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AGUS74 KWCO 031250
HMDNWC

National Hydrologic Discussion - EXPERIMENTAL
NWS National Water Center - Tuscaloosa AL
700 AM CST MON NOV 3 2025

UPDATE...

The morning issuance maintains the Mariana Islands selection, with no
proposed changes. The Pacific Northwest and Northern California are
expected to experience more localized/nuisance flooding, rather than
widespread flooding concerns, so no flood threat category is needed at this
time.

//JAW

Previous Discussion as follows:

Flooding impacts possible for American Samoa and the Mariana Islands...
Isolated flooding impacts possible for the Pacific Northwest and Northern
California...

.American Samoa...
Flash flooding and landslides are possible through today as a nearby trough
brings periods of showers and thunderstorms to the islands.

.Mariana Islands...
A tropical disturbance is expected to bring heavy rainfall to the islands
starting Sunday night through at least Thursday night. Rainfall amounts of
3 - 8" are expected to produce minor flooding across the islands, with
flash flooding possible in Guam.

.Pacific Northwest and Northern California...
Moderate rainfall associated with a surge of moisture in the region will
begin falling across portions of western WA and northwestern OR starting on
Monday (day 2). There are currently no widespread flooding concerns for
this area anticipated at this time.

However, rainfall is expected to increase and spread southward becoming
more organized across northern CA and southwest OR by Tuesday (day 3). This
activity may elicit isolated urban and small stream flooding in northern CA
and southwest OR through mid-to-late week. Topsoils are also wet across the
region (NASA SPoRT) and streamflows are running above normal (USGS) in
response to recent rainfall, increasing confidence for isolated flooding
impacts.

Additional National Water Center products are available at
www.weather.gov/owp/operations

This product will begin to be issued twice daily, with new issuance times,
beginning approximately 3 November 2025. The routine primary issuance time
of the product will be at 20 UTC, with routine daily updates to the
discussion being completed around 7 AM Central Time.

//DPL

$$