Anyone who resides in or drives through the San Joaquin Valley during the late loss or winter months will certainly inevitably endure Tule fog. Not just does Tule, or ground, fog build in the Great Central Valley of California however also in the seaside and also inland valleys — especially after it rains. The first rains of the season moisten the bone-dry ground of summer. When a lot of the Earth’s warmth is radiated out to area, usually on clear, windmuch less nights, it cools the moist and also denser layer of air close to the valley’s floor.

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Fog is water vapor that has actually condensed onto microscopic pshort articles in the air and developed a cloud at ground level. When air temperature decreases, relative-humidity levels boost and also the valley begins to take on a grayish tint. When the air has reached its dew-allude temperature, the loved one humidity is at 100 percent. Water droplets come to be visible to the naked eye. At that point, Tule fog deserve to swiftly develop. Each cubic meter of fog consists of in between .05 and 0.5 grams of liquid water.

Under these conditions, water droplets have little time to thrive. They become as well heavy for the weak air currents to assistance, and they autumn to the ground as drizzle. Drizzle is characterized as water drops through diameters much less than 0.02 inches. That’s extremely small. Mist water drops are so tiny they remain suspfinished in the setting.

Heavy drizzle occurs when visibility is much less than one-fourth of a mile. Modeprice drizzle happens when visibility ranges between one-fourth and one-fifty percent mile. And light drizzle occurs once visibility is higher than one-half mile.

Rain is written of water drops with diameters higher than 0.02 inches. Rain falls along the Central Coast when cold fronts relocate dvery own the California shore, producing quick, upward-relocating air currents. These upward air currents store the water droplets suspended in the air column, wbelow they incorporate and also flourish. Raindrops have the right to reach sizes of as much as 0.25 inches prior to they autumn to the ground.

The intensity of rain is based upon the amount that drops in one hour. Light rain is classified as 0.1 inch or much less per hour. Moderate rain ranges from 0.11 to 0.3 inches per hour. Heavy rain is higher than 0.3 inches per hour.

This leads to the question of the distinction between rain and rain showers.

Rain is persistent precipitation over a large location associated through a heat or cold front. In other words, a rain episode lasts for a much longer time. On the various other hand also, rain showers take place in a much smaller sized area of coverage and also commonly have actually an abrupt start and also end and are frequently linked through convective forms of clouds caused by cold and also unsteady air that often filter in behind cold fronts.

Tips for driving in foggy conditions:
Drive via lights on low beam. High beams will certainly reflect off the fog, producing a “white wall” result.Reduce your rate, and watch your speedometer. Fog creates a visual illusion of sluggish activity once you can actually be speeding.Avoid crossing web traffic lanes.Travel with the driver’s window partially open. Listen for web traffic.Watch for CHP pace cars to overview you.If your car is disabled or you can’t proceed, pull well onto the shoulder and also revolve off lights. Move amethod from your auto. Consider postponing your pilgrimage until the fog lifts.

John Lindsey is Pacific Gas and Electric Co.’s Diablo Canyon Power Plant marine meteorologist and a media connections representative.



John Lindsey

Hanford"s salso day forecast

Increasing dry northerly winds will start to dry out the low level moisture on Saturday right into Sunday, with patchy ground fog occurring Saturday night into Sunday morning. Building high push in combicountry through weak northerly winds will certainly carry warmer temperatures to the San Joaquin Valley. Overall a very nice weekend is in store throughout the area other than wbelow the fog lingers.

A Pacific weather system will approach the Humboldt shore Monday, then gradually relocate southeastern throughout the Central Valley on Tuesday. The device will certainly carry generally light rain south to about a Big Sur-Yosemite line late Tuesday morning with a possibility for light showers farther southern. Snow levels will certainly array from 6,500 feet north to 7,500 feet south as the mechanism moves through, then lower to 4,500 and 6,000 feet north to south Tuesday afternoon. Skies will clear Tuesday evening via fair and also dry weather the majority of of Wednesday, then an additional perhaps more powerful and also cooler weather system will relocate right into the region Thursday. This system has the potential to carry rain showers in addition to snow in the Sierra Nevada Thursday afternoon right into Friday morning. Wet and unsettled weather could continue the adhering to weekend, although timing and details are very unclear at the minute.

Temperatures for Hanford:

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

Santa Lucia (northeasterly) winds will certainly provide clear skies and warmer temperatures in the coastal regions, yet, dense ground fog will proceed to construct in the inland also valleys during the night and also morning hrs burning off to hazy sunshine in the afternoon. Saturday"s high temperatures will certainly array between the high 60s in the North County and the high 70s in the coastal valleys. The beaches will certainly reach the mid-70s. These winds will certainly decrease on Saturday afternoon right into Sunday. The winds will certainly revolve onshore on Martin Luther King Jr. Day which will certainly permit marine low clouds and fog to construct in the coastal regions.

A readjust in the weather will certainly take place on Tuesday as a weak cold front will develop increasing clouds with areas of drizzle in the seaside regions. This low-press mechanism will certainly create rain as far southern as the Big Sur-Yosemite line. Scurrently levels will begin at 7,500 feet but as the cold front moves through the snow level will reduced to 5,500 feet.

Santa Lucia (northeasterly) winds and also partly cloudy skies will construct on Wednesday. Increasing northwesterly winds and also cooler weather is forecast on Thursday. The long-variety models are declaring a stronger storm system next Friday, Jan. 19, into Saturday, Jan. 20, that should create rain showers. Right now, rain is not expected south of Point Concepcion. Please remember, these are long-variety models and also will most likely readjust.


A expand duration of higher-energy swell occasions will continue via Jan. 25.

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Saturday"s 5- to 7-foot northwesterly (295-level, deep-water) swell (with a 14- to 16-second period) will proceed at this elevation right into Saturday night. A 5- to 7-foot west-northwesterly (295-level, deep-water) swell (through a 15- to 25-second period) will arrive along the coastline Sunday, increasing to 9 to 11 feet (with an 18- to 20-second period) Monday. This west-northwesterly (285-level, deep-water) swell will certainly better rise to 12- to 14-feet (via a 16-to 18-second period) on Tuesday, decreasing Wednesday to 9 to 11 feet (with a 13- to 15-second period). A 13- to 15-foot northwesterly (295-level, deep-water) swell (through a 17- to 19-second period) will certainly arrive along the Central Coast on Thursday and also will certainly reprimary at this height yet (via a 15- to 17-second period) on Friday.