WEATHER »
  • Hydrologic Outlook for Catalina Island County, California
  • Hydrologic Outlook issued March 19 at 2:32PM PDT by NWS
  • Effective: Monday, March 19, 2018 at 2:32 p.m.
  • Expires: Monday, March 19, 2018 at 4:30 p.m.
  • ...STRONG PACIFIC STORM REMAINS ON TRACK TO BRING POTENTIAL
    FLOODING CONCERNS TO SOUTHWEST CALIFORNIA TUESDAY THROUGH THURSDAY
    NIGHT...
    A strong storm system originating from the Pacific Ocean will tap
    into a long fetch of deep subtropical moisture and bring the
    potential for a very wet and long duration storm event for
    Southwest California Tuesday through Thursday night. This
    atmospheric river event will likely bring the highest rainfall
    totals to some portions of Southwest California, so far this season.
    Preliminary storm total estimates range from 5.00 and 10.00 inches
    across southwest facing foothills and mountains, and 2.00 to 6.00
    inches elsewhere.
    A prolonged period of moderate to heavy rainfall could occur with
    this system, with the highest rainfall intensities expected to occur
    sometime between late Wednesday afternoon through Thursday morning.
    Rainfall rates will likely exceed USGS thresholds and bring a threat
    of significant flash flooding and mud and debris flows to recent
    burn areas. These burn areas include the Thomas, Whittier, Creek,
    and La Tuna burn scars. Peak rainfall rates are projected to range
    between 0.50 and 0.75 inch per hour. Isolated rainfall rates as high
    as 1.00 inch per hour cannot be ruled.
    In addition to the flash flooding and mud and debris flow risk in
    recent burn areas, there will be other flooding threats in non-
    burn areas due to the long duration and intensity of this storm.
    Widespread urban roadway flooding is possible as well as
    rockslides and mudslides, especially near canyon roadways. As a
    result, there could be significant travel delays and road closures
    across the region between Tuesday and Thursday night. Creeks and
    small streams could also be running and it is always advised to
    remain out of arroyos and barrancas.
    As we draw closer to this event, Flash Flood Watches will likely
    need to be issued, especially for the recent burn areas. Pay
    close attention to the latest forecasts and updates on this storm
    system. Please follow instructions from your local emergency
    officials.

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