Storm Events Database

Storm Events Database

Event Details

Event Hail
Magnitude 1.00 in.
State IOWA
County/Area SAC
WFO DMX
Begin Date 05/12/2011 18:15:00 CST-6
Begin Range 4
Begin Azimuth NNW
Begin Location SCHALLER
Begin Lat/Lon 42.55/-95.34
End Date 05/12/2011 18:15:00 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 5.00K
Crop Damage 0.00K
Episode Narrative A frontal boundary stretched across the northwest part of the state during the day on the 12th. At the same time, a strong upper level low pressure was approaching from the southwest. Afternoon temperatures warmed into the upper 70s to low 80s with dewpoint readings in the 60s. The atmosphere became fairly unstable with around 2000 J/kg of CAPE available by mid afternoon. Lifted indices fell to the -6 to -12 C range. The shear was stronger than the previous day, but not all that impressive with 25 to 35 kts of effective shear. Precipitable water values were also significantly lower than the previous day, around 0.9 inches. With the approach of the upper low, freezing levels fell and were around 10,500 feet. A significant amount of CAPE was available in the -10 to -30 C layer of the atmosphere. Thunderstorms fired up along the cold frontal boundary and quickly produced hail. The convection wasn't all that strong with most of the hail in the sub-severe category from west central into north central Iowa. The largest hail was around an inch in diameter, mostly in west central and north central Iowa.
Event Narrative Pea to quarter size hail covered the ground.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 30.00K 0.00K
SCHALLER SAC CO. IA 05/12/2011 18:15 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
EARLY SAC CO. IA 05/12/2011 18:55 CST-6 Hail 1.00 in. 0 0 2.00K 0.00K
RALSTON CARROLL CO. IA 05/12/2011 19:25 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
DOW CITY CRAWFORD CO. IA 05/12/2011 19:26 CST-6 Hail 1.00 in. 0 0 2.00K 0.00K
RALSTON CARROLL CO. IA 05/12/2011 19:26 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
DOW CITY CRAWFORD CO. IA 05/12/2011 19:27 CST-6 Hail 1.00 in. 0 0 2.00K 0.00K
SCRANTON GREENE CO. IA 05/12/2011 19:35 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
DENISON MUNI ARPT CRAWFORD CO. IA 05/12/2011 19:49 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
WIGHTMAN CALHOUN CO. IA 05/12/2011 19:49 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
WIGHTMAN CALHOUN CO. IA 05/12/2011 20:06 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
ADAZA GREENE CO. IA 05/12/2011 20:18 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
DAKOTA CITY HUMBOLDT CO. IA 05/12/2011 20:31 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
CHURDAN GREENE CO. IA 05/12/2011 20:33 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
CHURDAN GREENE CO. IA 05/12/2011 20:35 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
EAGLE GROVE WRIGHT CO. IA 05/12/2011 21:09 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
CLARION WRIGHT CO. IA 05/12/2011 21:28 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
HAMPTON FRANKLIN CO. IA 05/12/2011 22:30 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
MASON CITY CERRO GORDO CO. IA 05/12/2011 22:35 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
Totals: 0 0 30.00K 0.00K