Thunderstorms from Wednesday afternoon have been much more isolated than earlier in the week. As expected, most of the action has been in southern Lake County and in southern Modoc and Siskiyou Counties. Northern California will see a few storms on Thursday, but the remainder of the region will stay mainly dry.
Air quality has improved Wednesday as well. Most locations that were reading in the “Unhealthy” or “Unhealthy For Sensitive Groups” categories have now been lowered to “Moderate,” which means there is only a moderate health risk for certain groups. That would include those with lung or heart diseases or other respiratory illnesses. The smoke has also thinned out in the Rogue Valley, as winds have kept the smoke plumes from the fires in burning in Siskiyou County mainly to the south.
The storm risk is back for northern California on Thursday, but expect only an isolated threat, mainly in Siskiyou County. Southern Lake County could see one or two storms also, but once again, activity will be very isolated. The next trough that swings through in the upper atmosphere brings a few more isolated storms to areas mainly east of the Cascades. Also, the trough that passes will produce some potentially gusty winds in the Klamath Basin, which may be an issue for the fire fights in the region.