Update 5 – Storm 41 Precipitation Analysis
Storm 41 Precipitation - Storm Total
Storm 41 - Day 3 - April 13
Storm 41 - Day 2 - April 12
Storm 41 - Day 1 - April 11
Update 4 – Monday April 12 2:30 p.m.
The skies are popping with THUNDERBOOMERS!
Update 3 – Sunday April 11 9 p.m.
Fresno got cold air and light rain. The hard driving southeasterly wind was blocked by Junipero Serra Peak, which also placed Fresno in a long rain shadow. Maybe .2 of an inch out of the main cloud band for us, but heavy rain on either side of us, including just up Freeway 99 in Merced. The storm center just off California's Mendocino coast is crossing onto land. The center is very strong, bringing cold air all the way down from the Gulf of Alaska in less than two days.
Update 2 – Sunday April 11 10 a.m.
What a fine specimen we have here! A perfect comma! Coming up from the south along the comma, headed for the cyclonic center located off California's lush Mendocino Coast, a powerful feed of subtropical moisture from the southeast riding very strong winds. This storm would have been a major event in the dead of winter. But placed in April, it is a weird late-season storm. Even Sierra Summit has all but closed for the summer already. They'll be operating the ski lifts a couple of more weekends. You have to see the animated sequence from this satellite to appreciate how fierce the flow of winds along the cloud band is. As the storm slowly advances eastward onto land, the fierce southeasterly gales run right along it like water through a hose. South facing mountain slopes will get the brunt of the winds in that cloud band, orographically generating enhanced amounts of rain, while north facing slopes and canyons will generate very fierce downhill winds and drier conditions. So when out storm-chasing this California comma, to get wet, visit a south slope. To dry off, drive around the bend.
Weather service activity
Blowing dust warning for western Nevada: MINERAL AND SOUTHERN LYON COUNTIES, WESTERN NEVADA BASIN AND RANGE INCLUDING PYRAMID LAKE
My eastern San Joaquin Valley’s special weather statement has been withdrawn. We don’t live on a south-facing slope to catch extra moisture nor are we near a north facing slopes to experience strong winds.
Update 1 – Sunday April 11 2 a.m.
Meet Storm 41, a beauty not unlike the drencher that started off the year on October 11, 2009.
So far, the key feature of this storm is wind, and lots of it. The entire Central California on out into the central desert of Nevada is under strong wind warnings, and a gale warning is out on the coastline.
The big plume of water vapor aloft is not getting any rain cloud building action yet. The actual location of the storm is still well offshore. When it moves in, the sky will begin to produce. How much rain may fall is a mystery at this point, but orographic uplift should produce impressive results as it hits the mountain ranges. It’s cold outside, so frozen precipitation will be the story in the Sierras.
National Weather Service:
Winter storm warning: * SNOW ACCUMULATIONS: 16 TO 26 INCHES OF NEW SNOW IS LIKELY.
Hazardous Weather Outlook: CENTRAL AND SOUTHWESTERN SAN JOAQUIN VALLEY.
Wind Advisory: STRONG SOUTHERLY WINDS. DOWNSLOPING EFFECT WILL
CAUSE VERY STRONG SOUTHERLY WINDS THROUGH THE GRAPEVINE. LEMOORE… AVENAL… MERCED… LOS BANOS… COALINGA…MENDOTA. Difficult driving on I-5.
High Wind warning, the Grapevine and Tejon Pass: SOUTH WINDS WILL BE 25 TO 35 MPH WITH GUSTS TO 75 MPH.
Gale warning: THE PASSING FRONT WILL BE CAPABLE OF PRODUCING GALE FORCE WINDS TO 35 KT WITH GUSTS TO 4O KT…RAIN AND THUNDERSTORMS AND CHOPPY SEAS.