Frost Advisories issued due to frigid overnight temperatures - The CW San Diego - News 8

Frost Advisories issued due to frigid overnight temperatures

Weather Update: Tuesday, February 19, 2019 at 5:41 a.m.

Cold overnight temperatures create a frost risk. Lows in the upper 20s to middle 30s in portions of the County will continue through Wednesday. Another chance of rain will warm overnight temperatures Thursday, but drop afternoon temperatures well below average. Snow levels drop to impressively low elevations Thursday night, with significant mountain snowfall in the mountains.

A Detailed Look at February 19th:

  • Low rip current risk. Water temperature 56-59. West-northwest swell at 2'-3' with sets to 4'. UV index for San Diego is moderate (5).
  • Tuesday afternoon high temperatures will be below seasonal norms. 
    • Coastal highs 57-60, normal around 65.
    • Inland highs 51-58, normal around 70.
    • Mountain highs 42-50, normal around 53.
    • Desert highs 58-63, normal around 72.
  • A Frost Advisory is in place for the inland valleys until 9 AM Tuesday and from 10 PM Tuesday until 9 AM Wednesday. The San Diego deserts will also be under the Frost Advisory from midnight Wednesday morning until 9 AM Wednesday. A cold air mass and clearing skies will have temperatures fall into the upper 20s to  middle 30s in the mornings. Cover sensitive plants and provide shelter to pets and livestock. 
  • Humidity is still dry as the cold air mass limits moisture in the air. Dew points in the low to middle 30s for the coast and inland, staying in the 20s in the mountains and deserts. Dew points are not expected to change too much Tuesday.

The Week Ahead:

  • Temperatures will warm slightly through Wednesday as low pressure weakens. Skies will clear but overnight temperatures will remain cold.
  • A cold, deep, and strong trough of low pressure will enter Southern California Wednesday afternoon. This will bring another blast of frigid polar air and a chance for rain. Snow levels are expected to drop may drop to below 2000' Thursday night. Several inches of snow can be expected in the mountains again Wednesday through Friday morning. The second round of preliminary snow totals have increased, showing up to two feet of snow for Mt. Laguna and Palomar Mountain! 
  • Weekend temperatures will warm slightly and the skies clear as the trough exits the region. Higher pressure will enter the region, warming temperatures will approach the low 60s for the coast, valleys, and deserts for the weekend. Warming temperature trend may even continue into early next week. 
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