A very strong frontal boundary was in place across Iowa during the afternoon of the 9th.  Temperatures were in the mid 20s over the far northwest corner of the state, with low 80s in the southeast.  Dewpoints reached the mid 50s to low 60s over the southeast as well.  Moisture continued to stream into the state on a 30 to 40 MPH low level jet.  Precipitable water values increased to between 1 and 1.3 inches.  CAPE was around 1000 J/kg across the area with an effective shear of 45 to 55 kts.  There was little DCAPE available, however the CAPE in the -10 to -30 C layer of the atmosphere was around 300 J/kg.   Thunderstorms formed deep in the cold air from west central through north central into parts of northeast Iowa.  The storms produced hail, sufficient to cover the ground in many instances, and scattered high wind events.  Nearly all of the storms produced at least small hail with the stronger storms producing severe to significant hail.  The largest hail reported was in Crawford County, where 2 inch diameter hail fell south of Charter Oak.  Storms produced high winds in the northwest, with damage reported in Pocahontas and Kossuth Counties.  A shed was blown over by thunderstorm winds in Pocahontas County at Laurens.  Power lines were blown down in Kossuth County at Fenton, while a barn and outbuilding was toppled east of Whittemore.

Heavy Rain in WAYNE, IOWA
From 10-APR-13 07:10:00 to 10-APR-13 07:10:00 (CST-6)
Location: CORYDON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Overnight total 2.50 inches.

Thunderstorm Wind in POCAHONTAS, IOWA
From 09-APR-13 18:14:00 to 09-APR-13 18:14:00 (CST-6)
Location: LAURENS
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A shed was blown over.

Thunderstorm Wind in POCAHONTAS, IOWA
From 09-APR-13 18:15:00 to 09-APR-13 18:15:00 (CST-6)
Location: LAURENS
Magnitude: 57.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An athletic equipment shed and baseball field dugout at the Laurens-Marathon school was destroyed.  At least four trees had multiple branches down.

Thunderstorm Wind in KOSSUTH, IOWA
From 09-APR-13 18:59:00 to 09-APR-13 18:59:00 (CST-6)
Location: WHITTEMORE
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A barn and outbuilding destroyed.

Heavy Rain in GREENE, IOWA
From 10-APR-13 11:00:00 to 10-APR-13 11:00:00 (CST-6)
Location: CHURDAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Approximately 5 inches of rain from the storm, 2 inches in the last 24 hours.

Heavy Rain in HAMILTON, IOWA
From 10-APR-13 09:00:00 to 10-APR-13 09:00:00 (CST-6)
Location: WEBSTER CITY ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm total rainfall 3.40 inches, 24 hour total 1.4 inches.  Some minor ponding in fields and streams approaching bankfull.

Hail in CALHOUN, IOWA
From 09-APR-13 16:10:00 to 09-APR-13 16:13:00 (CST-6)
Location: MANSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail covered the ground.

Thunderstorm Wind in KOSSUTH, IOWA
From 09-APR-13 18:45:00 to 09-APR-13 18:45:00 (CST-6)
Location: FENTON
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

Power line taken down.

Hail in HUMBOLDT, IOWA
From 09-APR-13 16:42:00 to 09-APR-13 16:42:00 (CST-6)
Location: UNIQUE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail covered the ground.

Hail in WEBSTER, IOWA
From 09-APR-13 16:19:00 to 09-APR-13 16:19:00 (CST-6)
Location: CLARE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ground was covered.

Hail in HUMBOLDT, IOWA
From 09-APR-13 16:46:00 to 09-APR-13 16:46:00 (CST-6)
Location: HUMBOLDT MUNI ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CERRO GORDO, IOWA
From 09-APR-13 18:02:00 to 09-APR-13 18:02:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail covered the ground.

Hail in KOSSUTH, IOWA
From 09-APR-13 19:02:00 to 09-APR-13 19:02:00 (CST-6)
Location: BANCROFT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in CRAWFORD, IOWA
From 09-APR-13 20:20:00 to 09-APR-13 20:20:00 (CST-6)
Location: CHARTER OAK
Magnitude: 2.00 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in WEBSTER, IOWA
From 09-APR-13 18:42:00 to 09-APR-13 18:42:00 (CST-6)
Location: FT DODGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall total 2.14 inches.

Heavy Rain in POLK, IOWA
From 10-APR-13 07:00:00 to 10-APR-13 07:00:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall for 48 hours 2.75 inches, 24 hour 0.92 inches.

Heavy Rain in WRIGHT, IOWA
From 10-APR-13 12:00:00 to 10-APR-13 12:00:00 (CST-6)
Location: GOLDFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall total of 4 inches.

Hail in HUMBOLDT, IOWA
From 09-APR-13 16:47:00 to 09-APR-13 16:47:00 (CST-6)
Location: DAKOTA CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter