Fire risk values, analysed
Description
In the decision support system Fire Risk Forest and Land, fire risk forecasts are calculated and meteorological data are reported to support decisions on fire in vegetation. Once the forecast has ended, a new calculation of the fire risk values is made based on the latest available weather data. This “analysis data” is stored. After each year’s fire season, the analysed historical data set of the model-calculated boxes of 11*11 km is saved with the midpoint given in x and y coordinates. Please note that the WMS service only contains the previous year’s data.
Each 11*11 km square has the attributes listed below (some variation may occur from year to year):
ID: Internal MSB Task
Puncture: Internal MSB task for unique grid box. The data was added in 2015, before there was no value.
Time: It was used until 2014 to indicate the date of statistical values. As of 2015, dates will be stored in the “Date” field.
Temp: Temperature in degrees Celsius 2 m above ground at 12 UTC according to the calculation model for the current grid.
RH: Relative humidity expressed in % 2 m above the ground at 12 UTC according to the calculation model for the current grid grid.
Wind speed: Wind speed in m/s (medium wind) 10 m above the ground at 12 UTC according to the calculation model for the current grid pane.
Downstairs: Precipitation current day 18 UTC-18 UTC the previous day according to the calculation model for the current grid grid.
FFMC: Fine Fuel Moisture Code represents the humidity of leaves and grass. The maximum water storage in this layer is less than 1 mm. Included in the FWI model.
DMC: The Duff Moisture Code represents the humidity in a slightly deeper layer than the most superficial in the FWI model, e.g. moss and the superficial soil layer. The storage in this layer corresponds to about 15 mm of water.
DC: The Drought Code shows the moisture content of thick compact humus layers (about 100 mm water). DC is part of the FWI model.
ISI: The initial spread index. A measure of the rate of spread of the fire. An index used to calculate an FWI. Calculated from FFMC and reinforced by wind speed.
BUI: Buildup index. Can be seen as a general measure of humidity for the slightly deeper soil layers. An index value used to calculate a fire risk value, FWI. Weighted average of DMC and DC.
FWI: Fire Weather Index. Fire risk value calculated from ISI and BUI, which in turn are based on three basic values for moisture content in different layers (FFMC, DMC and DC). The input to the calculation is the daily rainfall as well as temperature, relative humidity and wind speed in the middle of the day.
FWI index: Index of spread risk and fire behaviour in forest land. Based on the basic value FWI (see above). Currently divided into six different index levels (1, 2, 3, 4, 5, 5E) where index 1 is the lowest risk and index 5E is the highest risk.
Medium: Daily average temperature 2 m above ground according to SMHI calculation model for the current grid grid.
HBV: Weighted soil moisture value based on the moisture in two soil layers calculated with HBV-Skog, which is a special adaptation of the hydrological runoff model HBV (Hydrological Agency’s Water Balance Department). The input to the model is daily rainfall and daily average temperature.
HBV-ö: HBV upper ground layer (see HBV above)
HBV-u: HBV lower ground layer (see HBV above)
Gras: Fire risk levels for grass fires, the following indications are used:
Snow — Snow-covered land
Small — Small/moderate grass fire hazard
Big — Big grass fire hazard
Li A — Small/moderate grass fire hazard and declining grass fire season
St A — Big grass fire hazard and declining grass fire season
End of the Grass Fire Season
Wind direction: Wind direction in degrees from where the wind comes from (division 360 degrees, 180 degrees equivalent to southern wind) at 12 UTC according to the calculation model for the current grid pane.
E: The east-west position (centre) of the grid pane specified in SWEREF 99 TM. NOTE: prior to 2015, this information was entered in box ‘y’.
N: The north-south position of the grid (centre point) specified in SWEREF99 TM. NOTE: prior to 2015, this information was entered in box “x”.
Municipality: The commune code of the municipality within which the coordinate in the fields “E” and “N” is located.
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