St. Paul received 3.24" of rain this week. The Twin Cities, as a whole, is now running 1.47" above average with monthly rainfall. The singletrack gets a well-earned break. Low humidity and seasonal conditions make for good mountain biking weather through the weekend.
Radar could light up again next week with heavy rain-producing thunderstorms. Humidity levels begin to increase across the area but the core of highest heat remains just south of Minnesota. While this heat bubble remains over the Central Plains it puts Minnesota in a perfect position for large clusters of thunderstorms that could routinely migrate over the Upper Midwest.
On a recent mountain biking trip to the CAMBA trails overnight thunderstorms erupted producing a tremendous amount of lightning. The afternoon prior to these t-storms was hot (90s) and very humid. As it turns out the frequency of lightning from nighttime t-storms depends on the heat from the previous afternoon. As the Capital Weather Gang severe weather expert Jeff Halverson explains:
“When the atmosphere heats up so much during day, instability persists through the late night hours,” Halverson said. “The atmosphere is like a capacitor. When you charge it up with buoyant energy to such a great degree, that energy is still available after sunset to power these thunderstorms. It fuels strong updrafts that can create very concentrated and intense bursts of lightning in these storms.”
During the summer months Minnesota (and the Midwest in general) tends to receive the majority of the season's rainfall from these overnight thunderstorms.
Rainfall Forecast Tuesday-Thursday
Summer brings warm afternoons perfect for biking, but the summer heat and humidity can also spark thunderstorms and severe weather. Be prepared for any type of adverse weather headed your way with Aeris Pulse.
NWS Twin Cities Weather Story