413
AGUS74 KWCO 201521
HMDNWC

National Hydrologic Discussion - EXPERIMENTAL
NWS National Water Center - Tuscaloosa AL
1015 AM CDT WED AUG 20 2025

.Synopsis...
Coastal flooding along the Eastern Seaboard will continue through the end
of the week... Ongoing and recessional river flooding in the Upper
Midwest... Monsoon activity picking up again in the Four Corners...
Multiple days of rainfall next week in the Central and Southern Plains...
Localized flash flooding possible late this week in Puerto Rico and the
USVI...

.Eastern Seaboard...
Coastal flooding from surge and heavy seas caused by Hurricane Erin is
expected along the Eastern Seaboard from the GA/SC border northward to the
eastern end of Long Island through the end of the week. Portions of
Chesapeake and Delaware Bays are expected to experience moderate to major
coastal flooding with very low potential for rain-driven urban flooding.

.Upper Midwest...
Routed flows will continue to elevate river levels on the Minnesota (MN)
and James (SD) rivers to moderate flood stage through the upcoming weekend.
Eastern Iowa tributaries to the Mississippi River will also continue to
rise as flood waves progress downstream. Further east in southern Wisconsin
and northern Illinois, streams are recovering from the past week`s heavy
rainfall with rises to action and minor flood stage through the rest of the
week.

.Four Corners and the Central and Southern Plains...
Monsoonal activity is expected to increase across much of AZ, NM, UT, and
western CO beginning on day 3 (Fri) and persisting into the first half of
next week. Localized flash flooding is possible as a result, with debris
flows also possible if heavy rainfall occurs over recently burned areas.
Multiple days of rainfall are forecast over portions of eastern CO,
northeastern NM, southern KS, the TX Panhandle, and OK over days 5 - 7 (Sun
- Tue), which could lead to at least localized flash, urban, and small
stream flooding in those areas.

.Puerto Rico and the USVI...
Localized flash flooding is possible over eastern PR and the USVI on days 3
and 4 (Fri and Sat) as a tropical wave passing to the northeast of the
islands brings moderate to heavy rainfall to those areas.

//Watson

$$