textproduct: Great Falls

KEY MESSAGES

- Widespread precipitation today, with accumulating snow most prevalent over the higher terrain of southwest MT tonight into Monday morning.

- Milder and drier conditions start by Tuesday and generally prevail through the rest of the upcoming workweek.

- With lighter winds and areas of high humidity levels, pockets of fog will be possible during late overnight and morning hours, mainly impacting central and north-central MT and the southwest valleys during the upcoming work week.

..Fog during the upcoming week

The main time period of concern will be Sunday night into Monday morning as precip moves through the region and tapers off. Lighter winds, along with residual moisture, will provide favorable conditions for fog development. The main impact associated with this would be a reduction in visibility and the potential for freezing fog due to overnight lows expected to be near or below freezing. If areas of denser fog develop, there is the potential for that fog to remain socked in and keep daytime high temperatures 5-10 degrees cooler than expected. Through the rest of the upcoming work week, pockets of fog may develop overnight, although these would likely be patchy and limited to areas near bodies of water and valleys. -ESH

AVIATION

01/18Z TAF Period

Dense fog is starting to lift over North Central MT as of 18z today, as light rain moves northward into North Central MT. Low clouds/ceilings will affect all sites through the period. There is the potential that some dense fog could redevelop once again tonight. Mountains/passes will be obscured across the CWA by precip/low clouds. Brusda

PRELIMINARY POINT TEMPS/POPS

GTF 35 53 33 58 / 100 0 0 0 CTB 29 52 29 54 / 30 0 0 0 HLN 34 50 28 50 / 90 10 0 0 BZN 31 44 24 48 / 100 40 0 0 WYS 27 42 19 45 / 90 0 0 0 DLN 32 45 26 46 / 90 10 0 0 HVR 31 48 29 53 / 90 0 0 0 LWT 31 46 28 59 / 100 40 0 0

TFX WATCHES/WARNINGS/ADVISORIES

Dense Fog Advisory until noon MST today for Bears Paw Mountains and Southern Blaine-Beaverhead and Western Madison below 6000ft- Canyon Ferry Area-Cascade County below 5000ft-Eastern Glacier, Western Toole, and Central Pondera-Eastern Pondera and Eastern Teton-Eastern Toole and Liberty-Fergus County below 4500ft- Gallatin Valley-Helena Valley-Hill County-Judith Basin County and Judith Gap-Madison River Valley-Missouri Headwaters-Northern Blaine County-Northern High Plains-Southern High Plains-Western and Central Chouteau County.