An upper level trough of low pressure (the little “U” shaped dip in the yellow jet stream line has moved Eastward with a high pressure ridge (“Arch” shape) right behind it. I expected today to be quite warm in Eugene, but the morning clouds stuck around too long and the high pressure didn’t take over quickly enough.  Heat from Eastern Oregon will be pushed our way and will heat us up rapidly Saturday and Sunday, but it won’t last very long. A week upper level trough will dip our way along with a week cool front (blue line with triangles on it moving down from Canada) followed by more high pressure all of which means we’ll stay dry. We could certainly use the moisture, but it’s just not out there for us.

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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: Clear tonight, sunny and hot Saturday, clear at night, mostly sunny and a bit cooler Sunday, partly cloudy Sunday night lows 53-59-55 highs 93-89. A mix of clouds and sun and cooler Monday and Tuesday, partly cloudy Monday night and mostly clear Tuesday night highs 84-80 lows 52-50. Mostly sunny and pleasant Wednesday through Friday, and mostly clear each night highs near 82-84 lows 52-54. (seasonal averages high 83 low 51)

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Forecast for the Umpqua Basin including, Roseburg:  Clear tonight, then sunny and warmer (hot) Saturday and mostly clear Saturday night lows near 57-61 high 95. Partly cloudy Sunday afternoon and night with a slight (20%) chance of  thunderstorms, then continued partly cloudy Monday and Monday night with a slight (20%) chance of thunderstorms highs 94-88 lows 60-55. Partly cloudy Tuesday morning and sunny in the afternoon,  mostly clear Tuesday night then mostly sunny Wednesday, partly cloudy Wednesday night and Thursday, mostly clear Thursday night and mostly sunny Friday highs 85-82-89-86 lows 58-54. (seasonal averages high 87 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly clear this evening then mostly cloudy with patchy fog late tonight and early Saturday AM at the shore, and clear inland  tonight,  partly cloudy Saturday afternoon at the shore and sunny in the AM inland then partly cloudy in the afternoon, partly cloudy Saturday night with patchy coastal fog lows 50-53 high 65. AM clouds, then partly cloudy Sunday, just a slight (20%) chance of inland afternoon and night time thunderstorms, and mostly cloudy at night high 65 low 53. Mostly cloudy Monday through Tuesday, then partly cloudy Tuesday night and Wednesday highs holding at 64 lows 50-52. Mostly cloudy Wednesday night and Thursday, then partly cloudy Thursday night and Friday low again near 50 highs 64-62. (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County:  Clear tonight, sunny and warmer Saturday, and mostly clear Saturday night  free air freezing level 16,000 ft. falling to 15,000 ft. Saturday and Saturday night lows 49-52 high 83. Mostly sunny with a (30%-40%) chance of scattered afternoon thunderstorms and a bit cooler Sunday, partly cloudy Sunday night with a (30%-40%) chance of scattered thunderstorms overnight, a mix of clouds and sun Monday with a slight (20%) chance of isolated AM showers,  then a (30%-40%) chance of isolated afternoon and evening thunderstorms,  partly cloudy Monday night free air freezing level 15,000 ft. falling to a snow level above 8,000 ft. Sunday night and Monday, and back to a free air freezing level of 15,000 ft. Monday night highs 80-83 lows near 50-46. A mix of clouds and sun Tuesday with a (30%-40%) chance of afternoon and evening thunderstorms, a mix of clouds and sun again Wednesday and Thursday with a slight (20%) chance of afternoon and evening showers, mostly clear to partly cloudy each night free air freezing level 14,000 ft. Tuesday and Tuesday night, falling to a snow level of  above 8,000 ft. Wednesday highs near 80 lows near 44. Mostly sunny Friday free air freezing level back to 14,000 ft. high 82.

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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.