NOTES ABOUT SOUTHERN CALIFORNIA WEATHER & CLIMATE
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Weathernotes Archive September 2006

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GOES-11 Visible Satellite Photo 7:30 a.m. PDT 9/14/06Click!
GOES-11 Visible Satellite Photo
7:30 a.m. PDT 9/14/06.

A Few Sprinkles Around Southland. MEI Exceeds El Niño Threshold.
Weathernotes for Thursday, September 14, 2006.
(Any updates will be found at the end of this discussion.)

A shortwave wrinkle in a broad upper trough over the West, associated vorticity, and an 80 kt. jet max nosing into Southern California combined to produce a few showers in the area this morning. The NCEP WESTNMM high resolution model indicated the vorticity and jet max in its forecast.

All of this is ahead of cold front forecast to move through the area during the day tomorrow (Friday). This GOES-11 Visible satellite photo from 7:30 this morning shows the front moving through Northern California, as well as the marine layer and mid-level clouds over our area. (Note the cloud shadows on the stratus.) The cold front isn't expected to produce any rain in the Los Angeles area, and should result in a beautiful Fall-like weekend with mostly clear skies and moderate temperatures. We'll see!

Dr. Klaus Wolter's Multivariate ENSO Index (MEI) for July/August increased to 0.75, and as Dr. Wolter points out, this is a an increase of more than 1.3 standard deviations in four months, and moves the MEI well above the weak El Niño threshold, as defined by the index. A TAO/TRITON 5-day depth average temperature section plot inidcates a large area with averaged subsurface (surface to 300m) temperature anomalies exceeding 1°C.

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