916 

AGUS74 KWCO 291155

HMDNWC



National Hydrologic Discussion - EXPERIMENTAL

NWS National Water Center - Tuscaloosa AL

700 AM CDT MON JUN 29 2026



.Update...



The Ohio and Tennessee Valley and the North Carolina Limited Flood Threat  

areas were removed from the FHO as the heavy rainfall has moved on. While  

there remains some isolated river flooding in the Ohio Valley, there are  

only 3 gages in moderate flood or forecast to reach moderate and two of  

those are currently cresting. With that in mind, we opted to drop the  

Limited area for the region.



A Limited Flood Threat area was added for northern ND as heavy rainfall  

tonight will increase the threat for isolated flash flooding. Soils are  

generally on the drier side which will allow for some infiltration capacity  

and limit excess runoff however, there is the potential for some quick  

hitting and repeated rounds of rainfall that could overwhelm soils. The NWM  

SRF is starting to show isolated stream responses across the area for this  

afternoon and evening suggesting that the area should continue to be  

monitored.



For American Samoa, a Limited Flood Threat area was added to the FHO as a  

trough moves in Wednesday which may result in heavy rainfall to the islands.



No major changes were made to the northern Montana Limited Flood Threat  

area.



//Smith



Previous Discussion as follows



...Lingering flood impacts over the Lower Ohio and Tennessee  

Valleys...Flooding impacts from rainfall and snowmelt are continuing in  

portions of Northern Montana...Isolated flash and urban flooding over  

portions of coastal North Carolina...



.Lower Ohio and Tennessee Valleys...

Rainfall is beginning to taper off over the Lower Ohio and Tennessee  

Valleys, however flood impacts are expected to linger over the area through  

early this week as runoff continues to route downstream. Scattered minor to  

isolated moderate flooding is ongoing and forecast through early this week.  

Rainfall through the remainder of the week is expected to be very light,  

thus recessions are expected to be unimpeded.



.Northern Montana...

The Limited selection over portions of northern MT has been expanded to the  

west for the afternoon issuance. Locally heavy rainfall, combined with high  

level snowmelt, will continue to keep small streams elevated with some  

rises on larger rivers. Precipitation will begin to diminish over the  

region tonight, with streamflows generally receding unimpeded though the  

week.



.Coastal North Carolina...

Isolated flash and urban flooding will remain possible over portions of  

coastal North Carolina through tonight. Soils through the region are  

predominately dry, which should help mitigate some hydrologic responses.



//Fontenot







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