When on-site meteorologist Herbert Stevens informed Merion's Matt Shaffer that this impending morning storm may be a half inch or an inch, Shaffer sounded optimistic and relieved.
"Anything less than 2 and we're golden," Shaffer said minutes ago.
The storm, which could pose issues for the U.S. Open that started 90 minutes ago, should be "an hour event," according to Stevens, who worked at The Weather Channel in its inception in 1982. Another wave, though, that could be severe in nature is expected to hit this afternoon. There already are reports of lightning are less than 30 miles away.
"If it goes through Ardmore, we have risk of severe weather that lasts an hour," Stevens says. "If it goes south, it could last three or four hours."