Lone Tree Tornado Rating EF0

1

NWS DAMAGE SURVEY FOR 04/13/14 TORNADO EVENT…

 

A SEMI-ISOLATED STORM ON THE SOUTHERN END OF
A LARGER THUNDERSTORM COMPLEX PRODUCED A BRIEF TORNADO.

 

LONE TREE TORNADO…

 

RATING:                 EF-0

ESTIMATED PEAK WIND:    65 MPH

PATH LENGTH /STATUTE/:  1 MILE

PATH WIDTH /MAXIMUM/:   25 YARDS

FATALITIES:             0

INJURIES:               0

 

START DATE:             APRIL 13…2014

START TIME:             5:56 PM CDT

START LOCATION:         .5 MILES WEST OF LONE TREE (JOHNSON COUNTY)

 

END DATE:               APRIL 13…2014

END TIME:               5:58 PM CDT

END LOCATION:           .5 MILES NORTH OF LONE TREE

 

SURVEY SUMMARY: A TEAM FROM THE NATIONAL WEATHER SERVICE QUAD CITIES FORECAST OFFICE SURVEYED THE AREA AROUND LONE TREE LATE THIS MORNING.  NO DAMAGE WAS FOUND.  PATH IS ESTIMATED FROM WITNESSES AND RADAR. SEVERAL WITNESSES DESCRIBED A FUNNEL THAT WENT UP AND DOWN NUMEROUS TIMES. PHOTO AND VIDEO DOCUMENTATION SHOW THAT THE TORNADO DID TOUCH DOWN AT LEAST BRIEFLY TO THE WEST AND NORTHWEST OF TOWN.

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE FOLLOWING

CATEGORIES.

EF0…WEAK……65 TO 85 MPH

EF1…WEAK……86 TO 110 MPH

EF2…STRONG….111 TO 135 MPH

EF3…STRONG….136 TO 165 MPH

EF4…VIOLENT…166 TO 200 MPH

EF5…VIOLENT…>200 MPH

 

NOTE: THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO

CHANGE PENDING FINAL REVIEW OF THE EVENT AND PUBLICATION IN NWS

Share

Posted under NOAA, Severe Weather

This post was written by Schnack on April 14, 2014

Hail Photos

Here are a few photos from the storms this afternoon. They developed very quickly in the Severe Thunderstorm Watch across northeast Iowa.

Share

Posted under Photo, Severe Weather

This post was written by Schnack on April 12, 2014

Severe Thunderstorm Watch Until 10 PM

2
URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 70
   NWS STORM PREDICTION CENTER NORMAN OK
   320 PM CDT SAT APR 12 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     CENTRAL AND NORTHEAST IOWA
     EXTREME NORTHWEST ILLINOIS
     SOUTHWEST WISCONSIN

   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
     1000 PM CDT.

   * PRIMARY THREATS INCLUDE...
     WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
       EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
     SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
       TO 75 MPH POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
   SOUTHWEST OF DENISON IOWA TO 10 MILES SOUTH SOUTHEAST OF MADISON
   WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.

   &&

   DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON
   AND EVENING ALONG A SURFACE BOUNDARY EXTENDING FROM
   CENTRAL/NORTHEAST IOWA INTO SOUTHERN WISCONSIN.  STORMS THAT FORM
   WILL LIKELY BECOME INTENSE WITH A RISK OF VERY LARGE HAIL AND
   DAMAGING WINDS.  ACTIVITY SHOULD SPREAD SOUTHEASTWARD ACROSS THE
   WATCH AREA THROUGH THE EVENING.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 25030.
Share

Posted under Severe Weather

This post was written by Schnack on April 12, 2014

Spotter Training Classes This Week

Spotter Class 2

 

Click image to enlarge

 

Share

Posted under NOAA, Severe Weather

This post was written by Schnack on March 16, 2014

Spotter Training Classes

Click on image to enlarge

Spotter Class 1

Spotter Class 2

Spotter Class 3

Share

Posted under Severe Weather

This post was written by Schnack on March 9, 2014

Tornado Outbreak Sunday

The tornado outbreak, that occurred on Sunday, November 17, 2013, was a rare event. When we talk about severe weather in November, the Midwest and Great Lakes don’t typically come to mind right away. Historically, tornadoes in November develop in the states along the Gulf of Mexico (see map below).

