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Clipper Model QPF Comparison and Ratios


Rainshadow
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This is for PHL, no snowfall conversion for GFS.  H20 equiv / snow
 
Actual 1.5"; .12" water equivalent
 
 

NAM (00z, 06z, 12z, 18z)

1/3:  n/a, n/a, .07" / 0.6";  .04" / 1"

1/4: 0 / 0; .13" / 1.7";  .13" / 1.8";  .13" / 1.8"

1/5: .10" / 1.5";  .12" / 1.5"; .13" / 1.5";  .11" / 1.1"

1/6: .10" / 1.4";  .12" / 1.7"

 
SREF (03z, 09z, 15z, 21z)

1/3:  n/a, n/a, .05" / 0.6";  .05" / 0.7"

1/4: .08" / 1.2; .10" / 1.3";  .12" / 1.4";  .12" / 1.4"

1/5: .14" / 1.8";  .14" / 1.8"; .15" / 1.8";  .13" / 1.6"

1/6: .12" / 1.5";  .14" / 1.8"

  

Operational GFS  (00z, 06z, 12z, 18z)

1/3:  n/a;  n/a; 0 ;  .06" 

1/4: .08" ; .10";   .11" ;  .08"

1/5: .09";  .08", .10";  .10" 

1/6: .13";  .14"

Ratios off of CoCoRahs and NWS Climates
 
Maryland Eastern Shore:  12:1
New Castle:                     12:1
Kent:                               11:1
Sussex                            11:1

Berks:                             15:1
Bucks:                             10:1
Carbon:                            12:1
Chester:                           14:1
Lehigh:                             13:1
Monroe:                            10:1
Montgomery                     14:1
Northampton:                    10:1
Philadelphia & Delaware:    13:1

Atlantic:                          11:1
Burlington:                      14:1
Camden:                         13:1
Cape May:                       14:1
Cumberland/Salem           13:1
Gloucester                       14:1
Hunterdon:                       11:1
Mercer:                            11:1
Middlesex:                       12:1
Monmouth:                       12:1
Morris:                             14:1
Ocean:                            14:1
Somerset:                        12:1
Sussex:                           12:1

Warren:                           16:1

 

Actual snow

 

post-27-0-28794200-1420656947.png

 

 PGFS model conversion snowfall forecast. 

 

post-27-0-38869900-1420656962.png

 

 

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