Navigation
- Home
- News & Blog
- Forecasts
- NWS 5 Day Forecast
- Today's Weather Story
- 48 Hour Point Forecast
- Forecast Discussion
- Mountain Area Forecast
- Avalanche Info & Forecast
- Colorado City Forecasts
- National Weather Outlook
- U.S. Cities Forecasts
- Long Range Climate Fcsts
- Advisories & Warnings
- Forecasts By Email
- Air Quality Forecast
- WeatherNation TV
- Live Conditions
- Weather Webcams
- Radar & Maps
- Lightning
- Severe Weather
- Winter Weather
- Almanac
- Thornton Weather Data
- Astronomy & Space
- National Weather Service
- Weather Extremes
- Trends & Statistics
- Climatology & Records
- Regional Temp & Precip
- River Heights
- Earthquakes - Local
- Earthquakes - Global
- Wildland Fire Activity
- Today in History
- NASA EO Imagery
- NOAA Image of the Day
- Weather Education
- Area Information
- About Us
- Weather Links
- Search Site
- Donate
Active Alerts
National Weather Service Forecast Discussion |
National Weather Service Forecast 48 Hour Graphical Forecast Today's Weather Story |
||
000 FXUS65 KBOU 051055 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 355 AM MST Fri Mar 5 2021 .SHORT TERM...(Today and tonight) Issued at 355 AM MST Fri Mar 5 2021 Clouds associated with the departing low have dropped southeast of Limon and Colorado Springs a few hours ahead of schedule. Fog has formed in most valley areas west of the Front Range. This should be shallow, but may persist through mid morning. There could be a few patches of fog further east, but the areas that had significant precipitation cleared later and have a little westerly wind so there`s probably not much fog on the plains. Today we`ll have drying/warming/subsidence aloft with light winds. Southwest flow aloft starts to develop overnight tonight, but there`s only a little moisture increase so probably not much cloud cover yet by Saturday morning. We`ll have a bit more west and southwest drainage winds in places prone to that, keeping low temperatures a little warmer in and near the foothills. We made some minor adjustments for cooler temperatures in the mountain valleys and warmer lows tonight along the base of the foothills. .LONG TERM...(Saturday through Thursday) Issued at 355 AM MST Fri Mar 5 2021 Overall quiet weather through much of the extended period with persistent ridging into early next week, then mainly mountain snow showers mid week onward ahead of an approaching Pacific low. Sharp 500 mb ridging across the region early Saturday with departing low to the east and progressive open wave shortwave trough exiting California. Ridge shifts east and is centered over CO/KS line by 18z Saturday. Will see clouds increase in the mountains Saturday morning, and with west to SW flow could see some wave type clouds spread onto the adjacent plains. Downslope flow will provide some drying further east on the plains. Surface lee trough on the plains will turn winds southerly & become gusty, with gusts over 30 mph in the far east. Fire weather concerns will be elevated on Saturday with minimum RH 15-20 percent and the gusty winds, albeit offset by last evening`s precip. Given marginal RH and recent rainfall will not raise any fire weather headlines. For max temps Saturday, bumped up a few degrees over initial blend guidance on the eastern plains. 700 mb temps warmer Saturday than Sunday, while initial guidance had Saturday cooler than Sunday. Saturday night the shortwave trough passes across Colorado with most energy remaining to the north. Limited moisture with this feature, and cloudiness Saturday night with no precip forecast. Weak ridging redevelops Sunday with continued warm temperatures through Tuesday. Meanwhile a closed low moves near the California coast, providing a moisture source that reaches the Western Slopes late Tuesday. Upslope flow and increasing lapse rates from cooling aloft with break out chance pops for snow showers Tuesday evening. California low opens up and moves slowly east Wednesday and Thursday, turning upper flow more southwesterly. 100+kt jet at 300 mb noses into Colorado Wednesday morning, with much of forecast area in favorable left exit region for ascent. Terrain plays a key role with precip, with westerly mid level flow and downslope a limiting factor on the plains. Chance pops Wednesday and Thursday mainly in the mountains, with slight chance pops relegated to the adjacent & northern plains. Cooling trend begins Wednesday with precip in the mountains, lowering heights in advance of Pacific low, and increasing cloud cover. High mountain valleys will see highs 35-40, near 40 foothills, and 50s on the plains. Canadian and to lesser extent ECMWF bring in a cold front Wednesday during the day across the plains, while GFS is a bit slower. Despite initial timing differences of front, all models show further cooling Thursday, with highs 30-35 mountains and in the 40s on the plains. && .AVIATION...(For the 12Z TAFS through 12Z Saturday morning) Issued at 355 AM MST Fri Mar 5 2021 VFR in the Denver area with light winds today, then normal S/W drainage winds tonight. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Gimmestad LONG TERM...Hanson AVIATION...Gimmestad NWS BOU Office Area Forecast Discussion
|