Nov 18 Nov Tornadoes

The maps below(click to enlarge) are the “Day 2″ forecast. The outlook map on the bottom right is for Sunday and was issued Saturday. It is very rare to have a moderate risk area as for north as it was. The map on the bottom left shows you the amount of times a moderate risk outlook is issued for “Day 2″ in November. Notice most of them are in the southeast matching up with the map above.

Nov 16 Severe Weather

The map below shows two things. The first one is the severe weather outlook for Day 1. The outlook issued Sunday morning. The dots on the map indicate where all of the severe weather was. The red dots are the tornado reports and fall pretty much into high risk area in Illinois and Indiana.

Nov 18 Reports vs Forecast

So I mentioned how rare moderate outlooks are in November now lets take a look the only two high risk outlooks issued in November since 1998. (see map below)

November-High_Risks

 

It is rare to have tornadoes in Iowa during the month of November, but it has happened. From 1980-2011 Iowa has had 22 tornadoes in November.
Nov 18 IA Tornadoes

 

As of this post the preliminary reports are that 76 tornadoes occurred in this outbreak. The two images below are from the tornado that went through Washington, IL. At this time is has been rated an EF 4. Click here for more information about the Washington, IL tornado.

Nov 18 IL Tornado

Nov 18 IL Tornado 2

Click here for more damage photos.

 

Despite all of the tornadoes on Sunday, we are still way below normal when it comes to tornadoes this year across the country. The total is now up to 886. The average, since 2005, is about 1,500 tornadoes. (see chart below)

Nov 18 torngraph-big

 

Click on the links below for other severe weather surveys from the NWS.

Indianapolis Forecast Office: Click here

Northern Indiana Forecast Office: Click here

Grand Rapids Forecast Office: Click here

St. Louis Forecast Office: Click here

Paducah Forecast Office: Click here

Nov 18 Tornado 3

 

Share

Posted under Severe Weather

This post was written by Schnack on November 18, 2013

Nebraska Tornado Friday

Share

Posted under Severe Weather, Video

This post was written by Schnack on October 4, 2013

Severe T-Storm Watch in Effect Until 5 AM Friday

Oct 3 NWS Watch

SEVERE THUNDERSTORM WATCH NUMBER 537
   NWS STORM PREDICTION CENTER NORMAN OK
   820 PM CDT THU OCT 3 2013

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     SOUTHERN AND CENTRAL IOWA
     NORTHERN MISSOURI
     EASTERN NEBRASKA

   * EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 820 PM
     UNTIL 500 AM CDT.

   * PRIMARY THREATS INCLUDE...
     NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
       EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE
     SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     A FEW TORNADOES POSSIBLE
Share

Posted under Severe Weather

This post was written by Schnack on October 3, 2013

Severe Weather Outlook Update

Severe weather threat for Friday afternoon & evening is increasing. Hail, high wind and isolated tornadoes possible between 1-7 PM. The position of the warm front and low as well as the amount of sunshine Friday will be crucial as to if and where the severe weather will be. I will have more information on the forecast blog post this afternoon.

Oct 3 IA SVR OUTLOOK

Share

Posted under Severe Weather

This post was written by Schnack on October 3, 2013

Severe Thunderstorm Watch Until Midnight

 

UPDATE: THE WATCH HAS BEEN CANCELLED FOR EASTERN IOWA AS OF 9:30 PM

Aug 6 ww0476_radar_big

SEVERE THUNDERSTORM WATCH NUMBER 476  
NWS STORM PREDICTION CENTER NORMAN OK  
655 PM CDT TUE AUG 6 2013  

THE NWS STORM PREDICTION CENTER HAS ISSUED A  

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF   
  SOUTHERN IOWA  
  A SMALL PART OF WEST CENTRAL AND NORTHWEST ILLINOIS  
  EXTREME NORTHEAST MISSOURI  
  EAST CENTRAL NEBRASKA  

* EFFECTIVE THIS TUESDAY NIGHT FROM 655 PM UNTIL MIDNIGHT CDT.  

* PRIMARY THREATS INCLUDE...  
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE  
  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE  

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45  
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH OF  
COLUMBUS NEBRASKA TO 35 MILES NORTH NORTHEAST OF BURLINGTON IOWA.  
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH  
OUTLINE UPDATE (WOUS64 KWNS WOU6).
Share

Posted under Severe Weather

This post was written by Schnack on August 6, 2013