Area Forecast Discussion
Issued by NWS Great Falls, MT

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904 FXUS65 KTFX 231441 AFDTFX Area Forecast Discussion National Weather Service Great Falls MT 841 AM MDT Fri Apr 23 2021 .UPDATE... Area remains under a cyclonic NW flow aloft this morning with a weak embedded shortwave disturbance moving across the area resulting in light snow or snow showers in many areas early this morning. This feature has brought a more in the way of clouds/ice crystals aloft to seed the lower levels with most precipitation this morning falling as snow. Still, plenty of low level moisture lingers through this morning for patchy fog and many roads across the area remain slick from overnight precipitation. This will improve by late this morning as light snow diminishes and moves out to the east with the shortwave disturbance. Lingering low level moisture and light easterly flow at the surface will keep clouds in place across portions of north-central and central MT into this afternoon with partial clearing expected elsewhere. A few snow showers will develop across mainly the mountain areas of central and SW MT this afternoon as the airmass destabilizes some. Hoenisch && .SYNOPSIS... Light freezing drizzle and or snow is expected to persist through the morning hours today, with gradually improving conditions this afternoon. Areas of fog are then possible tonight across most of the Northern Rockies, especially where skies clear and winds become light and variable. && .AVIATION... 545 AM MDT Fri Apr 23 2021 (23/12Z TAF period) A mix of MVFR/IFR conditions prevail under post-frontal low clouds producing areas of light snow. Light freezing drizzle has occurred overnight across portions of central Montana, including KGTF, as liquid cloud droplets are gently lifted in the sub freezing temperatures. There is moderate confidence these conditions could develop at KBZN/KEKS this morning through about 14Z. Satellite imagery and short-term models indicate the low cigs will persist through much of the morning, gradually lifting and beginning to break up by early afternoon. As cloud cover thins overnight, we`ll need to monitor for widespread fog potential early Saturday morning. Refer to weather.gov/zlc for more detailed regional aviation weather and hazard information. && .PRELIMINARY POINT TEMPS/POPS... GTF 41 27 48 32 / 60 10 60 70 CTB 39 25 42 29 / 20 10 50 60 HLN 49 31 53 35 / 40 0 70 90 BZN 49 30 55 34 / 30 0 60 70 WYS 49 23 46 28 / 30 10 70 70 DLN 52 33 54 33 / 20 0 40 40 HVR 42 25 51 34 / 20 0 30 50 LWT 37 24 49 31 / 60 20 70 80 && .TFX WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until noon MDT today Northern Rocky Mountain Front...Southern Rocky Mountain Front. && $$ http://www.weather.gov/greatfalls

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