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A high pressure ridge (Shaded “Arch” shape in blue arrows) will be getting stronger and moving right over us. The high will trap the hot air over the Pacific Northwest producing the hottest temperatures so far this year. There will be a slight chance of thunderstorms at the peak of the heating Friday through Sunday evening. A very hot start for the USA Track and Field Championships that start today continuing through Saturday. Could even see a thunderstorm Friday and Saturday. The grass pollen could be a serious problem for the athletes who are allergic.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 29 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

A FIRE WEATHER WATCH IS IN EFFECT FROM FRIDAY MORNING UNTIL SUNDAY MORNING FOR HOT, DRY, UNSTABLE CONDITIONS , UNSEASONABLY DRY FUELS, AND THE THREAT OF MAINLY DRY THUNDERSTORMS FOR THE AREA THAT INCLUDES THE WILLAMETTE VALLEY AND ADJACENT COAST RANGE AND FOOTHILLS, THE MOUNT HOOD NATIONAL FOREST WEST OF THE CASCADE CREST, AND THE WILLAMETTE NATIONAL FOREST.
A HEAT ADVISORY IS IN EFFECT FROM 1 PM FRIDAY UNTIL 10 PM SATURDAY FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON.
A HEAT ADVISORY IS IN EFFECT FROM 1 PM FRIDAY UNTIL 10 PM SUNDAY FOR THE LOWER COLUMBIA RIVER BASIN OF OREGON AND THE FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON.
A HEAT ADVISORY IS IN EFFECT FROM 1 PM FRIDAY UNTIL 5 AM SUNDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE SATURDAY NIGHT FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTHERN OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE NORTHERN OREGON CASCADES, THE CASCADES IN LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

Sunny and warmer today, clear tonight,
Mostly sunny and hot Friday, partly cloudy with a slight (20%) chance of (dry) thunderstorms Friday night,
Partly cloudy and hot with a slight (20%) chance of (dry) thunderstorms Saturday AM, partly cloudy and hot with a slight (20%) chance of showers and thunderstorms in the afternoon and Saturday night.
highs 93-98 lows 58-63.
A mix of clouds and sun Sunday with a slight (20%) chance of AM thunderstorms and a slight (20%) chance of showers and thunderstorms and cooler in afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms Sunday evening, then just partly cloudy late at night through Wednesday.
highs 86-94 cooling to 92 Wednesday lows near 58. (seasonal averages high 76 low 49)

Eugene/Springfield Pollen Count:

Trees: Low- 2

Grass: High- 120

Reading as of: 6/25/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

Sunny and warmer today, mostly clear this evening, partly cloudy late tonight,
Mostly cloudy in the AM, partly cloudy and hot with a slight (20%) chance of thunderstorms Friday afternoon, partly cloudy with a slight (20%) chance of (dry) thunderstorms Friday night and Saturday AM, mostly and cooler with a (30%) chance of thunderstorms in the afternoon, then partly cloudy with a (30%) chance of thunderstorms Saturday night.
highs 94-101 cooling to 99 Saturday lows 62-69 cooling to 65 Saturday night.
Partly cloudy with a slight (20%) chance of thunderstorms and cooler Sunday through Monday, partly cloudy at night and Tuesday, then partly cloudy with a slight (20%) chance of thunderstorms Tuesday night and Wednesday.
highs 93-97 lows 59-62. (seasonal averages high 79 low 53)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

Sunny today, mostly clear this evening, mostly cloudy late tonight and Friday AM, mostly sunny and warmer with a slight (20%) chance of inland afternoon thunderstorms, partly cloudy with a slight (20%) chance of coastal thunderstorms while a slight (20%) chance of inland (dry) thunderstorms Friday night,
Partly cloudy with a slight (20%) chance of (dry) thunderstorms Saturday AM, mostly cloudy with a slight (20%) chance of thunderstorms in the afternoon and evening, then partly cloudy with a slight (20%) chance of thunderstorms late Saturday night.
highs near 65 lows 56-54.
Partly cloudy with a slight (20%) chance of thunderstorms Sunday and in the evening, just mostly cloudy late Sunday night,
Then partly cloudy Monday through Wednesday.
highs 60-64 lows near 54. (seasonal averages high 63 low 51)

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Forecast for the Cascades in Lane County:

Sunny and warmer today, clear tonight,
Mostly sunny and warmer with a slight (20%) chance of dry thunderstorms Friday afternoon, partly cloudy with a slight (20%) chance of (dry) thunderstorms Friday night,
Partly cloudy with a slight (20%) chance of (dry) thunderstorms Saturday AM, partly cloudy and a bit cooler with a (30%) chance of showers and thunderstorms in the afternoon, mostly cloudy with a (30%) chance of evening thunderstorms, then a slight (20%) chance of showers and thunderstorms late Saturday night.
free air freezing level 16,000 ft. today through Friday night, then snow level above 8,000 ft. Saturday and Saturday night.
highs 84-87 cooling to near 85 Saturday lows 54-63.
A mix of clouds and sun with a slight (20%) chance of AM thunderstorms, a bit cooler Sunday with a (30%) chance of afternoon showers and thunderstorms, partly cloudy with a (30%) chance of showers and thunderstorms in the evening, then partly cloudy with a slight (20%) chance of showers and thunderstorms late Sunday night through Wednesday.
snow level above 8,000 ft. Sunday through Wednesday.
highs 82-85 cooling to 83 Wednesday lows 58-62.

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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.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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