Missouri River. - Temperatures will gradually climb to slightly above average over the next few days. - Another system will help bring scattered showers and storms to the area throughout the week, with strong storms Tuesday into Tuesday night in eastern Montana. WEATHER PATTERN OVERVIEW: The low pressure center over the southeastern part of the GGW CWA spawned a few more thunderstorms than CAMs were indicating in Richland County. However, this activity will the last through late this afternoon before pushing into ND. The Yellowstone River Valley has the best opportunity for fog tonight due to higher dewpoints from today`s rainfall. A reduction in visibility is expected where fog does develop, and there is moderate (40 percent) confidence of this fog diminishing by 10 AM Monday. With capping in place across the low elevations of northeast MT on Monday evening, storm activity will be inhibited for the most part. However, there is moderate (50 percent) confidence of a few dying storms to impact the western portion of the CWA. Then Tuesday, a shortwave trough ahead of an oncoming trough in the Pacific northwest will make its way into northeast MT. Temperatures will be above average ahead of this shortwave. With moisture advection of upper 50s to mid 60s dewpoints along with daytime heating ahead of this disturbance, breaking the cap will be much easier on Tuesday than it has been for much of August. Although confidence is low on exact location and timing, current CAMs such as NAM NEST and HRW FV3 indicate that storms may initiate on a line from Saco to Jordan before transitioning eastward. Wednesday onward will feature occasional shortwave troughs passing through the region. However, there is low confidence on timing and location of these disturbances. Temperatures are expected to remain near average. FORECAST CONFIDENCE & DEVIATIONS: There is high confidence in a warming trend through Tuesday before temperatures moderate after Tuesday. There is moderate to high confidence of strong thunderstorms occurring on a line from Saco to Jordan eastward on Tuesday. Although there is moderate to high confidence in at least isolated convection each day after Tuesday, there remains low confidence on total accumulation. -Zanker/Stoinskers && .AVIATION... LAST UPDATED: 2045Z FLIGHT CAT: VFR, MVFR for KGDV from 09Z to 16Z. Isolated IFR in thunderstorms. DISCUSSION: A weak low pressure system is expected to continue influencing KSDY and KGDV through 02Z, with brief reductions to IFR in scattered thunderstorms. Although VFR will be the main flight category for TAF sites, there is low to moderate (30 to 50 percent) confidence of fog developing near KGDV tonight, which may drop the category down to MVFR in the morning. WINDS: Southeast at 7 to 15 knots. Erratic winds near thunderstorms. && .GGW WATCHES/WARNINGS/ADVISORIES... None. && $$ weather.gov/glasgow