catherine maxwell volunteered to test the vaccine. >> this is going to save a lot of lives. >> reporter: the trial will determine if two shots three weeks apart will work. tracy potts, news 4. >> health officials say we are probably weeks away from knowing how bad the h1n1 virus will be this year of course because most schools have not started yet. while the swine flu is new, school closings because of the flu are not. every winter a relatively small schools close because of the regular flu outbreaks. >> well, summer is not done with us yet. erious heat coming up this t ilet'go to bob. >> it is. what an exceptional day we ha and enjoy this evening. sparkling blue sky early. got down to 55. it's only around 80. some spots in the low 50s out to our west. right now into the 80s. the hottest days, the hottest temperatures of past summers. remember a couple years ago we got up to over 100? well, i think over the weekend we may be seeing our temperature 98 degrees which would be as hot as it was last summer. a turin increase and it will feel 15 to 20 degrees hotter than it does right now. so