Storm Events Database

Event Details

Event Blizzard
State IOWA
County/Area GRUNDY
WFO DMX
Report Source Official NWS Observations
NCDC Data Source CSV
Begin Date 2010-12-11 19:00:00.0 CST-6
End Date 2010-12-12 06:00:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 75.00K
Crop Damage 0.00K
Episode Narrative The seasons first widespread major storm struck the state on the 11th, and continued into the early morning hours of the 12th. A strong upper level system intensified over the central U.S. from the 10th into the 11th. Surface low pressure developed to the west of Iowa, and moved east into northwest Iowa by the early morning of the 11th. The low continued across the north half of Iowa on the 11th, reaching Lower Michigan by mid day on the 12th. Initially, the storm was quite moisture starved. As it intensified, the dynamics of the storm strengthened the inflow, feeding the storm system. The presentation on satellite imagery was classic by the morning of the 11th with a clear dry slot and deformation zone present. The dry slot punched into southwest and central Iowa with a line of showers and isolated thunderstorms firing up on the leading edge of the dry slot. Cold air rushed in on the back side of the storm. The deformation zone curled around the back side of the low and produced moderate to occasionally heavy snow. Temperatures plummeted as strong northwest winds swept across the state. Blizzard conditions developed as winds increased to sustained winds of 30 to 45 MPH, with gusts to near 70 MPH at times. Some of the higher gusts included a 71 MPH gust in Audubon, 65 MPH gust at Farnhamville and on the mile long bridge across Saylorville Reservoir, 64 MPH at Adair and Boone, 63 MPH at Carroll, 61 MPH at Creston, 60 MPH at Algona, and 59 MPH at Ankeny and Windsor Heights. The winds caused whiteout conditions over western Iowa by the mid afternoon hours. Boone County declared a Civil Emergency as travel became impossible in the county. Nearly all roads were closed in the northwest quarter of the state, with travel not recommended over nearly all of the Des Moines CWA. Interstate 80 was closed for several hours from the Nebraska border to just west of Des Moines. Many of the counties across the northwest half of Iowa had to remove snowplows from the highways as it was to dangerous to continue until the high winds subsided. There were scattered power outages with the storm, but numbers were on the order of a few thousand customers during the peak. There was some freezing rain at the onset of the storm, fortunately the amounts were limited to a few hundredths of an inch at most so damage was limited. Much of the state did not have snow on the ground at the beginning of the storm. This limited the amount of blowing to some extent. Measurement of the snow was difficult. Most amounts were in the 4 to 6 inch range over the northern third and western third of the state, with 1 to 4 inch amounts common elsewhere. A narrow area of far northern Iowa reported 6 to 9 inches of snow for the 24 hour period. There was a wide variance of measurements however. As an example, a total of 4.4 inches was reported at the Des Moines airport, while an observer just 6 miles to the northwest only reported 0.6 inches. Temperatures plummeted as well. Readings that were in the 30s to mid 40s F in the early morning of the 11th, fell to the single digits and teens by the night of the 11th and early morning of the 12th. Wind chill temperatures fell to -10 to -30 F across the area as well.
Event Narrative


