WxSim & NWS Forecast Comparison

National Weather Service (NW), Actual Observed (Act), WxSim Generated (WS)
Updated: 04-03-25 at 4:55 am
Goal Forecast Day Day +1 Day +2
± 2.0° F High Low High Low High Low
Date NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
04-03-25 67   64 45   49 59   60 38   43 48   46 40   42
04-02-25 47 50.8 50 34 36.5 35 66   63 44   46 58   60 38   41
04-01-25 48 47.8 48 22 27.2 26 47 50.8 51 34 36.5 36 68   66 48   46
03-31-25 41 72.6 68 68 37.2 39 36 47.8 49 49 27.2 29 23 50.8 49 48 36.5 34
03-30-25 35 45.0 50 45 42.1 45 42 72.6 65 66 37.2 39 36 47.8 47 45 27.2 30
03-29-25 57 54.8 54 36 36.0 38 48 45.0 50 42 42.1 44 67 72.6 65 35 37.2 37
03-28-25 27 59.3 56 56 47.6 41 43 54.8 68 61 36.0 43 39 45.0 50 49 42.1 44
03-27-25 47 50.1 47 31 27.1 32 55 59.3 53 41 47.6 41 64 54.8 71 39 36.0 45
03-26-25 46 49.0 46 27 24.2 25 48 50.1 47 31 27.1 32 54 59.3 54 40 47.6 38
03-25-25 49 52.8 47 26 26.5 27 47 49.0 44 27 24.2 26 47 50.1 48 29 27.1 31
03-24-25 47 42.1 41 32 32.3 34 49 52.8 47 28 26.5 29 46 49.0 44 26 24.2 25
03-23-25 40 40.8 44 27 29.8 29 47 42.1 42 32 32.3 33 46 52.8 47 29 26.5 28
03-22-25 56 59.9 56 21 25.6 22 42 40.8 45 29 29.8 31 45 42.1 50 33 32.3 33
03-21-25 43 48.0 44 30 23.7 29 55 59.9 53 21 25.6 21 43 40.8 44 30 29.8 31
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 2 4 3 8 2 3 4 7 0 2 4 6
% Succ 15.4   30.8 23.1   61.5 16.7   25.0 33.3   58.3     18.2 36.4   54.5
Ave Error 8.0   3.0 5.5   2.6 7.0   4.9 8.2   2.9 7.6   5.5 5.1   3.1
Net Error -6.9   -1.7 3.0   0.5 -5.5   -0.9 5.7   1.0 -5.0   0.4 3.3   0.9
Std Dev 10.4   1.7 7.7   1.7 7.6   3.4 9.8   2.0 6.6   3.9 4.7   2.9



