Heat and humidity will be on the rise starting today and lasting into the weekend with heat index values forecast to reach dangerous levels on Saturday and Sunday. Interestingly, winds will be quite strong both days as well, which is somewhat of a rare combination as shown the the featured chart. The chart presents the daily observed frequencies for Des Moines of having a max heat index reading of at least 100°F (red line), a daily max wind gust of at least 30 MPH (green line), and the combined combination of the two on the same day (black line). The combined frequencies are all less than 5% and any non-zero values are just a few percentage points. Having such a combination in mid June is certainly helped by higher observed wind frequencies than during the largest heat index frequencies during July and August.