Tornadoes and Hail in Colorado, May 1, 1977

Name: Tornadoes and Hail in Colorado, May 1, 1977
Start: 1977-05-01T14:50
End: 1977-05-01T20:00
Location: Colorado

May 1, 1977 · 5 events in 3 counties and zones

4 tornado, 1 hail, as filed by the National Weather Service.

Where it happened

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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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.

Event by event

4 tornado, 1 hail. Local standard time, as filed.

Hail, Larimer

When: May 1, 2:50 PM CST
Where: Larimer County
Measured: 1.75 in hail
Coordinates: 40.580, -105.080

Tornado, Weld

When: May 1, 3:00 PM CST
Where: Weld County
Rating: F1
Path length: 0.1 mi
Path width: 80 yd
Coordinates: 40.480, -104.650

Tornado, Prowers

When: May 1, 7:55 PM CST
Where: Prowers County
Rating: F1
Path length: 0.1 mi
Path width: 80 yd
Coordinates: 38.070, -102.530

Tornado, Prowers

When: May 1, 8:00 PM CST
Where: Prowers County
Rating: F1
Path length: 0.1 mi
Path width: 80 yd
Coordinates: 38.080, -102.530

Tornado, Prowers

When: May 1, 8:00 PM CST
Where: Prowers County
Rating: F1
Path length: 0.1 mi
Path width: 80 yd
Coordinates: 38.080, -102.530

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Colorado in 1977 Every state in 1977 This day in weather history The tornado archive for Colorado, 1977

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 2026-09-24. Each event’s entry at NCEI: 9987485, 9987486, 9987487, 9987488, 9987489.