Monsoonal Storm Activity

An Alert RivCo message was sent at 3:05 p.m. on 9/4/2019 to residents in the Hurkey Creek, Apple Canyon, Fleming Ranch and Lake Hemet areas.

As of today, September 4, thunderstorm activity is anticipated over areas of Riverside County today. Residents in the above areas are at risk of intense rain, flooding, high winds and possible debris flows. Debris flows are deadly, fast-moving landslides. There is also a risk of flooding, mudflow, rock fall and other landslides during and immediately after rain. Now is the time to get ready for future evacuations. Arrange transportation, fuel your cars, gather items to take and make plans for your animals.


Be sure to monitor weather forecasts and please obey potential evacuation warnings or orders. Even if you are not evacuated, your home could still be impacted, especially if you live close to hillsides burned in the fire. Use caution on roads as conditions may change rapidly. Do not attempt to cross flooded roadways and NEVER touch downed powerlines.




Mensaje de Alert RivCo fue enviado at las 3:05 p.m. en 9/4/2019 a residentes de Hurkey Creek, Apple Canyon, Fleming Ranch and Lake Hemet.

A partir de hoy, Septiembre 4, se espera lluvia en las areas afectadas por Incendio Cranston. Si recibio este mensaje, esta en riesgo de flujo de escombros. Lluvias intensas puedan causar flujo de escombro y pueden ser peligrosas. Hoy es el mejor tiempo para prepararse para la posibilidad de desalojar.


Organice el transporte, ponga gasolina en sus automóviles, reúna artículos para llevar y haga planes para sus animales.

Escuche y observe prognostico del tiempo y por favor obedecer las ordenes de desalojo.


The shaded areas on the map below indicate areas related to the above Alert RivCo notification. Las areas oscuras en el mapa indican ares de notificacion.


Some communities in Riverside County feature characteristics such as unique topography or limited evacuation routes. In some of these communities Public Safety officials utilize zones to alert residents of emergencies and to conduct evacuations. By knowing your zone you will be able to quickly react when evacuations are called for. These zones may be used for a number of emergencies but are primerily used for fires and storms/flooding. Zones may be subdivided depending on the emergency and conditions to lessen the impacts on a community so that only those in danger are evacuated or notified.


Click on the map below on the left, to see zones in the Temescal Valley/Lake Elsinore area. Click on the map below on the right, to see zones in Riverside County mountain communities.


When dangerous conditions approach, these risk maps will show areas under evacuation warnings and orders:


During evacuation warnings and orders, you should leave immediately and seek shelter outside all evacuation zones.


If you are told to evacuate but you stay, you are risking your life. If you do not evacuate when evacuations are called for you could be isolated and trapped without help for many days, with roads impassible and utilities disrupted or destroyed.


  • BLUE areas of the map indicate areas that are at risk for flooding, mud and debris flows. Impacts to these areas may include roads that may become impassible and deadly, as well as disrupted or destroyed utilities.
  • YELLOW means a zone is currently under evacuation warning -- you SHOULD GO NOW as this is the safest time to evacuate.
  • RED means a zone is currently under an evacuation order -- you MUST GO NOW. Your life is in immediate danger.

Temescal/Elsinore Valley Evacuation Zones

Image of the Holy Fire zone map. This image is a clickable link that will take viewers to the actual interactive map, where they can enter their address to determine which zone they live in.

Click the image above to view interactive map, which was updated on 7/26/19 at 8 a.m.

Mountain Communities Evacuation Zones

Image of the Cranston Fire zone map. This image is a clickable link that will take viewers to the actual interactive map, where they can enter their address to determine which zone they live in.

Click the image above to view interactive map, which was updated on 7/26/19 at 9 a.m.

Community Letters

Community letters and other information are being distributed to impacted residents for both the Holy and Cranston At-Risk Areas. If you received a letter, check the risk map to see if you live in the risk area. If you live in the risk area and did not receive a letter, see below.

Updated Holy Flood Ready Community Letter
Updated Holy Flood Ready Community Letter - Spanish


Holy Flood Ready Community Letter
Holy Flood Ready Community Letter - Spanish
Cranston Flood Ready Community Letter

Get Ready, Should Go, Must Go Evacuation Timeline
Get Ready, Should Go, Must Go Evacuation Timeline - Spanish

FEMA Flood After Fire Fact Sheet
Flood After Fire Infographic

Holy Community Meetings

Holy Flood Ready community meetings are planned for the following dates and times. County of Riverside and City of Lake Elsinore agencies and partners will discuss hazardous conditions and the safety steps everyone must take to prepare. Click here for the flier. Click here for the flier in Spanish.

