Super soaker ‘Pineapple Express’ organizing for heavy rain in California this weekend – as much as 20 inches in some areas

Watts Up With That?

WUWT contributor Dr. Ryan Maue writes on his Twitter feed:

Can’t ask for better setup for enormous rainfall totals over NorCal & now linto Bay Area in 5+ days

Looking at the model output below, I tend to agree, if the pattern holds. It sets up Northern California for the perfect orographic lifting enhancement in the Sierra Nevada mountain range that will not only provide a bounty of liquid precipitation, but a significant boost to the well below normal California snowpack.
pineapple-expressMost or northern California will get some benefit from this “super soaker” storm:

west-coast-QPF1The Quantitative Precipitation Forecasts show some parts of Northern Calfornia getting as much as 20″, along with many mountain areas getting 5″ or more.

norcal-QPFHow much will be snow? That’s anyone’s guess at this time, it depends entirely on how much air and moisture is advected into the low pressure system to collide with colder…

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2 thoughts on “Super soaker ‘Pineapple Express’ organizing for heavy rain in California this weekend – as much as 20 inches in some areas

  1. Douglas Keachie February 2, 2015 / 10:33 pm

    Yes, how much snow will be added to the pack. Given that the Central Sierra Snow Lab sits at about 7,000 feet, and that NOAA, the government folks indicate rain at that altitude, I will be very interested to see how that works out. Got here by way of your 2008 post that claims the Sierra Nevada is not warming. Your charts there may need a little updating.

    • Russ Steele February 3, 2015 / 8:15 am

      Really, this is only one storm. The temperature of the Sierra is over much longer period.

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