NCEP HPC and SPC
SREF (MODEL) DERIVED
WINTER WEATHER IMPACT GRAPHICS Prob %
 
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AREA: 
 AK CONUS
 
Forecast Hour

Loop  03  06  09  12 
15      18  21  24  27 
30      33  36  39  42 
45      48  51  54  57 
60      63  66  69  72 
75      78  81  84  87 
Probability of Significant Impacts
Surface Visibility
Rate (Intensity)
Duration
 
≤
1/2 Mile 		1"/hr 12 hr
 
≤
1/4 Mile 		2"/hr 24 hr
 
≤
1/8 Mile 		3"/hr 48 hr
 
Probability for Other Impacts
 
Accumulation on Roads
ZR ≥.01"
Blizzard Criteria

Exceedance of NWS Winter Storm Watch/Warning Criteria
12h Snow ZR
24h Snow

Mean Event Total Accumulations
Combined S/IP ZR
 
S/IP
ZR
ABOUT THESE GRAPHICS
EMC's SREF HOME PAGE
HPC's Winter Weather Forecasts
HPC WWD Model Diagnostics
CONUS radar and current watch/warning loop
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