A change in the weather pattern is in swing. We will see a slight break from the scorching heat for a few days. This will also come with afternoon thunderstorms. Today, afternoon highs were only a few degrees below what they were yesterday. We still sit well above average, but every afternoon we will see these temperatures come down. By Wednesday, much cooler arctic air is moving into the region and a cold front passing Tuesday night will drop temperatures below average. Between this weekend and mid-week we will drop 10-20 degrees in afternoon highs.
An upper level low pressure system is slowly moving south down the coast and a trough is what will usher in this cooler air. However, a few disturbances will swing through the trough, and this mixed with atmospheric moisture and the daytime heating creates instability. The unstable air cause thermals to rise throughout the day and eventually become thunderstorms in the early to late afternoon.
The last eight hours on the satellite and radar has shown that instability is greatest in Northern California and parts of Southeastern Lake County. Abundant lightning, gusty winds, and locally heavy rainfall are all threats with the storms passing. We’ve received several spotter reports in throughout the afternoon. In Carrville, CA hail up to a half an inch was reported just before 5 p.m. Heavy rainfall was reported in Cedarville, CA, up to .32″ in just under a half an hour. A strong cell moving through Western-Central Modoc County created plenty of lightning and very heavy rainfall in just a matter of an hour. So much so, that a Flood Advisory was issued for areas around CA-139 until 8:45 p.m. 1-4″ of rainfall had fallen in just an hour and a half.
A RED FLAG WARNING is in effect for Eastern Siskiyou and Modoc County until 9 p.m. Sunday, due to the lightning and low humidity, plus afternoon winds. Storms seem to be dissipating as daytime heating is coming to an end. Some activity is expected overnight with the strength of these storms. A FIRE WEATHER WATCH is in effect from Monday morning through Tuesday evening for the thunderstorm hotspots. This includes the Shasta Valley and the Cascades. Thunderstorms are expected to continue at least until Tuesday.
After that time, high pressure will once again make it’s return to the area and we will dry out and warm up. Expect the triple digits, once again, next weekend.
Thanks for logging on and have a great week!
Meteorologist Seth Phillips
Photos Submitted Today:
Teri Sites: Mammatus Over Merrill, OR
Shane Lee Smith: Afternoon clouds visible from Eagle Point.
Katie Corey: Rogue River 7-20-2014 “Peach sherbert skies.”
Prema Clinton: Eagle Point Sunset
Terry Croft: Last Day at the County Fair