Upper-level high pressure will quickly rebound across the United States today, promoting widespread anomalous heat from much of the West into the southern Great Plains. High temperatures above 100°F will promote rapid drying, even in areas that experienced rainfall earlier in the week. After another morning with poor recoveries, relative humidity will drop into the single digits and teens over a broad area, lowest from central and northern Nevada to the Four Corners. Moisture recovery will be much better over the Front Range on Thursday, but another dry and hot afternoon is expected ahead of increasing thunderstorm chances. Deeper monsoonal moisture will remain limited to far southern Arizona and parts of New Mexico, West Texas, and southern Colorado, but a subtle increase in moisture appears likely over southern California. Widely scattered mixed wet/dry thunderstorms will most likely develop over the deserts and mountains of southern California and Nevada into northwest Arizona, in addition to Colorado. The Cascades will see a low risk for a few late day storms, as well. Increasing southerly flow aloft over northern California and the Oregon Cascades could bring some wind gusts of 25-35 mph during peak heating, while transport winds will increase over the Park Fire as compared to yesterday. Otherwise, winds over most of the Intermountain West will be well below critical levels as high pressure aloft expands over the region. Outflow boundaries from any thunderstorms that manage to develop could briefly enhance wind gusts, however. Winds are forecast to decrease in the Plains states, while a frontal boundary could trigger another round of thunderstorms from northeast New Mexico to southwest Kansas. Very hot and dry conditions will continue south of this front, with relative humidity as low as 15% expected over western north Texas into western Oklahoma and eastern New Mexico as high temperatures surge to near 105°F. Scattered thunderstorm clusters will continue another day from the western Great Lakes to the Appalachian states and Florida. National Predictive Services Outlook 6 Minutes for Safety: The 6 Minutes for Safety topic of the day is Thunderstorm Safety.