Downpours and water twisters follow heatwave
4 August 2006, AMSTERDAM — Meteorological bureau KNMI has warned water sports enthusiasts to be on their guard for water tornadoes over the coming days.
4 August 2006
AMSTERDAM — Meteorological bureau KNMI has warned water sports enthusiasts to be on their guard for water tornadoes over the coming days.
In principle they are not dangerous "as long as you stay out of the way," Harry Geurts of the KNMI said.
Following the two heatwaves in July, the KNMI is forecasting lots of wet and stormy weather ahead. The west and the east of the country in particular will experience extreme cloud bursts, with Zeeland province bearing the brunt.
Parts of the country were soaked by hours of heavy rain on Thursday evening and through the night.
Geurts said the heavy showers will continue, with significant local differences. Water sports enthusiasts on the IJssel Lake and in the vicinity of Harlingen, Rottum, Delfzijl and Marken will have to watch out for water tornadoes.
Water tornadoes can form when there is a major temperature difference between the water and air. "Enormous rain clouds can form when the water (temperature) rises above 20 degrees, and it is now even at 24 degrees, and a cold air flows above," he said. The strong upward current sucks water from the surface, creating a twisting funnel of water.
A lot of rain has fallen across the Netherlands in recent days. "A total of 127 millimetres of rain fell in Schoondijke (Zeeland) in the first three days of August. That is more than twice the national average of 60 millimetres for August," Geurts said.
[Copyright Expatica News 2006]
Subject: Dutch news