An upper level trough of low pressure (the little “U” shaped dip in the yellow jet stream line is moving Eastward with a high pressure ridge (“Arch” shape) right behind it.  That means heat from Eastern Oregon will be pushed our way heating us up rapidly, but it won’t last very long. A cool front will slide in Sunday to cool us back down.

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Advisories:   NONE AT THIS TIME.

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The updated Pollen Count Forecast for the Eugene-Springfield area : Trees LOW, Grass HIGH, and weeds LOW. (as of 7/22/10) Data from Allergy and Asthma Research Group.

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Here are your detailed forecasts. **

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: AM clouds then mostly sunny and warmer today, clear tonight, sunny and hot Saturday, and mostly clear at night highs 86-93 lows 55-60. Mostly sunny and just a bit cooler Sunday, partly cloudy Sunday night high near 90 low 57. A mix of clouds and sun and cooler Monday through Wednesday and partly cloudy each night highs near 83 lows 52-54. Mostly sunny Thursday high 84.  (seasonal averages high 83 low 51)

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Forecast for the Umpqua Basin including, Roseburg:  Sunny and warmer today, clear tonight, then sunny and warmer Saturday highs 90-97 low near 54. Mostly clear Saturday night, partly cloudy with a slight (20%) chance of  thunderstorms and not as warm Sunday afternoon, then partly cloudy and cooler Sunday night with a slight (20%) chance of thunderstorms, then partly cloudy Monday through Tuesday lows 60-55 highs 92-85. Mostly clear Tuesday night, mostly sunny and warmer  Wednesday, then partly cloudy Wednesday night and warmer Thursday lows 55-58 highs 84-87. (seasonal averages high 87 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Partly cloudy this morning, sunny in the afternoon, becoming mostly cloudy with patchy fog late at the shore, and mostly clear inland  tonight  high near 64 low 50. Patchy AM fog at the shore otherwise mostly cloudy Saturday, AM sun then partly cloudy in the afternoon inland, partly cloudy Saturday night with patchy fog late at the shore high 65 low 52. Partly cloudy with patchy fog Sunday morning, mostly cloudy in the afternoon, mostly cloudy with patchy fog Sunday night and Monday, then just mostly cloudy Monday night and Tuesday highs 65-63 lows near 50. Partly cloudy Tuesday night and Wednesday, then mostly cloudy Wednesday night and Thursday low again near 50 high 64. (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County:   Sunny and warmer today and Saturday,  clear tonight and Saturday night, free air freezing level 16,000 ft. today and tonight, falling to 15,000 ft. Saturday and Saturday night highs 83-86 lows 48-52. A mix of clouds and sun with a slight (20%) chance of afternoon and evening thunderstorms and a bit cooler Sunday through Monday evening  free air freezing level 15,000 ft. rising to 16,000 ft. Sunday night through Monday night highs 80-82 lows 50-44. Mostly sunny with a slight (20%) chance of afternoon and evening showers Tuesday through Thursday, mostly clear at night snow level of  above 8,000 ft. highs near 80 lows near 44.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.