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Storm Events Database
Event Details
| Event | Heavy Snow |
| State | IOWA |
| County/Area | GRUNDY |
| WFO | DMX |
| Begin Date | 12/08/2009 02:00:00 CST-6 |
| End Date | 12/09/2009 06:00:00 CST-6 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 10.00K |
| Crop Damage | 0.00K |
| Episode Narrative | An intense low pressure system moved into southern California during the afternoon and evening of the 7th, then tracked northeast across the central U.S. the surface low reached Kansas during the morning of the 8th, eastern Kansas by evening, and tracked to northern Illinois before sunrise on the 8th. The storm intensified rapidly, reaching 975 mb by the afternoon of the 9th as it crossed Lower Michigan. Snow broke out across Iowa during the overnight hours of the 7th into the early morning hours of the 8th. The snow continued through the day on the 8th. Northeast winds of 15 to 25 MPH caused drifting snow through the day and into the evening. Snowfall reached an inch per hour at times during several heavier waves of snowfall during the afternoon and evening of the 8th. A broad band of 8 to 16 inch snowfall totals were reported across much of the northwest two thirds of the state. There were isolated reports of thundersnow over southwest into central Iowa. Some of the heavier snowfall totals included 20 inches in Sac County at Schaller, 16.2 inches in Adams County at Corning, 16 inches in Cass County at Atlantic, 15.7 inches at the Des Moines Airport, and 15.3 inches in Windsor Heights, both in Polk County. The entire CWA received at least 4-6 inches from the storm over a 36 hour period. In terms of snowfall across the state, this storm produced the greatest snowfall /10.2 inches average/ of any storm since 1971. The snow became mixed with freezing rain and ice pellets over the southeast third of the state, and even turned to all freezing rain for a few hours southeast of a Lamoni to Ottumwa line. Ice accrual was generally under one tenth of an inch. Road conditions became hazardous with most businesses and schools closing by the early to mid afternoon hours of the 8th due to the poor conditions. |
| Event Narrative |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 430.00K | 0.00K | |||||||
| DALLAS (ZONE) | DALLAS (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| POLK (ZONE) | POLK (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| UNION (ZONE) | UNION (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WAYNE (ZONE) | WAYNE (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CLARKE (ZONE) | CLARKE (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| ADAMS (ZONE) | ADAMS (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| DECATUR (ZONE) | DECATUR (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| GUTHRIE (ZONE) | GUTHRIE (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| MARION (ZONE) | MARION (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WARREN (ZONE) | WARREN (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| AUDUBON (ZONE) | AUDUBON (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| LUCAS (ZONE) | LUCAS (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| MADISON (ZONE) | MADISON (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| ADAIR (ZONE) | ADAIR (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| TAYLOR (ZONE) | TAYLOR (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| RINGGOLD (ZONE) | RINGGOLD (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CASS (ZONE) | CASS (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| JASPER (ZONE) | JASPER (ZONE) | IA | 12/07/2009 | 23:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CARROLL (ZONE) | CARROLL (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| TAMA (ZONE) | TAMA (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| BUTLER (ZONE) | BUTLER (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| STORY (ZONE) | STORY (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WRIGHT (ZONE) | WRIGHT (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| GRUNDY (ZONE) | GRUNDY (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| BREMER (ZONE) | BREMER (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| BLACK HAWK (ZONE) | BLACK HAWK (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| FRANKLIN (ZONE) | FRANKLIN (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| HAMILTON (ZONE) | HAMILTON (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| MARSHALL (ZONE) | MARSHALL (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| HARDIN (ZONE) | HARDIN (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| POWESHIEK (ZONE) | POWESHIEK (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 0.00K | 0.00K | |
| GREENE (ZONE) | GREENE (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| SAC (ZONE) | SAC (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CALHOUN (ZONE) | CALHOUN (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CRAWFORD (ZONE) | CRAWFORD (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| KOSSUTH (ZONE) | KOSSUTH (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| HUMBOLDT (ZONE) | HUMBOLDT (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WEBSTER (ZONE) | WEBSTER (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| POCAHONTAS (ZONE) | POCAHONTAS (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| BOONE (ZONE) | BOONE (ZONE) | IA | 12/08/2009 | 02:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WORTH (ZONE) | WORTH (ZONE) | IA | 12/08/2009 | 04:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| HANCOCK (ZONE) | HANCOCK (ZONE) | IA | 12/08/2009 | 04:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| WINNEBAGO (ZONE) | WINNEBAGO (ZONE) | IA | 12/08/2009 | 04:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| CERRO GORDO (ZONE) | CERRO GORDO (ZONE) | IA | 12/08/2009 | 04:00 | CST-6 | Heavy Snow | 0 | 0 | 10.00K | 0.00K | |
| Totals: | 0 | 0 | 430.00K | 0.00K |
