December 30, 2019 at 8:21 am

Pacific System Misses Southern California; But Will Generate Santa Ana Wind Conditions For The Next 24 Hours; Trucker Alert

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A Pacific System has missed Southern California for the most part with only scattered dynamics.  Off and on snow showers are still likely for the Cajon Pass to LA/SBD/RIV Mountains with wrap-around moisture and a wind storm is brewing for the Kern/Gorman/Ventura/Santa Barbara Mountain for Wednesday so read on for details …

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The system is well southwest of the forecast area.  This means that northeast flow is pulling into it and while the north/northeast/east sections of the Los Angeles, San Bernardino, Riverside County Mountains will have some snow, the main concern is the strong winds below the passes and canyons.  The wind model remains the same as the previous update and those images will be put below this article for you.

As for the Wednesday event.  There will be a storm system that slides to the north and east of the forecast area on Wednesday.  A powerful northwest flow with it will bring a High Wind Watch issuance criteria for the Kern/Ventura/Santa Barbara County Mountains, which will include the Gorman Pass region so this alert is going to go out soon.

The January 2020 forecast will be released in the next day or two.  Preliminary estimations are that temperatures will be colder than average for most of the month with a mix of average in there.  My rainfall forecast called for 9-13″ of rain for Downtown Los Angeles for the season and so far we are at 7.00″ of rain.  For January 1st that is about on track to normal… but January could be drier than normal and my rain forecast will look to come more true.  I’m not a least bit afraid I know January or February will be drier than normal… I do not think we will see both months above average.  So far the season is going to the October video release for the season forecast (Click Here To View It)

Santa Ana Wind Advisory is in effect for Ventura Coast/Basin … SCV/SFV … San Gabriel Valley along and north of the 210 … Channel Islands … Orange County Basin and Santa Ana Mountains … I-15 Corridor from Corona to Cajon Pass … Riverside Mountains Idy/Anza/Aguanga … San Diego Mountains … Eastern Imperial County Glamis/Winterhaven … Needles forecast area … it reads – A strong storm missing to our west will generate a surface low southwest in the ocean.  This surface low will bring strong offshore gradients into the area and Santa Ana Winds will begin on today across the region, going through tonight, and ending over the day on Tuesday.  The new style here at SCWF is to not talk about it much, but show you the SCWF wind model with the Martin Wind Gust Scale and those images are below.  They are valid today through Tuesday, maximizing overnight tonight.

Trucker Forecast:  (Intensity 5 and higher locations for roll-over risks) – Bottom of the Cajon Pass along the 210 – Along the 210 through Tujunga into Santa Clarita – Along the 126 between Fillmore and Santa Paula – I-8 Corridor through the SD Mountains –

Martin Wind Gust Intensity Scale –

8. Extensive widespread damage.
7. Trees are broken or uprooted, building damage is considerable. – High Profile Vehicle Roll-Over CERTAIN.
6. SOME Trees are broken or uprooted, building damage is possible. – High Profile Vehicle Roll-Over Likely, Do NOT recommend Traveling in this zone
5. Slight damage occurs to buildings, shingles are blown off of roofs. HIGH WIND WARNING CRITERIA – High Profile Vehicle Roll-Over Possible if weight is not corrected.
4. Twigs and small branches are broken from trees, walking is difficult.
3. Large trees sway, becoming difficult to walk. POWER SHUTDOWN THRESHOLD WIND ADVISORY CRITERIA
2. Large tree branches move, telephone wires begin to “whistle”, umbrellas are difficult to keep under control.
1. Small trees sway.

VT/SCV
LA/OC/IE
Cajon Pass
RIV Mtns
SD Mtns
Imperial
Needles

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