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111 publicaciones40 participantes16 publicaciones hoy

This morning we saw the first ever tornado warning issued for San Francisco. Seeing many reports of wind and water damage around NorCal today.

A tornado may not have actually touched down in SF but, with the direction the climate is going, I'm glad to know our alerting systems work.

Take it from those of us in fire country and who have friends and family who've lost houses, loved ones, and more to delayed alerts: it's far better to err on the side of caution.

Continuó el hilo

Occasionally, when we do see winter storms w/even modest instability by "Tornado Alley" standards, they can generate severe t-storms & bring damaging winds, torrential downpours, and even occasionally waterspouts/brief tornadoes. We saw this often in 2022-23 winter. #CAwx [5/7]

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In CA, the missing ingredient for severe t-storms & related phenomena, like tornadoes, is usually atmospheric instability (i.e., strong buoyancy of the air in the lower atmosphere)--not wind shear. Winter storms often bring wind shear, but usually little instability. #CAwx [4/7]

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2) So far as I know, this was indeed first such warning ever issued for SF proper (but not first tornado in SF!). Other similar warnings have been issued elsewhere in Bay Area under similar conditions (i.e., offshore waterspout potentially moving ashore as tornado). #CAwx [2/7]

A few notes on this morning's #Tornado Warning for San Francisco from NWS Bay Area (I am still traveling, so my live interactions are still somewhat limited):

1) Yes, a formal warning was issued by NWS for San Francisco this AM based on a suggestive radar signature. #CAwx [1/7]

#CAwx
Storm surge from southerly winds and large surf will cause King Tides to be higher than predicted. This will cause salt water flooding of areas that normally remain dry during high tide on Saturday. Areas at risk are low lying areas along the immediate coast. Avoid driving through flooded roads.

#EKA #CAwx 044
WHUS46 KEKA 132128
CFWEKA

URGENT - IMMEDIATE BROADCAST REQUESTED
Coastal Hazard Message
National Weather Service Eureka CA
128 PM PST Fri Dec 13 2024

CAZ109-141100-
/O.NEW.KEKA.CF.W.0002.241214T1600Z-241214T2000Z/
Mendocino Coast-
128 PM PST Fri Dec 13 2024

...COASTAL FLOOD WARNING IN EFFECT FROM 8 AM TO NOON PST
SATURDAY...

* WHAT...High astronomical tide and large surf will cause
moderate flooding in low lying areas along the Mendocino Coast.
mesonet.agron.iastate.edu/vtec

Iowa Environmental MesonetKEKA Coastal Flood Warning #2Northern Humboldt Coast, Mendocino Coast
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#FranklinFire #CAwx #Malibu
3/3

Final Franklin Fire Update #17 – Normal Operations Resume from Pepperdine University
Posted on December 13, 2024, 12:20 PM

University officials continue to monitor the Franklin Fire, which poses no further threat to the Malibu campus. Fire officials have continued the process of repopulating Malibu and have reopened roads.
Normal operations on the Malibu campus are scheduled to resume for faculty and staff next week, and campus events are resuming this weekend. Please review the University events calendar for the latest updates. The air quality in Malibu is good and has returned to normal levels.

share.watchduty.org/i/39411?ts

Watch DutyWatch Duty - Wildfire Maps & AlertsReal-time information about wildfire and firefighting efforts nearby
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#FranklinFire #CAwx #Malibu
2/3

Residents returning to their homes in repopulation zones can do so with confidence that these areas have been thoroughly inspected by agencies and deemed safe. However, all residents are urged to remain cautious and follow instructions from public safety officials. For guidance on staying safe in burn areas and proper use of protective equipment, residents are encouraged to visit: publichealth.lacounty.gov/medi.

Pacific Coast Highway (PCH) is now open with traffic moving in both directions.
Remaining road closures can be found on the LA County Public Works website at pw.lacounty.gov/roadclosures/

publichealth.lacounty.govLA County Department of Public Health