Many people believe a large acorn crop is a predictor of a harsh winter. The truth is, the acorns on the ground today are the prediction of weather conditions two or three years ago.
Bucknell University Professor of Biology Emeritus Warren G. Abrahamson, Ph.D and Executive Director of the Archbold Biological Station (located in Venus, Fla.) James N. Layne, Ph.D worked together on a study of acorn production during the years of 1969-1996 (with the exception of 1991).
The pair observed and recorded the acorn crops of two white oak and three red oak species.
"Jim Layne was really the one who got the project started," said Abrahamson. "He also was the one to make sure the data got collected each year."
The findings of the team may surprise you. In a published report dated September 2003, the research showed that the volume of acorn production each year is partly controlled by external factors like precipitation affecting the acorns during different stages of development during prior years.
Acorn production from bud to completed acorn takes nearly two years for species of the white oak and three years for species of the red/black oak, according to Abrahamson.
In 1989, the oaks in the study were subject to a freeze during the growth cycle. Only one species of oak, the Chapman Oak, was damaged. The damaged trees produced their third highest crop of acorns over the entire 27 year of the study in 1990.
The team reported that they did not experience a complete crop failure of any oak species during the study.
If you've noticed a lot of acorns around your house, Abrahamson who resides in Central Pennsylvania, said the Chestnut Oaks are producing them.
"I have never seen such a large crop in the 30 years I've lived here," he said. "Walking around my property is like walking on marbles."
The rainfall and temperatures in Central Pennsylvania during the springs of 2010-2012 have been favorable for acorn production. The table below list the precipitation and temperature totals for the months of March-May for each of the three years.
|Year||Avg. Precip.||Actual Precip.||Percent of Normal||Temp. Percent Above Norm.|
If favorable weather conditions for acorns mean a bumper crop two or three years later, the crops of 2013-2015 may bring some of the largest crops yet.
"Weather was a very important factor in the study," said Abrahamson. "The production of acorns definitely is not forecasting but hindcasting the weather."
The tropics have been quite active around Hawaii as of late, and the pattern is not expected to change anytime soon with Hurricane Ignacio churning in the eastern Pacific.
Erica will bring torrential rain, flash flooding, mudslides and gusty winds to many of the northern islands of the Caribbean prior to taking a turn toward the Bahamas and Florida this weekend.
As many as seven tropical cyclones were churning throughout the world this past week, while smoke from wildfires across the Pacific Northwest led to poor air quality across the region.
Heat will linger in Eastern Europe for much of the fall season; meanwhile, the British Isles and northwestern Europe can expect a stormy end to the season.
As Hurricane Katrina barreled towards the Gulf Coast, peaking at Category 5 strength while feasting on the warm waters of the Gulf of Mexico, meteorologists around the country prepared to deliver one of the most crucial and life-saving forecasts in history.
Cleveland-based pseudonymous photographer Seph Lawless ventured to New Orleans in July of 2015 to tell the story of a still-recovering city 10 years post-Katrina.
A five-state tornado outbreak in Nebraska, Kansas, Wyoming, Iowa and Missouri occurred on this date. In all, 20 tornadoes were reported. Nine were in Iowa. One near Farragut, IA, in the extreme SW corner of the state, caused several fatalities and numerous injuries.
Sherman Pass, WA (1980)
2 inches of snow.
Pennsylvania & New Jersey (1971)
Tropical Storm Doria caused severe floods in southeastern PA and NJ. Damage estimated at $138 million.