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Estimating Charts

Hail Size Estimates
Pea.25 inchesPenny.75 inches
Quarter1.00 inchHalf Dollar1.25 inches
Golf ball1.75 inchesTennis Ball2.50 inches
Baseball2.75 inchesGrapefruit4.00 inches

Wind Speed Estimates
Speed (MPH)Effects
25-31Large branches in motion; whistling in telephone wires
32-38Whole trees in motion
39-54Twigs break off of trees; wind impedes walking
55-72Damage to chimneys and TV antennas; pushes over shallow rooted trees
73-112Peels surface off roofs; windows broken; trailer houses overturned
113+ Roofs torn off houses; weak buildings and trailer houses destroyed; large trees uprooted

Fujita Damage Scale
F0Gale Tornado weak 40-72 mph
F1Moderate Tornado weak 73-112 mph
F2Significant Tornado strong 113-157 mph
F3Severe Tornado strong 158-206 mph
F4Devastating Tornado violent 207-318 mph
F5Incredible Tornado violent 261-318 mph

Weather Links


  Hancock SkyWarn Home
  Current Doppler Radar
  Estimating Charts
  Hurricane Watch Net
  MetEd - SkyWarn training
  Local Warnings/Watches
  NWS Pittsburgh, PA Products
  On-Line Spotter Report
  S.A.M.E. Alerting
  Skywarn Recognition Day

  Reporting Criteria

  Cold Weather Season
  Warm Weather Season

  Forms and Pamphlets

  Basic Spotter Guide
  Advanced Spotter Guide
  Facts about Lightning
  Heat Wave
  NOAA Weather Radio
  NOAA Weather Radio 2

  Owlie Owl Weather
  Coloring Books


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