Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

A cold front will cross the Great Lakes and Northeast U.S. through Monday with gusty winds and areas of rain showers. A strong atmospheric river is expected to move into the Pacific Northwest by midweek bringing a threat for moderate to heavy rainfall, gusty winds, and mountain snows for parts of Washington, Oregon, northern California, and the Sierra Nevada. Read More >

Effective August 28, 2019, the National Weather Service (NWS) in North Platte, NE will change the flood category stages for the North Platte River at Lewellen (LEWN1).

All NWS flood warnings, flood statements, flood advisories, flood watches, probability outlooks, and NWS hydrographs on the Advanced Hydrologic Prediction Service (AHPS) will reference the new category levels. This change is part of a recent evaluation of the levels based on high water, flood events, and impacts over the past 10 years.

The new flood categories will be as follows (all values at level above gage zero datum) at the North Platte River at Lewellen:

New Flood Categories	Previous Flood Categories
Action Stage: 7.0 ft	Action Stage: 6.5 ft
Flood Stage: 8.0 ft	Flood Stage: 7.5 ft
Moderate Flood Stage: 9.0 ft	Moderate Flood Stage: 8.5 ft
Major Flood Stage: 10.0 ft	Major Flood Stage: 9.5 ft
Gage zero datum: 3286.992 ft above MSL NAVD88

The National Weather Service welcomes public feedback. If you have any questions or comments on this change, please contact:

Kenneth Roberg
Lead Forecaster/Hydrology Focal Point
(308) 532-4936
kenneth.roberg@noaa.gov

National Weather Service
5250 East Lee Bird Dr
North Platte, NE 69101

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Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

Lewellen River Flood Category Changes - Effective August 28, 2019