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NWS San Diego

Jan 8 • 8 tweets • 4 min read

(1/8) We have quite the storm this week. We will lay out the impacts in this order:
1. Rain and Flooding
2. Wind
3. Snow
4. Hazardous Marine Conditions
Please read through the full thread & know that we are always looking at/updating the forecast as we get new information.
#CAwx

(2/8) Scattered showers will be possible as early as Mon morning across northern areas & will spread to the southeast by Mon night. The heaviest/most widespread rain will occur Tue morning/afternoon, and flooding will be possible. T-storms will also be possible during this time.

A ⚠️ FLOOD WATCH ⚠️ has been issued for our northern areas, where the heaviest rain/highest rain rates are expected. Thunderstorms will be possible on Tuesday; rain rates may exceed 1"/hr with the heaviest cells. There will be a HIGH risk for flooding near recent burn scars.

@NWSWPC

The @NWSWPC has expanded their MODERATE RISK for excessive rain leading to flooding into Orange County and portions of Riverside/San Bernardino Counties. This means there will be the potential for numerous flash flooding events, with significant flooding possible.

Next up: Wind. A High Wind Warning has been issued for the San Bernardino County Mountains into the High Desert from Mon morning through Tue evening. Winds will increase tomorrow for these areas, spreading to the remainder of SoCal on Tuesday.

Snow: this system is looking quite warm, with snow levels starting above 8000 feet on Mon, eventually falling as low as 5500 feet later in the day on Tuesday. Very heavy snow will be possible above 7000 feet.

Finally, strong southerly winds and steep combined seas are likely for much of Monday and Tuesday. A Small Craft Advisory is in effect for the coastal waters for very hazardous boating conditions.

That's it! PLEASE remain weather aware the next several days. This could be a highly impactful system, and you don't want to be caught off guard with rapidly changing conditions. Use caution when traveling and allow for extra time to reach your destination.
#CAwx

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More from @NWSSanDiego

NWS San Diego

@NWSSanDiego

Jan 7

(1/5) After a quiet weekend weather-wise, the next in a series of storm systems will begin to impact SoCal next week. Widespread moderate to heavy rain (with a slight chance of t-storms) and very strong winds can be anticipated. The heaviest precip is expected across SBCo Mtns.

(2/5) Rain may develop as early as Mon morning across Orange/San Bernardino Counties, with light rain spreading southeastward through the day. However, an increase in activity is expected through Monday night, with with heaviest and most widespread rain occurring on Tuesday.

@NWSWPC

(3/5) The @NWSWPC is outlooking a SLIGHT RISK for excessive rain leading to flash flooding across portions of Orange, San Bernardino and Riverside Counties. Rain rates could be very high in the strongest cells, so remain alert for flooding.

Read 5 tweets

NWS San Diego

@NWSSanDiego

Jan 1

(1/4) The first week of 2023 looks quite stormy! After rain diminishes tonight, the next chance for widespread rain looks to develop tomorrow night-Tue morning. The rain isn't expected to be as heavy as last night, but widespread accumulations are expected.

(2/4) Rain will increase from northwest to southeast Monday night. Preliminary rain totals are as follows:
Coast: 0.50-0.75"
Valleys: 0.40-0.75"
Mountains: 0.50-1.00"
Deserts: 0.01-0.20"

(3/4) Another, and potentially significant storm system, looks to move into Southern California late this week. Rain amounts are uncertain at this time, but could be significant. Tune in over the next few days as we refine the forecast!
#CAwx

Read 4 tweets

NWS San Diego

@NWSSanDiego

Dec 30, 2022

2023 is bringing us an #AtmosphericRiver for its arrival! Because 280 characters is never enough to summarize these, here's another 🧵of our updates and what we're expecting! #CAwx (1/6)

We've hoisted a Flood Watch for tomorrow evening given the potential for widespread rainfall everywhere from the mountains westward. Use extra caution if you're out and about! Travel will be dangerous given rain, lots of folks on the road, and... other reasons🥴#IYKYK #CAwx (2/6)

It'll also be windy during the daytime on Saturday, the kinda wind that likes to transport trash cans, unsecured holiday decor, and other loose objects. Use caution if traveling in a high-profile vehicle as well. #CAwx (3/6)