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The Dexes / Funnel Cloud / 330455

Eventdex · Funnel Cloud

ROOKS

330455 · 39.370, -99.100

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The record

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

Event typeevent_typeFunnel Cloud
NOAA NCEI event IDncei_event_id330,455
Episode IDepisode_id53,192
Begin UTCbegin_utc2011-06-01T22:50:00+00:00
End UTCend_utc2011-06-01T22:50:00+00:00
StatestateKANSAS
County/zone typecz_typeC
County/zone namecz_nameROOKS
Latitudelat39.370
Longitudelon-99.100
End latitudeend_lat39.370
End longitudeend_lon-99.100
Deaths directdeaths_direct0
Deaths indirectdeaths_indirect0
Injuries directinjuries_direct0
Injuries indirectinjuries_indirect0
Damage propertydamage_property0.00K
Damage cropsdamage_crops0.00K
Weather forecast office sourcewfo_sourceLaw Enforcement
Episode narrativeepisode_narrativeLess than 48 hours after a line of damaging winds marched across North Central Kansas, a significant episode of severe weather targeted the six-county area on this Wednesday afternoon and early Thursday morning in the vicinity of a surface warm front. There were numerous reports of hail to golf ball size or larger across the area, and a few instances of damaging winds up to around 75 MPH. A brief EF0 tornado also occurred in far northern Phillips County. In addition, these storms drenched much of the area with torrential rainfall, bringing yet another round of significant flooding. Duration-wise, this was one of the most prolific severe weather events of the 2011 season, with at least one convective warning, and sometimes several, in effect at any given time for nearly 10 straight hours from around 4 PM to 2 AM CDT. A few of the more notable severe weather reports included 2-inch diameter hail in the Stockton and Natoma areas, and several power poles downed southeast of Alton. ||In terms of flooding, this was the third, and likely worst heavy rain event to strike this portion of North Central Kansas in a two-week span dating back to May 19th. Much of Smith, Jewell, Osborne and Mitchell Counties tallied 3-5 inches of rain. An observer at Ionia reported 4.59 inches from this event, bringing the total rainfall during the past nine days up to 9.57 inches. At one point in the evening, one foot of water was reported over Highway 14 in southern Mitchell County. Widespread rural flooding of creeks, streams and roads ensued as well, impacting various waterways including the Limestone, Oak and White Rock Creeks. Some evacuations were necessary northeast of Downs. Several main-stem rivers also went into flood, including the Solomon at Glen Elder and Beloit, North Fork Solomon at Portis, and South Fork Solomon at Woodston and Osborne. The gauges at Portis, Glen Elder and Beloit exceeded moderate flood stage, with Glen Elder cresting 5.76 feet over flood stage on the evening of the 2nd. ||This event essentially consisted of multiple, splitting supercell storms developing and tracking through the same areas. The first supercells initiated just west of the area around 330 PM CDT, quickly became severe, and rolled into Rooks and Phillips Counties by 430 PM. Although the initial volley of severe storms started to exit southern portions of Osborne and Mitchell Counties around 9 PM, considerable redevelopment soon took place farther west along the nose of a strong low-level jet. As a result, a whole new round of severe storms traversed the area for several more hours before finally exiting east of Jewell and Mitchell Counties by 2 AM, but not before producing gusts to 68 MPH at the Beloit airport. ||Although the mesoscale environment was supportive of severe weather, the long-lasting nature of this event was somewhat unexpected given a lack of large-scale forcing. The mid-levels featured only subtle, weak shortwave energy, well downstream from a powerful trough centered along the Pacific Northwest coast. However, deep-layer vertical wind shear around 40 knots, in combination with high mixed-layer CAPE values of 2500-4000 J/kg at the onset of the event made for a very conducive supercell environment. The primary instigator for multiple rounds of supercells was a persistent southerly low-level jet impinging over a surface warm front stretched from southwest Nebraska to east central Kansas. Winds along the nose of this jet at the 850-millibar level accelerated to 50 knots during the evening. This created very strong low-level wind shear and a mesoscale environment quite favorable for tornadoes. A review of radar data suggests that multiple storm-scale interactions, along with the outflow-dominant nature of some supercells likely spared North Central Kansas from a more significant tornado threat.
Event narrativeevent_narrativeLocal law enforcement reported a funnel cloud south of Woodston.
Yearyear2,011

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