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<br />-. " <br />DI ~ <br />:sc I I <br />.., .'.. <br />AfiJC <br /> --- <br />F , <br />I j <br />l <br />Iif. <br /> <br />rJ 'II <br />I:;" <br /> <br />~ <br /> <br /> <br />WEEKLY NEWSLETTER <br />94.-6 <br />POR THE PERIOD JUNE 5 - 11, 1994. <br /> <br />Gene_ra;l,.. Int.ere.EJ:t::. For the month of May there were 84.0 hours Q <br />cloUd base seeding time during operational flights with 17; 878 <br />grams of silver iodide generated. The cloud top aircraft seeded <br />for 18,276 seconds or 305 minutes of seedi.ng while penetrating <br />growing clouds. There were 690.8 ki.lograms (1522 Ibs. of dry ice <br />dispensed). Also, thet'e were 12 seeding days for the month---a <br />normal number for the month of May. <br /> <br />OPERATIONS: Dur.ing the week moisture was both high and persistent <br />at the surface and in the lower lavElls. This moist condition <br />t:'ombined with highly unst;able air f upslope convergence along a dry <br />line and the occasional upper troughing to produce a very active <br />severe storm week and active seeding operat.ions. crop-damaging hail <br />was widespread from ~torms this week. Typically ,storms would form <br />in Eastern Colorado or Northwest Kansas by late afternoon and move <br />into the target area, frequently near or after midnight and ending <br />a few hours later, near dawn. June 5th was a day in which only <br />observation flights were performed. <br /> <br />June 6th/7th - OPEB!\T~OJ:j"AL_p_ay.~._/t],;L!...JUJ:;__~ At 6:05 p.m. all planee <br />were scrambled for seeding duties along a N-S line of storms moving <br />NE toward Greel~y and Wallace countJas. A tornado was reported near <br />Towner, CO. The primary storm within the line soon turned more <br />easterly near Towner and moved ESE through Greeley County. Seeding <br />was performed on the system from 7:07 p.m. until 10:19 p.m. Planes <br />began either running low of fuel or\out of seeding agent from 9145 <br />p.m. onward until 10:19 p.m. Fortunately, the storm was becoming <br />weaker as the last plane left it at 10:19 p.m. and collapsed in <br />southwestern Wichi.ta County. However, by 11 p.m. a new severe storm <br />had forxned near the Wichita/Scott county Itne northeast of Leot1- <br />The cloud base aircraft werE scrambled with the plane based nearest <br />the storm developing steering problems on take-off and unable to <br />launch. The stor.m moved across northern Scott County into north~ <br />western Lane, however, upon aircr.aft <lrrival, only weak updrafta <br />were found and seeding performed from 12:09 ~12:12 a.m. Updrafts <br />soon dimi nished and the system continued northeast out ot the <br />target area; all flights were term:l.nated by 12:05 a.m. 'l'otal <br />flight time for the day was 24.0 hours <br /> <br />June gth_:'_nQ~1;;WI-';g;J;9~Al:. QA'Lli11.: All planes were scrambled at 11145 <br />p.m. June 8th as an arc-shaped, E-W oriented line of storms moved <br />southerly towar.d the target area fr.om Northwest Kansas; individual <br />storms in the line were moving SE to SSE. Seeding began at cloud <br />baae at 12:23 a.m.; north of Leoti; all other base seeding aircraft <br />joined within 20 minutes and the cloud top by 12:59. Seeding was <br />performed aC~9ss Greeley, Wichita, scott, Lane, Hamilton, Kearny <br />and Finney counties as the line moved southerly. Seeding waB dona <br />until the aircraft were p.ach out of seeding agent or low on fuel--- <br />tha last one ended at 3:58 a.m. Low ceilings and visibilities as <br />well as weaker storxns precluded sending aircraft up to Beed again. <br />