F2 tornado, St Libory, Nebraska, May 2, 1999

1. F040 to 72 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. F173 to 112 mph

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. F2113 to 157 mphthis tornado

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. F3158 to 206 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. F4207 to 260 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. F5261 to 318 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

F2

Date

May 2, 1999

Touchdown

8:06 PM CDT (01:06 UTC)

Path length

11.0 miles (17.7 km)

Path width

0 yards (0 m)

Deaths

0

Injuries

0

Property damage

$250,000

Counties

Merrick and Howard counties

Touchdown point

41.080, -98.230

Lift-off point

41.170, -98.250

Record number

1009

As strong low pressure lifted across Nebraska and Kansas, a series of damaging tornadoes ripped across south-central Nebraska during the late afternoon and evening hours. No less than 10 tornadoes were confirmed across an area from west of Arapahoe to north of Grand Island near St. Libory. Tornado damage began around mid-afternoon near Holbrook. A brief tornado did some damage to a farmstead northwest of town. Another tornado set down in southern Gosper county and damaged or destroyed at least 3 irrigation center pivots. Tornadoes touched down near Ragan and west of Wilcox. Eventually, another twister near Macon hit two farms. With debris flying through the air, one man stood on his front porch as the tornado passed. Outbuildings, center pivots, and grain bins were heavily damaged by this tornado.Just after 6 pm, the first of three tornadoes in Adams county took aim on the region west of Kenesaw. Shortly thereafter, another tornado set down southeast of Kenesaw and moved northeast. One farm sustained damage southeast of Kenesaw as irrigation pipe littered the fields along the twister's path. Both tornadoes were on the ground at the same time. A third tornado set down west of Juniata but did no damage before lifting.Around 7 pm, a short lived tornado was observed just northwest of Wood River. This tornado destroyed grain bins, damaged a grain dryer and pulled shingles from a house nearby. Strong winds in the region also downed power lines and poles south of town. Finally, just after 8 pm, the final tornado of the evening set down in extreme western Merrick county and moved north just inside the Howard county line. This F2, multiple vortex tornado was on the ground for about 5 miles and damaged or destroyed numerous outbuildings and trees along its path.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

1 minute of warning. NWS GID issued a tornado warning for this county at 01:05 UTC, 1 minute before the tornado touched down, in force until 01:45 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a Slight Risk. The outlook in force was issued at 00:45 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

Grand Island (GRI), 18 km from the path, in the two hours either side.

From the Iowa Environmental Mesonet's archive of airport observations.

The Grand Island radar (KUEX), 91 km away, was scanning. The volume nearest the touchdown began at 01:04 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

The live radar over the trackEvery 1999 tornado in NebraskaEvery tornado in Nebraska since 1950Warnings in force in Nebraska nowThe forecast where you are

9 more were confirmed in the United States that day.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.