Alert archive / California / Flash Flood Warnings in 2022

Flash Flood Warning 1, NWS Sacramento, CA

June 12, 2022Lassen County, Plumas County, California

NWS Sacramento, CA issued this flash flood warning at Jun 12, 2022, 5:12 PM PDT for Lassen County, Plumas County, California. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 12, 2022, 5:12 PM PDT (00:12 UTC)
Expired: Jun 12, 2022, 10:50 PM PDT
In force: 6 hr
Issued by: NWS Sacramento, CA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Lassen County, CA, Plumas County, CA

The radar

The Beale AFB radar (KBBX), 122 km from the middle of the area, began a volume at 00:13 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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sacramento, CA wrote its last area forecast discussion before this flash flood warning went out at Jun 12, 1:29 PM PDT, 3 hours 43 minutes earlier.

Area forecast discussion, Jun 12, 1:29 PM PDT, 3 hours 43 minutes before

Area Forecast Discussion
National Weather Service Sacramento CA
129 PM PDT Sun Jun 12 2022

.Synopsis...
Showers and thunderstorms ending this evening. Breezy north and
east winds develop early this week with low RH and elevated fire
weather concerns. Warming trend into the middle of the week. &&

.Discussion...
HRRR and High Resolution short term ensemble models did good job
with convection today in northern Sacramento Valley. Strong cell
with very heavy rain (0.50" in Red Bluff in 15 min) has since
decreased. Will still be risk of a few more organized cells
through early this evening. Upper trough that caused this activity
will be east of the area Monday. Behind it still expecting some
gusty northerly winds. No doubt where it did rain will help with
fuels but overall thinking is strength of winds and fuel status
should keep us under a critical fire weather situaiton...but
definately at least elevated concerns with lower RH and the north
winds. Winds on Tuesday should not be as bad. Wednesday upper
level ridge builds in pretty good with hot temperaures returning
in the mid to upper 90s. Very good agreement in ensembles and
clustering for this scenario.

Rasch

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)...

Ensemble in good agreement that another trough will move to west
coast by this weekend. Cooling from this will begin on Thursday.
System is pretty dry but also pretty deep for this time of the
year again. Agree with NBM solution of slight chances across the
north and higher terrain as cold pool aloft should cause some
instablity. Over impacts from it looking prety minimal though.
Perhaps biggest concern will be winds at higher elevations but
fuels still holding good in those area as of right now.  Rasch
&&

.AVIATION...

VFR conditions next 24 hours, except local MVFR conditions
vicinity scattered showers northern Sacramento Valley and
surrounding mountains thru 04Z Monday (isolated thunderstorms
possible until 02Z). Areas southwest surface wind gusts 15-30
kts through 06Z, then becoming northerly.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

In the hours before

Special weather statement, Jun 12, 11:28 AM PDT, 5 hours 44 minutes before

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Special weather statement, Jun 12, 3:16 PM PDT, 1 hour 56 minutes before

Special Weather Statement
National Weather Service Sacramento CA
316 PM PDT Sun Jun 12 2022

CAZ066-068-122300-
Northeast Foothills/Sacramento Valley CA-
Western Plumas County/Lassen Park CA-
316 PM PDT Sun Jun 12 2022

...A strong thunderstorm will impact portions of northwestern Plumas
and east central Tehama Counties through 400 PM PDT...

At 316 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles south of Mineral, moving northeast at 25 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Chester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4039 12130 4039 12125 4028 12117 4010 12162
      4023 12173 4038 12134
TIME...MOT...LOC 2216Z 243DEG 29KT 4024 12151

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

CS

Nearby

Flash Flood Warnings in California, 2022 Every flash flood warning in 2022

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.