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 Details for NW Suffolk Heat Advisory  +2 additional alerts
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 Suffolk
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WxSim & NWS Forecast Comparison

National Weather Service (NW), Actual Observed (Act), WxSim Generated (WS)
Morning Forecasts
Updated: 07-30-25 at 5:00 am
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° F High Low 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 NW Act WS NW Act WS
07-30-25 74   94 91   73 73   84 82   65 64   71 72   61 62   83 79   65
07-29-25 73 94.6 94 92 71.8 72 74   93 89   74 74   83 82   61 66   71 75   60
07-28-25 72 92.5 93 91 70.3 72 73 94.6 94 93 71.8 72 76   91 91   73 73   80 82   64
07-27-25 69 82.0 84 81 64.6 72 72 92.5 94 89 70.3 72 73 94.6 93 91 71.8 75 74   94 91   71
07-26-25 72 83.1 87 83 69.3 70 69 82.0 81 81 64.6 71 72 92.5 91 88 70.3 72 72 94.6 94 91 71.8 72
07-25-25 74 91.2 93 90 73.8 70 72 83.1 87 85 69.3 70 69 82.0 81 81 64.6 71 71 92.5 90 87 70.3 73
07-24-25 66 84.6 89 84 69.6 72 74 91.2 93 90 73.8 71 73 83.1 86 85 69.3 69 70 82.0 89 84 64.6 73
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 0 4 0 3 0 4 0 3 0 3 0 2 0 1 0 1
% Succ     66.7     50.0     80.0     60.0     75.0     50.0     33.3     33.3
Ave Error 17.0   2.2 16.9   2.7 16.7   1.8 17.6   2.4 16.3   1.8 17.3   2.9 18.7   3.4 18.4   3.8
Net Error -17.0   2.0 16.9   1.4 -16.7   1.1 17.6   1.2 -16.3   -0.3 17.3   2.8 -18.7   1.3 18.4   3.8
Std Dev 3.7   1.2 2.5   2.4 3.2   0.6 1.8   2.1 2.7   0.1 1.0   0.2 0.0   0.0 0.0   0.0

Mid-Day Forecasts
Updated: 07-29-25 at 11:00 am
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° F High Low 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 NW Act WS NW Act WS
07-29-25 92   98 74   73 89   93 74   74 82   82 66   64 75   71 64   61
07-28-25 72 92.5 95 91 71.8 74 73   94 93   72 76   91 91   72 73   82 82   65
07-27-25 81 82.0 84 72 70.3 71 89 92.5 93 73 71.8 72 91   93 74   74 91   94 73   71
07-26-25 83 83.1 88 69 64.6 72 81 82.0 85 72 70.3 71 88 92.5 92 72 71.8 73 91   93 74   74
07-25-25 90 91.2 95 72 69.3 71 85 83.1 87 69 64.6 71 81 82.0 82 71 70.3 71 87 92.5 90 73 71.8 71
07-24-25 84 84.6 89 74 73.8 72 90 91.2 92 73 69.3 72 85 83.1 86 70 64.6 70 84 82.0 90 72 70.3 72
07-23-25 82 83.7 87 70 69.6 67 83 84.6 88 73 73.8 72 90 91.2 93 74 69.3 71 85 83.1 86 71 64.6 69
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 5 1 3 3 4 2 3 3 3 3 2 3 2 0 2 2
% Succ 83.3   16.7 50.0   50.0 80.0   40.0 60.0   60.0 75.0   75.0 50.0   75.0 66.7   0.0 66.7   66.7
Ave Error 4.2   3.5 4.8   2.7 1.8   2.3 2.4   2.4 2.2   1.3 2.8   2.3 3.1   4.5 3.1   2.3
Net Error -4.2   3.5 4.8   1.3 -1.1   2.3 2.0   1.6 -1.2   1.1 2.8   2.3 -0.5   2.8 3.1   1.8
Std Dev 7.2   1.0 6.4   2.2 0.8   1.1 1.1   2.2 1.2   0.4 1.3   0.5 0.0   0.0 0.0   0.0

