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NWS Weather Spotting Guidelines

IMPORTANT! Please listen to the Net Control Station. Be sure you report only the information that is being requested!

NWS Reporting Priorities

  1. Tornado, funnel, low level rotation, flash flooding that endangers life.
  2. Golf ball or larger hail, 70+ mph straight line winds, strong updraft.
  3. Dime-golf ball size hail, 50-70 mph winds
    4.
  4. Smaller than dime size hail

    5. Note: Rainfall rates are no longer considered part of the minimum reporting criteria.

Estimating Wind Speeds

<
Wind Speed (mph) Effect
< 1 CALM: SMOKE RISES VERTICALLY
1 - 3 DIRECTION OF WIND SHOWN BY SMOKE DRIFT BUT NOT BY WIND VANE
4 - 7 WIND FELT ON FACE; LEAVES RUSTLE; ORDINARY VANE MOVED BY WIND
9 - 12 MOTION; WIND EXTENDS LIGHT FLAG. LEAVES AND SMALL TWIGS MOVED
13 - 18 RAISES DUST; LOOSE PAPER; SMALL BRANCHES ARE MOVED
19 - 24 SMALL TREES IN LEAF BEGIN TO SWAY; CRESTED WAVELETS FORM ON INLAND WATER
25 - 31 LARGE BRANCHES IN MOTION; WHISTLING HEARD IN TELEPHONE WIRES; UMBRELLAS USED WITH DIFFICULTY.
32 - 38 WHOLE TREES IN MOTION; INCONVENIENCE FELT WALKING AGAINST WIND
39 - 54 TWIGS BREAK OFF TREES; WIND GENERALLY IMPEDES PROGRESS
55 - 72 DAMAGE TO CHIMMEYS AND TV ANTENNA; PUSHES OVER SHALLOW ROOTED TREES
73 - 112 PEELS SURFACE OFF ROOFS; WINDOWS BROKEN; LIGHT TRAILER HOUSES PUSHED OR OVERTURNED; MOVING AUTOMOBILES PUSHED OFF ROADS
113 - 157 ROOFS TORN OFF HOUSES; WEAK BUILDINGS AND TRAILER HOUSES DESTROYED; LARGE TREES SNAPPED AND UPROOTED
158 - UP SEVERE DAMAGE; CARS LIFTED OFF GROUND
...
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kd6oji
02/07/2011 16:30
Neat article RE Ham Radio:: http://www.wired.c
om/epicenter/2011/
02/ham-radio-tweet
s/
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