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. Heat from Eastern Oregon is being pushed our way and will heat us up again Sunday, but it won’t last very long. A weak upper level trough will dip our way along with a weak cold front from Canada (see blue line with triangles on it) to cool us back down, at least back to the 80s. We could certainly use some moisture, but it’s just not out there for us. There may be some thunderstorms, but they might even start fires in the forests.

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Advisories:   A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM SUNDAY FOR THE I-5 CORRIDOR FROM PORTLAND THROUGH EUGENE AND FOR THE CASCADES FOOTHILLS OF LANE COUNTY, AND THE WESTERN COLUMBIA RIVER GORGE.

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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 again Sunday, mostly clear Sunday night lows near 60 high 96. A mix of clouds and sun and cooler Monday and Tuesday with a slight (20%) chance of thunderstorms, partly cloudy Monday night and Tuesday night highs 87-82 lows 55-50. A mix of clouds and sun Wednesday, mostly clear in the evening, then mostly cloudy at night and Thursday AM,  mostly sunny in the afternoon, and partly cloudy at night highs near 80-83 lows near 53. A mix of clouds and sun again Friday and Saturday, and partly cloudy at night highs 82-84 low 52 .(seasonal averages high 83 low 51)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly clear tonight, partly cloudy Sunday afternoon and night with a slight (20%) chance of  isolated thunderstorms (possible gusty winds), then continued partly cloudy Monday and Monday night with a slight (20%) chance of scattered thunderstorms lows 60-57 highs 95-88. Partly cloudy Tuesday through Thursday highs 87-82-86 lows 60-54. Mostly clear Thursday night and Friday night, and mostly sunny Friday and Saturday lows 55 high 87-89. (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, partly cloudy tonight with patchy coastal fog low 53. AM clouds, then partly cloudy  Sunday afternoon and evening and mostly cloudy at night, AM clouds then partly cloudy with a slight (20%) chance of isolated afternoon and evening thunderstorms Monday, then mostly cloudy Monday night, a slight (20%) chance of isolated evening thunderstorms inland  highs  66-62 low 52. Patchy AM fog, mostly cloudy Tuesday and Tuesday evening, and partly cloudy Tuesday night and Wednesday highs 64 low 55. Mostly cloudy Wednesday night and Thursday, then partly cloudy and breezy Thursday night through Saturday lows near 50 highs near 63. (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County:  Clear tonight, mostly sunny Sunday with a slight (20%) chance of scattered afternoon thunderstorms, partly cloudy Sunday night with a slight (20%) chance of scattered thunderstorms, a mix of clouds and sun Monday with isolated AM thunderstorms and a (40%) chance of scattered thunderstorms in the morning and afternoon, then partly cloudy with a (40%) chance of scattered thunderstorms at night, free air freezing level 16,000 ft. falling to 15,000 ft. Sunday night and 14,000 ft. Monday night highs 84-80 lows 54-50. Partly cloudy Tuesday and Tuesday night with a (30%) chance of afternoon and evening thunderstorms, a mix of clouds and sun Wednesday and Thursday with mostly clear skies each night free air freezing level 14,000 ft. highs 78-74 lows near 48-44. Mostly sunny Friday and Saturday, and mostly clear Friday night free air freezing level holding steady at 14,000 ft. highs 76-78 low 45.

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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.