Updated: 04-02-25 at 4:55 pm
Goal Forecast Day Day +1 Day +2
± 2.0° F Low High Low High Low High
Date NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
04-02-25 46   35 37   65 67   47 46   60 61   41 39   46
04-01-25 48 27.2 26 26 47.8 50 49   35 34   64 67   45 48   59
03-31-25 35 37.0 36 48 72.6 48 26 27.2 28 50 47.8 50 35   37 69   66
03-30-25 44 42.1 42 44 45.0 66 67 37.0 38 36 72.6 48 51 27.2 28 25 47.8 50
03-29-25 37 36.0 37 51 54.8 50 44 42.1 44 66 45.0 65 37 37.0 37 47 72.6 46
03-28-25 55 45.1 42 43 59.3 54 62 36.0 41 37 54.8 55 50 42.1 49 44 45.0 64
03-27-25 47 27.1 32 32 50.1 56 55 45.1 41 43 59.3 72 70 36.0 49 42 54.8 55
03-26-25 26 24.1 24 47 49.0 46 31 27.1 33 53 50.1 54 40 45.1 40 63 59.3 60
03-25-25 50 25.9 27 28 52.8 44 45 24.1 26 26 49.0 48 48 27.1 29 31 50.1 54
03-24-25 40 32.2 34 31 42.1 46 52 25.9 27 29 52.8 45 46 24.1 24 26 49.0 48
03-23-25 39 29.8 29 29 40.8 41 46 32.2 32 31 42.1 47 48 25.9 27 28 52.8 43
03-22-25 56 23.3 21 21 59.9 44 42 29.8 30 28 40.8 45 49 32.2 33 31 42.1 47
03-21-25 45 23.2 28 28 48.0 56 56 23.3 21 20 59.9 45 41 29.8 31 27 40.8 49
03-20-25 32 33.4 33 48 65.3 45 29 23.2 31 53 48.0 52 23 23.3 23 43 59.9 46
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 5 9 2 1 2 7 0 2 2 8 1 3
% Succ 38.5   69.2 15.4   7.7 16.7   58.3     16.7 18.2   72.7 9.1   27.3
Ave Error 11.9   1.7 16.3   9.5 15.4   2.7 17.7   8.4 14.9   2.8 15.9   8.2
Net Error 11.4   0.4 -16.3   -3.2 15.2   1.6 -12.5   0.3 13.9   1.8 -15.2   -1.1
Std Dev 9.9   1.5 10.2   7.2 9.3   1.8 9.0   7.2 9.3   3.7 7.8   7.9



Updated: 04-02-25 at 7:55 pm
Goal Forecast Day Day +1 Day +2
± 2.0° F Low High Low High Low High
Date WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
04-02-25 55   35 78   64 66   47 73   59 44   42 54   46
04-01-25 55 36.5 26 78 47.8 50 66   35 73   63 44   46 54   59
03-31-25 55 35.7 37 78 72.6 48 66 36.5 27 73 47.8 51 44   37 54   64
03-30-25 55 54.2 42 78 45.0 68 66 35.7 38 73 72.6 49 44 36.5 29 54 47.8 49
03-29-25 55 42.0 36 78 54.8 48 66 54.2 43 73 45.0 65 44 35.7 38 54 72.6 46
03-28-25 55 36.4 43 78 59.3 54 66 42.0 40 73 54.8 49 44 54.2 44 54 45.0 64
03-27-25 55 50.3 32 78 50.1 55 66 36.4 41 73 59.3 71 44 42.0 48 54 54.8 51
03-26-25 55 28.8 23 78 49.0 46 66 50.3 32 73 50.1 53 44 36.4 41 54 59.3 70
03-25-25 55 32.7 26 78 52.8 43 66 28.8 25 73 49.0 47 44 50.3 31 54 50.1 54
03-24-25 55 31.5 33 78 42.1 46 66 32.7 26 73 52.8 44 44 28.8 25 54 49.0 47
03-23-25 55 37.2 28 78 40.8 40 66 31.5 33 73 42.1 47 44 32.7 27 54 52.8 43
03-22-25 55 30.7 19 78 59.9 43 66 37.2 29 73 40.8 43 44 31.5 33 54 42.1 46
03-21-25 55 33.7 28 78 48.0 56 66 30.7 21 73 59.9 45 44 37.2 31 54 40.8 49
03-20-25 55 37.2 34 78 65.3 45 66 33.7 31 73 48.0 52 44 30.7 23 54 59.9 46
Results WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
# Succ 1 2 0 1 0 2 1 1 1 1 2 2
% Succ 7.7   15.4     7.7     16.7 8.3   8.3 9.1   9.1 18.2   18.2
Ave Error 17.5   7.6 25.1   10.0 28.5   6.7 21.2   8.7 9.2   6.8 7.4   9.4
Net Error 17.5   -6.1 25.1   -3.5 28.5   -5.3 21.2   -0.5 6.2   -4.2 1.8   -0.8
Std Dev 7.1   4.4 8.2   7.5 7.1   4.5 8.1   6.7 3.1   4.3 4.6   7.2