Storm Events Database

Event Details

Event Hail
Magnitude 0.88 in.
State IOWA
County/Area PALO ALTO
WFO DMX
Begin Date 05/21/2011 16:43:00 CST-6
Begin Range 2
Begin Azimuth SW
Begin Location OSGOOD
Begin Lat/Lon 43.18/-94.75
End Date 05/21/2011 16:43:00 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 0.00K
Crop Damage 0.00K
Episode Narrative An upper level low was lifting northeast out of the southwest U.S. during the day on the 21st and was over the central High Plains by the evening hours. The dry slot had punched northeast across Iowa during the day on the 21st, pushing much of the deeper moisture northeast of the area by afternoon. Skies cleared, allowing the atmosphere to destabilize by evening. CAPE values rose to around 2000 J/kg by late evening. CAPE in the -10 to -30 C layer of the atmosphere was around 900 J/kg, with downdraft CAPE around 1100 J/kg. The lifted index fell to around -9 C shortly before inception. The freezing level was relatively low, around 10,500 feet. The only missing ingredient preventing the system from becoming a widespread event was the shear was limited, generally under 30 kts. Thunderstorms formed to the west and southwest of Iowa during the late afternoon hours. The storms moved northeast and broke into two areas. One hit the northwest part of the CWA by late afternoon. The mode of severe weather was in the form of hail with numerous reports of one to two inch diameter hail. Baseball size hail fell in Emmet County, east of Wallingford. The second piece of the broken line moved into southwest Iowa during the evening, producing large hail and strong winds. Numerous wind gusts of 60 to 70 MPH were reported. An outbuilding was damaged and a window blown out of a house east of Bondurant in Polk County. The hail was not as large with the southern area, generally under an inch in diameter.
Event Narrative Pea to nickel size hail.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 77.00K 14.00K
OSGOOD PALO ALTO CO. IA 05/21/2011 16:43 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
WELLINGFORD EMMET CO. IA 05/21/2011 17:03 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
WELLINGFORD EMMET CO. IA 05/21/2011 18:38 CST-6 Hail 1.75 in. 0 0 10.00K 3.00K
WELLINGFORD EMMET CO. IA 05/21/2011 18:42 CST-6 Hail 2.75 in. 0 0 5.00K 3.00K
ESTHERVILLE ARPT EMMET CO. IA 05/21/2011 18:52 CST-6 Hail 1.50 in. 0 0 3.00K 3.00K
HUNTINGTON EMMET CO. IA 05/21/2011 19:05 CST-6 Hail 1.00 in. 0 0 2.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 05/21/2011 19:36 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
(30I)LAMONI MUNI ARP DECATUR CO. IA 05/21/2011 19:53 CST-6 Thunderstorm Wind 52 kts. MG 0 0 1.00K 0.00K
SCHLESWIG CRAWFORD CO. IA 05/21/2011 20:05 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
ERICSON BOONE CO. IA 05/21/2011 20:41 CST-6 Thunderstorm Wind 50 kts. MG 0 0 1.00K 0.00K
SANTIAGO POLK CO. IA 05/21/2011 20:41 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
BETHLEHEM WAYNE CO. IA 05/21/2011 20:48 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/21/2011 21:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/21/2011 21:19 CST-6 Thunderstorm Wind 52 kts. EG 0 0 1.00K 0.00K
RUTLAND HUMBOLDT CO. IA 05/21/2011 21:31 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
Totals: 0 0 77.00K 14.00K