A passing system produced six inches of snow near Rosita in Custer county.
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The episode as NWS PUB wrote it up.
A passing system produced six inches of snow near Rosita in Custer county.
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 Pueblo, CO wrote its last area forecast discussion before the first event at Dec 6, 10:33 PM MST, 1 hour 57 minutes earlier.
Area Forecast Discussion National Weather Service Pueblo CO 1033 PM MST Wed Dec 6 2017 .SHORT TERM...(This evening through Thursday) Issued at 255 PM MST Wed Dec 6 2017 ...Cold with Areas of Light Snow... An upper level disturbance is dropping south across Colorado this afternoon. Disturbance is pretty moisture-starved but because the air in the precipitating layer is cold enough (-12 to -13C), it is able to squeeze out a few snow showers. Webcams around the Pikes Peak Region have shown snow showers here and there, including up US24 around Cascade and also up around Cripple Creek and Pikes Peak. Cripple Creek cams were showing a bit of accumulation and there's been a dusting on top of Pikes Peak but no accumulation noted elsewhere. This disturbance will continue spreading areas of light snow southward tonight, impacting the Sawatch Range, Pikes Peak Region, Wets, Sangres and adjacent areas. Also, models show some potential over the San Luis Valley and southwest mountains. The Wets and southern Sangres probably have the best accumulation potential with 3 to 6 inches possible above 10,000 feet and 1 to 3 possible below. The top of Pikes Peak could maybe see 1 to 3. For everyplace else, generally no accumulation is expected but there could be some local light accumulations less than an inch under the right snow band. By morning, the current system should be just about all the way south of Colorado. This will bring a reprieve in the snowfall early Thursday but then a new system will approach from the north during the afternoon. Once again, this system will have just enough moisture for a few snow showers developing mainly in and near the mountains in the afternoon. Through 6 pm, those showers are only expected to get as far south at the central mountains and Pikes Peak Region. Temperatures will remain colder than average for the next 24 hours. Lows tonight and highs on Thursday will be very similar to those over the past 24 hours. A little more winter to withstand before we warm up again. .LONG TERM...(Thursday night through Wednesday) Issued at 255 PM MST Wed Dec 6 2017 Thursday night-Friday...Strong northerly flow aloft across the region Thursday night slowly diminishes from west to east through the day Friday, as embedded jet core across the Rockies continues to translate east into Upper Midwest and Northern High Plains. Latest models continue to indicate enough moisture and lift associated with the passing jet to support isolated to scattered snow showers to areas over and near the central and eastern mountains, including the Palmer Dvd and Raton Mesa, Thursday night into early Friday morning, with any accumulations expected to be very light and spotty. Latest models also remain consistent with a strong pressure gradient developing on Friday, with gusty north to northwest winds of 25 to 45 mph expected across the area through the day Friday, strongest across the far southeast plains. Warming temperatures aloft and mixing associated with the gusty winds will help temperatures warm back to around seasonal levels on Friday. The gusty winds, combined with dry conditions will bring elevated fire danger across the eastern plains, however, humidity levels are looking to stay above 15 percent, precluding any fire weather highlights. Needless to say, however, care should be taken to avoid any fire starts on Friday. Saturday-Wednesday...No big changes in the ongoing long range forecast, as Northerly flow aloft continues to weaken as Omega blocking pattern breaks down and flat upper level ridging builds into the region. Pattern suggests dry weather with temperatures warming back to above seasonal levels in the 50s to lower 60s across the lower elevations and mainly in the 30s and 40s across the higher terrain through at least the weekend. Models continue to hint of a possible backdoor front moving across the high plains brining only slightly cooler temperatures to eastern Colorado early next week. && .AVIATION...