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NWS MRX SPC CONUS IWIN LSR GOES PIS SPC RECENT VDOT JS1 JS2 X L SAT
 dBZ 

 Precip
Rate 
(in/hr)
65 16+
60 8.00
55 4.00
52 2.50
47 1.25
41 0.50
36 0.25
30 0.10
20 Trace


Approximate
map scale varies..
Free Ruler Program
JRuler Software is Freeware, when using right click and select inches, when using the overlay 1 inch equals 53 miles

Rule of thumb 1 inch equals 50 miles, use landmarks to calibrate your own measurment as screen resolutions vary. Use the Distance converters below to estimate thunderstorm cell arrival times!! Other Maps have a range ring, the distance is usually listed .