Evening Forecasts
Updated: 07-29-25 at 5:00 pm
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° F Low High 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 NW Act WS NW Act WS
07-29-25 93   73 73   93 92   74 73   81 82   63 64   71 72   60 62   83
07-28-25 93 71.8 72 74 92.5 94 93   72 76   91 91   73 72   82 82   65 66   80
07-27-25 80 70.3 70 72 82.0 93 91 71.8 71 74 92.5 93 92   74 77   94 90   72 73   79
07-26-25 83 64.6 66 68 83.1 80 81 70.3 71 72 82.0 93 89 71.8 72 72 92.5 92 92   74 74   94
07-25-25 72 69.3 71 84 91.2 86 71 64.6 70 80 83.1 82 71 70.3 71 87 82.0 91 73 71.8 73 91 92.5 93
07-24-25 84 73.8 70 74 84.6 93 90 69.3 72 73 91.2 87 85 64.6 70 70 83.1 85 83 70.3 71 72 82.0 88
07-23-25 82 69.6 66 66 83.7 88 84 73.8 71 74 84.6 93 90 69.3 72 74 91.2 85 84 64.6 70 70 83.1 90
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 0 4 0 1 0 2 0 2 1 2 0 2 1 2 1 1
% Succ     66.7     16.7     40.0     40.0 25.0   50.0     50.0 33.3   66.7 33.3   33.3
Ave Error 12.4   1.8 13.2   5.6 13.4   2.5 12.1   5.0 14.8   2.3 14.0   4.4 11.1   2.4 8.2   4.5
Net Error 12.4   -0.7 -13.2   2.8 13.4   1.0 -12.1   2.9 14.8   2.3 -11.5   1.1 11.1   2.4 -8.2   4.5
Std Dev 6.1   1.2 3.8   3.2 4.2   1.7 5.0   3.8 1.2   1.0 3.3   2.0 0.0   0.0 0.0   0.0

Nighttime Forecasts
Updated: 07-29-25 at 11:00 pm
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° F Low High 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 NW Act WS NW Act WS
07-29-25 73   74 92   94 73   73 82   82 64   62 72   71 62   60 79   82
07-28-25 93 71.8 72 74 92.5 94 93   72 76   92 91   72 72   83 82   62 66   75
07-27-25 72 70.3 72 91 82.0 95 74 71.8 72 92 92.5 94 77   73 90   93 73   72 84   80
07-26-25 69 64.6 65 81 83.1 82 72 70.3 72 89 82.0 93 72 71.8 73 92 92.5 93 74   74 90   94
07-25-25 72 69.3 71 84 91.2 87 71 64.6 71 80 83.1 83 71 70.3 72 87 82.0 91 73 71.8 72 91 92.5 95
07-24-25 84 73.8 72 74 84.6 94 90 69.3 71 73 91.2 87 85 64.6 71 70 83.1 85 83 70.3 71 72 82.0 90
07-23-25 82 69.6 69 66 83.7 89 84 73.8 72 74 84.6 94 90 69.3 71 74 91.2 88 84 64.6 70 70 83.1 90
Results NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS NW Act WS
# Succ 1 6 0 2 1 4 1 2 2 3 1 2 1 2 1 0
% Succ 16.7   100.0     33.3 20.0   80.0 20.0   40.0 50.0   75.0 25.0   50.0 33.3   66.7 33.3   0.0
Ave Error 8.8   1.1 10.9   5.8 8.2   2.4 7.9   5.2 10.5   2.8 9.0   3.7 11.1   2.1 8.2   5.8
Net Error 8.8   0.3 -7.9   4.0 8.2   1.6 -5.1   3.5 10.5   2.8 -6.5   2.1 11.1   2.1 -8.2   5.8
Std Dev 6.6   0.7 5.0   4.2 4.1   2.1 4.0   3.8 5.2   0.8 4.2   1.6 0.0   0.0 0.0   0.0