Anyone who stays in or drives with the mountain Joaquin Valley during the late autumn or winter months will certainly inevitably suffer Tule fog. Not only does Tule, or ground, fog build in the Great central Valley that California but also in the seaside and inland valleys — specifically after that rains. The first rains the the season moisten the bone-dry ground of summer. When lot of the Earth’s warm is radiated the end to space, usually on clear, windless nights, the cools the moist and also denser great of air close to the valley’s floor.

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Fog is water vapor that has condensed ~ above microscopic corpuscle in the air and formed a cloud in ~ ground level. Once air temperature decreases, relative-humidity levels increase and the valley begins to take it on a grayish tint. As soon as the air has actually reached that is dew-point temperature, the family member humidity is at 100 percent. Water droplets come to be visible come the naked eye. At the point, Tule fog have the right to rapidly develop. Each cubic meter of fog contains between .05 and 0.5 grams of liquid water.

Under these conditions, water droplets have tiny time come grow. They come to be too hefty for the weak waiting currents to support, and they autumn to the ground as drizzle. Drizzle is characterized as water drops with diameters much less than 0.02 inches. That’s really small. Mist water drops room so tiny they stay suspended in the atmosphere.

Heavy drizzle occurs when visibility is less than one-fourth that a mile. Center drizzle happens as soon as visibility ranges between one-fourth and one-half mile. And light drizzle occurs as soon as visibility is greater than one-half mile.

Rain is composed of water drops through diameters higher than 0.02 inches. Rain falls along the central Coast when cold fronts move down the California coastline, creating rapid, upward-moving waiting currents. These upward air currents keep the water droplets rely in the wait column, where they combine and also grow. Raindrops deserve to reach size of as much as 0.25 inches before they fall to the ground.

The intensity of rain is based upon the amount that drops in one hour. Irradiate rain is classified together 0.1 inch or less per hour. Middle rain ranges from 0.11 come 0.3 inches per hour. Heavy rain is greater than 0.3 inches per hour.

This leader to the question of the difference in between rain and also rain showers.

Rain is persistent precipitation end a huge area linked with a warm or cold front. In other words, a rain illustration lasts for a longer time. On the various other hand, rain showers take place in a much smaller area that coverage and also usually have an abrupt start and end and are often linked with convective types of clouds brought about by cold and unstable air that regularly filter in behind cold fronts.

Tips for driving in foggy conditions:
Drive through lights on short beam. High beams will certainly reflect turn off the fog, creating a “white wall” effect.Reduce your speed, and also watch your speedometer. Fog creates a visual illusion of slow activity when you might actually it is in speeding.Avoid crossing traffic lanes.Travel with the driver’s window partially open. Listen for traffic.Watch because that CHP speed cars to guide you.If your vehicle is disabled or you can not continue, pull well onto the shoulder and also turn off lights. Relocate away from her vehicle. Take into consideration postponing your expedition until the fog lifts.

John lindsey is Pacific Gas and Electric Co.’s Diablo Canyon strength Plant marine meteorologist and a media relationships representative.



John Lindsey

Hanford"s seven day forecast

Increasing dried northerly winds will begin to dry out the short level humidity on Saturday right into Sunday, v patchy ground fog developing Saturday night right into Sunday morning. Building high push in mix with weak northerly winds will lug warmer temperatures to the san Joaquin Valley. As whole a really nice weekend is in store across the region except where the fog lingers.

A Pacific weather mechanism will method the Humboldt shore Monday, then gradually move southeast across the central Valley ~ above Tuesday. The device will lug generally light rain south to about a large Sur-Yosemite line late Tuesday morning through a possibility for light showers farther south. Snow levels will selection from 6,500 feet phibìc to 7,500 feet southern as the system moves through, then lower to 4,500 and 6,000 feet phibìc to south Tuesday afternoon. Skies will certainly clear Tuesday evening through fair and dry weather many of Wednesday, then one more potentially stronger and also cooler weather mechanism will move into the an ar Thursday. This system has actually the potential to bring rain showers along with snow in the Sierra Nevada Thursday afternoon right into Friday morning. Wet and unsettled weather could proceed the following weekend, back timing and details are really unclear at the moment.

Temperatures because that Hanford:

Saturday - 60/43Sunday - 68/43Monday - 68/44Tuesday - 67/47Wednesday - 62/44Thursday - 64/47Friday - 58/45ATMOSPHERIC CONDITION:

Santa Lucia (northeasterly) winds will give clear skies and warmer temperatures in the coastal regions, however, dense ground fog will proceed to construct in the inland valleys throughout the night and morning hrs burning turn off to hazy sunshine in the afternoon. Saturday"s high temperature will range between the high 60s in the north County and the high 70s in the coastal valleys. The beaches will reach the mid-70s. These winds will certainly decrease top top Saturday afternoon into Sunday. The winds will rotate onshore on boy name Luther King Jr. Work which will allow marine short clouds and fog to build in the seaside regions.

A change in the weather will occur on Tuesday as a weak cold former will produce increasing clouds with areas of drizzle in the coastal regions. This low-pressure system will create rain as much south together the huge Sur-Yosemite line. Eye levels will start at 7,500 feet yet as the cold front moves with the eye level will reduced to 5,500 feet.

Santa Lucia (northeasterly) winds and partly cloudy skies will build on Wednesday. Raising northwesterly winds and cooler weather is estimate on Thursday. The long-range models are advertising a more powerful storm device next Friday, Jan. 19, into Saturday, Jan. 20, the should develop rain showers. In ~ this time, rain is no expected southern of point Concepcion. Please remember, these room long-range models and will more than likely change.


A prolong duration of higher-energy swell occasions will continue through Jan. 25.

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Saturday"s 5- come 7-foot northwesterly (295-degree, deep-water) swell (with a 14- to 16-second period) will proceed at this elevation into Saturday night. A 5- to 7-foot west-northwesterly (295-degree, deep-water) swollen (with a 15- come 25-second period) will certainly arrive along the coast Sunday, increasing to 9 to 11 feet (with one 18- come 20-second period) Monday. This west-northwesterly (285-degree, deep-water) swollen will additional increase to 12- to 14-feet (with a 16-to 18-second period) top top Tuesday, diminish Wednesday come 9 to 11 feet (with a 13- to 15-second period). A 13- to 15-foot northwesterly (295-degree, deep-water) swollen (with a 17- to 19-second period) will certainly arrive along the central Coast on Thursday and also will stay at this height but (with a 15- come 17-second period) ~ above Friday.