ST. LOUIS (KMOX) - Refinery outages, oil production delays, even higher gasoline prices. Experts fear all of these things may come to pass as Tropical Storm Isaac churns across the Gulf of Mexico.

Drivers have, of course, already noticed a sharp jump in prices at the pump lately.

The current St. Louis average of $3.68 per gallon for regular unleaded is more than 25 cents higher than just last month, 6-and-a-half cents higher than a week ago.

And now there is Isaac, which analyst Patrick DeHaan with the price-tracking website GasBuddy.com says could have a negative impact as well.

While maybe not as powerful as Katrina in 2005 or some other recent storms, DeHaan says at this point it seems inevitable that Isaac will at least drive up pump prices for the short term.