At around the same time, an intense thunderstorm had developed over northern Michigan in Exeter, Ontario radar, and a textbook-style hook echo soon appeared on reflectivity images too ( see image to left ).
12.
The " rear flank downdraft ", or RFD, carries precipitation counterclockwise around the north and northwest side of the updraft base, producing a " hook echo " that indicates the presence of a mesocyclone.
13.
After the implementation of the polarization radar, being implemented to the US NEXRAD network, may provide enhanced warning of tornadoes and severe winds and hail associated with the hook echo due to distinct precipitation drop characteristics.
14.
Upon making landfall Danielle produced an estimated storm tide of 2 to 3 feet ( . 6 to . 9 m ) in Salisbury, the storm produced a possible hook echo, though no tornadoes were reported.
15.
During the tornadogenesis phase in supercells, the parcels of air that enter the tornado or incipient tornado regularly seem to pass through the hook echo and RFD, which can serve as the basis for Fujita's " recycling hypothesis ".
16.
The use of Doppler weather radar systems, such as NEXRAD, allows for the detection of strong, low-level mesocyclones that produce tornadoes even when the hook echo is not present and also grant greater certainty when a hook echo is present.
17.
The use of Doppler weather radar systems, such as NEXRAD, allows for the detection of strong, low-level mesocyclones that produce tornadoes even when the hook echo is not present and also grant greater certainty when a hook echo is present.
18.
Also, especially preceding the advent of the more advanced Doppler weather radars, by the time a hook echo could be detected a tornado had often already formed especially when the storm was far away from the location of the radar.
19.
In Iowa, several EF1 tornadoes were reported east of Peoria, other tornadoes were reported along a hook echo formation, causing heavy damage in Sangamon County, Illinois ( where the strongest tornado of the outbreak-an EF3-occurred ) and Cook County, Illinois.
20.
Using the traditional radar technology at the time ( until the installation of NEXRAD Doppler Radar ) the storm had a well defined " hook echo " meaning the radar was picking up the wrapping of the rain around the circulation of the tornado.
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