5 inches of snow to northeast Colorado over a span of three days. West-southwesterly to northeasterly winds sustained up to 15 mph caused wind chills as low as 25 degrees below zero to occur during the early morning hours.
Every event with a place to put it; 1 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 GLD wrote it up.
Arctic air moved into the High Plains following a winter weather system that brought up to 8.5 inches of snow to northeast Colorado over a span of three days. West-southwesterly to northeasterly winds sustained up to 15 mph caused wind chills as low as 25 degrees below zero to occur during the early morning hours.
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 Goodland, KS wrote its last area forecast discussion before the first event at Jan 27, 2:15 AM MST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 215 AM MST Wed Jan 27 2021 .SHORT TERM...(Today through Friday night) Issued at 215 AM MST Wed Jan 27 2021 Today-tonight...gradual clearing from west to east is expected today as the low pressure system responsible for yesterday and last nights snow moves away from the area, replaced by an approaching upper ridge axis. Some fog is possible in spots this morning. High temperatures are expected to range from the low 20s from McCook to Gove and points east to the low and mid 30s along and west of the CO/KS border. There is some uncertainty in the high temperature forecast given the exact distribution and amount of snow that has fallen over the past few days. We'll have a better handle on snow depths and areal coverage today as we'll have lots of sunshine to see where the snow has been distributed (visible satellite) and snow depth reports from our cooperative and CoCoRaHS observers. For tonight the upper ridge axis moves over the area. Low temperatures are expected to be in the single digits above zero to the mid teens. Moisture from the surface to boundary layer is rather high, partly due to the moisture available from all of the snow on the ground. This along with fairly light winds in spots may promote fog formation for some. Per coordination with surrounding offices we'll hold off on the fog mention for now and await more data before inserting it into the forecast. Thursday-Thursday night...500mb heights rise over the area under broad upper ridging as low pressure deepens along the west coast. High clouds increase over the area through the period. High temperatures are currently expected to range from the low to mid 30s over the eastern parts of the forecast area to the mid and upper 40s across the western part. Its certainly possible to see even warmer temperatures given 850mb temperatures and those warmer readings could occur where snow cover is the lowest, mainly across the west. Low temperatures are expected to be in the low to mid teens (east) to the low to mid 20s (west). Friday-Friday night...the upper trough to our west is forecast to move east and reach the southwest Kansas area by sunrise Saturday morning. The current high temperature forecast indicates mid 30s to low 40s east and low to mid 50s along and west of the CO/KS border. We could certainly see even warmer readings given the expected 850mb temperatures, especially for areas with little if any remaining snow cover. Low temperatures are expected to be in the low to mid 20s. .LONG TERM...(Saturday through Tuesday) Issued at 215 AM MST Wed Jan 27 2021 Saturday...an open upper level wave is forecast to move east along the Kansas/Oklahoma border during the day then northeast into the central plains overnight. The associated surface low will follow the track of the upper low which will produce some northwest winds gusting in the 30 to 40 mph range during the day then decreasing some during the night. A slim chance of mixed precipitation exists across the extreme eastern portion of our area during the day on the backside of the departing open wave. Dry conditions are expected during the night. High temperatures are expected to be in the upper 30s to near 50 (warmest along the CO/KS border). Low temperatures are expected to be in the low to mid 20s. Sunday...upper level ridging moves toward the Continental Divide during the period in between lows pressure over the Mid Atlantic states and Pacific Northwest. Plenty of sunshine is expected with some increasing high clouds during the night. High temperatures are expected to be in the mid 40s to around 50 with low temperatures in the upper teens to low 20s. Monday...the Pacific Northwest upper trough moves inland with deamplifying upper ridging over the northern and central plains. Dry conditions are expected with only some increase in high cloudiness. High temperatures range from the mid 40s east to mid 50s west. Low temperatures fall into the 20 to 25 degree range. Tuesday...despite the upper trough advancing into the northern plains and intermountain west moisture in the 850-500mb column is very dry so no precipitation is expected. High temperatures are expected to be in the mid 40s to mid 50s. Low temperatures fall into the low to mid 20s. && .AVIATION...(For the 12Z TAFS through 12Z Thursday morning) Issued at 215 AM MST Wed Jan 27 2021 KGLD...sub VFR cigs are possible for a few hours this morning otherwise VFR conditions are expected through the period. Winds gradually establish a southwesterly direction late this morning with speeds up to 10kts expected. For tonight south winds of 10 to 15kts expected. KMCK...sub VFR cigs are possible for several hours this morning with VFR conditions expected through this evening. From late this evening through the overnight hours there is a very thin layer of high moisture in the boundary layer to surface which could produce some sub VFR cigs and possibly visibility limitations. Winds generally light and variable this morning then southerly up to 8kts or so this afternoon. For tonight a light south to southeast wind expected. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && SHORT TERM...99 LONG TERM...99 AVIATION...99
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</html>PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
952 PM MST TUE JAN 26 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0950 PM SNOW 9 SW SAINT FRANCIS 39.68N 101.92W
01/26/2021 E5.0 INCH CHEYENNE KS PUBLIC
TWO DAY ESTIMATED SNOWFALL TOTAL OF 4-5
INCHES SO FAR REPORTED AT LOCATION VIA
SOCIAL MEDIA. STILL SNOWING.
&&The national radar mosaic for the moment the first event began.
1 extreme cold/wind chill. Local standard time, as filed.
Northeasterly winds up to 10 mph combined with cold temperatures as cold as 11 below produced wind chills as low as 25 degrees below zero across Cheyenne County. The coldest wind chills were observed near Aroya, Colorado. Key impacts: cold.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2021Every state in 2021This day in weather historyWarnings in Colorado, January 2021
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: 938265.