** Fire Weather Options **


** DEFINITIONS **

[CPR]  = Combined probability (Prob_Field_1 x Prob_Field_2 x ... x 
         Prob_Field_N)
[MAX]  = Maximum from any member at each grid point
[MD]   = Median
[MDXN] = Median value contoured.  The dashed red line is the union of 
         all members at the lowest contour value plotted (i.e., where 
	 at least one of the 16 members exceeds the value of the first 
	 median contour).  The dashed blue line is the intersection of
	 all members at the lowest contour value plotted (i.e., where 
	 all 16 members exceed the value value of the first median 
	 contour).
[MIN]  = Minimum from any member at each grid point
[MN]   = Mean
[MNSD] = Mean and Standard Deviation
[PM]   = Probability Matched Mean Value
[PR]   = Probability (percentage of members meeting/exceeding some 
         condition)
[SP]   = Spaghetti


** SPECIFIC INFORMATION ON AVAILABLE FIELDS **

[MAX]:10m_Wind ->Maximum 10 meter wind (mph) at each grid point
[MAX]:2m_DewPoint ->Maximum 2 meter dew point (degF) at each grid point
[MAX]:2m_Temperature ->Maximum 2 meter temp (degF) at each grid point
[MAX]:Fosberg_Index ->Maximum Fosberg Index value at each grid point
[MDXN]:2m_DewPoint ->Median 2 meter dew point (contours start at
                       40 degF) with union (dashed red) and intersection
		       (dashed blue) at 40 degF.
[MDXN]:Fosberg_Index ->Median Fosberg Index value (contours start at
                       50) with union (dashed red) and intersection
		       (dashed blue) at Fosberg=50.
[MIN]:2m_DewPoint ->Minimum 2 meter dew point (degF) at each grid point
[MIN]:2m_RH ->Minimum 2 meter RH (%) at each grid point
[MNSD]:2m_RH ->Mean and standard deviation of 2 meter RH
[MNSD]:Fosberg_Index ->Mean and standard deviation of Fosberg Index
[MNSD]:LAS_Index ->Mean and standard deviation of Lower Atmospheric
                   Stability Index (LASI)
[MN]:10m_Wind ->Mean of the 10 meter wind
[MN]:2m_DewPoint ->Mean of 2 meter dew point (degF)
[MN]:2m_Temperature ->Mean of 2 meter temperature (degF)
[MN]:Fosberg_Index ->Mean of the Fosberg Fire Weather Index
[PR]:10m_WSPD>=20mph ->Probability 10 meter wind speed >= 20 mph
[PR]:10m_WSPD>=30mph ->Probability 10 meter wind speed >= 30 mph
[PR]:2m_DewPoint<=15degF ->Probability 2 meter dew point <= 15 degF
[PR]:2m_DewPoint<=25degF ->Probability 2 meter dew point <= 25 degF
[PR]:2m_DewPoint<=35degF ->Probability 2 meter dew point <= 35 degF
[PR]:2m_DewPoint<=45degF ->Probability 2 meter dew point <= 45 degF
[PR]:2m_TEMP>=60degF ->Probability 2 meter temperature >= 60 degF
[CPR]:V>=15_RH<=30_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 15 mph; RH <= 30%; Temp >= 60 degF;
				     12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[CPR]:V>=20_RH<=10_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 20 mph; RH <= 10%; Temp >= 60 degF;
			             12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[CPR]:V>=20_RH<=20_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 20 mph; RH <= 20%; Temp >= 60 degF;
				     12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[CPR]:V>=20_RH<=30_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 20 mph; RH <= 30%; Temp >= 60 degF;
				     12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[CPR]:V>=30_RH<=10_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 30 mph; RH <= 10%; Temp >= 60 degF;
				     12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[CPR]:V>=30_RH<=20_T>=60_P12hr<.01 ->Product of the probabilities: wind
                                     >= 30 mph; RH <= 20%; Temp >= 60 degF;
				     12-hr Precip < 0.01".  Because this
				     uses 12-hr precip, it is unavailable
				     if forecast hour < 12.
[PR]:Fosberg_Index>=50 ->Probability Fosberg Fire Weather Index >= 50
[PR]:Fosberg_Index>=70 ->Probability Fosberg Fire Weather Index >= 70
[PR]:2m_RH<=10% ->Probability 2 meter RH <= 10%
[PR]:2m_RH<=20% ->Probability 2 meter RH <= 20%
[PR]:Tot_12hr_Pcpn<=.01" ->Probability 12-hr total precipitation <= .01"


All SREF information presented herein is for guidance purposes 
only and should not be confused with official SPC operational 
forecasts.  Links to official SPC operational products are found 
at the bottom of every menu.

Many of the SREF products were developed for testing the utility 
of SREF analysis in the prediction of SPC mission critical items, 
including: thunderstorms and severe thunderstorms, large scale 
critical fire weather conditions, and mesoscale areas of hazardous 
winter weather. In order to accomplish this goal and test new and 
unqiue methods of SREF application in an operational environment, 
many fields not produced in the NCEP postprocessor were calculated 
locally for SPC purposes.



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