The snowstorm of April 4 to 7, 2010

The Regional Snowfall Index is NOAA’s ranking of snowstorms east of the Rockies by how much snow fell, over how wide an area and on how many people, region by region: the area and the population above four snowfall thresholds set for each region, weighted against that region’s own history. A storm is scored in each region it reached, on a scale from 1, notable, to 5, extreme.

Events

44

Deaths

3

Injuries

8

Damage

None recorded

Episodes

13

Every winter weather episode the Weather Service filed east of the Rockies in these dates. A few may belong to another system on the same days. 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.

• Winter Storm in California, April 2 to 3, 20102 eventsA winter storm brought up to two feet of snow to the highest elevations.
• Winter Storm in Utah, April 2 to 3, 20101 eventA Pacific storm system brought valley rain and mountain snow to much of northern and central Utah. The heaviest snow fell in the Wasatch Mountains north of Interstate 80.
• Heavy Snow in California, April 4 to 6, 20103 eventsA winter storm produced heavy snow throughout the higher elevations of northwestern California.
• Winter Storm in California, April 4 to 5, 20106 eventsA winter storm brought snow down into the Sierra Nevada foothills.
• Winter Storm and Avalanche in Utah, April 4 to 6, 20101 death · 62 kt wind · 13 eventsA major winter storm took a three day period to move through northern Utah, bringing heavy wet snow to the area. Though the snowfall remained primarily in northern Utah, southern Utah received strong gusty winds as this storm moved through the region.
• Winter Storm in California, April 4 to 5, 20102 eventsA winter storm brought nearly a foot of snow to the highest elevations.
• Heavy Snow in Idaho, April 5 to 6, 20102 eventsEight to 16 inches of snow fell in the Idaho Wasatch and 6 to 10 inches of snow fell in the Upper Snake River Plain. Several Idaho Falls area schools were closed on April 6th including Idaho Falls district 91, Bonneville district 93, Shelley district 60, and Ririe district 252.
• Blizzard in Alaska, April 5, 20101 eventA storm in the Gulf of Alaska produced gusty northwest wind and persistent snow showers across the Alaska Peninsula resulting in blizzard conditions in Cold Bay.
• Winter Storm in Montana, April 5 to 6, 20103 eventsA Pacific storm system brought heavy snow to portions of Southwest Montana. Snow amounts in excess of 6 inches were common.
• Heavy Snow in Nebraska, April 6 to 7, 20101 eventA slow moving storm system moved over the area on 5th and 6th. Most locations received a couple of inches, but a snowfall amount greater than six inches was reported.
• Heavy Snow and Winter Weather in Wisconsin, April 7 to 8, 20102 deaths · 8 injured · 3 eventsLow pressure that moved across Illinois into lower Michigan produced rain, and later snow, in northeast Wisconsin. The rain quickly changed to snow when the winds shifted, bringing much colder air from Canada into the the area.
• Winter Storm and Winter Weather in Michigan, April 7 to 9, 20106 eventsA low pressure system moving from the Plains into Lower Michigan produced moderate to heavy snow over portions of central Upper Michigan from late evening on the 7th through the 8th.
• Winter Weather in Michigan, April 8, 20101 eventRain developed on the 7th as low pressure approached the Great Lakes region from the southwest. As the low started to exit, cooler air filtered in from the north, and rain changed over to snow. Accumulations were very light in most places, 2 inches or less.

The snowstorm of March 30 to April 3, 2010The snowstorm of April 20 to 29, 2010Snow nowEvery winter storm filed

NOAA NCEI Regional Snowfall Index, and the Storm Events Database for the episodes.