Storm Data and Unusual Weather Phenomena - CIG

IOWA, CentralWapello County2 W Ottumwa 30 1735CST 0.2 30 0 0 10KTornado (F1)A strong cold front front extended from central Wisconsin across central Iowa into eastern Kansas during the early afternoon hours.There was a great contrast across the front with temperatures in the upper 70s to low 80s ahead of the front, with 30s and 40sbehind the front. The air mass ahead of the front was quite unstable with surface dew point temperatures around 60 degrees. Deepmoisture was in place across the state. An upper level disturbance moved northeast along the front and set off thunderstorms in thevicinity of the cold front. The storms raced northeast at nearly 60 MPH. The main weather threat with the storms was hail withnumerous reports of three quarter to one inch diameter hail. Hail covered the ground south of Waterloo. Hail of nearly golf ball sizefell just west of Des Moines near Waukee. Though there were gusty winds associated with the storms, very few locations reportedsevere winds. There were several reports of high winds over southeast Iowa. Most of the wind reports came from Wapello,Mahaska, and Davis Counties. One report of 60 MPH winds was received in Wapello County at Eddyville. Winds of 70 MPHwere reported over eastern Davis County, where a barn was destroyed, and in Mahaska County where damage occurred in NewSharon. The line of storms did produce one tornado. The tornado touched down briefly west of Ottumwa, damaging a house there.IAZ075-083>086- Mahaska - Clarke - Lucas - Monroe - Wapello - Decatur - Wayne - Appanoose - Davis094>09730 1800CST0 0 90KFlood31 2359CSTMost of the precipitation in Iowa for the month fell in two storms. The first was mentioned above with the heavy snow event on the8th. As the snow melted, snow melt and rainfall brought rivers to near or just slightly above flood stage. Heavy rainfall on the 29thand 30th brought up to 4 inches of rain over parts of southeast Iowa, with 1 to 2 inches elsewhere. Areas that were previously dry,mainly in the upper Des Moines and Raccoon Basins, became saturated. Some minor flooding occurred over the southeast part ofthe state with some rivers rising a few feet above flood stage. The smaller South river rose nearly 8 feet above flood stage. Damagewas minor however. At months end, reservoirs in central and southern Iowa were rising with flood control capacity reduced byaround 30 percent.IOWA, East Central and SoutheastIAZ040>042-051>053- Buchanan - Delaware - Dubuque - Benton - Linn - Jones - Iowa - Keokuk - Jefferson063-076-08708091000CST1100CSTBenton County4 W Vinton 30 1409CSTDelaware CountyDelaware30 1444CSTLinn CountyPalo30 1700CSTStrong thunderstorm dumped 3 inches of rain on PaloJefferson CountyFairfield30 1816CSTDes Moines CountyYarmouth30 1958CSTClinton County.5 E Delmar 30 2028CSTIOWA, NortheastIAZ011-019-029>030Fayette CountyWadenaClayton CountySt OlafChickasaw CountyAlta Vista000000000000Heavy SnowHail (1.75)Hail (1.00)Heavy RainThunderstorm Wind (G52)Hail (0.75)0 0Funnel CloudNumerous roads and schools were closed across East Central Iowa and Northwest Illinois after heavy bands of snow deposited 4 to12 inches of snow across the region. Many vehicles were stranded along I-80 and I-380 as gusty winds whipped the snow intodrifts up to 8 feet high.Allamakee - Chickasaw - Fayette - Clayton08 0400CST2100CST0 0Winter Storm6 to 12 inches of snow was accompanied by strong north winds, restricting visibility to near zero at times and creating 3 foot drifts.2929Storm Data and Unusual Weather PhenomenaTimePath PathNumber ofEstimatedLocal/ Length WidthPersonsDamageLocation DateStandard (Miles) (Yards) Killed Injured Property Crops Character of Storm0940CST1005CST29 1338CST0 0Law enforcement officials and storm spotters reported dime size hail over parts of northeast Iowa.0000Hail (0.75)Hail (0.75)Hail (0.75)March 199863 57