Thursday, 12 January 2023, 18:00 UTC
Issued: Thursday, 12 January 2023, 18:00 UTC
A very wet weather pattern is persistent over the western part of the US, bringing excessive precipitation to the state of California. Another round of storm activity is expected over the weekend lasting until Wednesday, January 18, with precipitation totals up to 250 mm in the Sierra Nevada.
Since the Christmas Days a persistent trough structure over the Eastern Pacific is dominating the weather across the western part of the US, with strong extratropical lows bringing excessive precipitation to the state of California. Along western facing flanks, precipitation totals reached more than 1000 mm, with multiple meters of fresh snow accumulation at higher altitude, especially along the Sierra Nevada.
@CaltransDist10 Caples Lake Maintenance has been working tirelessly to clear snow from SR-88 @ Carson Spur in Alpine County. The ETO now is 6 pm. Weather can effect road conditions without notice. Check https://t.co/sgfT02reme or call 1-800-427-7623 for road information.#besafe pic.twitter.com/zLwBSxCrDK Check out this drastic transition from #drier than normal #soils back in Nov '22 to near record wetness in Jan '23 for much of #California thanks to #atmosphericriver parading in multiple rounds of #storms (from SPoRT-LIS 0-100cm Soil Moisture Percentile product) #CAwx #Flooding pic.twitter.com/gNZWTQtEuG Saturday, 7 January 2023, 12:00 UTC
Issued: Saturday, 7 January 2023, 12:00 UTC
A very wet weather pattern over California continues over the weekend with another round of powerful storms hitting the state, bringing intense precipitation and high winds. At higher altitudes substantial snow fall is expected. Up until Wednesday, January 11, over 250 mm of precipitation are expected in the Sierra Nevada.
A strong trough over the Eastern Pacific is persistent since the Christmas Days, bringing a series of extratropical storms into California. The past systems have already brought intense precipitation to the state, upwards of 500 mm since December 26, 2022, along the western flanks of the Sierra Nevada. Leading to fresh snow accumulations of up to 300 cm at Mammoth Mountain, CA. In the Central Valley, in cities like Sacramento, CA received up to 160 mm of rain since Christmas, relieving the drought concerns in California.
Slightly updated versions are available here to correct a small error in the date labeling on the graphic. pic.twitter.com/ufj5hkiPxF Several forecast points are expected to reach monitor/flood stage this weekend-early next week as additional rounds of moderate to heavy rain bring renewed flooding concerns to interior #NorCal. Wednesday, 4 January 2023, 11:00 UTC
Issued: Wednesday, 4 January 2023, 11:00 UTC
Another powerful storm is expected to hit California later today, accompanied by excessive precipitation upwards of 75 mm/24 h in the valley regions and more than 100 mm/24 h in the mountains. Accompanied by powerful winds with gusts up to 100 km/h in the Central Valley. At higher elevations significant snow accumulations up to 1 m are possible. Small stream flooding is likely.
After a very wet December in California, locally the wettest December on record, a potent atmospheric river brought intense precipitation to California on New Year's Eve, with storm totals exceeding 300 mm in the Sierra Nevada. While San Francisco, CA recorded the second wettest day on record on New Year's Eve with a daily precipitation of 138.7 mm at the station San Francisco Downtown, just shy of the all-time record.
Rain and mountain snow develops Wednesday over NorCal becoming heavy Wednesday night. #CAwx pic.twitter.com/2p6FbrQHCL Friday, 30 December 2022, 13:00 UTC
Issued: Friday, 30 December 2022, 13:00 UTC
A very wet weather pattern is expected to set in over the western part of the US. With a zonally aligned flow over the Eastern Pacific air masses of tropical origin get advected into California, leading to abundant precipitation as well as extreme snowfall in the Sierra Nevada.
With a strong zonally aligned flow, a very wet weather pattern is expected in the coming days in California. The combination of a trough over the Northern US and Southern Canada and a ridge over the southwestern part of the US and northern Mexico will lead to the advection of moist air masses into California. When the westerly flow reaches the Sierra Nevada strong orographic lift is induced, leading to a sharp increase in precipitation. Further, these systems are expected to bring high winds into California, especially along the ridge crest of the coastal mountain ranges and the Sierra Nevada.
Despite the brief reprieve from precipitation today, the next seven days will be active across the West as several waves of moisture produce widespread 2-6" rainfall totals in coastal portions of the region, with higher terrain expected to receive several feet of snow. 🌧️❄️ pic.twitter.com/FmeaoMUbHV Issued: December 30, 2022, 13:00 UTC KG Issued: January 4, 2023, 11:00 UTC KG Issued: January 7, 2023, 12:00 UTC KG Issued: January 12, 2023, 18:00 UTC KG |