Between a long drought, a severe heat wave last summer and heavy rains this winter, California's avocado supply isn't looking good this year, which means your avocado toast and guacamole is about to get even more expensive."We lost fruit that would have sized up to be this year's crop," Jan DeLyser, vice president of marketing for the California Avocado Commission, a trade group for avocado growers, told the Los Angeles Times.You might have already noticed the cost of avocados jump at the grocery store. According to the U.S. Department of Agriculture, the average avocado price nationally last week was $1.25, a significant jump from $1.14 last year and 94 cents in May 2016.While California is the leading avocado producer in the U.S., most avocados sold here are grown in Mexico. However, farmers there "are also suffering in a similar fashion and are sending fewer boxes to the border," according to Produce Express, a produce supplier in California.So how bad is this shortage?In the week that ended of August 6, California's avocado reached 3.74 million pounds, which is only a third of the 10.7 million pounds the state produced during the same week last year, according to the Hass Avocado Board. The California Avocado Commission predicts that the state's production will be down 46 percent from 401 million pounds in 2016 to just 215 million pounds this year.The shortage couldn't come at a worse time, considering how popular avocados have become in the last few years. "When supply is tight and demand is good, prices are going to be impacted," DeLyser told the Los Angeles Times. "That's the situation we're in right now."