545
AGUS74 KWCO 221515
HMDNWC

National Hydrologic Discussion - EXPERIMENTAL
NWS National Water Center - Tuscaloosa AL
1015 AM CDT FRI AUG 22 2025

.Synopsis...
Coastal flooding along the Eastern Seaboard will continue through early
tomorrow... Isolated flooding possible through tomorrow in portions of the
Southeast... Monsoon activity picks up next week in the Four Corners and
the Intermountain West... Multiple days of rainfall next week, flooding
possible in portions of the Central and Southern Plains... Flash flooding
possible today across American Samoa... Localized flash flooding possible
through tomorrow in Puerto Rico...

.Eastern Seaboard...
Coastal flooding from surge and heavy seas caused by Hurricane Erin is
expected from the Outer Banks of NC northward to the central NJ coast
through early on day 2 (Sat). Portions of Chesapeake and Delaware Bays are
expected to experience moderate to isolated major coastal flooding.

.Southeast...
Isolated flash and urban flooding is possible across portions of
southeastern GA and southern SC through late on day 2 (Sat) as 2 - 4" of
rainfall is expected with locally higher amounts possible. While river
flooding is not forecast, rises to action stage are expected and rises to
minor flood stage cannot be ruled out.

.Four Corners and the Intermountain West...
Localized flash flooding is expected with an increase in monsoonal activity
across AZ, UT, NV, and western portions of NM and CO beginning today and
continuing through the weekend. The highest threat areas through the
weekend, due to higher forecast rainfall amounts than surrounding areas,
includes much of AZ and northwestern NM on day 2 (Sat) and portions of
western CO on day 3 (Sun). The threat for more widespread flash and urban
flooding, and perhaps localized small stream flooding, is expected to
increase beginning on day 4 (Mon) and persist through the middle of next
week, when rainfall coverage and intensity in the region are expected to be
at their greatest and soils gradually become wetter. Debris flows near
recently burned areas are also possible throughout the period.

.Central and Southern Plains...
Multiple days of moderate to heavy rainfall are forecast over portions of
eastern CO, northeastern NM, much of KS and OK, and the TX Panhandle over
days 3 - 7 (Sun - Thu), which could lead to at least localized flash,
urban, and small stream flooding in those areas. Portions of eastern CO and
northeastern NM are expected to receive moderate amounts of rainfall
through day 2 (Sat), which will wet soils in those areas ahead of the
heavier rainfall expected beginning on day 3 (Sun). Dry soils (NASA SPoRT)
should mitigate more widespread hydrologic responses, and confidence in
outlining more specific impacts and affected locations will increase as the
event nears in time.

.American Samoa...
Isolated flash flooding is possible across the islands today due to locally
heavy rainfall. Landslides are also possible in areas of steep terrain.

.Puerto Rico...
Localized flash flooding is possible across southern and southwestern
portions of PR today and across northwestern, northern, and eastern PR on
day 2 (Sat) as a tropical wave (Invest 90L) passes to the northeast of the
islands and brings moderate to heavy rainfall to those areas.

//Watson

$$