{ "number": 214, "headline": "February 18, 2024 Week Ahead", "standfirst": "Warming trend accelerates into March", "desk": "notebook", "dateline": { "place": "Weather Trader", "state": null, "lat": null, "lon": null, "site_key": null, "site_name": null, "site_url": null, "accent": null }, "edition": "2024-02-19", "published": "2024-02-19T00:26:19.106000Z", "updated": null, "access": "free", "body_html": "
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Sunday evening update

Heavy rain and mountain snow underway across California which could evolve into severe weather on Monday as warmer air from the south cuts under cooler air aloft. The atmospheric river will dump trillions of gallons of precipitation including 6 to 10-feet of snow in the Sierra.

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This storm is not a bomb cyclone or particularly intense but it is located optimally for huge surge of onshore moisture. After Wednesday, the West Coast may get a little break from the action.

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SPC Day 2 Categorical Outlook (slight) with 5% Tornado

Rare to see California as the focal point for Lower 48 severe weather, but the rest of the nation is relatively quiet. Storm chasers are heading to the Sacramento Valley \u2014 not kidding.

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Severe weather chances are slight, but could be a tornado in the Sacramento Valley.

From SPC: 

   Over portions of the Sacramento\n   Valley in CA, the low-level moisture return beneath cold\n   temperatures aloft, will foster enough buoyancy to support organized\n   thunderstorms with some severe potential given the presence of\n   vertical wind shear.
\"\"

Total rainfall over the next 3-days will top 2-inches in LA and 1.5\u201d in San Francisco. Could be up to 4-6\u201d along the coastal higher elevations. The snowfall in the Sierra will be the conversion from 7-9\u201d of QPF to snow, so 7-10 feet, or more.

Daytona 500 Monday 4 PM ET

We\u2019ll see if the rain/sprinkles finish up by early afternoon. May still be dealing with light rain until 2 PM ET, at least according to this model output (HRRR 18z).

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Very Warm Pattern into March across Lower 48

Week 1 | February 18-25, 2024

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Week 2 | February 25 - March 3, 2024

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A bullseye of 10-18\u00b0F above normal centered upon Iowa including the Midwest and Great Lakes heading into the first week of March. Whoa!

More Ensemble Clustering Tools at Weather Trader

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I\u2019ve updated the Clustering Tools \u2014 here is the 4-panel panel of the ensembles from ECMWF EPS, NOAA GEFS, and Canada GEPS + the 103 member mean in the animation above.

Rather than posting too many maps and filling your email inbox, you can see these Clustering Tools freely at WeatherTrader.com: and continue to support these products (which will earn any subscriber to this Substack a golden ticket into the Weather Trader interface as founder/supporter, and friend of Ryan)

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Lower 48 Temperatures

Monday Highs | February 19, 2024

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Temperatures continue to warm up \u2014 and will be Spring Fever by later in the week. Enjoy the sunshine and beautiful weather east of the Rockies.

WPC 7-Day Precipitation Totals

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Next 10-days precipitation type + MSLP:

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We lost the Nor\u2019easter. Instead, looking at the 8-10 day range for a weather system that looks mostly wet heading into Leap Day.

15-Day ECMWF EPS Median Snowfall

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And, the 15-day ECMWF median does not show any major snow storms on the map east of the Rockies.

Stick a cork in Winter in the East?

(Maps from weathermodels.com and weathertrader.com)

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Sunday evening update

Heavy rain and mountain snow underway across California which could evolve into severe weather on Monday as warmer air from the south cuts under cooler air aloft. The atmospheric river will dump trillions of gallons of precipitation including 6 to 10-feet of snow in the Sierra.

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