Wednesday, Oct. 10 at 6 p.m.
Trilogy Lodge
24503 Trilogy Parkway
Temescal Valley, CA 92883
Click here to view a playback of the meeting, scroll to Oct. 10.
Flood Control
National Weather Service
Emergency Management Dept

Wednesday, Oct. 24 at 6 p.m.
Luiseño School Gym
13500 Mountain Road
Temescal Valley, CA 92883
Flood Control
National Weather Service
Emergency Management Dept

Monday, Nov. 5 at 6 p.m.
Terra Cotta Middle School Gym
29291 Lake Street
Lake Elsinore, CA 92530
All Presentations

Cranston Community Meeting

A Cranston Flash Flood community meeting was held on Monday, Aug. 27 in Idyllwild to discuss the hazardous conditions on the mountaintop. See flier.

Click here for to view a playback of the meeting, and scroll to Aug. 27.

National Weather Service
Flood Control

Community Meeting Archive

Presentations from each meeting, and playbacks from the meetings.


What is a debris flow?

Debris flows are fast-moving, deadly landslides. They are powerful mixtures of mud, rocks, boulders, trees - and sometimes homes or vehicles.

You'll often hear "debris flows" called "mudslides" or "mudflows." Many people use the terms interchangeabley, but to scientists, each is a different kind of landslide. Debris flows are the most powerful and dangerous of the three.

Read our Debris Flow Frequently Asked Questions to learn more. For a Spanish version, click here.

Safety Steps to Prepare


  • Determine if your home, business, schools or necessary travel routes are in the at-risk areas by referring to the maps above. 
  • Learn the plan for your local school. Parents of school age children should contact their school district or visit their websites to learn what steps the district will take to ensure student safety. This may include school closures and evacuations. For Corona-Norco Unified School District, click here. For Lake Elsinore Unified School District, click here.
  • Know all your local access roads and understand that some may be blocked by debris or water. Have an alternate route. Stay informed or road and highway conditions by visiting the Riverside County Transportation Department's website at and Caltrans' website at The California Highway Patrol partnered with the Idyllwild Fire Department and the Idyllwild Snow Group in producing a safety video when driving in snow and winter conditions. Please view the video here:
  •   Learn about debris flows by reading these Frequently Asked Questions. Their dangers are different than the water and mud of typical storms. Click here for Spanish Frequently Asked Questions. 
  • Flood insurance: Most homeowners insurance does not cover floods or flows from natural disasters. Make sure your home is protected. Refer to the National Flood Insurance Program website at Act now. Most flood insurance policies take up to 30 days to go into effect.
  • Have an emergency plan and a disaster kit ready to go. For more information, click here


  • Leave before any flows begin, this the only safe time to leave. If debris flows, mud or water are already flowing, get higher than the flow, such as going to the highest floor in your home. 
  • Heed all evacuations. Evacuations Warnings (Voluntary) will be issued for at-risk areas 24-48 hours before an expected storm. As stated above, the safest time to leave is before any flow begins. Mandatory Evacuation Orders will be issued 6-12 hours before the storm.
  • Monitor official weather reports and heed weather alerts. Understand that the weather where you are can be different than back in the mountains where the flows start. 
  • Never drive or walk into flood waters, mud or debris, and never go around barricades. It is impossible to know how deep the water or mud is just by looking at it and the depth can change quickly.
  • Protect your property structures with sandbags and other methods to divert water from entering structures and reduce erosion on your property. Visit to see a list of local fire station offering limited and unfilled sandbags and sand. Read the County's new Flood Guide for Homeowners to learn about protecting your home and property.
  • As always, in case of emergency, dial 9-1-1. 

Burn Assessment Reports 

A team of experts from State and Federal agencies evaluated the soil impacts after the Holy and Cranston Fires. Read the reports below to review recommendations for public agencies and property owners.



Official Sources of Information



Follow RivCoReady on Twitter and Periscope, and like us on Facebook so you don’t miss anything!