New Hampshire, 2001

Flash Flooding in New Hampshire, March 22 to 23, 2001

March 22 to 23, 2001 · NWS GYX · 5 events in 3 counties and zones

The coastal storm that brought heavy snow to northern and central New Hampshire dropped 2 to 5 inches of rain in the southern part of the state. Small rivers and streams overflowed their banks.

Where it happened

Every event with a place to put it; 5 filed by county or forecast zone are drawn at its center, in a lighter ring. 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

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
5

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.

What happened

The episode as NWS GYX wrote it up.

The coastal storm that brought heavy snow to northern and central New Hampshire dropped 2 to 5 inches of rain in the southern part of the state. Small rivers and streams overflowed their banks. Melting snow also contributed to the runoff problem. Storm drains were overburdened causing some sewer systems to back up. Many washouts were also reported as the water flowed down the shoulders of the roads due to the high snow banks.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before the first event at Mar 22, 9:43 AM EST, 3 hours 17 minutes earlier.

Area forecast discussion, Mar 22, 9:43 AM EST, 3 hours 17 minutes before
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The radar

The Boston radar (KBOX), 115 km away, was scanning. The volume nearest the first event began at 18:02 UTC.

Open the radar archive at this moment

Event by event

5 flash flood. Local standard time, as filed.

Flash Flood, Rockingham

When
March 22, 1:00 PM EST to March 23, 6:00 AM EST
Where
Rockingham County, Countywide
Reported by
OFFICIAL NWS OBS.
Coordinates
42.985, -71.089 (the zone’s center; the record gives no point)

Flash Flood, Merrimack

When
March 22, 1:00 PM EST to March 23, 6:00 AM EST
Where
Merrimack County, Countywide
Reported by
OFFICIAL NWS OBS.
Coordinates
43.298, -71.680 (the zone’s center; the record gives no point)

Flash Flood, Strafford

When
March 22, 2:00 PM EST to March 23, 6:00 AM EST
Where
Strafford County, Dover
Reported by
OFFICIAL NWS OBS.
Coordinates
43.297, -71.029 (the zone’s center; the record gives no point)

Flash Flood, Strafford

When
March 22, 2:00 PM EST to March 23, 6:00 AM EST
Where
Strafford County, Durham
Reported by
OFFICIAL NWS OBS.
Coordinates
43.297, -71.029 (the zone’s center; the record gives no point)

Flash Flood, Strafford

When
March 22, 2:00 PM EST to March 23, 6:00 AM EST
Where
Strafford County, Rochester
Reported by
OFFICIAL NWS OBS.
Coordinates
43.297, -71.029 (the zone’s center; the record gives no point)

What these are

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.

The same day elsewhere

More

Every storm in New Hampshire in 2001Every state in 2001This day in weather historyWarnings in New Hampshire, March 2001

Sources

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: 5237165, 5237166, 5237167, 5237168, 5237169.