December 20 Snow Forecast vs Actual

Each time I am working and have to forecast snow I take the last snow forecast before the first snowflakes fly and compare it to what actually falls. Here is how this storm panned out. The top image is the forecast the bottom image I took the map and put on the snow totals so it is easier to compare.


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Posted under Verification

This post was written by Schnack on December 20, 2012

24 Hour Snow Reports

24 Hour snow reports
6 AM Wednesday to 6 AM Thursday

These are not totals because it was still snowing at 6 AM.

Location County Snow
Waterloo Black Hawk 9.7
Dubuque Dubuque 9.1
Cedar Rapids Linn 5.0
Iowa City Johnson 3.0
Anamosa 3SSW, IA Jones 4.7
BELLE PLAINE, IA Benton 5.0
CASCADE, IA Dubuque 6.8
Cedar Falls 1.4 SSE Black Hawk 10.0
Cedar Rapids 2.0 ENE Linn 4.2
Cedar Rapids 3.4 NW Linn 4.3
Central City 6.7 W Linn 6.0
CHARLES CITY, IA Floyd 3.5
CLERMONT, IA Fayette 6.4
CLUTIER, IA Tama 8.0
COGGON, IA Linn 7.0
CRESCO 1NE, IA Howard 3.3
Decorah 7.9 ENE Winneshiek 5.0
Dubuque #3, IA Dubuque 2.5
Dubuque L&D 11, IA Dubuque 5.0
ELKADER 6SSW, IA Clayton 10.4
ELMA, IA Howard 3.7
FAYETTE, IA Fayette 8.0
FULTON, IA Jackson 4.0
GRUNDY CENTER, IA Grundy 10.0
GUTTENBERG L & D 10, IA Clayton 8.0
HAMPTON, IA Franklin 4.0
IONIA 2W, IA Chickasaw 4.0
IOWA FALLS, IA Hardin 4.0
LANSING 4SE, IA Allamakee 4.8
Latimer 1.9 NE Franklin 6.5
LOWDEN, IA Cedar 1.1
MAQUOKETA 4 W, IA Jackson 3.0
MARENGO, IA Iowa 3.0
Marion 1.2 NE Linn 3.9
Monona WWTP, IA Clayton 8.0
Monticello, IA Jones 4.6
NASHUA 2SW, IA Floyd 3.0
New Hampton 0.4 SW Chickasaw 4.5
NORTH ENGLISH, IA Iowa 1.0
North Liberty 1.0 ENE Johnson 2.1
Oelwein 0.8 WNW Fayette 9.5
OSAGE , IA Mitchell 5.2
Peosta 0.7 ESE Dubuque
POSTVILLE, IA Allamakee 6.0
Quasqueton 1.8 S Buchanan 6.8
Solon 0.3 ESE Johnson 2.0
ST ANSGAR, IA Mitchell 5.2
STANLEY 4 W, IA Buchanan 11.2
SWISHER, IA Johnson 3.0
TOLEDO 3 N, IA Tama 8.0
VINTON, IA Benton 6.1
VOLGA 1NE, IA Clayton 11.3
Waterloo 1.8 SSE Black Hawk 9.2
Waterloo NWS Snowfall, IA Black Hawk 4.2
Waucoma 3.2 S Fayette 2.0
WAUKON, IA Allamakee 7.0
WILLIAMSBURG 3 SE, IA Iowa 1.8
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Posted under Precipitation Totals, Winter Weather

This post was written by Schnack on December 20, 2012

December 20

From NWS
2008
: An area of low pressure produced strong winds and snow across much of Iowa on December 20-21. While snowfall accumulations were generally light, an inch or two at most locations, there was already a snow pack of 6 to 12 inches in most areas and winds increasing to 25-35 mph with gusts to 40-50 mph whipped the snow up to create blizzard conditions especially across northern portions of the state. Many roads quickly drifted shut, snow plows were called off, and some highways were closed north of Highway 30 with law enforcement officials reporting visibility reduced to below 100 feet in open areas. In addition to blowing and drifting snow the strong winds combined with subzero temperatures to produce dangerous wind chills in the -30 to -40 F range.

 This Day in National/World Weather History …
 20 December 1986 → An “Alberta Clipper” intensified explosively south of New England bringing high winds, torrential rains, and heavy snows to the region. Up to 4 inches of rain fell in southern areas and winds gusted frequently to 70 mph. 30 inches of snow fell in southern Vermont, 24 inches on the higher elevations of western Massachusetts, and 20 inches in New Hampshire.
 20 December 1990 → Snow fell at Santa Maria, CA for the first time since records were kept.
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Posted under Weather History

This post was written by Schnack on December 20, 2012