New Hampshire, 2024Flash Flood and Hail in New Hampshire, May 21, 2024
May 21, 2024 · NWS GYX · 7 events in 3 counties and zones
An unseasonably hot and humid airmass brought unstable conditions to southern New Hampshire as high pressure to the east allowed warm air from the southwest to move into the region. A weak mid-level disturbance triggered storms to develop by mid-afternoon across southern and central New Hampshire.
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 7
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
An unseasonably hot and humid airmass brought unstable conditions to southern New Hampshire as high pressure to the east allowed warm air from the southwest to move into the region. A weak mid-level disturbance triggered storms to develop by mid-afternoon across southern and central New Hampshire. A few of the storms became severe downing trees along with some large hail.
Event by event
3 hail, 3 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Hail, Sullivan
- When
- May 21, 3:42 PM EST to 3:45 PM EST
- Where
- Sullivan County, 2.07 mi S of Charlestown
- Measured
- 1.25 in hail
- Reported by
- Storm Chaser
- Coordinates
- 43.220, -72.430
A severe thunderstorm dropped half dollar size hail south of Charlestown, NH.
Thunderstorm Wind, Sullivan
- When
- May 21, 4:09 PM EST to 4:14 PM EST
- Where
- Sullivan County, 2.94 mi SSE of East Acworth
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- State Official
- Coordinates
- 43.190, -72.210
Outflow wind gusts from a severe thunderstorm downed a tree that caused blocked traffic south of Lempster.
Hail, Cheshire
- When
- May 21, 4:10 PM EST to 4:15 PM EST
- Where
- Cheshire County, 0.86 mi SW of North Walpole
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 43.140, -72.440
A severe thunderstorm dropped hail the size of quarters in North Walpole, NH.
Thunderstorm Wind, Cheshire
- When
- May 21, 4:20 PM EST to 4:24 PM EST
- Where
- Cheshire County, 0.5 mi E of Alstead
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Trained Spotter
- Coordinates
- 43.150, -72.360
Outflow winds from a severe thunderstorm downed a tree that blocked parts of Rt. 123 in Alstead.
Flash Flood, Cheshire
- When
- May 21, 5:00 PM EST to 6:00 PM EST
- Where
- Cheshire County, 1.8 mi ESE of Drewsville to 1.76 mi WSW of Alstead Center
- Cause
- Heavy Rain
- Reported by
- State Official
- Coordinates
- 43.118, -72.369
Heavy rain caused a washout on Homestead Road in southern Alstead.
Thunderstorm Wind, Hillsborough
- When
- May 21, 5:30 PM EST to 5:35 PM EST
- Where
- Hillsborough County, 1.52 mi E of Maplewood
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Trained Spotter
- Coordinates
- 43.030, -71.690
Outflow winds from a severe thunderstorm downed numerous branches and a few trees on Route 77 south of Weare, NH.
Hail, Hillsborough
- When
- May 21, 5:56 PM EST to 5:59 PM EST
- Where
- Hillsborough County, Shirley Hill
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 43.020, -71.580
A severe thunderstorm dropped hail the size of quarters in Goffstown, NH.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Tornadoes in Iowa, May 21, 20245 deaths · 39 injured · $42 million · EF4 · 14 events
- Tornadoes and Flash Flooding in Texas, May 21 to 22, 202430 injured · $6.4 million · EF2 · 100 events
- Tornado and Flash Flooding in Texas, May 21 to 23, 2024EF3 · 51 events
- Tornadoes and Hail in Oklahoma, May 21, 2024$2.7 million · EF1 · 63 events
- Tornadoes and Flood in Wisconsin, May 21, 2024$1.5 million · EF1 · 68 events
- Tornadoes and Hail in Wisconsin, May 21, 2024$3.3 million · EF1 · 40 events
- Tornado and Hail in Minnesota, May 21, 2024$996,000 · EF1 · 22 events
- Damaging Winds in Iowa, May 21, 2024$411,000 · 65 kt wind · 7 events
- Hail and Damaging Winds in Iowa, May 21, 20241.75 in hail · 65 events
- Tornadoes and Damaging Winds in Wisconsin, May 21, 2024$15,000 · EF1 · 27 events
- Excessive Heat and Heat in Texas, May 21 to 25, 202453 events
- Dust Storm in Illinois, May 21, 20246 injured · 4 events
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1184866, 1184877, 1184874, 1184879, 1187999, 1184881, 1184875.