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All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 3.300M 0.00K
EMMET (ZONE) EMMET (ZONE) IA 12/11/2010 09:00 CST-6 Blizzard 0 0 75.00K 0.00K
KOSSUTH (ZONE) KOSSUTH (ZONE) IA 12/11/2010 12:00 CST-6 Blizzard 0 0 75.00K 0.00K
AUDUBON (ZONE) AUDUBON (ZONE) IA 12/11/2010 12:00 CST-6 Blizzard 0 0 75.00K 0.00K
PALO ALTO (ZONE) PALO ALTO (ZONE) IA 12/11/2010 12:00 CST-6 Blizzard 0 0 75.00K 0.00K
CRAWFORD (ZONE) CRAWFORD (ZONE) IA 12/11/2010 12:00 CST-6 Blizzard 0 0 75.00K 0.00K
GUTHRIE (ZONE) GUTHRIE (ZONE) IA 12/11/2010 13:00 CST-6 Blizzard 0 0 75.00K 0.00K
CASS (ZONE) CASS (ZONE) IA 12/11/2010 13:00 CST-6 Blizzard 0 0 75.00K 0.00K
CERRO GORDO (ZONE) CERRO GORDO (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
HANCOCK (ZONE) HANCOCK (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
CARROLL (ZONE) CARROLL (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
ADAIR (ZONE) ADAIR (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
UNION (ZONE) UNION (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
ADAMS (ZONE) ADAMS (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
WRIGHT (ZONE) WRIGHT (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
POCAHONTAS (ZONE) POCAHONTAS (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
HUMBOLDT (ZONE) HUMBOLDT (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
SAC (ZONE) SAC (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
WINNEBAGO (ZONE) WINNEBAGO (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
WORTH (ZONE) WORTH (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
CALHOUN (ZONE) CALHOUN (ZONE) IA 12/11/2010 14:00 CST-6 Blizzard 0 0 75.00K 0.00K
TAYLOR (ZONE) TAYLOR (ZONE) IA 12/11/2010 15:00 CST-6 Blizzard 0 0 75.00K 0.00K
WEBSTER (ZONE) WEBSTER (ZONE) IA 12/11/2010 15:00 CST-6 Blizzard 0 0 75.00K 0.00K
MADISON (ZONE) MADISON (ZONE) IA 12/11/2010 15:00 CST-6 Blizzard 0 0 75.00K 0.00K
GREENE (ZONE) GREENE (ZONE) IA 12/11/2010 15:00 CST-6 Blizzard 0 0 75.00K 0.00K
FRANKLIN (ZONE) FRANKLIN (ZONE) IA 12/11/2010 15:00 CST-6 Blizzard 0 0 75.00K 0.00K
RINGGOLD (ZONE) RINGGOLD (ZONE) IA 12/11/2010 16:00 CST-6 Blizzard 0 0 75.00K 0.00K
HAMILTON (ZONE) HAMILTON (ZONE) IA 12/11/2010 16:00 CST-6 Blizzard 0 0 75.00K 0.00K
DALLAS (ZONE) DALLAS (ZONE) IA 12/11/2010 16:00 CST-6 Blizzard 0 0 75.00K 0.00K
BOONE (ZONE) BOONE (ZONE) IA 12/11/2010 17:00 CST-6 Blizzard 0 0 75.00K 0.00K
HARDIN (ZONE) HARDIN (ZONE) IA 12/11/2010 17:00 CST-6 Blizzard 0 0 75.00K 0.00K
WARREN (ZONE) WARREN (ZONE) IA 12/11/2010 18:00 CST-6 Blizzard 0 0 75.00K 0.00K
BUTLER (ZONE) BUTLER (ZONE) IA 12/11/2010 18:00 CST-6 Blizzard 0 0 75.00K 0.00K
POLK (ZONE) POLK (ZONE) IA 12/11/2010 18:00 CST-6 Blizzard 0 0 150.00K 0.00K
STORY (ZONE) STORY (ZONE) IA 12/11/2010 18:00 CST-6 Blizzard 0 0 75.00K 0.00K
BREMER (ZONE) BREMER (ZONE) IA 12/11/2010 18:00 CST-6 Blizzard 0 0 75.00K 0.00K
JASPER (ZONE) JASPER (ZONE) IA 12/11/2010 19:00 CST-6 Blizzard 0 0 75.00K 0.00K
GRUNDY (ZONE) GRUNDY (ZONE) IA 12/11/2010 19:00 CST-6 Blizzard 0 0 75.00K 0.00K
MARION (ZONE) MARION (ZONE) IA 12/11/2010 19:00 CST-6 Blizzard 0 0 75.00K 0.00K
MARSHALL (ZONE) MARSHALL (ZONE) IA 12/11/2010 19:00 CST-6 Blizzard 0 0 75.00K 0.00K
TAMA (ZONE) TAMA (ZONE) IA 12/11/2010 20:00 CST-6 Blizzard 0 0 75.00K 0.00K
BLACK HAWK (ZONE) BLACK HAWK (ZONE) IA 12/11/2010 20:00 CST-6 Blizzard 0 0 75.00K 0.00K
POWESHIEK (ZONE) POWESHIEK (ZONE) IA 12/11/2010 21:00 CST-6 Blizzard 0 0 75.00K 0.00K
MAHASKA (ZONE) MAHASKA (ZONE) IA 12/11/2010 22:00 CST-6 Blizzard 0 0 75.00K 0.00K
Totals: 0 0 3.300M 0.00K