National Weather Service State College, PA Weather Impact Matrix for York County Decision Support Valid: 04/21/2026 04 PM - 04/22/2026 12 AM EDT

Tue 04/21 4 PM Tue 04/21 5 PM Tue 04/21 6 PM Tue 04/21 7 PM Tue 04/21 8 PM Tue 04/21 9 PM Tue 04/21 10 PM Tue 04/21 11 PM Wed 04/22 12 AM Temperature 56°F 58°F 59°F 57°F 54°F 51°F 50°F 50°F 49°F Wind Chill 57°F 58°F 59°F 57°F 54°F 51°F 47°F 47°F 44°F Wind Speed 5 mph 5 mph 5 mph 5 mph 5 mph 6 mph 6 mph 8 mph 8 mph Wind Direction SW S S S SE SE S S S Wind Gust 12 mph 13 mph 13 mph 12 mph 13 mph 14 mph 16 mph 16 mph 17 mph Chance of Precipitation 1% 1% 2% 3% 8% 4% 2% 2% 3% Weather None None None None None None None None None Sky Cover 10% 18% 25% 41% 49% 69% 75% 82% 72% Relative Humidity 34% 33% 33% 35% 42% 48% 50% 50% 55% Rainfall 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in Snow Accumulation 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in Ice Accumulation 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in 0.0 in Issued: Tuesday April 21, 2026 03:40 PM EDT

Threat Level	None	Limited	Elevated	Significant	Extreme
Temperature	≥10 °F	10 to 1 °F	0 to -9 °F	-10 to -24 °F	≤-25 °F
Wind Chill	≥10 °F	10 to 1 °F	0 to -9 °F	-10 to -24 °F	≤-25 °F
Wind Speed	≤10 mph	10 to 14 mph	15 to 24 mph	25 to 34 mph	≥35 mph
Wind Gust	≤15 mph	15 to 24 mph	25 to 34 mph	35 to 44 mph	≥45 mph
Chance of Precipitation	≤15 %	15 to 24 %	25 to 54 %	55 to 74 %	≥75 %
Relative Humidity	≥15 %	15 to 21 %	20 to 31 %	30 to 41 %	≤40 %
Rainfall	≤0.1 in	0.1 to 0.24 in	0.25 to 0.49 in	0.5 to 0.99 in	≥1.0 in
Snow Accumulation	≤0.1 in	0.1 to 0.9 in	1.0 to 2.9 in	3.0 to 5.9 in	≥6.0 in
Ice Accumulation	≤0.01 in	0.01 to 0.09 in	0.1 to 0.24 in	0.25 to 0.49 in	≥0.5 in

Note -

Grey color indicates no thresholds assigned