Here is my weekly weather quiz question. “What is a “Polar Front?”

ADVISORIES:

• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM FRIDAY ABOVE 1,000 FT. FOR THE NORTHERN OREGON CASCADE FOOTHILLS,  THE NORTHERN OREGON CASCADES, THE CASCADE FOOTHILLS IN LANE COUNTY, AND THE CASCADES IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SATURDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SATURDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 AM FRIDAY ABOVE 4,000 FT. FOR THE EAST SLOPES OF THE OREGON CASCADES.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SATURDAY ABOVE 2,500 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM TODAY UNTIL 10 AM SATURDAY ABOVE 1,500 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY, AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 PM TODAY ABOVE 4,000 FT. FOR THE NORTHERN BLUE MOUNTAINS OF OREGON.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SATURDAY ABOVE 2,500 FT. FOR JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 AM FRIDAY ABOVE 1,500 FT. FOR THE COAST RANGE OF NORTHWEST OREGON AND AND THE CENTRAL COAST RANGE OF WESTERN OREGON.
• A WIND ADVISORY  IS IN EFFECT UNTIL 4 PM TODAY FOR  THE JOHN DAY BASIN.
• A WIND ADVISORY IS IN EFFECT UNTIL 9 AM TODAY FOR THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
• A WIND ADVISORY IS IN EFFECT UNTIL 7 AM TODAY FOR THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, NORTH CENTRAL OREGON, AND CENTRAL OREGON.
• A HIGH WIND WARNING IS IN EFFECT FROM 8 AM MST UNTIL 11 PM MST  TODAY FOR HARNEY COUNTY AND MALHEUR COUNTY.
• A HIGH WIND WARNING IS IN EFFECT FROM 8 AM MST UNTIL 8 PM MST FOR THE OREGON LOWER TREASURE VALLEY.
• A HIGH WIND WARNING IS IN EFFECT FROM 1 AM TODAY UNTIL 4 AM FRIDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.
• A HIGH WIND WARNING IS IN EFFECT UNTIL 7 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST AND AND THE CURRY COUNTY COAST.
• A WIND ADVISORY IS IN EFFECT UNTIL 4 PM TODAY FOR THE GRANDE RONDE VALLEY.
• A WIND ADVISORY IS IN EFFECT FROM 1 AM UNTIL 4 PM TODAY FOR WALLOWA COUNTY.
• A WIND ADVISORY IS IN EFFECT FROM 8 AM MST UNTIL 8 PM MST TODAY FOR BAKER COUNTY.
• A WIND ADVISORY IS IN EFFECT UNTIL 1 AM TODAY NEAR THE BEACHES AND HEADLANDS FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WIND ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR THE NORTH CENTRAL OREGON COAST AND THE CENTRAL OREGON.
• A HIGH SURF ADVISORY IS IN EFFECT FROM 4 PM TODAY UNTIL 10 PM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.

HEALTH ADVISORIES:

• A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE  RIVER.

• Mostly cloudy with AM rain and snow, rain showers and snow showers and breezy (Wind: SW 15-25 mph decreasing to SW 10-20 mph by this afternoon) and a slight (20%) chance of thunderstorms this afternoon (0.50 in. of rain possible, 2-3 in. of snow possible lower elevations 5-8 in. of snow possible higher elevations, AM snow possibly heavy at times, snow level 1,500  ft. rising to 2,000 ft. in this afternoon), evening rain showers and snow showers and a slight (20%) chance of thunderstorms (patchy evening blowing snow), snow late Thursday night and breezy (Wind: SW 15-25 mph) with patchy blowing snow (0.25 in. of rain possible, 3-4 in. of snow possible lower elevations while 4-7 in. of snow possible above 2,000 ft., patchy blowing snow, snow level 1,500 ft. falling to 1,000 ft., evening visibility 0.25 miles or less),
• Mostly cloudy with with AM snow,  rain and snow and a bit cooler Friday afternoon (0.25 in. of rain possible, patchy blowing snow, snow level 2,000 ft.), patchy evening blowing snow, (0.25 in. of rain possible, snow level 1,000 ft. rising to 1,500 ft. Friday afternoon), snow at night with patchy evening blowing snow,
• Mostly cloudy with snow showers Saturday, then snow showers likely (70%) Saturday night.
• highs 54-44 lows 36-30.
• Mostly cloudy with  rain and snow showers and a bit warmer Sunday, rain and snow showers Sunday night,
• Mostly cloudy with rain and snow showers and a bit warmer Monday, rain and snow showers at night,
• Mostly cloudy with rain and snow showers likely (70%) Tuesday and Tuesday night,
• Then mostly cloudy with rain and snow showers Wednesday.
• highs 46-50 lows 33-37. (seasonal average high 56 low 38)

Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy and a bit cooler with coastal showers and a slight (20%) chance of thunderstorms today while AM inland showers and a slight (20%) chance of AM thunderstorms with inland showers and inland showers and snow showers with a slight (20%) chance of thunderstorms and a bit cooler this afternoon (1.00 in. of rain possible, snow level 1,500 ft. rising to 2,000 ft. this afternoon), coastal showers and a (40%) chance of thunderstorms while inland snow showers and showers with a slight (20%) chance of inland thunderstorms tonight (0.50 in. of rain possible, 1 in. of snow possible, snow level 1,500 ft. falling to 1,000 ft. late tonight) and breezy (Wind: SW 15-25 mph).
• Mostly cloudy with coastal showers and a slight (20%) chance of thunderstorms and a bit cooler Friday (0.50 in. of rain possible) while inland snow showers and a slight (20%) chance of thunderstorms Friday (snow level 1,000 ft. rising to 1,500 ft. in the afternoon), evening coastal showers with a slight (20%) chance of thunderstorms and coastal showers and snow showers and a slight chance of coastal thunderstorms at night while inland showers and snow showers with a slight (20%) chance of thunderstorms at night (0.50 in. of rain possible, snow level 800 ft.),
• Mostly cloudy with rain showers and snow showers with a slight (20%) chance of thunderstorms and a bit warmer Saturday, then rain showers and snow showers late Saturday night.
• highs 53-45 lows 38-34.
• Mostly cloudy with AM rain and snow showers, showers and a bit warmer Sunday, showers Sunday night,
• Mostly cloudy with showers and a bit warmer Monday, showers at night,
• Mostly cloudy with showers Tuesday and Tuesday night,
• Then mostly cloudy with showers Wednesday.
• highs 47-52 lows 36-39. (seasonal average high 55 low 41)