Denver is bracing for a significant weather event as heavy rain and thunderstorms are forecasted to impact the area on April 20. The National Weather Service predicts rainfall amounts ranging from 1 to 2 inches, with localized areas potentially experiencing higher totals. Thunderstorms are anticipated to develop in the afternoon, bringing the threat of strong winds and lightning. The weather system is moving in from the west and is expected to affect the region throughout the day, with the heaviest precipitation occurring in the late afternoon and evening hours.