The Weather Forecasting Forum

Here are a few Winter scripts: For those of us tired of rain, and the soon to arrive Atlantic storms of August/September we always seem to get in the Mid Atl states. Have not checked them for accuracy as the north pole is enjoying the Summer and Rawinsonde data for the south pole is a little on the sparse side.
Edited: forgot to include the "over" for over fill in first 2 scripts.


#700 to 850 thck APPROXIMATION OF RAIN/SNOW LINES blue=snow, red=anything is possible, green=rain
erase
analyze,sdif=1:2 stor=2 hght h850 stor=1 hght h700
analyze,over fill color=0:255:0 grtn=1555 fill color=255:0:0 grtn=1525 fill color=0:0:255 grtn=0
analyze,cont cint=15
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#1000 TO 850 thck APPROXIMATION OF RAIN/SNOW LINES blue=snow, red=anything is possible, green=rain
erase
analyze,sdif=1:2 stor=2 hght h000 stor=1 hght h850
analyze,over fill color=0:255:0 grtn=1310 fill color=255:0:0 grtn=1290 fill color=0:0:255 grtn=0
analyze,cont cint=10
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This script is on the board, thanks to Peter for providing:


#Snow script (1)
#S=(H850-H700)+2*(H1000-H850)
ERASE
ANALYZE, OVER FILL LSTN=4179 COLOR=050:200:255 FILS=0 SSUM 4:7 STOR=7 SDIF 5:6 STOR=6 HGHT H850 STOR=5 HGHT H1000 STOR=4 SMLC 3:2 STOR=3 SDIF 2:1 STOR=2 HGHT H700 STOR=1 HGHT H850
ANALYZE,CONT EQUA=4179 LINE=2 COLOR=255:000:000
ANALYZE, OVER FILL LSTN= 4500 GRTN=4179 COLOR=000:200:050 FILS=2
#ANALYZE, CONT CINT=100 COLOR=100100
STAMP



#wetbulb below zero area - for areas of possible "wetbulbing"
erase
analyze,over fill fils=3 lstn=0 bulb
analyze,cont cint=2 color=200:0:0
stamp
P19

wetbulb zero at surface, 925mb, 850mb, 700mb.

ERASE
ANALYZE,cont equa=0 BULB H700
ANALYZE,FILL COLOR=200:0:0 FILS=4 LSTN=0 BULB H850
ANALYZE,FILL COLOR=0:200:0 FILS=5 LSTN=0 BULB H925
ANALYZE,OVER FILL COLOR=200:0:200 FILS=6 LSTN=2.5 BULB HSFC
STAMP

P19

These are EXPERIMENTAL. The Garcia Method of snow forecasting uses ave mixr * 2 to calculate Max snow depth for a forecast area. The first script uses
ave. mixr from 500mb to surf and multiplies it by 2 to show max snow level, the "snow lines" for various thickness and surf freezing temp is overlayed. I
realize this is mixing different snow ideas, just thought I would throw it out there and see how it works.

The second overlays "snow lines" over ave. relh. Hope they end up working, anyone with suggestions/corrections, let me know.

#snow ave mixr and lines
ERASE
ANALYZE,stor=3 savg=1:2 stor=2 mixr h700 stor=1 mixr h500
analyze,stor=6 savg=5:4 stor=5 mixr h850 stor=4 mixr hsfc
analyze,stor=8 smlc=7:2 stor=7 savg=6:3
ANALYZE,fill color=200:200:255 grtn=2
ANALYZE,fill color=255:150:0 grtn=4
ANALYZE,fill color=0:255:0 grtn=6
ANALYZE,over fill color=0:200:0 grtn=8
analyze,cont cint=1 dots grtn=0
analyze,cont equa=32 line=2 color=100:0:100 dots over fill fils=4 lstn=32 degf temp hsfc
analyze,cont equa=5400 line=2 color=0:0:255 sdif=1:2 stor=2 hght h000 stor=1 hght h500
analyze,cont equa=2840 line=2 color=0:255:0 sdif=3:4 stor=4 hght h000 stor=3 hght h700
analyze,cont equa=1530 line=2 color=255:0:0 sdif=1:2 stor=2 hght h850 stor=1 hght h700
analyze,cont equa=1310 line=2 color=255:75:0 sdif=1:2 stor=2 hght h000 stor=1 hght h850
stamp


#snow ave relh and lines
ERASE
ANALYZE,stor=1 relh h500
ANALYZE,stor=2 relh h700
ANALYZE,stor=3 relh h850
ANALYZE,stor=4 relh hsfc
ANALYZE,stor=5 savg=1:2
ANALYZE,stor=6 savg=3:4
ANALYZE,stor=7 savg=5:6
ANALYZE,fill color=200:200:255 grtn=70
ANALYZE,fill color=255:150:0 grtn=75
ANALYZE,fill color=0:255:0 grtn=80
ANALYZE,over fill color=0:200:0 grtn=85
analyze,cont cint=5 dots grtn=65

analyze,cont equa=32 line=2 color=100:0:100 dots over fill fils=4 lstn=32 degf temp hsfc
analyze,cont equa=5400 line=2 color=0:0:255 sdif=1:2 stor=2 hght h000 stor=1 hght h500
analyze,cont equa=2840 line=2 color=0:255:0 sdif=3:4 stor=4 hght h000 stor=3 hght h700
analyze,cont equa=1530 line=2 color=255:0:0 sdif=1:2 stor=2 hght h850 stor=1 hght h700
analyze,cont equa=1310 line=2 color=255:75:0 sdif=1:2 stor=2 hght h000 stor=1 hght h850
stamp

