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Rain and Ongoing Flood Concerns in Texas; Freezing Temperatures in the Midwest to the Northeast

Showers and storms will persist in Texas into the weekend with the heaviest rain focused over central Texas including the Hill Country where the threat for some flash flooding remains. Freezing temperatures are expected into the morning across the Great Lakes, Ohio Valley, and portions of the Mid-Mississippi Valley and the Northeast. Read More >

Overview

On the afternoon of November 11, 2015, a line of storms produced a series of tornadoes across the southern half of Iowa. Tornadoes were reported from as far west as Avoca to the Davenport area. These storms, moving at speeds of 50 to 60 mph at times, produced AT LEAST 10 tornadoes in central Iowa, with this number all but certain to increase in the coming days as additional information is collected. One small, short-lived tornado grazed the Des Moines International Airport and caused damage to some equipment at the airport and to the neighborhood to the north. Tornadoes also struck Knoxville, Barnes City, and around Rathbun Lake. Please note that the statistics below are very preliminary, and this page will be updated as new information arrives.

Additional areas of interest that will be evaluated for tornadoes in the coming days include:

  • Southern and Eastern Wayne County
  • Eastern Taylor, NW Ringgold, and SW Union Counties
  • Central Union County
  • North Central Ringgold County
  • Central Adams County around Corning
  • Southern Madison County
  • North Central Boone County
  • Eastern Marshall County
  • Southwest Jasper County
  • Northeast Des Moines

Tornado Statistics

Tornado #1 - 4.8 miles SW of Yale
Guthrie County

Date November 11, 2015
Time (Local) 2:58pm - 3:02pm
EF Rating EF-0
Est. Peak Winds 84 mph
Path Length 3.2 miles
Max Width 50 yards
Injuries/Deaths 0/0

Summary:

This weak tornado formed on the south shore of Lake Panorama, moving quickly to the NE and damage confined to trees and a grain bin.

Track Map

Track Map EF-Scale

Click Map for Larger Image

Tornado #2 - 7.3 miles NNW of Plano
Wayne, Appanoose & Monroe Counties

Date November 11, 2015
Time (Local) 3:20pm - 3:35pm
EF Rating EF-2
Est. Peak Winds 125 mph
Path Length 14.5 miles
Max Width 300 yards
Injuries/Deaths 0/0

Summary:

This longer-lived tornado developed from a strong supercell and tracked across Lake Rathbun, damaging numerous homes and farm buildings.

Track Map

Track Map EF-Scale

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Tornado #3 - Des Moines Airport
Polk County

Date November 11, 2015
Time (Local) 3:27pm - 3:31pm
EF Rating EF-0
Est. Peak Winds 75 mph
Path Length 2.9 miles
Max Width 30 yards
Injuries/Deaths 0/0

Summary:

This weak tornado grazed the Des Moines Airport, damaging some trailers at the National Guard base. Tree damage occurred in the neighborhood to the north of the airport with windows being knocked out of some buildings.

Track Map

Track Map EF-Scale

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Tornado #4 - Knoxville
Marion County

Date November 11, 2015
Time (Local) 3:43pm - 3:47pm
EF Rating EF-1
Est. Peak Winds 110 mph
Path Length 3.9 miles
Max Width 100 yards
Injuries/Deaths 1/0

Summary:

A high end EF-1 tornado moved through southeastern Knoxville, damaging the Wal-Mart on the south side of town and a number of houses on the east side of town.

Track Map

Track Map EF-Scale

Click Map for Larger Image

Tornado #5 - 3 miles SSW of Barnes City
Mahaska & Poweshiek Counties

Date November 11, 2015
Time (Local) 4:21pm - 4:29pm
EF Rating EF-2
Est. Peak Winds 112 mph
Path Length 6.2 miles
Max Width 125 yards
Injuries/Deaths 0/0

Summary:

This tornado rapidly developed SSW of Barnes City, damaging several farmsteads before tracking into the town, where more outbuildings were damaged or destroyed. Trees and powerlines were snapped along its path.

Track Map

Track Map EF-Scale

Click Map for Larger Image

Northwest of Adel
Dallas County

Date November 11, 2015
Time (Local) 2:59pm - 3:05pm
EF Rating EF-1
Est. Peak Winds 100 mph
Path Length 8.1 miles
Max Width 300 yards
Injuries/Deaths 0/0

Summary:

This tornado damaged multiple farmsteads along its track.

Track Map

Track Map EF-Scale

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West of Winterset
Madison County

Date November 11, 2015
Time (Local) 2:54pm - 3:04pm
EF Rating EF-1
Est. Peak Winds 87 mph
Path Length 9.8 miles
Max Width 50 yards
Injuries/Deaths 0/0

Summary:

This fast moving tornado damaged at least one farmstead west of Winterset and was captured on video by a storm chaser.

