Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >
Choose Element: | Click here for element descriptions |
Sustained Wind Speed | Descriptive Term |
---|---|
40 mph or greater | Strong, dangerous, or damaging |
30-40 mph | Very Windy |
20-30 mph | Windy |
15-25 mph | Breezy, Brisk, or Blustery |
5-15 mph or 10-20 mph | None |
0-5 mph | Light or light and variable wind |
Category | Classification | Heat Index/Apparent Temperature (°F) | General Affect on People in High Risk Groups |
---|---|---|---|
IV | Extremely Hot | 130°F or Higher | Heat/Sunstroke HIGHLY LIKELY with continued exposure |
III | Very Hot | 105°F - 130°F | Sunstroke, heat cramps, or heat exhaustion LIKELY, and heatstroke POSSIBLE with prolonged exposure and/or physical activity |
II | Hot | 90°F - 105°F | Sunstroke, heat cramps, or heat exhaustion POSSIBLE with prolonged exposure and/or physical activity |
I | Very Warm | 80°F - 90°F | Fatigue POSSIBLE with prolonged exposure and/or physical activity |
Lifted Index (LI) | Thunderstorm Indication |
---|---|
< -5 | Very Unstable, Heavy/strong thunderstorm potential |
-3 to -5 | Unstable, Thunderstorms probable |
0 to -2 | Marginally Unstable, Thunderstorms possible |