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 rapidly today and Sunday, but it won’t last very long. A week 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. We could certainly use the 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: Sunny and hot today, clear at night, mostly sunny and hot Sunday, mostly clear Sunday night highs 95-93 lows 62-60. 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 88-82 lows 52-50. Mostly sunny and pleasant Wednesday through Friday, and mostly clear each night highs near 80-83 lows near 53. (seasonal averages high 83 low 51)
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Forecast for the Umpqua Basin including, Roseburg: Sunny and warmer (hot) today and mostly clear tonight high 95 low 61. 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 93-88 lows 63-57. Partly cloudy Tuesday through Thursday highs 85-82-89 lows 61-54. Mostly clear Thursday night and mostly sunny Friday low 55 high 85. (seasonal averages high 87 low 55)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly sunny in the this afternoon, partly cloudy tonight with patchy coastal fog high 65 low 53. A mix of clouds and sun Sunday, partly cloudy in the evening and mostly cloudy at night, a mix of clouds and sun Monday, then mostly cloudy Monday night through Tuesday night high 65 low 52. Mostly sunny Wednesday, back to mostly cloudy Wednesday night and Thursday, then partly cloudy Thursday night and Friday low again near 52 highs 64-62. (seasonal averages high 67 low 53).
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Forecast for the Cascades of Lane County: Sunny and warmer today, and clear tonight free air freezing level 15,000 ft. high 86 low 52. Mostly sunny Sunday AM, then more clouds with a (30%-40%) chance of scattered afternoon thunderstorms (mainly south of Mt. Jefferson) and a bit cooler Sunday, partly cloudy Sunday night with a (30%-40%) chance of scattered thunderstorms overnight (mainly south of Mt. Jefferson), partly cloudy Monday with a (30%) chance of scattered thunderstorms, then a (30%-40%) chance of evening and night time thunderstorms, free air freezing level 15,000 ft. highs 83-80 lows 50-45. Partly cloudy Tuesday and Tuesday night with a slight (20%) chance of afternoon and evening thunderstorms, a mix of clouds and sun Wednesday and Thursday with a slight (20%) chance of afternoon and evening showers, partly cloudy each night free air freezing level 14,000 ft. falling to a snow level of above 8,000 ft. Thursday and Thursday night highs 80-75 lows near 45. Mostly sunny Friday free air freezing level back to 14,000 ft. high 77.
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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.