A storm system produced a brief period of moderate to heavy snowfall that primarily impacted the foothills of Jefferson County. 4 miles northwest of Evergreen, 10 inches near Conifer and Crescent Village, with 8 to 9 inches at Genesee, 9 miles west-northwest of Golden and near Pinecliffe.
Every event with a place to put it; 5 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOU wrote it up.
A storm system produced a brief period of moderate to heavy snowfall that primarily impacted the foothills of Jefferson County. The more impressive storm totals included: 14 inches, 5.4 miles northwest of Evergreen, 10 inches near Conifer and Crescent Village, with 8 to 9 inches at Genesee, 9 miles west-northwest of Golden and near Pinecliffe. Storm totals across the rest of the Front Range mountains, foothills and South Park ranged from 3 to 6 inches.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before the first event at Apr 25, 4:38 AM MST, 22 minutes earlier.
Area Forecast Discussion National Weather Service Denver/Boulder CO 538 AM MDT Tue Apr 25 2023 .SHORT TERM...(Today and tonight) Issued at 315 AM MDT Tue Apr 25 2023 Potent storm system is still generally on track but with the slightly southward movement, qpf and overall rainfall has been reduced for sections from Denver north and east. Currently the upper low is across far northern Utah while the lead advance wave will be lifting northeast across the plains this morning. Behind the wave there is drier air through the mid levels now moving into the mountains from the west. Given this drying, our current warnings for the mountains and foothills look too early and better start time will be after 18z this morning. Expect only isolated showers this morning, except over the northeast plains where a band of showers will produce light rainfall amounts, generally a tenth of an inch or less. Also increased high temperatures a few degrees over urban corridor today given some sunshine this morning into early afternoon. As the upper circulation moves into southwest Colorado this afternoon, moisture begins to increase with increasing upslope flow. Should see full saturation of the airmass by early evening with widespread precipitation. Given some expected heating by early afternoon expect some instability with surface based CAPE values of 400-900j/kg. Could see some small hail and heavy rain with the thunderstorms and enhanced snowfall rates in the foothills with rates in excess of 2 inches per hour possible. The showery, convective elements will transform into a more steady rainfall event for the plains during the evening hours. Gradually, colder air works into the area but 700mb temperatures only cool to close to -4c by 12z Wednesday. The dynamical support is modest at best with upward ascent around -10 to -15mb/hr AT 00Z Today but then quickly the brunt of ascent shifts into southeast Colorado by 12z Wednesday. Still could see some light snowfall accumulations south and west of Denver, but generally 2 inches or less and mainly grassy surfaces due to warm pavement temperatures. Main change to forecast was to delay the winter storm warnings until after 18z this afternoon and reduce pops over much of the mountains and adjacent plains this morning given current trends. Higher pops this morning will be out over the northeast plains. .LONG TERM...(Wednesday through Monday) Issued at 338 AM MDT Tue Apr 25 2023 The forecast area should still be under the influence of the upper level low pressure area early on Wednesday. Models have the upper low moving eastward just south of the Colorado border Wednesday morning into early afternoon with upper ridging bulging in from the west by late in the day. The precipitation is expected to decreasing significantly from north to south across the CWA Wednesday, with dry conditions in place for all areas by late afternoon. Temperatures will be around 10 degrees F below seasonal normals on Wednesday. The upper ridging is short lived over the CWA Wednesday night into Thursday morning giving way to increasing northwesterly flow aloft the rest of the day. By Thursday night, a quick moving upper trough moves into the CWA. There will be decent enough moisture, synoptic scale energy and instability for a bout of mixed precipitation and thunderstorms Thursday night into Friday. There is a pretty decent cold front with this system as well. At this time, the snow expected in the mountains may warrant a highlight at some point with current data pointing to advisory amounts. The plains will see some snow later Thursday night into Friday morning, but the storm will already be winding down with only minor accumulations expected. For temperatures, Thursday highs will be around seasonal normals, with Thursday night and Friday below normals. For the weekend into next Monday upper ridging will bring a dry and warming airmass to the forecast area all three days. && .AVIATION...(For the 12Z TAFS through 12Z Wednesday morning) Issued at 532 AM MDT Tue Apr 25 2023 Band of showers have cleared the terminals early this morning with VFR conditions. Scattered showers and a few thunderstorms will develop this afternoon after 21z with MVFR ceilings developing with the showers. Widespread rain developing towards 00z with IFR conditions and northeast winds of 145-25kt. Could see a mix of snow with the rain between 03z-06z and continuing overnight. Expect APA to have the earlier turn over to snow and possibly 1-2 inches of snow by morning, mainly grassy surfaces. && .BOU WATCHES/WARNINGS/ADVISORIES... Winter Storm Warning from noon today to noon MDT Wednesday for COZ033>037. Winter Storm Warning from 6 PM this evening to noon MDT Wednesday for COZ041. && SHORT TERM...Entrekin LONG TERM....RJK AVIATION...Entrekin
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 406 AM MDT Tue Apr 25 2023 COZ030>051-261015- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 406 AM MDT Tue Apr 25 2023 ...Winter Storm to impact mountains, foothills and Palmer Divide region this afternoon through Wednesday morning. This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight A significant weather system is expected for this afternoon into Wednesday, with widespread and locally heavy precipitation anticipated. Heavy snowfall is expected for the mountains, foothills, and Palmer Divide with amounts in upwards of 2 feet for localized areas east of the Continental Divide; particularly the higher elevations of Park, Jefferson, Clear Creek and Gilpin counties. For the lower elevations, scattered rain showers and a few thunderstorms will develop this afternoon. Rain will become widespread by this evening with a possible transition to snow late tonight. The Palmer Divide will have higher potential for an early switchover to snow and impactful snow accumulations beginning early Tuesday evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Scattered precipitation will decrease Wednesday through the day. The next storm will bring more snow to the mountains Thursday night into Friday. Amounts look to be less than the current system. The plains will see a snow rain mix with little accumulation with the storm. The weekend looks dry with a moderating airmass. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight, however snowfall reports will be appreciated.
The national radar mosaic for the moment the first event began.
4 winter weather, 1 winter storm. Local standard time, as filed.
Storm totals ranged from 8 to 14 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2023Every state in 2023This day in weather historyWarnings in Colorado, April 2023
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1096526, 1096527, 1096528, 1096529, 1096530.