EF0 tornado, Strasburg, Colorado, June 4, 2008

1. EF065 to 85 mphthis tornado

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

2. EF186 to 110 mph

   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

EF0

Date

June 4, 2008

Touchdown

3:04 PM MDT (21:04 UTC)

Path length

0.1 miles (0.2 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

County

Adams County

Touchdown point

39.990, -104.070

Lift-off point

39.990, -104.070

Record number

0806041504-01

Severe thunderstorms produced large hail up to the size of ping pong balls in the Arvada area, damaging automobiles. As the severe thunderstorms developed across the Northeast Plains, large hail, damaging winds and tornadoes were reported. Most of the wind damage occurred in Washington County, south of Akron. Strong thunderstorm winds reportedly blew down sheds and snapped six power poles; and a roof was partially taken off one house. Silos were also destroyed by the wind. Several cars in Otis had their windows shattered by hail. The windows of houses and buildings in the areas were also broken. Heavy rain associated with the storms also caused flash flooding in Morgan and northern Washington Counties. County officials reported 9 to 24 inches of water over many roadways in and around Fort Morgan and Brush. Heavy rain caused flooding along State Highway 71 south of Brush. Many farm fields were completely covered in water as Little Beaver Creek and numerous irrigation ditches had jumped their banks. A storm spotter near the intersection of County Roads 14 and P measured over 5 inches of rainfall.

A small tornado touched down but did no damage.

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

16 minutes of warning. NWS BOU issued a tornado warning for this county at 20:48 UTC, 16 minutes before the tornado touched down, in force until 21:30 UTC.

The county was under a tornado watch, issued at 18:43 UTC and running to 02:00 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, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 20:01 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.

Front Range (FTG), 46 km from the path, in the two hours either side.

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

The Denver radar (KFTG), 46 km away, was scanning. The volume nearest the touchdown began at 20:56 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.

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 2008 tornado in ColoradoEvery tornado in Colorado since 1950Warnings in force in Colorado nowThe forecast where you are

45 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.