(For the 06Z TAFS through 06Z Thursday night) Issued at 1021 PM MST Wed Dec 6 2017 KCOS and KPUB are expected to have VFR conditions the next 24 hrs. Thu afternoon both locations will see gusty northerly winds with gusts between 20 and 30 kts. Thu evening there could be a few showers in the vicinity of KCOS and possibly near KPUB, however chances of this occurring are too low to include in the forecast at this time. KALS could see some showers in the vicinity through about 09z tonight, along with some gusty winds. Otherwise, VFR conditions are expected. Northerly winds are expected on Thu with wind speeds mostly under 12 kts, but the winds could increase a little in the evening hours. && .PUB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...LW LONG TERM...MW AVIATION...28
Hazardous Weather Outlook National Weather Service Pueblo CO 100 PM MST Wed Dec 6 2017 COZ058>089-093>099-072000- Western Mosquito Range/East Lake County Above 11000 Feet- Leadville Vicinity/Lake County Below 11000 Feet- Eastern Sawatch Mountains Above 11000 Feet- Western Chaffee County Between 9000 and 11000 Feet- Central Chaffee County Below 9000 Feet- Western Mosquito Range/East Chaffee County Above 9000 Feet- Saguache County West of Continental Divide Below 10000 Feet- Saguache County East of Continental Divide Below 10000 Feet- La Garita Mountains Above 10000 Feet- Upper Rio Grande Valley/Eastern San Juan Mountains Below 10000 Feet-Eastern San Juan Mountains Above 10000 Feet- Del Norte Vicinity/Northern San Luis Valley Below 8500 Feet- Alamosa Vicinity/Central San Luis Valley Below 8500 Feet- Southern San Luis Valley- Northern Sangre de Cristo Mountains Between 8500 And 11000 Feet- Northern Sangre de Cristo Mountains Above 11000 Feet- Southern Sangre de Cristo Mountains Between 7500 and 11000 Feet- Southern Sangre de Cristo Mountains Above 11000 Feet- Northwestern Fremont County Above 8500 Feet- Western/Central Fremont County Below 8500 Feet- Wet Mountain Valley Below 8500 Feet- Wet Mountains between 6300 and 10000 Feet- Wet Mountains Above 10000 Feet- Teller County/Rampart Range Above 7500 Feet/Pikes Peak Between 7500 And 11000 Feet-Pikes Peak Above 11000 Feet- Canon City Vicinity/Eastern Fremont County- Northern El Paso County/Monument Ridge/Rampart Range Below 7500 Feet- Colorado Springs Vicinity/Southern El Paso County/Rampart Range Below 7400 Feet-Pueblo Vicinity/Pueblo County Below 6300 Feet- Walsenburg Vicinity/Upper Huerfano River Basin Below 7500 Feet- Trinidad Vicinity/Western Las Animas County Below 7500 Feet- Crowley County-La Junta Vicinity/Otero County- Eastern Las Animas County-Western Kiowa County- Eastern Kiowa County-Las Animas Vicinity/Bent County- Lamar Vicinity/Prowers County-Springfield Vicinity/Baca County- 100 PM MST Wed Dec 6 2017 This hazardous weather outlook is for portions of central...east central...south central and southeast Colorado. .DAY ONE...This Afternoon and Tonight A quick moving disturbance will move south across Colorado this afternoon and tonight producing some areas of light snow for the mountains and adjacent lower elevations along and west of the Interstate 25 corridor. Snow accumulations of 2 to 3 inches with locally higher amounts are possible over the Southern Sangre de Cristo Range. Elsewhere, local accumulations from a dusting over the lower elevations up to an inch or 2 in the higher elevations will be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Light snow will be possible over the Spanish Peaks and southern Sangre De Cristo region. An inch of additional snow is possible Thursday morning. .SPOTTER INFORMATION STATEMENT... Weather conditions that meet reporting criteria for spotters will be possible this afternoon and tonight for the mountains. 50/50
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
849 PM MST WED DEC 6 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0849 PM SNOW 1 WSW ROSITA 38.09N 105.35W
12/06/2017 M4.0 INCH CUSTER CO CO-OP OBSERVER
&&The national radar mosaic for the moment the first event began.
1 winter weather. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2017Every state in 2017This day in weather historyWarnings in Colorado, December 2017
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: 730574.