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Lala Approaching Hawaii; Flash Flooding Risks; Excessive Heat

Lala, may become a hurricane, is expected to impact Hawaii this weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians continues, with the threat shifting toward the mid-Atlantic later this weekend. Record heat continues for areas of the South. Read More >

Overview

A very slow moving and stacked low pressure system pushed over the Dakotas late Friday, August 4th through Sunday, August 6th as it continued its track southeast. This low had an abundance of moisture as weather models' Precipitable Water (PWAT) values indicated nearly two inches of moisture in the atmosphere, supporting the threat for heavy rain. Surface dew point values were well in the mid to upper 60s to lower 70s during this time frame as well, making it very humid. The result was widespread rainfall that occurred over the forecast area, which was very welcoming and much needed! Rainfall amounts ranged from an inch in Clark, SD to over nine inches near Rockham, SD! There was some minor flooding with reports of secondary roads under water in Hand and Spink Counties. 


48 hour precipitation accumulation estimates. August 4th-August 6th, 2023
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