Monday, April 3, 2023

Day 1 of Des Moines, IA (KDSM)

Mild but not very warm air mass in place now, with easterly winds and clouds preventing much cooldown tonight. Strong low pressure ejecting from the eastern Rockies tomorrow will push a strong warm front tomorrow afternoon, with easterly winds switching to strong southerly winds and a rapid warm-up ensuing with a last-minute high temperature helped by some afternoon sun after a cloudy morning. But models still disagree on just how fast the warm front will pass, leading to significant uncertainty in the high temperature. This will quickly be followed by a cold front tomorrow night before 06z, likely accompanied by a line or showers and thunderstorms. These storms could be severe (mostly with especially strong winds) due to the warmth, humidity, and strong wind shear, leading to a significantly higher maximum wind than the winds for the rest of the day. The Storm Prediction Center has KDSM in an enhanced risk of severe weather. However, the storms will be fast-moving and nothing suggests that they will produce particularly heavy rain, so rainfall totals should be rather light. The cold air mass will not arrive in time for a late 06z low.
 
Source: PivotalWeather
 
Source: PivotalWeather
 
Source: Meteogram Generator
 
 

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