Another day of warm, dry conditions will dominate the western United States today. Extreme heat is forecast for parts of southern California, the Central California Valley, western Texas and the desert Southwest, where temperatures are likely to reach 110°F or above. A low-pressure center travels slowly inland from the southern California coast towards the Southwest, bringing strong southwest winds to much of Arizona, the southern Great Basin and the Four Corners area. Sustained winds of 20-25 mph are anticipated through the afternoon. Breezy conditions are also likely to develop Oregon and Washington to the east of the Cascades. A chance exists for isolated, dry, afternoon thunderstorms to develop over the Sierra Nevada. Above normal heat is forecast for much of the Midwest and Central Great Plains through the Mississippi Valley and the middle and northern Atlantic Coast States. A band of showers and thunderstorm activity is forecast to develop in the middle Mississippi Valley, through the Ohio Valley and the lower Great Lakes Region with severe thunderstorms possible in southern Iowa and northern Missouri, while thunderstorms and heavy rain will continue in central and southern Florida where there is a potential for flooding. National Predictive Services Outlook 6 Minutes for Safety: The 6 Minutes for Safety topic of the day is Hazmat Incident Operations.