701
AGUS74 KWCO 221525
HMDNWC

National Hydrologic Discussion - EXPERIMENTAL
NWS National Water Center - Tuscaloosa AL
1015 AM CDT TUE APR 22 2025

.Synopsis...
Heavy rainfall across the Southern and Central Plains into the Mississippi
Valley...Flash flooding possible in Hawaii... River flooding continues in
the Lower Ohio and Mississippi Valleys...

.Discussion...

.Southern and Central Plains into the Mississippi Valley...
Multiple rounds of rainfall will impact areas of TX, OK, KS and the
Mississippi Valley through the week bringing the potential for flash and
small stream flooding. Rainfall totals of 1 - 3" are forecast with the
possibility of locally higher amounts (WPC). Top layer soils are wet (55 -
80%, 0 - 10 cm RSM, NASA SPoRT) with streamflows running much above normal
in areas of northern TX, eastern OK, southeast KS and MO (USGS). These
areas are most vulnerable to new flooding and will need to be monitored
given recent rainfall in the same regions from widespread totals of 2 - 4"
from the past 72 hours. With soils only becoming more saturated, any
additional rainfall in those areas may be converted to runoff and enter
area streams and urban drainage systems that may already be at or exceeding
capacity. Any intense rainfall rates and these conditions will allow for
the possibility of flash and small stream flooding.

While there still seems to be some uncertainty regarding magnitude and
areal coverage of impacts through the week, any repeated rainfall over
already saturated soils will likely cause flooding concerns.

Hawaii...
Heavy rainfall may bring the potential for flash flooding through day 2
(Wed) for portions of Kauai and Niihau.

.Lower Ohio and Mississippi Valleys...
Minor, moderate, and isolated major river flooding continues in the Lower
Ohio Valley to Lower Mississippi Valley Basins as a result of the recent
historic rainfall. While most of the rivers and their tributaries have
reached crest, lower portions of the Mississippi River are forecast to
remain in flood stage through the week due to water routing downstream.

Another system brings the potential for rainfall and renewed river rises in
portions of the same area, but heaviest rainfall will likely stay west of
previously mentioned areas. Overall, impacts are ongoing and these regions
remain vulnerable to any new rainfall.

//TMK





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