Alert archive / California / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 28, NWS Reno, NV

August 24, 2025Washoe County, Nevada; Lassen County, Sierra County, California

NWS Reno, NV issued this severe thunderstorm warning at Aug 24, 2025, 2:37 PM PDT for Washoe County, Nevada; Lassen County, Sierra County, California. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 24, 2025, 2:37 PM PDT (21:37 UTC)
Expired: Aug 24, 2025, 3:00 PM PDT
In force: 23 min
Issued by: NWS Reno, NV
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lassen County, CA, Sierra County, CA, Washoe County, NV

The radar

The Reno radar (KRGX), 91 km from the middle of the area, began a volume at 21:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Reno, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 24, 12:05 PM PDT, 2 hours 32 minutes earlier. Its key messages:

* Afternoon shower and thunderstorm chances continue today through mid-week, bringing frequent lightning, small hail, gusty winds, and flooding potential. * The greatest chances for flooding will take place today through Tuesday, with the highest risk for flash flooding over urban areas and burn scars such as the Davis and Connor. * A cooling trend begins today and continues through this week, dropping temperatures by 10 to 15 degrees.

Area forecast discussion, Aug 24, 12:05 PM PDT, 2 hours 32 minutes before

Area Forecast Discussion
National Weather Service Reno NV
1205 PM PDT Sun Aug 24 2025

.KEY MESSAGES...

* Afternoon shower and thunderstorm chances continue today through
  mid-week, bringing frequent lightning, small hail, gusty winds,
  and flooding potential.

* The greatest chances for flooding will take place today through
  Tuesday, with the highest risk for flash flooding over urban
  areas and burn scars such as the Davis and Connor.

* A cooling trend begins today and continues through this week,
  dropping temperatures by 10 to 15 degrees.

&&

.DISCUSSION...

Forecaster confidence in afternoon thunderstorms has decreased
this morning. The 12Z sounding recorded 0.98 inches of PWAT,
which is well above the 90th percentile based on sounding
climatology. While this looks promising for abundant rainfall
areawide today, this forecaster disagrees.

Skies earlier this morning looked promising; it looked as if the
lingering cloud cover was going to burn off as the sun rose.
However, the cloud deck only got thicker. As clouds continue to
fill in today, this will make it very challenging for discrete
storms to populate; we won't have the required daytime heating and
therefore the instability. Instead, I'm expecting for any rain
today to be more stratiform in nature. This has thus reduced the
risk for thunderstorm impacts such as small hail and gusty winds.

In areas where there is more clearing, namely in Mono and Mineral
counties, some cells are trying to populate. Like yesterday,
they'll move northward. Heavy rain out of these cells remains a
possibility, based on the amount of moisture and how storms
developed yesterday.

Monday is looking to be a better day for widespread discrete storm
coverage and the capability for producing flooding concerns.
Model PWAT values decrease back into our known sweet spot
(0.7-0.8") and the high pressure pivots back eastward. Assuming
the cloud cover today clears out enough ahead of tomorrow morning,
we could see something similar to Saturday with widespread
showers and thunderstorms and the coinciding threats. This looks
to continue to be the trend Tuesday and Wednesday as well.

Beyond Wednesday, confidence decreases. As the high moves over
Texas, a low off the PacNW starts to creep in. We will likely see
drier conditions and the possible return of wind concerns.
However, if the high or low wiggles in one way or another, that
could change. What we are confident on in the long term is that
temperatures will decrease! Highs will stay below normal through
the remainder of this week.

-Giralte

&&

.AVIATION...

Abundant monsoonal moisture continues to bring widespread
coverage of showers this afternoon. Brief periods of IFR
conditions are possible due to heavy rain and sudden reductions
to visibility. The best chances for thunderstorms today will be
around KMMH, where storms will be capable of producing 0.25-0.75"
of rain in individual storm cores, along with small hail,
lightning, and outflow gusts up to 45 kts. More stratiform-type
rain is expected for the remaining terminals.

An active thunderstorm pattern is expected to continue through
the middle of next week with better chances for widespread
thunderstorms returning Monday through Wednesday.

-Giralte/Fuentes

&&

.REV Watches/Warnings/Advisories...
NV...Flood Watch until 9 PM PDT this evening NVZ001>003-005.

CA...Flood Watch until 9 PM PDT this evening CAZ072-073.

