Tropical Storm Heidi -
An east-west oriented trough of low pressure extended from the Gulf of
Mexico eastward into the southwest
North Atlantic ocean for a couple weeks during September 1971.
Heidi was the fifth tropical cyclone spawned
within this trough, forming east of an upper level low. A large
extratropical cyclone formed over the northern
Appalachians, steering Heidi north across the western Atlantic into
Maine before moving northeast into Canada
as an extratropical low. Below is the storm total rainfall
graphic and track relating to Heidi. Rainfall data was
provided by the National Climatic Data Center in Asheville, North
Carolina. Note that most
of the rain fell
near the extratropical cyclone (a predecesor rainfall event, or PRE)
which used Heidi as a source of moisture.