St. Louis woke up Monday to thick clouds, muggy air and temperatures near 75°F, with a southerly breeze around 10 mph adding to the sticky feel. A few spotty showers are already drifting through the metro, but the main concern arrives later when storms become more widespread late in the morning and into the early afternoon.
Late Morning Into Early Afternoon
Showers and thunderstorms are expected to ramp up late Monday morning and will be most likely between about 10 a.m. and 1 p.m., with a high near 85°F. Some of these storms could feature heavy, training downpours that may trigger flash flooding. A couple of storms, mainly across southwestern Illinois and southeastern Missouri, could also produce damaging wind gusts or a brief tornado. According to NWS St. Louis, a Flood Watch is in effect for the city and many neighboring counties, so keep an eye on the radar and build in extra time if you need to be on the road.
Flash Flooding Risk And Commute Impacts
Slow-moving storms may unload intense rain in short bursts, leading to flooded intersections, overwhelmed storm drains and standing water on side streets. Commuters should avoid flooded roadways, leave earlier for trips, and never drive through deep water, instead turn around and seek higher ground. For practical tips on sheltering and road safety during floods, see the NWS flood safety guide.
Heat Returns Later This Week
Once the storms move out, temperatures will jump quickly Tuesday through Thursday, with highs in the low to mid 90s and heat index values often at or above 100°F. Forecasters note that heat index readings could reach the low to mid 100s by midweek, so it is wise to scale back outdoor exertion during peak afternoon hours and check for any Heat Advisories. Spotty storm chances will linger into the week, so keep checking for updates before making outdoor plans.
