NWS Forecast Office Tulsa, OK

Thunderstorms increase from the west late Thursday evening and overnight. Storms may produce very heavy rainfall, and there is a marginal risk of excessive rainfall Thursday night. Localized flash flooding possible where the heaviest thunderstorms occur.

Shower and thunderstorm chances increase again Friday as another cold front pushes into the region. Instability ahead of the front will create a potential for severe storms across much of eastern Oklahoma and northwest Arkansas, with all severe hazards possible. Continue to monitor latest forecasts.

There is a marginal to slight risk for excessive rainfall and flash flooding Friday and Friday night across much of eastern Oklahoma and northwest Arkansas. Overall, 0.5-1.5" of rain is expected, with amounts exceeding 2" possible across southeast Oklahoma and northwest Arkansas, where the highest flash flood threat will reside.

An unsettled weather pattern will persist for the remainder of this week and into the early part of the weekend. Periods of both a severe weather and heavy rain threat should be expected.

Fort Smith Radar Loop.