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11HPC Eckrich

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Information about 11HPC Eckrich
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Published on October 5, 2007

Author: Jeremiah

Source: authorstream.com

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Slide1:  HOLLY, COLORADO TORNADO 28 MARCH 2007 Bill Eckrich DayWeather, Inc. Cheyenne, Wyoming Overview of Holly, Colorado:  Overview of Holly, Colorado Located in southeastern Colorado on U.S. Highway 50 in far eastern Prowers County, 28 miles east of Lamar and approximately 5 miles from the Kansas state line Population 1,048 (2000 U.S. Census) Holly Tornado Statistics:  Holly Tornado Statistics First touched down at 1957 MDT one mile south of Holly WFO PUB Tornado Warning issued at 2000 MDT Rated as high-end EF3 Moved just east of north across the entire town causing EF1 to low-end EF3 damage 2 fatalities, one within a day and another nearly a month later, with 10 injuries Path length 28 miles over a 25-30 minute period Damage width in Holly was 1000 feet wide Holly Tornado Statistics:  Holly Tornado Statistics 48 structures destroyed 100+ structures damaged Event occurred outside of both the SPC slight and moderate risk areas (12Z, 13Z, 1630Z, 20Z, 01Z) as well as the later-issued Tornado Watch #83 Colorado convection evolved from a retreating dryline possibly caused by stronger-than-forecast ageostrophic forcing from northward-propagating shortwave SPC DAY1 OUTLOOK (20Z):  SPC DAY1 OUTLOOK (20Z) TORNADO WATCH #83:  TORNADO WATCH #83 HOLLY SYNOPTIC AND MESOSCALE ENVIRONMENT:  SYNOPTIC AND MESOSCALE ENVIRONMENT INCLUDING RADAR AND SATELLITE DATA 00Z 29 March 300mb:  00Z 29 March 300mb NOSE OF JET STREAK 00Z 29 March 500mb:  00Z 29 March 500mb 00Z 29 March 700mb:  00Z 29 March 700mb 00Z 29 March 850mb:  00Z 29 March 850mb THERMAL RIDGE Slide16:  2116Z 28 March Slide17:  2316Z 28 March Slide18:  0200Z 29 March Slide19:  IR SATELLITE 0100Z 29 MARCH Slide20:  VISIBLE SATELLITE 0130Z 29 MARCH Slide21:  0153Z 29 MARCH Slide22:  0157Z 29 MARCH Slide23:  0157Z 29 MARCH Slide24:  0202Z 29 MARCH Slide25:  0202Z 29 MARCH Slide26:  HOLLY Prowers County Kiowa County Kansas EF3 Damage in Holly:  EF3 Damage in Holly WFO Pueblo EF3 Damage in Holly:  EF3 Damage in Holly WFO Pueblo High-end EF3 Damage 12N of Holly:  High-end EF3 Damage 12N of Holly WFO Pueblo High-end EF3 Damage 12N of Holly:  High-end EF3 Damage 12N of Holly WFO Pueblo Slide32:  Courtesy Ty Harmon - KLMR Slide33:  Courtesy Ty Harmon - KLMR Slide34:  Courtesy Ty Harmon - KLMR Slide35:  Courtesy Ty Harmon - KLMR CONCLUSIONS:  CONCLUSIONS Large and deep storm system over the central Rockies Large-scale ascent across eastern Colorado, southwestern Nebraska, western Kansas and the Oklahoma/Texas panhandles Surface winds ahead of the dryline backed with time as the shortwave/jet streak approached Dryline retreated SRH increased with backing winds relative to storm motion CONCLUSIONS:  CONCLUSIONS First tornado deaths in Colorado since June 27, 1960 Only the second killer tornado in Colorado since 1950 Earliest strong tornado in Colorado history Previous: 3/29/1910 in Sedgwick County Earliest killer tornado in Colorado history Previous: 4/30/1942 in Bent/Kiowa counties CONCLUSIONS:  CONCLUSIONS Prowers County has had only one prior significant tornado June 24, 1968 One injury Occurred within one mile of Holly

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