Tornado on Sep. 30, 2007 16:46 PM CDT (2024)

Data Central
Tornado Archive

Tornado Archive

The National Oceanic and Atmospheric Administration has been tracking tornadoes for decades. This interactive map, which contains data from January 1950 to February 29, 2024, pinpoints where a cyclone touched down and traces its path of destruction. For more recent tornadoes, clicking deeper provides more details, damage estimates and whether someone was injured or killed in the storm.

Summary

A very dynamic weather system moved into Iowa during the afternoon of the 30th. The system was more reminiscent of what one would expect in April or May. A close upper level low pressure, negatively tilted, lifted northeast through the central U.S. The structure was very classic in appearance with a well defined comma cloudy, dry slot, and warm conveyor in place. By the early evening, the surface low became stacked with the upper low and was located over eastern Nebraska. A defined dry line extended south-southeast out of the low. Surface temperatures warmed into the mid 70s to mid 80s ahead of the low, with dew points in the mid to upper 60s. Dew points behind the dry line dropped into the upper 30s to mid 40s. The airmass became unstable by the late afternoon with CAPE values around 1000 J/kg and lifted indices in the -2 to -4 C. range. Strong dynamics were in place with a 90 kt mid level jet in place, a low level jet of 60 to 70 kts, and an effective shear of 45 to 55 kts. The freezing level was quite high ahead of the approaching low and was between 13,000 and 14,000 feet. The high freezing level, combined with the limited CAPE of 100 to 200 J/kg in the -10 to -30 C. layer of the atmosphere, limited hail production. The downdraft CAPE was in the 600 to 1000 J/kg range, with an LCL of about 1250 meters. Thunderstorms formed in two locations. The first was along the east edge of the dry slot across Kansas. These storms became severe and lifted northeast quite rapidly into southern and central Iowa. Spotty wind damage was reported and one of the storms dropped one inch diameter hail in Marion County. The storms became tornadic as the moved into central Iowa. During the evening of Sunday 30 September 2007 two tornadoes struck portions of Marion, Jasper, Mahaska, and Poweshiek Counties. The first tornado produced EF0 to EF2 damage along its track and was rated EF2 on the Enhanced Fujita Scale with maximum winds of 125 mph. The track was 22 miles in length from 4 miles northeast of Pella to 1 mile north of Interstate 80, 2 miles west of Malcom. Much of the track was three to five tenths of a mile wide, but as wide as seven tenths of a mile at times. The second, shorter and weaker tornado was 5 miles in length and rated EF1 on the Enhanced Fujita Scale. The track began just south of Highway 6, 2.75 miles northwest of Malcom with a maximum width of 150 yards narrowing to 25-50 yards. The storm hit a farmstead just east of 110th street producing EF1 damage with speeds just under 100 mph. The tornadoes caused extensive damage on a farmstead near Malcom with three barns totally destroyed. The barns were 20 by 30 feet, 20 by 40 feet, and 60 by 100 feet. In addition, numerous other damage reports came in from along the track. Fortunately, there were no deaths or injuries from the tornadoes. Thunderstorms also formed close to the upper low center on the nose of the dry punch. There were several reports funnel clouds, along with spotty reports of high winds and hail. A storm chaser confirmed a tornado touchdown 2 NNW of Lytton in Sac county and was on the ground until 4 W of Jolley in Calhoun county. The tornado was in open country and was a small EF0 tornado. One inch diameter hail fell in Sac County, with numerous reports of pea to marble size hail.

Date/Time	F Scale	Length (in miles)	Width (in feet)	Injury*	Fataliy**	Property Damage	Crops Damage
Sep. 30, 2007 15:30 PM CDT				0 (0)	0 (0)	$3,000
Sep. 30, 2007 15:30 PM CDT	Six inch diameter tree branches were blown down by high winds.
Sep. 30, 2007 16:33 PM CDT				0 (0)	0 (0)	$3,000	$10,000
Sep. 30, 2007 16:46 PM CDT				0 (0)	0 (0)	$3,000
Sep. 30, 2007 16:46 PM CDT	Six inch diameter tree limbs were blown down west of Melcher.
Sep. 30, 2007 17:00 PM CDT				0 (0)	0 (0)	$3,000	$10,000
Sep. 30, 2007 17:26 PM CDT	EF0	1.01	30	0 (0)	0 (0)		$10,000
Sep. 30, 2007 17:26 PM CDT	Small rope tornado touched down in Sac County and moved into Calhoun County.
Sep. 30, 2007 17:26 PM CDT	EF1	0.59	530	0 (0)	0 (0)	$75,000	$100,000
Sep. 30, 2007 17:26 PM CDT	Tornado touched down in Marion County, then tracked northeast into Mahaska County.
Sep. 30, 2007 17:27 PM CDT	EF0	3.19	30	0 (0)	0 (0)		$40,000
Sep. 30, 2007 17:27 PM CDT	Small rope tornado touched moved into Calhoun County from Sac County. It lifted west of Jolley.
Sep. 30, 2007 17:27 PM CDT	EF2	3.46	1250	0 (0)	0 (0)	$500,000	$250,000
Sep. 30, 2007 17:27 PM CDT	Tornado moved into Mahaska County from Marion County, then continued northeast into Jasper County.\|
Sep. 30, 2007 17:31 PM CDT	EF2	5.79	1250	0 (0)	0 (0)	$1,000,000	$500,000
Sep. 30, 2007 17:31 PM CDT	Tornado moved into Jasper County from Mahaska County, then continued northeast into Poweshiek County.\|
Sep. 30, 2007 17:37 PM CDT	EF2	12.02	1250	0 (0)	0 (0)	$2,500,000	$1,000,000
Sep. 30, 2007 17:37 PM CDT	Tornado moved into Poweshiek County from Jasper County. It lifted west of Malcom.\|
Sep. 30, 2007 17:48 PM CDT	EF1	4.97	150	0 (0)	0 (0)	$250,000	$200,000
Sep. 30, 2007 17:48 PM CDT	The second tornado touched down northwest of Malcom. This tornado was on the ground for about 5 miles before lifting north of town.
Sep. 30, 2007 18:46 PM CDT				0 (0)	0 (0)	$2,000
Sep. 30, 2007 18:46 PM CDT	An ISU Meteorology student estimated 60 MPH wind gusts 4 miles south of Emmetsburg.

* Direct Injury (Indirect Injury)
* Direct Fatality (Indirect Fatality)

Map

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F Scale***

EF5

EF4

EF3

EF2

EF1

EF0

Not Available

*** Enhanced Fujita Scale describes the strength of the tornado based on the amount and type of damage caused by the tornado. The F-scale of damage will vary in the destruction area; therefore, the highest value of the F-scale is recorded for each event. EF0 – Light Damage (40 – 72 mph), EF1 – Moderate Damage (73 – 112 mph), EF2 – Significant damage (113 – 157 mph), EF3 – Severe Damage (158 – 206 mph), EF4 – Devastating Damage (207 – 260 mph), EF5 – Incredible Damage (261 – 318 mph)

Source: National Oceanic and Atmospheric Administration

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Tornado on Sep. 30, 2007 16:46 PM CDT (2024)

Tornado Archive

Summary

Map

F Scale***

References