Debris and Mudflow Potential Forecast

Please note this Debris and Mudflow Potential Forecast applies to those communities for which Mudflow Phase Maps have been prepared. Other rural and canyon roads below burn areas may be impacted by any significant storm event.
Last Updated: 09/19/2024 04:57 PM
Forecast Duration: Fri. 09/20/2024 from 10:00 AM to 10:00 PM
Fire Map Reference Date of Fire Affected Areas Mudflow Forecast Phase Level
Bridge Fire
Recovery: 0 year
Sep 2024 Community of Big Pines and San Gabriel River at East Fork area in LA County, Communities of Wrightwood and Mt. Baldy Village. Phase 1
Owen Fire
Recovery: 1 year
Jul 2023 Topanga Canyon Area Phase 1
Agua Fire
Recovery: 1 year
Jul 2023 Agua Dulce Area Phase 1
Land Fire
Recovery: 2 years
Sep 2022 La Tuna Canyon Area (City of LA) No Phase
Fish Fire
Recovery: 2 years
Jun 2022 City of Duarte No Phase
Grandview Fire
Recovery: 3 years
Oct 2020 City of Glendale No Phase
Ranch2
Recovery: 4 years
Sep 2020 Mountain Cove Community - City of Azusa No Phase
Bobcat Fire
Recovery: 4 years
Sep 2020 City of Monrovia No Phase
Bobcat Fire
Recovery: 4 years
Sep 2020 Juniper Hills, Devil's Punchbowl, Valyermo Area No Phase
Lake Fire
Recovery: 4 years
Aug 2020 Lake Hughes No Phase
Tujunga Fire
Recovery: 4 years
Jul 2020 Sunland-Tujunga No Phase
Soledad Fire
Recovery: 4 years
Jul 2020 Agua Dulce No Phase

GENERAL NOTES

The debris and mudflow potential forecast is based upon a review of watershed conditions and weather forecasts from the National Weather Service and other weather predicting sources. It represents conditions within the watershed that could lead to debris and mudflow events. Debris and mudflows are highly unpredictable events. The following description is to assist storm response Divisions and emergency response agencies to plan accordingly:

No Phase

    Rain is forecast by the National Weather Service, but the amount of rain and/or watershed conditions are not anticipated to produce appreciable amounts of debris on streets or specific public infrastructure locations. Reports of debris on private property may be received by emergency response entities. Few, if any, structures are anticipated to be endangered, other than those advised to be prepared to evacuate with any forecast of rain.

Phase 1

  • Small isolated debris and mudflows possible at specific public infrastructure locations. Streets may be flooded or blocked by debris. Reports of debris on private property may be received by emergency response entities. A few structures may be endangered, in addition to those advised to be prepared to evacuate with any forecast of rain.

Phase 2

  • Moderate debris and mudflows possible at more widespread locations. Some streets may be completely blocked by debris. Depending on location and terrain, some structures may be endangered, in addition to those advised to be prepared to evacuate with any forecast of rain.

Phase 3

  • The potential exists for significant debris and mudflows to be widespread over specific areas. Streets may be blocked and considered unsafe for travel. Many structures could be endangered by debris and mudflows. Extreme caution should be exercised below uncontrolled canyons due to sudden debris flows.

For questions or further information, contact (626) 458-6164, Monday through Thursday, 6:30 A.M. to 5:15 P.M. After hours, telephone (800) 675-HELP.