** 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 ** [PR]:Prob_Ptype_Snow_or_Ice ->Probability NCEP precipitation type algorithm indicates snow OR freezing rain OR ice pellets [PR]:SnowRate_>=_1"/Hour ->Probability snowfall rate exceeds 1"/hour for a 3h period. Conversion of liquid amount to snowfall uses a snow density (kg/m^3) = 109 + 6*(TMP - 273.15) [from J. Hydromet, Aug 2001, pg 377] where TMP is the maximum temperature of the surface or from the saturated layer up to 300 mb AGL [MN]:Snowfall_(3hrs) ->SREF mean snowfall over the previous 3h period. Conversion of total precip to snow uses a snow density (kg/m^3) = 109 + 6*(TMP - 273.15) [from J. Hydromet, Aug 2001, pg 377] where TMP is the maximum temperature of the surface or from the saturated layer up to 300 mb AGL [MAX]:Snowfall_(3hrs) ->As above, except the maximum from any SREF member [PR]:Blizzard_Conditions ->Probability of snow or ice pellets AND wind >= 30 kts AND visibility <= 1/4 mile [PR]:1000-500MB_Thck<=528 ->Probability 1000 to 500 mb thickness <= 5280 meters [PR]:1000-500MB_Thck<=534 ->As above but for thickness <= 5340 meters [PR]:1000-500MB_Thck<=540 ->As above but for thickness <= 5400 meters [PR]:Dendritic_Depth>=50mb ->Probability dendritic growth conditions occur over a 50 mb depth. Dendritic growth conditions are defined here as: omega < 0; dew point depression <= 3 degC in the layer; -11 degC <= temp <= -17 degC. [SP]:1000-500MB_Thck_5400m ->Spaghetti plot of 5400 meters 1000 to 500 mb thickness [SP]:850MB_Temp_0C ->Spaghetti of 850 mb temperature at 0 degCAll 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.