River Flood Warning 1, NWS San Francisco Bay Area, CA

Issued

Oct 24, 2021, 1:35 PM PDT (20:35 UTC)

In effect from

Oct 24, 2021, 2:00 PM PDT

Expired

Oct 24, 2021, 7:56 PM PDT

In force

6 hr

Issued by

NWS San Francisco Bay Area, CA

Area

Storm-based polygon

Flood severity

Minor

County Napa County, CA

The Sacramento radar (KDAX), 76 km from the middle of the area, began a volume at 20:38 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.

Written for the forecast point Napa River near St. Helena (SHEC1). The gauge peaked at 16.67 ft at Oct 24, 2021, 2:00 PM PDT.

Action stage

16 ft

Minor stage

18 ft

Moderate stage

20 ft

Major stage

22 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 11456000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

133 
WGUS46 KMTR 242035
FLWMTR

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service San Francisco CA
135 PM PDT Sun Oct 24 2021

...The National Weather Service in San Francisco CA has issued a 
Flood Warning for the following rivers in California...

  Napa River near St Helena affecting Napa County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued this evening at 800 PM PDT.

&&


CAC055-250300-
/O.NEW.KMTR.FL.W.0001.211024T2100Z-211025T0300Z/
/SHEC1.1.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
135 PM PDT Sun Oct 24 2021

The National Weather Service in San Francisco has issued a

* Flood Warning for
  the Napa River near St Helena.
* Until this evening.
* At 1:15 PM PDT Sunday the stage was 16.1 feet.
* Flood stage is 18.0 feet.
* Minor flooding is currently forecast.
* Forecast...The river is expected to rise to a crest of 16.7 feet 
  this evening.
* Impact...At 16.0 feet, Monitor Stage.  WFO Monterey may issue a 
  Flood Watch-based products to cover Napa Valley regional flood 
  potential at this stage.
* Flood History...This crest compares to a previous crest of 16.8 
  feet on 03/13/1983.

&&


          Fld   Observed           Forecasts (2 pm PDT)     
Location  Stg   Stg   Day/Time     Mon   Tue   Wed          

Napa River
St Helena 18.0  16.1  Sun 1 pm PDT 5.1   2.6   2.0          





&&

LAT...LON 3860 12265 3865 12262 3849 12239 3843 12244
      3852 12253

$$

MTR

423 
WGUS86 KMTR 250256
FLSMTR

Flood Statement
National Weather Service San Francisco CA
756 PM PDT Sun Oct 24 2021

...The Flood Warning is cancelled for the following rivers in 
California...

  Napa River near St Helena affecting Napa County.

CAC055-250400-
/O.CAN.KMTR.FL.W.0001.000000T0000Z-211025T0256Z/
/SHEC1.1.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
756 PM PDT Sun Oct 24 2021

...The Flood Warning for the Napa River near St Helena has been 
cancelled...

The Flood Warning is cancelled for
  the Napa River near St Helena.
* The Napa River at St. Helena peaked at 16.82 feet at 2:30 pm this 
  afternoon. The river dropped below monitor stage of 16 feet 
  shortly after 4:30 pm this afternoon. At 7:45 PM PDT Sunday the 
  stage was 14.47 feet and continuing to recede.
* Flood stage is 18.0 feet.
  Monitor stage is 16.0 feet.
* Forecast...The river is expected to recede through tonight.

&&


            Fld   Observed               Forecasts (8 pm PDT)     
Location    Stg   Stg   Day/Time         Mon   Tue   Wed          

Napa River
St Helena  18.0  14.47  Sun 745 pm PDT   3.6   2.1   1.8          





&&

LAT...LON 3860 12265 3865 12262 3849 12239 3843 12244
      3852 12253

$$

MTR

River Flood Warnings in California, 2021Every river flood warning in 2021

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; the gauge from the NWS water service and the USGS.