Navigation

External Links

Alerts

NW Suffolk
 Details for NW Suffolk Winter Storm Watch  +1 additional alert
 SW Suffolk
 Details for SW Suffolk Winter Storm Watch  +1 additional alert
 NE Suffolk
 Details for NE Suffolk Winter Storm Watch  +1 additional alert
 SE Suffolk
 Details for SE Suffolk Winter Storm Watch  +1 additional alert
 Suffolk
 Details for Suffolk Winter Storm Watch  +3 additional alerts
 Nassau
 Details for Nassau Winter Storm Watch  +2 additional alerts

Style Options




WxSim & NWS Forecast Comparison

National Weather Service (NW), Actual Observed (Act), WxSim Generated (WS)
Morning Forecasts
Updated: 02-20-26 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
02-20-26 36   43 54   34 37   49 58   30 45   41 64   26 47   37 66   24
02-19-26 39 43.0 45 50 33.8 33 35   43 53   34 37   49 58   28 46   42 63   31
02-18-26 36 40.8 44 51 25.5 32 38 43.0 46 49 33.8 33 34   45 54   34 36   48 57   32
02-17-26 41 37.8 47 52 21.6 33 37 40.8 46 51 25.5 34 39 43.0 43 52 33.8 33 36   45 55   34
02-16-26 46 41.4 45 53 29.5 30 41 37.8 47 51 21.6 33 37 40.8 45 52 25.5 32 39 43.0 42 52 33.8 32
02-15-26 47 41.4 43 59 21.6 28 46 41.4 44 53 29.5 31 42 37.8 47 51 21.6 32 37 40.8 41 52 25.5 31
02-14-26 43 47.1 45 60 16.2 26 46 41.4 43 59 21.6 29 44 41.4 42 54 29.5 26 42 37.8 44 51 21.6 33
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 2 0 2 0 1 0 2 0 2 0 1 0 2 0 1
% Succ     33.3     33.3     20.0     40.0     50.0     25.0     66.7     33.3
Ave Error 4.4   3.6 29.5   5.9 4.2   4.3 26.2   5.9 3.7   3.5 24.7   5.3 4.0   2.5 24.7   6.2
Net Error 0.1   2.9 29.5   5.6 0.7   4.3 26.2   5.6 -0.2   3.5 24.7   3.2 -1.2   1.8 24.7   5.0
Std Dev 0.7   2.5 7.0   3.8 0.6   2.3 5.1   3.5 0.2   1.8 3.2   2.3 0.0   0.0 0.0   0.0

Mid-Day Forecasts
Updated: 02-20-26 at 12:00 pm
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
02-20-26 54   44 37   34 58   49 45   31 64   39 47   27 66   37 52   22
02-19-26 50 43.0 48 35 34.7 35 53   44 37   34 58   48 46   29 63   41 50   30
02-18-26 50 40.8 44 41 33.8 32 50 43.0 45 34 34.7 33 54   44 37   34 57   47 46   30
02-16-26 53 37.8 45 41 25.5 31 51 40.8 47 37 33.8 33 52 43.0 46 39 34.7 31 52   45 36   33
02-15-26 59 41.4 48 46 29.5 29 53 37.8 46 42 25.5 31 51 40.8 47 37 33.8 32 52 43.0 44 39 34.7 31
02-14-26 60 47.1 48 46 21.6 28 59 41.4 44 44 29.5 28 54 37.8 42 42 25.5 27 51 40.8 44 38 33.8 32
02-13-26 64 40.5 41 42 16.2 25 61 47.1 44 46 21.6 25 58 41.4 44 46 29.5 29 55 37.8 45 42 25.5 29
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 2 1 3 0 1 1 3 0 0 0 3 0 1 0 1
% Succ     33.3 16.7   50.0     20.0 20.0   60.0     0.0     75.0     33.3     33.3
Ave Error 14.2   3.9 15.0   3.9 12.8   4.4 11.9   2.6 13.0   4.0 10.1   1.9 12.1   3.8 8.3   3.0
Net Error 14.2   3.9 15.0   3.1 12.8   3.2 11.6   1.0 13.0   4.0 10.1   -1.1 12.1   3.8 8.3   -0.7
Std Dev 3.9   2.2 7.8   2.5 3.0   2.2 6.6   1.6 2.0   0.5 2.9   0.9 0.0   0.0 0.0   0.0

