NATIONAL WEATHER SERVICE FLOOD ADVISORY

FYI:  I am getting my updates from MyMotherlode.com.  I deem them important enough for those of you who are part timers as well as full time residents to ensure that you know what's happening around us.

 

August 20, 2013    02:50 pm   Mark Truppner, MML Reporter 

 

The National Weather Service has issued a small stream Flood Advisory for both northeast Mariposa and central Tuolumne Counties until 5:45 PM.

At 2:50 PM a strong thunderstorm was estimated to produce one to two inches of rain over the past hour. Another inch is possible.

Drainage into the Tuolumne River is expected for this event.

Excessive runoff from heavy rainfall will cause elevated levels on small creeks and streams... and ponding of water on country roads and farmland along the banks of creeks and streams.

Do not drive your vehicle into areas where the water covers the roadway. The water depth may be too great to allow your car to cross safely. Move to higher ground.

Additionally, a Significant Weather Advisory is in effect for southwestern Alpine County and north central Tuolumne County until 5:15 pm.

At 4:18 pm doppler radar indicated that an area of thunderstorms were rapidly developing near lake Alpine and moving north at 10 mph.

Hail up to the size of pennies is expected with this storm along with frequent dangerous lightning.

Locations impacted include... Highway 108... Highway 4 Shriner Lake campground... Upper Blue Lake... Kirkwood ski area and Carson Pass...

If threatening weather approaches your area, take shelter in a sturdy building.

A Red Flag Warning remains in effect through Wednesday 11 PM for the Mother Lode from 1000 through 3000 feet and the Stanislaus National Forest.

Gusty winds and lightning are possible through this period. Thunderstorms should contain some rainfall and become wetter with time. Stronger storms may produce abundant lightning and small hail. The best chance for thunderstorms will be late Wednesday. Some storms may extend into the central valley.

Local wind gusts of over 40 to 50 mph are possible.

Lightning strikes may create new fire starts. Erratic winds from the thunderstorms may cause fires which develop to spread rapidly. The greatest threat of thunderstorms will be during the afternoon and evenings.

The low pressure system will remain over northern California through Thursday morning. A Red Flag Warning means that critical fire weather conditions are either occurring now... or will shortly.

Written by Mark Truppner