Provided / Alertwildfire.org The forecast this week for Lake Tahoe calls for mostly sunny skies with possible rain and thunder early in the week. The National Weather Service is forecasting warm and dry spring conditions on Monday before a low pressure system drops into the region Tuesday and Wednesday with cooler temperatures, increased winds and chance for showers and thunderstorms. Monday’s high will reach into the mid 60s before dropping to the mid to high 50s on Tuesday and Wednesday. The service is calling for a slight chance of showers between 11 a.m. and 5 p.m. then possible thunder later in the day. The snow level starts at 7,000 and rises to 7,800 in the afternoon.