Severe Flood ● Closed
Flood Watch issued October 22 at 11:36AM PDT until October 23 at 5:00AM PDT by NWS Reno NV, United States of America
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* WHAT...Flooding caused by excessive rainfall is possible.
* WHERE...Northeastern Lassen County and Surprise valley in
California, and northern Washoe County and northwestern Pershing
County in Nevada. The watch area includes the Biscar and S1-Vya
burn scars.
* WHEN...Through 5 AM PDT Friday.
* IMPACTS...Small creeks and streams may flood rural roads. Increased
sediment transport from burn scars may clog culverts and ditches.
* ADDITIONAL DETAILS...
- Storm total rainfall of 0.5 to 1.5 inches, locally 2 inches or
more, is possible through through early Friday. Heavier rain this
afternoon and evening may briefly exceed 0.5 inch per hour.
Runoff may linger overnight.
- Vulnerable locations include remote ranches within and near the
Biscar and S1-Vya burn scars, downstream drainages, and culverts
along US-395 from Stoney Creek Road north to Rye Patch Road.
- http://www.weather.gov/safety/flood
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Surprise Valley California; Lassen-Eastern Plumas-Eastern Sierra Counties; Western Nevada Basin and Range including Pyramid Lake; Northern Washoe County |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-10-23T05:00:00-07:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportThis event as JSON · API and licence
Source updated 11 days ago (Oct 22, 2026 18:37 UTC) · we last heard from WMO Alert Hub (national weather services) 42 seconds ago
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About this location
The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.
Area as the agency stated it: Surprise Valley California; Lassen-Eastern Plumas-Eastern Sierra Counties; Western Nevada Basin and Range including Pyramid Lake; Northern Washoe County
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Flood preparation, evacuation decisions, and the dangers of driving or walking through floodwater.
Open Flood Safety Guide →Earlier flood events in United States
Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.
Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.