The biggest wallop of the strongest storm since October 2008 is expected to slam the Northern San Joaquin Valley today just before noon.

The National Weather Service modeling calls for heavy rain — as much as 5 inches in some areas — along with sustained winds of 25 to 50 mph with gusts over 60 mph to continue until shortly after midnight Friday. The high-wind gusts may topple trees and cause power outages.

Delta College in Stockton has cancelled all classes today. Public schools in San Francisco and Oakland will also be closed today.

The strongest winds will hit the San Francisco Bay Area between 8 a.m. and 1 p.m. today. The forecast calls for as much as 8 inches of rain to fall in some coastal mountains as Northern California is pounded by hurricane force winds. Ski resorts in the northern Sierra could get more than 2 feet of snow before the storm moves through Southern California.

Manteca has had street crews working diligently to clear debris from storm grates. They will also be out in force today to handle flooding issues.

Manteca city officials advise residents to take the following steps prior to the storm hitting:

• Pick up loose leaves to reduce the risk of street flooding.

• Bring in patio furniture, holiday decorations, and other lose items that may blow over.

• Have an emergency kit with flashlight available.

They also recommend if there is an outrage to avoid using candles if possible and rely on battery operated flashlights. If candles are your only option keep them away from drapes, lampshades and small children. Do not leave candles unattended.

Also, if you see a downed power line assume they are energized and stay away. Do no remove fallen tree limbs or other debris from fallen lines.

If you are experiencing localized problems as the result of the storm, the city is asking that you call either the:

• police department’s non-emergency number at 209.456.8101 or

• fire department’s non-emergency number at 209.464.4650.