Lala Impacting Hawaii; Severe Thunderstorm and Flash Flooding Risks; Excessive Heat

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorm, heavy rainfall, and flash flooding threats continue from the Midwest to the Mid-Atlantic and across the central High Plains. Record heat continues for areas of the central/southern Plain into the Southeast 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

LBF RSS Feed

Lala Impacting Hawaii; Severe Thunderstorm and Flash Flooding Risks; Excessive Heat

Lewellen River Flood Category Changes - Effective August 28, 2019