National Weather Service State College, PA Weather Impact Matrix for Northumberland County Decision Support Valid: 09/23/2025 08 AM - 09/23/2025 08 PM EDT

Tue 09/23 8 AM Tue 09/23 9 AM Tue 09/23 10 AM Tue 09/23 11 AM Tue 09/23 12 PM Tue 09/23 1 PM Tue 09/23 2 PM Tue 09/23 3 PM Tue 09/23 4 PM Tue 09/23 5 PM Tue 09/23 6 PM Tue 09/23 7 PM Tue 09/23 8 PM Temperature 64°F 67°F 70°F 72°F 74°F 76°F 78°F 78°F 78°F 76°F 75°F 73°F 70°F Heat Index 63°F 66°F 70°F 73°F 76°F 77°F 78°F 82°F 78°F 77°F 76°F 73°F 70°F Wind Speed 3 mph 3 mph 3 mph 4 mph 4 mph 5 mph 5 mph 5 mph 5 mph 5 mph 4 mph 3 mph 2 mph Wind Direction S S S S SW SW SW SW SW SW SW SW SW Wind Gust 6 mph 8 mph 8 mph 9 mph 10 mph 11 mph 12 mph 11 mph 10 mph 9 mph 11 mph 10 mph 8 mph Chance of Precipitation 7% 9% 12% 16% 26% 39% 54% 80% 84% 67% 56% 38% 47% Weather None None None Rain Rain Rain Rain Thunder Rain Thunder Rain Thunder Rain Thunder Rain Thunder Rain Thunder Rain Thunder Sky Cover 79% 76% 71% 67% 71% 74% 77% 80% 84% 83% 80% 77% 75% Relative Humidity 99% 95% 87% 81% 75% 71% 71% 70% 70% 75% 76% 82% 92% Rainfall 0.01 in 0.01 in 0.01 in 0.01 in 0.01 in 0.01 in 0.03 in 0.03 in 0.03 in 0.03 in 0.03 in 0.03 in 0.01 in Issued: Tuesday September 23, 2025 04:58 AM EDT

Threat Level	None	Limited	Elevated	Significant	Extreme
Temperature	≤80 °F	80 to 89 °F	90 to 94 °F	95 to 99 °F	≥100 °F
Heat Index	≤80 °F	80 to 89 °F	90 to 94 °F	95 to 99 °F	≥100 °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

Note -

Grey color indicates no thresholds assigned