** Severe Weather Options **

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** 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 **

[MDXN]:CravenBrooks_SigSvr ->Craven-Brooks significant severe is
the product of MUCAPE x 0-6 KM shear.
Median contours begin at 10000 m^3/s^3
with the union (dashed red) and
intersection (dashed blue) at 10000
m^3/s^3 shown.
[MDXN]:SigTor_Param ->Signficant tornado parameter.  Median contours
begin at 1 with the union (dashed red)
and intersection (dashed blue) at 1 shown.
contours begin at 1 with the union (dashed
red) and intersection (dashed blue) at 1
shown.
[MNSD]:CravenBrooks_SigSvr ->Mean and standard deviation of Craven-
Brooks Significant Severe (MUCAPE X 6 KM
shear)
[MNSD]:SigTor_Param ->Mean and standard deviation of significant
[MN]:Supercell_Composite(Eff_Shear)
[CPR]:ConPcpn_1000MUCAPE_30EffShr ->Product of the probabilities:
Convective precip >= .01"; MUCAPE
>= 1000 J/kg; Effective Shear >=
30 kts
[CPR]:ConPcpn_1000MUCAPE_40EffShr ->As above but MUCAPE >= 1000 J/kg
and effective shear >= 40 kts
[CPR]:ConPcpn_2000MUCAPE_30EffShr ->As above but MUCAPE >= 2000 J/kg
and effective shear >= 30 kts
[CPR]:ConPcpn_2000MUCAPE_40EffShr ->As above but MUCAPE >= 2000 J/kg
and effective shear >= 40 kts
[CPR]:ConPcpn_3000MUCAPE_20EffShr ->As above but MUCAPE >= 3000 J/kg
and effective shear >= 20 kts
[CPR]:ConPcpn_500MUCAPE_30EffShr ->As above but MUCAPE >= 500 J/kg
and effective shear >= 30 kts
[CPR]:ConPcpn_500MUCAPE_40EffShr ->As above but MUCAPE >= 500 J/kg
and effective shear >= 40 kts
[PR]:CravenBrooks_SigSvr>=20000 ->Probability Craven-Brooks significant
severe (MUCAPE X 0-6 KM shear) >=
20000 m^3/s^3
[PR]:CravenBrooks_SigSvr>=40000 ->As above but for 40000 m^3/s^3
[PR]:SigTor_Param>=1 ->Probability significant tornado parameter >=
1
[PR]:SigTor_Param>=3 ->As above but for significant tornado parameter
>= 3
[PR]:Supercell_Comp_Param>=1 ->Probability supercell composite
parameter >= 1
[PR]:Supercell_Comp_Param>=3 ->As above but for supercell composite
parameter >= 3
[SP]:CravenBrooks_SigSvr_10000 ->Spaghetti plot of Craven-Brooks
significant severe parameter at
10000 m^3/s^3
[SP]:CravenBrooks_SigSvr_20000 ->As above but for Craven-Brooks
index of 20000 m^3/s^3
[SP]:CravenBrooks_SigSvr_40000 ->As above but for Craven-Brooks
index of 40000 m^3/s^3
[SP]:SigTor_Param_1 ->Spaghetti plot of significant tornado index
of 1
[SP]:Supercell_Comp_Param_1 ->Spaghetti plot supercell composite
parameter of 1

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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