Track Map

Track Map EF-Scale

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Southeast of Macksburg
Madison County

Date November 11, 2015
Time (Local) 2:51pm - 2:57pm
EF Rating EF-0
Est. Peak Winds 65 mph
Path Length 5.7 miles
Max Width 20 yards
Injuries/Deaths 0/0

Summary:

This tornado damaged several corn fields and trees.

Track Map

Track Map EF-Scale

Click Map for Larger Image

North of Grand River
Decatur County

Date November 11, 2015
Time (Local) 2:59pm - 3:05pm
EF Rating EF-1
Est. Peak Winds 85 mph
Path Length 2.7 miles
Max Width 50 yards
Injuries/Deaths 0/0

Summary:

This tornado damaged trees and fields along its path.

Track Map

Track Map EF-Scale

Click Map for Larger Image

Southeast of Allerton
Wayne County

Date November 11, 2015
Time (Local) 2:55pm - 2:56pm
EF Rating EF-0
Est. Peak Winds 70 mph
Path Length 0.5 miles
Max Width 30 yards
Injuries/Deaths 0/0

Summary:

This narrow tornado was filmed by a storm chaser. No damage was reported.

Track Map

Track Map EF-Scale

Click Map for Larger Image

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0
Weak

65-85 mph
EF1
Moderate
86-110 mph
EF2
Significant
111-135 mph
EF3
Severe
136-165 mph
EF4
Extreme
166-200 mph
EF5
Catastrophic
Over 200 mph
EF-Scale

Photos & Video

Tornado #2 - Around Lake Rathbun (Appanoose and Monroe Counties)

Damage Photo Damage Photo Damage Photo
A house lost its roof just north of Lake Rathbun
(NWS Storm Survey)
A house lost part of its roof north of Lake Rathbun, with the garage completely gone
(NWS Storm Survey)
Many trees sustained heavy damage along the path
(NWS Storm Survey)
 

Tornado #4 - Knoxville (Marion County)

Damage Photo Damage Photo Damage Photo
Damaged roofing inside the Wal Mart in Knoxville
(NWS Storm Survey)
A home lost its roof on the east side of Knoxville
(NWS Storm Survey)
Tree damage on the east side of Knoxville
(NWS Storm Survey)
 

Tornado #5 - Barnes City (Mahaska & Poweshiek Counties)

Damage Photo Damage Photo Damage Photo
Debris strewn about southwest of Barnes City
(NWS Storm Survey)
Outbuildings destroyed in Barnes City
(NWS Storm Survey)
Additional damage in Barnes City
(NWS Storm Survey)
 

Radar Data

Tornado #1 - 4.8 miles SW of Yale (Guthrie County)

Radar Image Radar Image Radar Image
The classic hook shape appears in reflectivity around the time of touchdown. A very weak couplet on storm-relative velocity SW of Yale indicates the very narrow nature of the tornado. Shortly after lifting off, a faint depression appears in the correlation coefficient image (orange area west of Yale), signally the presence of dirt being lifted up by the tornado.

Tornado #2 - 6.5 miles NNW of Plano (Appanoose & Monroe Counties)

Radar Image Radar Image Radar Image
Reflectivity image during the tornado, showing the storm embedded in a line of other thunderstorms. Intense rotation during the peak of the tornado, as it was producing EF-2 damage. Maybe a satellite tornado to the SE? The tornado weakens later on its life, with the rotational couplet also becoming less pronounced.

Tornado #3 - Des Moines Airport (Polk County)

Radar Image Radar Image Radar Image
A hook echo appears on the backside of the line of thunderstorms, denoting the tornado as it hits the airport. A small couplet also marks the spot of the tornado over the Des Moines airport. As the tornado lifted, a depression in the correlation coefficient also appeared in the location of the hook (center of both split screen images), a tipoff that debris was being lofted upwards.

Tornado #4 - Knoxville (Marion County)

Radar Image Radar Image Radar Image
Reflectivity image during the tornado, showing the storm embedded in a line of other thunderstorms. A VERY narrow couplet near Knoxville is shows how narrow the tornado was. While a bit hard to see in the data noise, a tornadic debris signature shows up (green and blue colors) as the tornado hits Knoxville.

Tornado #5 - 2 miles SSW of Barnes City  (Mahaska & Poweshiek Counties)

Radar Image Radar Image Radar Image
Reflectivity image during the tornado, showing the storm embedded in a line of other thunderstorms. A broad area of rotation was the only indication on velocity that a tornado might be present. However, correlation coefficient revealed a stark TDS, proof that a tornado was occurring.

Wind Damage

Pockets of downburst wind damage were also found along the path of the storms. The NWS surveyed areas south of Knoxville and around the Prairie City area, finding only wind damage in these areas. Additional photos will be posted here in the coming days.

 
Radar/Photo Radar/Photo Radar/Photo
Damage to the Casey's in Prairie City
(NWS Storm Survey)
Tree Damage in Prairie City
(NWS Storm Survey)
Roof Panel Damage in Prairie City
(NWS Storm Survey)

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