Biral SWS-100-LW: SWS-200-LW, User Manual

Page: 64 / 75

Product Overview Section 6
54
Automated Measurements
US Precipitation Definitions
Drizzle
Slight A trace to 0.01 inches (0.3 mm)/hour.
Moderate 0.01 inches (0.3mm) to 0.02 inches (0.5 mm)/hour.
Heavy More than 0.02 inches (0.5 mm)/hour.
Rain
Slight A trace to 0.10 inches (2.5 mm)/hour.
Moderate 0.10 to 0.30 inches (2.6 to 7.6 mm)/hour.
Heavy More than 0.30 inches (7.6 mm)/hour.
Snow
Slight
Visibility equal to or greater than 5/8 statute miles, 0.55
nautical miles, or 1,000 meters.
Moderate
Visibility between 1/4 and 5/8 statute miles, 0.2 to 0.55
nautical miles, or 400 to1000 meters.
Heavy
Visibility equal to or less than 1/4 statute miles, 0.2 nautical
miles, or 400 meters.
Table 6-4 US Precipitation Intensity Definitions
(Based on Federal Meteorological Handbook No. 1 Part B.1.)
The following present weather codes are used on the SWS – LW series of sensors:
Present Weather Codes – SWS-100 – LW
Code Description
XX Not Ready (first 5 measurement periods from restart).
00 No Significant weather observed.
04 Haze or smoke.
30 Fog.
40 Indeterminate precipitation type.
50 Drizzle.
60 Rain.
70
Snow.
Table 6-5 SWS-100 – LW WMO Codes