concerns about the power grid led to calls for moderation in using electricity. the unrelenting heat is also buckling roads and forcing amtrak to impose speed restrictions on train lines. animals are at risk as well. when dairy cows are hot, they produce less milk. farmers in western wisconsin are using computer sensors in barns to monitor heat and humidity. cooling systems are set up to keep the herds out of danger. output can drop during heat waves, causing shortages of milk. the heat wave is going from bad to worse today with temperatures nearing 100 degrees again in many places. >> let's get the latest from accuweather. meteorologist andrew baglini is standing by. good morning, andrew. >> thank you. good morning, john and diane. snoer scorcher ahead of us today. i think it's going to be the worst of the week so far. the temperatures in the 90s. heat advisories from washington, d.c. to portland. extensive heat warnings in philadelphia, new york city. the heat advisories from cleveland all the way to minneapolis, minnesota and