Cold front to move in on Friday
One more day of beautiful autumn weather is expected today as high pressure remains over the Great Basin. Low temperatures this morning will still stay below freezing at most Lake Tahoe locations, with readings in upper 20s to lower 30s.
Milder temperatures are in the forecast for Friday morning, with readings in the mid to upper 30s due to clouds and winds. Today will be the warmest day of the week so far with highs projected to reach into the upper 60s to mid 70s around the Basin.
An upper-level low pressure trough dropping south from the Gulf of Alaska, combined with a weak upper low off the Northern California coast will bring an increase in clouds and south winds around 10 to 20 mph this afternoon.
Winds will continue to increase on Friday ahead of an approaching cold front with 15 to 30 mph southwest winds expected at Lake level and gusts to 70 mph along the Sierra crest. Some light precipitation is forecast Friday afternoon and evening along this fast-moving frontal band but no significant accumulation of rain or snow expected. Motorist traveling over mountain passes may encounter some light snow Friday evening and overnight but not enough to cause any travel problems. Light snow will typically melt quickly on road surfaces this time of year due to the residual ground heat from a very warm summer.
Temperatures are expected to drop into the mid 50s to lower 60s Friday and Saturday, or around 10 to 15 degrees cooler than today. Saturday and Sunday will be mostly sunny days following the front, with high temperatures creeping back into the mid to upper 60s Sunday afternoon.
Another cold front dropping south from the Pacific northwest will bring strong southwest winds to the area Sunday afternoon. There will be a chance of rain and high-elevation snow on Monday as the front moves across the area, but only light amounts are expected at this time, with the jet stream support forecast to stay just north of the Tahoe area.
— Tom Cylke is a retired meteorologist having forecasted weather in the Reno and Lake Tahoe area with the National Weather Service since 1974. He can be reached at email@example.com.