P19

I hope all previous scripts have been valid (add this one to the list), as always if there is a mistake somewhere let me know.
Also working on Snow Squall index, if Tim is checking or anyone else for that matter and can tell me if:

analyze,stor=5 grtn=60 relh h850 stor=4 grtn=60 relh hsfc

is valid and will exclude relh less than 60% for the press. levels.

IFF the ingredients for a snow squall are wind, moist, and instabiltiy...the script below fills for moist above 60% relh, wspd >9 m/s, and thte diff surf. to 850.

#snow squall ingred. thte fill blue, relh vert fill, windspeed horiz fill
erase
analyze,stor=2 thte h850 stor=1 thte hsfc
analyze,over fill grtn=0 color=200:200:255 sdif=1:2
analyze,stor=3 relh h850 stor=4 relh hsfc
analyze,over fill grtn=60 fils=6 savg=3:4
analyze,stor=6 wspd h850 stor=5 wspd hsfc
analyze,over fill grtn=9 fils=5 savg=5:6
analyze,cont equa=0 color=255:0:0 line=2 temp hsfc
stamp

P19

After getting hammered with snow the other snow scripts were a little low. Using PW w/snow lines was more accurate for my area in Central VA. Hope Y'all have a Merry Christmas!

#Precip Water and snow lines
Erase
analyze,sdvc=9:25.4 stor=9 ssum=7:8 stor=8 mixr hsfc stor=7 ssum=3:6 stor=6 ssum=4:5 stor=5 mixr h925 stor=4 mixr h850 stor=3 ssum=1:2 stor=2 mixr h700 stor=1 mixr h500
analyze,fill color=238:232:170 grtn=0
analyze,fill color=250:250:210 grtn=0.6
analyze,fill color=255:228:181 grtn=0.8
analyze,fill color=245:222:179 grtn=1
analyze,fill color=245:175:150 grtn=1.2
analyze,fill color=205:225:185 grtn=1.4
analyze,fill color=185:215:170 grtn=1.6
analyze,fill color=165:205:155 grtn=1.8
analyze,over Fill color=145:195:140 Grtn=2.0
analyze,cont cint=0.1 color=0:125:0 dash
analyze,cont equa=32 color=100:0:100 dots over fill fils=1 lstn=32 degf temp hsfc
analyze,cont equa=5400 color=0:0:255 sdif=1:2 stor=2 hght h000 stor=1 hght h500
analyze,cont equa=2840 color=0:255:0 sdif=3:4 stor=4 hght h000 stor=3 hght h700
analyze,cont equa=1530 color=255:0:0 sdif=1:2 stor=2 hght h850 stor=1 hght h700
analyze,cont equa=1310 color=255:75:0 sdif=1:2 stor=2 hght h000 stor=1 hght h850
stamp

P19

The last post included fill for below zero surf. temp. It looked a little congested so replaced that fill with purple zero line.

#Precip Water and snow lines
Erase
analyze,sdvc=9:25.4 stor=9 ssum=7:8 stor=8 mixr hsfc stor=7 ssum=3:6 stor=6 ssum=4:5 stor=5 mixr h925 stor=4 mixr h850 stor=3 ssum=1:2 stor=2 mixr h700 stor=1 mixr h500
analyze,fill color=238:232:170 grtn=0
analyze,fill color=250:250:210 grtn=0.6
analyze,fill color=255:228:181 grtn=0.8
analyze,fill color=245:222:179 grtn=1
analyze,fill color=245:175:150 grtn=1.2
analyze,fill color=205:225:185 grtn=1.4
analyze,fill color=185:215:170 grtn=1.6
analyze,fill color=165:205:155 grtn=1.8
analyze,over Fill color=145:195:140 Grtn=2.0
analyze,cont cint=0.1 color=0:125:0 dash
analyze,cont equa=32 color=100:0:100 degf temp hsfc
analyze,cont equa=5400 color=0:0:255 sdif=1:2 stor=2 hght h000 stor=1 hght h500
analyze,cont equa=2840 color=0:255:0 sdif=3:4 stor=4 hght h000 stor=3 hght h700
analyze,cont equa=1530 color=255:0:0 sdif=1:2 stor=2 hght h850 stor=1 hght h700
analyze,cont equa=1310 color=255:75:0 sdif=1:2 stor=2 hght h000 stor=1 hght h850
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P19