June1- 15, 2007
June 1- 15,
June16- 30, 2007
June16- 30, 2008
July 1- 15,
July 1- 15,
Yakima Airport White Pass East Green Lake Average
Historic weather records show wide variations in June temperatures. About once every 4-5 years, June temperatures remain warm enough for Mardon flight activity in early June. Once every 3-4 years, temperatures during the first 2 weeks of June remain cold enough to preclude any significant Mardon flight. The more normal pattern is a few days of hot weather, followed by cooling in early June. The periods of warmer weather typically get longer as June progresses. Based on weather records and observations, surveys should probably be planned to start about June 12-15 at the lower elevations. However, it is possible for warm weather to arrive June 1st and stay for 2 weeks. The observation of Mardon’s starting to fly at 4000 feet on June 2, 2007, after just a few days of hot weather, indicates that an early flight period is possible, especially at lower elevations. At elevations above 4500 feet, it maybe normal to have a brief early flight in mid-late June, then a larger Mardon hatch in July.
: Average Maximum Temperatures (Degrees F) 2007 and 2008
o Although numerous areas were surveyed north and east of the known range, there were no new Mardon skipper sites discovered outside the range established during 2007 survey season. The site documented north of Rimrock Lake in 2007 was later determined to be
an aberrant Sonora skipper (
). In 2008, the areas searched outside the
known range included Spencer Cr, Sleepy Park, Wildcat, Tieton Basin, Timber Wolf Mtn, Three Cr, L. Rattlesnake, Milk Cr, Pleasant Valley and Little Naches (Appendix, Table A). The timing of these area searches coincided with the Mardon skipper flight periods at comparable elevations on the NRD. Survey timing and intensity should have documented Mardons if they were present. The present northern range of the Mardon skipper is FS RD 1200, south of Rimrock Lake. Appendix, Table A is a list of effort during protocol survey conditions. Other sites/dates were surveyed when temperatures and/or winds were outside of protocol conditions. These sites were not listed in Appendix A. All surveys focused mainly on sites visible from road systems.
o An additional 18 new Mardon skipper sites were documented on the NRD. This includes the 5 new sites documented by Xerces staff (Jepsen et al. 2008). All new occurrences were found either in the Rimrock, South Fork Tieton, or Pinegrass Ridge areas. Again