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Area Forecast Discussion · GGW

Glasgow, Montana

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92 Airport Road, Glasgow, MT 59230, United States of America

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Product header AFDGGW·FXUS65 KGGW 311921
Title
Area Forecast Discussion
Issued by
National Weather Service Glasgow MT
AWIPS ID
AFDGGW
WMO heading
FXUS65 KGGW 311921
Sequence
289

KEY MESSAGES

  • Patchy fog continues through tomorrow morning.
  • Light rain spreads north in the afternoon, continuing into trick or treating hours.
  • Widespread precipitation begin on Monday as a frontal system moves across the region.

DISCUSSION

Upper ridge over the northern plains will slowly drift eastward through the weekend as an upper trough digs into the western states. Southwest flow and weak embedded shortwaves will bring periodic chances for rain into the region.

Light rain will continue to slowly move northeast through the evening and linger overnight. Most locations look to have a damp and chilly Halloween evening. Fog will continue to impact portions of the region through the morning with some locally dense fog, reducing visibility in spots to 2 mile or less.

As the Pacific upper trough moves through the Great Basin, a Colorado low is expected to develop ahead of it. This will spread precipitation northward, and will generally favor the Yellowstone basin for Sunday night into Monday. Splitting in the upper trough near the Canadian boarder will keep cold air from being drawn southward, and result in little to no mixed precipitation or snow. As the surface low deepens, an increase in winds will result by Monday afternoon.

A progressive, unsettled pattern will keep next week interesting with repeated upper level troughs.

FORECAST CONFIDENCE & DEVIATIONS

Adjusted PoPs by blending SREF for slightly expanded coverage. Otherwise no changes to NBM.

A lot of uncertainty regarding fog, low cloud and precipitation today.

System for Monday continues to slide southward, which is common, and could result in less precipitation, especially across the north, than expected.

AVIATION

LAST UPDATED: 1900Z

FLIGHT CAT RANGE: MVFR, IFR during patchy fog.

DISCUSSION: Lingering MVFR/IFR stratus will continue through tomorrow. Low stratus and patchy fog cannot be ruled out again overnight. Light rain at times through the late evening. Widespread rain begins after 0z Monday.

WIND: Light and variable through tomorrow afternoon.

GGW WATCHES/WARNINGS/ADVISORIES

None.

Help & About

Forecast discussions

Each National Weather Service forecast office writes an Area Forecast Discussion: the forecasters' own account of the reasoning behind the forecast. It says what the weather models show and where they disagree, how confident the forecasters are, and what could change.

Offices issue one at least twice a day, early morning and afternoon, and update it as things change. It's written in sections, usually a synopsis, the near and long term, and the outlook for pilots, mariners and fire weather, ending with any watches, warnings and advisories in effect. Forecasters write in a shorthand of their own; the NWS glossary explains most of it.

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With your AI assistant

The offices, their discussions, forecasts and alerts are also an MCP server, so an assistant like Claude can read them for you. It needs no sign-in and changes nothing. Its address is 

https://wxd.app/mcp
  • In Claude, under Settings, then Connectors, add a custom connector with that address.
  • In Claude Code, run claude mcp add --transport http forecast-discussions https://wxd.app/mcp.
  • In another client, add a server reached over streamable HTTP at that address.

Then ask, say, what the Tucson office thinks of the weekend.

An experiment by Christopher Green. Not affiliated with the National Weather Service.

The discussions are the forecast offices' own, as published by the National Weather Service.

Set in these faces, each under the SIL Open Font License 1.1:

  • Lato by Łukasz Dziedzic, for the text
  • Bricolage Grotesque by the Bricolage Grotesque Project Authors, for headings and the wordmark
  • DM Mono by the DM Mono Project Authors, for what the offices write

Icons from Heroicons and, for the weather, Phosphor Icons, both under the MIT License.