&&

In the hours before

Special weather statement, Aug 24, 1:33 PM PDT, 1 hour 4 minutes before

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Special weather statement, Aug 24, 1:39 PM PDT, 58 minutes before

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Special weather statement, Aug 24, 1:51 PM PDT, 46 minutes before

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Special weather statement, Aug 24, 2:12 PM PDT, 25 minutes before

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Special weather statement, Aug 24, 2:17 PM PDT, 20 minutes before

Special Weather Statement
National Weather Service Reno NV
217 PM PDT Sun Aug 24 2025

CAZ071-NVZ003-242145-
Lassen-Eastern Plumas-Eastern Sierra Counties CA-Greater Reno-
Carson City-Minden Area NV-
217 PM PDT Sun Aug 24 2025

...A STRONG THUNDERSTORM WILL IMPACT PLUMAS...SIERRA...SOUTHEASTERN
LASSEN AND WASHOE COUNTIES THROUGH 245 PM PDT...

At 217 PM PDT, Doppler radar was tracking a strong thunderstorm near
Hallelujah Junction, or near Chilcoot, moving east at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Chilcoot, Chilcoot-Vinton, Hallelujah Junction, Cold Springs, Cold
Springs Valley, Ca 70 At Plumas-Lassen Co Line, Us 395 At
Calif-Nevada Line Near Bordertown, and Us 395 At Sierra-Lassen Co
Line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3970 12016 3981 12015 3984 11994 3966 11995
TIME...MOT...LOC 2117Z 277DEG 13KT 3974 12008

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

TS

Special weather statement, Aug 24, 2:34 PM PDT, 3 minutes before

Special Weather Statement
National Weather Service Reno NV
234 PM PDT Sun Aug 24 2025

CAZ071-242200-
Lassen-Eastern Plumas-Eastern Sierra Counties CA-
234 PM PDT Sun Aug 24 2025

...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL LASSEN COUNTY
THROUGH 300 PM PDT...

At 234 PM PDT, Doppler radar was tracking a strong thunderstorm 17
miles north of Standish, or 19 miles southeast of Termo, moving
southeast at 15 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This storm will remain over mainly rural areas of east central Lassen
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4058 12043 4070 12031 4064 12011 4044 12026
TIME...MOT...LOC 2134Z 309DEG 11KT 4060 12029

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

TS

The office that day

Everything else NWS Reno, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 23, 5:14 PM PDT	Dust Storm Advisory	REV	Pershing, Washoe	2 hr
Aug 24, 2:50 AM PDT	Flood Watch	REV	Douglas, Lyon, Mineral, Storey, Washoe	18 hr
Aug 24, 2:12 PM PDT	Special Weather Statement	REV		33 min
Aug 24, 2:27 PM PDT	Areal Flood Advisory	REV	Mineral	2 hr
Aug 24, 2:56 PM PDT	Special Weather Statement	REV	Mineral	19 min
Aug 24, 3:06 PM PDT	Severe Thunderstorm Warning	REV	Washoe	24 min
Aug 24, 3:13 PM PDT	Areal Flood Advisory	REV	Washoe	3 hr
Aug 24, 3:25 PM PDT	Special Weather Statement	REV	Storey	35 min
Aug 24, 3:57 PM PDT	Special Weather Statement	REV	Storey	33 min
Aug 23, 5:19 PM PDT	Special Weather Statement	REV	Lassen	26 min
Aug 24, 12:40 PM PDT	Special Weather Statement	REV	Sierra	35 min
Aug 24, 12:50 PM PDT	Special Weather Statement	REV	Plumas	25 min
Aug 24, 1:33 PM PDT	Special Weather Statement	REV	Plumas	27 min
Aug 24, 1:39 PM PDT	Special Weather Statement	REV	Lassen	36 min
Aug 24, 1:51 PM PDT	Special Weather Statement	REV	Sierra	24 min
Aug 24, 1:58 PM PDT	Severe Thunderstorm Warning	REV	Plumas	32 min
Aug 24, 2:17 PM PDT	Special Weather Statement	REV	Sierra	28 min
Aug 24, 2:28 PM PDT	Areal Flood Advisory	REV	Plumas	3 hr
Aug 24, 2:34 PM PDT	Special Weather Statement	REV	Lassen	26 min
Aug 24, 3:00 PM PDT	Special Weather Statement	REV	Plumas	30 min
Aug 24, 3:19 PM PDT	Areal Flood Advisory	REV	Lassen	3 hr

Nearby

Severe Thunderstorm Warnings in California, 2025 Severe Thunderstorm Warnings in Nevada, 2025 Every severe thunderstorm warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.