** Evaluation Product 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 **

[MN]:3hr_QPF~Mean ->Mean 700-500 layer average UVV and 1000-500 mb 
                    mean thickness with the ARITHMETIC MEAN of 3-hr 
		    precip
[MD]:3hr_QPF~Median ->As above, but the MEDIAN of 3-hr precip
[PM]:3hr_QPF~ProbMatch ->As above, but the PROBABILITY MATCHED MEAN of 
                         3-hr precip. [A description of probability matching
		         is described in Ebert, Elizabeth E. 2001: 
		         Ability of a Poor Man's Ensemble to Predict 
		         the Probability and Distribution of 
		         Precipitation. Monthly Weather Review: 
		         Vol. 129, No. 10, pp. 2461-2480.]
[MN]:3hr_QPF~Mean_Ctls ->As above, but the ARITHMETIC MEAN of 3-hr precip
                         from the 3 control members only
[MN]:24hr_QPF~Mean ->ARITHMETIC MEAN of 24-hr precip
[MD]:24hr_QPF~Median ->MEDIAN of 24-hr precip
[PM]:24hr_QPF~ProbMatch ->PROBABILITY MATCHED MEAN of 24-hr precip
[MN]:3hr_QPF~Mean_Ctls ->ARITHMETIC MEAN of 24-hr precip from the 3 
                         control members only
		       
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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