Evening Forecasts
Updated: 02-20-26 at 6:00 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
02-20-26 54   34 37   49 59   31 44   40 65   27 45   37 68   25 52   34
02-19-26 50 34.7 34 36 43.0 45 53   35 37   49 57   29 45   39 64   28 48   37
02-18-26 51 33.8 32 39 40.8 45 50 34.7 33 35 43.0 44 54   33 37   47 57   29 46   41
02-17-26 52 25.5 33 36 37.8 45 51 33.8 32 38 40.8 44 49 34.7 33 34 43.0 45 54   34 36   49
02-16-26 53 21.6 32 41 41.4 48 52 25.5 34 37 37.8 45 51 33.8 32 39 40.8 45 52 34.7 32 36 43.0 43
02-15-26 59 29.5 27 46 41.4 44 53 21.6 30 42 41.4 47 51 25.5 34 37 37.8 43 52 33.8 33 39 40.8 42
02-14-26 60 21.6 28 47 47.1 44 59 29.5 30 45 41.4 43 53 21.6 30 42 41.4 46 51 25.5 30 38 37.8 43
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 2 4 1 0 3 2 2 0 2 3 1 0 1 2 2
% Succ     33.3 66.7   16.7     60.0 40.0   40.0     50.0 75.0   25.0     33.3 66.7   66.7
Ave Error 26.4   4.9 2.6   4.3 24.0   4.2 3.2   3.7 22.1   5.1 3.1   4.0 20.3   2.7 3.0   2.1
Net Error 26.4   3.2 -1.1   3.3 24.0   2.8 -1.5   3.7 22.1   3.4 -2.8   4.0 20.3   0.3 -2.9   2.1
Std Dev 6.4   3.4 2.2   1.9 5.1   2.5 2.4   2.0 3.9   1.7 3.0   1.0 0.0   0.0 0.0   0.0

Nighttime Forecasts
Updated: 02-20-26 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
02-20-26 37   32 59   47 44   30 65   38 45   25 68   35 52   24 63   34
02-19-26 36 34.7 33 53 43.0 44 37   34 57   49 45   30 64   40 48   26 66   36
02-18-26 39 33.8 33 50 40.8 44 35 34.7 32 54 43.0 42 37   33 57   47 46   29 60   40
02-17-26 36 25.5 25 51 37.8 43 38 33.8 32 49 40.8 45 34 34.7 34 54 43.0 44 36   34 57   46
02-16-26 41 21.6 21 52 41.4 47 37 25.5 33 51 37.8 46 39 33.8 33 52 40.8 46 36 34.7 34 55 43.0 45
02-15-26 46 29.5 29 53 41.4 46 42 21.6 31 51 41.4 48 37 25.5 34 52 37.8 45 39 33.8 32 52 40.8 42
02-14-26 47 21.6 22 59 47.1 41 45 29.5 28 53 41.4 44 42 21.6 31 51 41.4 49 38 25.5 30 53 37.8 42
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 1 1 2 0 1 1 2 0 1 1 2 0 2
% Succ 16.7   100.0     16.7 20.0   40.0     20.0 25.0   50.0     25.0 33.3   66.7     66.7
Ave Error 13.1   0.8 11.1   4.3 10.4   4.6 10.7   4.5 9.5   4.9 11.5   5.3 6.3   2.3 12.8   2.5
Net Error 13.1   -0.6 11.1   2.3 10.4   2.2 10.7   4.1 9.1   4.1 11.5   5.3 6.3   0.7 12.8   2.5
Std Dev 6.6   0.4 1.3   1.6 5.3   2.0 1.6   2.3 4.4   2.1 0.3   2.1 0.0   0.0 0.0   0.0