POLK

97545 · 41.700, -93.660

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The record

Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.

Event typeevent_type	Lightning
NOAA NCEI event IDncei_event_id	97,545
Episode IDepisode_id	16,900
Begin UTCbegin_utc	2008-06-26T00:40:00+00:00
End UTCend_utc	2008-06-26T00:40:00+00:00
Statestate	IOWA
County/zone typecz_type	C
County/zone namecz_name	POLK
Latitudelat	41.700
Longitudelon	-93.660
End latitudeend_lat	41.700
End longitudeend_lon	-93.660
Deaths directdeaths_direct	0
Deaths indirectdeaths_indirect	0
Injuries directinjuries_direct	0
Injuries indirectinjuries_indirect	0
Damage propertydamage_property	10.00K
Damage cropsdamage_crops	0.00K
Weather forecast office sourcewfo_source	Law Enforcement
Episode narrativeepisode_narrative	A warm frontal boundary lifted north across Iowa during the day on the 25th and was located over northern Iowa by the evening hours. The airmass became very unstable to the south of the front as surface temperatures warmed into the 85 to 90 degree range, and dewpoints rose into the low to mid 70s. This produced CAPE in the 4500 to 5000 J/kg range and a lifted index of -10 to -15 C. The atmosphere was weakly sheared with 20 to 25 kts of bulk shear. The freezing level was relatively low, around to just over 13,000 feet. A small area of thunderstorms formed over northwest and north central Iowa by the late afternoon and early evening hours. The storms became more widespread and formed into an MCS, which propagated southeast across the state and became severe. The storms produced hail, high winds, and some flash flooding. The primary mode of severe weather with this MCS was hail. Reports of hail were widespread. Much of the hail was in the three-quarter to one and one quarter inch range. There were, however, several reports of large hail. Three inch diameter hail fell northeast of Madrid in Boone County, with another report of two and one half inch diameter hail about 3 miles southwest of that. Later on, another two and one half inch hail report was received in Story County. Much of the larger hail occurred during the early stages of the event with golf ball size hail reported in Story, Dallas, and Marshall Counties as well. During the late evening hours, golf ball size hail also fell in Polk and Warren Counties as a small area of stronger storms developed within the MCS. The storms produced gusty winds in most areas as they passed, however much of the wind was below severe levels. Winds gusted to 60 to 70 MPH during the later part of the severe event in Dallas, Polk and Warren Counties as a beta bow element dropped south across these counties. Rainfall was very heavy with the storms and did cause some flash flooding. Water was reported over Highway 17 near the Des Moines River in Dallas County, caused by flash flooding. Fortunately, the weather had been relatively dry for the previous 2 weeks, so antecedent soil conditions were relatively dry. Five inches of rain fell west of Polk City in Polk County in a 2 to 3 hour time frame. There were several reports of rainfall in the 2 to 3 inch range in under three hours. Although the system was not a tornadic system, there was one report of a funnel cloud in Grundy County. Lightning struck a house in Polk County. The house was damaged by the lightning wand it was started on fire.
Event narrativeevent_narrative	A house was damaged due to a lightning strike.
Yearyear	2,008

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