POWESHIEK

234432 · 41.734, -92.777

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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	234,432
Episode IDepisode_id	39,134
Begin UTCbegin_utc	2010-06-26T09:30:00+00:00
End UTCend_utc	2010-06-26T09:30:00+00:00
Statestate	IOWA
County/zone typecz_type	C
County/zone namecz_name	POWESHIEK
Latitudelat	41.734
Longitudelon	-92.777
End latitudeend_lat	41.734
End longitudeend_lon	-92.777
Deaths directdeaths_direct	0
Deaths indirectdeaths_indirect	0
Injuries directinjuries_direct	0
Injuries indirectinjuries_indirect	0
Damage propertydamage_property	550.00K
Damage cropsdamage_crops	0.00K
Weather forecast office sourcewfo_source	Newspaper
Episode narrativeepisode_narrative	A very unstable airmass was in place over western Iowa and areas to the west. CAPE rose to over 6500 J/kg by late afternoon with the lifted indices falling to -12 to -15 C. Downdraft CAPE as quite high at around 1600 J/kg, while available CAPE in the -10 to -30 C layer of the atmosphere was between 700 and 1000 J/kg. The atmosphere had a strong shear present with 40 to 60 kts The freezing level was quite high, just below 15,000 feet. Precipitable water increased to around 1.5 inches. Strong thunderstorms developed over southern Minnesota. Initially, the thunderstorms moved east. Once they became more rooted in the boundary layer, they moved southeast and propagated nearly due south. The main severe threat was high winds, with numerous reports of tree, power line, and grain bin damage. Winds of 70 MPH were measured in Estherville for example. Seventy MPH winds were reported in Grundy County. The outflow boundary from the complex continued to move southeast, and actually moved all the way into Missouri. Scattered severe weather occurred with this. Seven power poles were snapped in Polk County by the high winds. A wind gust of 62 MPH occurred at the Ottumwa Airport. Flash flooding also became a problem with the antecedent soil conditions nearly saturated. Flash flooding in Emmet County resulted in the closing of Highway 4 near Wallingford and evacuations in the city. A secondary area of thunderstorms formed over northwest Iowa and moved east-southeast into the CWA. Heavy rains caused minor urban flooding in Calhoun County with 6 inches of standing water reported in the city of Pomeroy. Although many of the storms produced small hail, there were very few reports of hail larger than dime size. Reports of hail up to an inch in diameter were received in central Iowa late in the evolution of the system. Lightning struck a house east of Grinnell during the early morning hours around 0330 CST. The house was set on fire with structural damage and damage to contents estimated at $550,000.
Yearyear	2,010

Provenance

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