Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain / Snow Melt
State IOWA
County/Area PALO ALTO
Report Source Official NWS Observations
NCDC Data Source CSV
Begin Date 2011-03-24 15:00:00.0 CST-6
Begin Location 1NE GRAETTINGER
Begin Lat/Lon 43.2413/-94.7559
End Date 2011-03-31 23:59:00.0 CST-6
End Lat/Lon 43.085/-94.7457
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 50.00K
Crop Damage 0.00K
Episode Narrative A considerable amount of snow had accumulated during the previous winter across northern Iowa and southern Minnesota. As the snow melted, river levels rose across northern Iowa with numerous sites reaching minor to moderate flood levels. A couple of the sites, most notably Estherville and Cedar Falls, briefly reached low end major levels. It was fortunate that the snow melted relatively slowly and also the fact that no significant rainfall occurred during the melt. Rainfall that occurred later in the month was held in check by sub-freezing temperatures. The fact that reduced the flooding was a cold spell that moved into the state after the 22nd. Temperatures were highly variable during the month as is typical for this time of year as the weather transitions from winter to spring. A very mild period prevailed from the 14th through the 22nd but was followed by nine consecutive colder than normal days to finish out the month. Sibley recorded the March���s lowest temperature with a low of -5�� on the 2nd while Shenandoah and Sidney tied for the highest temperatures with 81�� readings on the 22nd. Temperatures for the month as a whole averaged slightly below normal over the northwest and a little above normal over the southeast. Precipitation was fairly evenly distributed throughout the month and was generally greater than normal over the northeast one-third of Iowa and well below normal over the western third of the state. About half of the month���s precipitation came in two storms. The first storm, on the 8th-9th, started with rain statewide but transitioned to snow over the northwestern two-thirds of Iowa. Greatest snow amounts of three to five inches fell over north central and northeast Iowa while rain totals locally exceeded an inch over the southeast. The second event on the 22nd-23rd brought thunderstorms and rainfall statewide with rain amounts up to two inches over parts of north central Iowa. Damage from the river flooding was limited to agricultural areas for the most part. Considerable advance preparation in more flood prone areas also helped to reduce losses.
Event Narrative


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 375.00K 0.00K
BENSON BLACK HAWK CO. IA 03/21/2011 15:45 CST-6 Flood 0 0 75.00K 0.00K
BENSON BLACK HAWK CO. IA 03/21/2011 23:00 CST-6 Flood 0 0 100.00K 0.00K
PORTLAND CERRO GORDO CO. IA 03/22/2011 22:40 CST-6 Flood 0 0 25.00K 0.00K
PACKARD BUTLER CO. IA 03/23/2011 22:15 CST-6 Flood 0 0 50.00K 0.00K
GRAETTINGER PALO ALTO CO. IA 03/24/2011 15:00 CST-6 Flood 0 0 50.00K 0.00K
HUMBOLDT MUNI ARPT HUMBOLDT CO. IA 03/24/2011 18:15 CST-6 Flood 0 0 50.00K 0.00K
BABCOCK BREMER CO. IA 03/25/2011 07:15 CST-6 Flood 0 0 25.00K 0.00K
Totals: 0 0 375.00K 0.00K