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r-~ , ~) .~~,~_-.;)...., ,f'> .~~, ..n .' '~~4;~~-j~el'. ) REC!f\!~if AUG 29 '90 NEWSLETTER 90 - 17 COL(~)O ~"'f'. rf., CONSERVA TIOhl RQA?? FOR THE PERIOD AUGUST 18 - AUGUST 24. 1990 GENERAL INTEREST: The end date of ttle 1990 seM30n has been moved up to September 1st from th~ originally scheduled September 15th date. The r'eason is primarily financial. The cloud top aircraft has to undergo ~ replacement of its de-icing equipment on the leading edge of its wings...a fairly expensive operation requiring costly materials emd intensive, highly-skilled ~lOrkmanship tllat nOt'~1 aircraft maintenance men are incapable of performing. OPERATtONS: This was the most active week of the season with six operational days out of ~even. High humidity, surface troughing. occasional upper air troughing and intense surface heating were the pri~e causes of storm development during the week. AUGUst 18th-- '-OPERAT lONAL DAY #42: All planes wOl-e scrambled al"ound 2:15 p.m., MDT, as numerous small storms began forming rapidly in eastern Hamilton/western Koal-ny counties. StOl-ms eventually organized into a N-S line near the Kearny/Hamilton County line, north of Kendall; seeding to increase rainfall began at 2:35 p.m. All seeding was concentrated there as general intensification ooo"r1"ed requJ.rlng hail suppression seeding. A Second line of storms began building ~rom near Lakin, NE toward Scott City and seeding tl-ansitioned to thb.t line as the :first line, of cells ro<Tged with it. Three planes continued wOl;kine; the 11ne of storms acroSs Pinney, Wichita, Scott and Lane counties as it moved NE. However, by 4:40 p.m. a third line of storms had formed NE-SY across the aE half of Greeley County with one plane seeding from 'there ;tntu western Wich:lta County until 5: 3B p.'In. Then, the plane went to SW Kearny County and seeded fOr a few minutes before going to eastern Pinney and Gray co~nties to assist along the second line of storms that had moved into Pinney, Lane i:l.nd Gray counties. By 'that time two of the ai rcraft had, rUn out of seedi ng agent and a third was cr'U,icl.\lly low---eventually runn~ng out at 6: 40 p. ro' As the storms moved further' NE, seeding was: restricted to Gray and Ford COunties. The cloud top plane and a cloud base plane wet'e abl", to set airbol'ne a second time from Dodge City and repla,ced the remaining seed1118 aircraft. Only brief seeding was then required over NY! Fox'd County before 1 t moved into Hodge,man County. AUGUST 20th---OPERATIONAL DAY #43: Severe thunderstorms built rapidly by mid-afternoon in eastern Ford County. All planes were e;'''x""mbled to tha l aI-e" around 2: 4 0 p, m., hDwev';'r, the storms wi th hail-'bea,-ing rad~'r' inLelloit.ie5 had moved east out ot Ford County by the time ,the seeding aircraft arrived. There was some lingering ,weak storm dElveJ.CJpment over NE and E. Ford County that w",s seeded starting at 3:20 p.m. Seeding ended around the scattered storms at 5:03 p.m. with all planes landing at Dodge City to await further stol-m development.