The term standard fire-weather station refers primarily to a permanent, manually operated station. Such stations are part of a network maintained for purposes of routine fire danger rating and fire weather forecasting. Many of these stations also serve as National Weather Service climatological stations. As defined by the National Wildfire Coordinating Group, Weather Station Handbook-An Interagency Guide for Wildland Managers*, Chapter 6.1, a standard fire weather station contains the following equipment: anemometer and counter for ten-minute wind run, wind direction indicator, liquid-in-glass minimum and maximum thermometers and Townsend support, fan-aspirated psychrometer, nonrecording rain gauge with support, fuel moisture stick with support brackets and fuel moisture scale, and instrument shelter.
The 200-455 Totalizing Anemometer with Continuous Counting and 10-Minute Totalizer provides a record of the total horizontal wind movement past a fixed point, measured to the nearest 0.1 mile. The unit may be run in either continuous or 10-minute mode. The 10-minute mode automatically logs the wind run distance for a period of ten minutes and then shuts down. The results of a logging event are displayed to the nearest tenth of a mile on the liquid crystal display until the operator resets the counter to zero. The system includes an anemometer with 40' cable and a control module which digitally displays the total wind run distance.
The 225-564 Fan Psychrometer is used to determine dew point and relative humidity. It consists of 9.5 inch dry and wet bulb thermometers mounted on a common back, water bottle, fan, motor, and 6-volt battery. It is easier to read and provides more consistent results than a conventional sling psychrometer. The components are mounted on a wooden base. The bulb of the lower thermometer is covered with a close fitting tubular muslin wick. When the fan is turned on for a period of 2-3 minutes, water is evaporated from the wick-covered thermometer. The wet bulb and dry bulb temperatures are then recorded and the humidity is determined using the provided chart or a psychrometric slide rule.
The 210-4420 Series Min-Max Thermometer Sets, made to U.S. National Weather Service specifications, consist of a Townsend support (a weatherproof metal stand and base with two adjustable thermometer holders attached to rotatable metal posts), a minimum indicating thermometer and a maximum indicating thermometer, each secured to a stainless steel metal plate. The alcohol filled minimum thermometer is 10-1/2" long with graduations and numerals etched in the glass. It has a long, thin, dark colored float, held in tension in the capillary, which moves down towards the bulb with lowering temperatures. When the air temperature warms, the alcohol rises past the float, which remains fixed at the minimum temperature. The mercury filled maximum thermometer is also an etched stem type, 10-1/2" long. It has a constricted capillary just above the bulb which prevents the mercury from flowing back with lowering temperatures. It remains fixed at the warmest temperature to which it has been exposed.
The 190-200 Series Tripod Towers provided by NovaLynx are constructed of steel tubing for durability and strength. Five foot and ten foot heights are available. Horizontal bracing is a feature of the tripod towers. Foot brackets can be bolted onto concrete foundations or onto wooden platforms for either permanent or temporary installation. Sensors may be clamped directly onto the tower legs or elevated above the tower using insertable masts. For stability, both tripod towers require that the mast be inserted into the two collar clamps. Guy kits are recommended for areas with high winds and for masts that extend above the tower by ten feet. Locations exposed to lightning require a grounding kit.
The 260-2510 Rain and Snow Gauge is an all aluminum gauge with a total capacity of 20 inches of rainfall. The upper portion of the funnel is cylindrical in shape and is turned to a sharp edge. Rainwater falling into the funnel is delivered into the receiver. The ratio is 10 to 1, so that one inch of rainfall delivers ten inches of water to the receiver. The gauge can be read to 0.01 inch. The capacity of the receiver is two inches of rainfall. Any excess overflows into the outer chamber where it can be measured after the quantity in the receiver has been measured and removed. When used as a snow gauge, the receiver and funnel are removed and the snowfall is measured directly. A black lamacoid measuring stick with both English and metric markings is included.
The 260-2520 Forestry Rain Gauge includes a removable funnel, a calibrated measuring tube, a dipstick graduated to 0.01 inch, and an overflow can. The measuring tube holds exactly 0.5 inch; total gauge capacity is 7 inches. Snow can be collected by the overflow can and melted for measurement with the measuring tube and dipstick.
Instrument shelters protect sensors and other instruments against errors and damage due to solar radiation, wind, and precipitation. The 380‑602 Medium Instrument Shelter can house the 225-564 Fan Psychrometer, the control module and battery for the 200-455 Totalizing Anemometer, and still have room to mount a min-max thermometer if desired. It is constructed of white-painted wood and has a double roof to guard against solar radiation heating. Louvered sides and holes in the bottom promote natural air circulation. Optional wood legs are available. The shelter is shipped partially assembled, but can be assembled in approximately 30 minutes.
The 380-605 Large Instrument Shelter is built to National Weather Service standards. It is sometimes called a Cotton Region Shelter. The enclosure is large enough to house several recording instruments, such as hygrothermographs. Thermometers and sensor probes can be mounted on a board which spans the inside of the box. The shelter is constructed of clear pine and painted with three coats of white latex paint. It has louvers on all four sides and vents in the bottom to provide natural ventilation while excluding solar radiation and precipitation, allowing ambient conditions to exist inside. A double roof provides added protection against direct solar radiation. A lock and key are included for security. Optional wood or metal legs are available. Legs should be anchored to prevent overturning of the shelter in high winds. Shipped partially assembled, the shelter can be assembled easily in approximately 30 minutes.
* Weather Station Handbook-An Interagency Guide for Wildland Managers - Important note: This is a very large file in PDF format. We recommend downloading it to your computer before trying to open it. In many web browsers, you can do this by right clicking on the link and selecting "Save Target As" or "Save Link As".
Model 200-455 Totalizing Anemometer Sensor
Model 225-564 Fan Psychrometer
Model 225-7918 Fuel Moisture Sticks
Model 260-2510 Rain and Snow Gauge
Model 260-2520 Forestry Rain Gauge
380-601 Small Instrument Shelter
Model 380-602 Medium Instrument Shelter
Model 380-605 Large Instrument Shelter
200-455 Totalizing Anemometer includes sensor with 40' cable and control module
200-455B4 Battery Assembly, 12 Vdc 4 AH
200-455B7 Battery Assembly, 12 Vdc 7 AH
310-140 AC Battery Charger
200-2135 Wind Minder Vane & Indicator (limited supply)
210-4420 Minimum-Maximum Thermometer Set, °F
includes 210-4429 and 210-4425 Thermometers and 210-4422 Townsend Support
210-4421 Minimum-Maximum Thermometer Set, °C
includes 210-4430 and 210-4426 Thermometers and 210-4422 Townsend Support
225-564 Fan Psychrometer, °F
225-565 Fan Psychrometer, °C
225-568 Replacement Wicks, 24" length
225-7917 Fuel Moisture Scale
225-7918 Fuel Moisture Stick
225-7919 Support Brackets, set of 2
260-2510 Rain and Snow Gauge
260-2510S Tripod Support
260-2520 Forestry Rain Gauge
380-601 Small Instrument Shelter
380-602 Medium Instrument Shelter (discontinued)
380-603 Wood Leg Kit (discontinued)
380-605 Large Instrument Shelter
380-608 Wood Leg Kit
380-609 Metal Leg Kit
190-310 Aluminum Sensor Mast, 5'
190-320 Aluminum Sensor Mast, 10'
190-510 Tripod, 5'
190-520 Tripod, 10'
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