EF1 tornado, Upham, North Dakota, June 22, 2007

1. EF065 to 85 mph

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

2. EF186 to 110 mphthis tornado

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

3. EF2111 to 135 mph

   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. EF3136 to 165 mph

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

5. EF4166 to 200 mph

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

6. EF5over 200 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

EF1

Date

June 22, 2007

Touchdown

7:30 PM CDT (00:30 UTC)

Lifted

7:45 PM CDT (00:45 UTC)

On the ground

15 minutes

Path length

0.5 miles (0.8 km)

Path width

250 yards (229 m)

Deaths

0

Injuries

0

Property damage

$100,000

County

McHenry County

Touchdown point

48.493, -100.720

Lift-off point

48.486, -100.720

Record number

0706221830-01

In the mid afternoon of Friday June 22nd, Severe Thunderstorm Watch 445 was issued in anticipation of severe thunderstorms developing along a surface boundary over western North Dakota. Numerous severe thunderstorm warnings along with a few tornado warnings were issued. Numerous reports of large hail and one confirmed tornado report were received during the late afternoon and evening hours.

The tornado damage path was 1/2 mile from the intersection of 7th Avenue North and 74th Street North, 6 mile south of Upham, toward the southeast. The damage width was 250 yards. Damage was mainly to trees and outbuildings on one farm property, and corresponded to an EF1 rating on the Enhanced Fujita Scale. From this rating, wind speeds were determined to be on the order of 100 mph. Some specific damage included 3 to 4 foot diameter trees uprooted, roof torn off of chicken coop, and a large barn kinked on its foundation.

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

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down. One was issued for the county at another hour that day.

The county was under a severe thunderstorm watch, issued at 21:35 UTC and running to 04:00 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 20:02 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.

Minot_afb (MIB), 48 km from the path, in the two hours either side.

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

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2007 tornado in North DakotaEvery tornado in North Dakota since 1950Warnings in force in North Dakota nowThe forecast where you are

4 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.