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

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Posted under NOAA, Severe Weather

This post was written by Schnack on April 14, 2014

April and Spring Outlook

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Posted under Long Range Outlook, NOAA

This post was written by Schnack on March 20, 2014

Spotter Training Classes This Week

Spotter Class 2

 

Click image to enlarge

 

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Posted under NOAA, Severe Weather

This post was written by Schnack on March 16, 2014

Earliest Snow of the Season

In September 24-26, 1942, a storm system brought rain and snow to Iowa.  This would also be the earliest snow for many locations. All of the snow reports for eastern Iowa were after midnight making the official earliest first snow September 26, 1942.
Waterloo: Trace
Dubuque: Trace
Cedar Rapids: 0.5″

The images below are the monthly reports that are filled out with the daily weather conditions. The first image is the official NWS site at Waterloo.
Click images to enlarge.

Sep 26 Snow ALO

The image below is from the river gauge site in Waterloo.

Sep 26 ALO River Report

The image below is for Cedar Rapids.

Sep 26 Snow CID

The image below is for Dubuque. This Dubuque report was at LD11 not at the Dubuque Airport.

Sep 26 DBQ Snow

 

The National Weather Service in Des Moines posted this in their weather history section about the storm.

On This Day in Iowa Weather History

September 25

1942: A powerful storm system brought a remarkable early snowfall to most of Iowa. Although the snow melted as it fell across most of the state many stations reported their earliest trace of snowfall on record, and in north central Iowa slightly cooler temperatures near the surface allowed the snow to accumulate to as much as 4.0 inches at Allison, Forest City, and Mason City. In portions of eastern Iowa the snow fell so rapidly that it accumulated faster than it could melt resulting in a brief 4.0 inch accumulation at Millerton. At many of the locations where measurable accumulations did occur the wet, heavy snow stuck to wires and trees that were still in full leaf. Many branches and trees were reported down around Centerville, Forest City, Mason City, and Millerton and telephone and electric services were disrupted around Estherville and Mason City. Two men from Calmar were killed on Highway 9 near Cresco when a tree fell in front of their truck. At Des Moines a trace of snow was reported at the airport on the 25th and 0.3 inches of snow was measured at the city office downtown, making this the earliest measurable snowfall on record in the city of Des Moines. In fact 1881, 1942, and 1985 are the only three years in which snow has ever been recorded at Des Moines in the month of September.

The National Weather Service in La Crosse posted this in their weather history section:

September 26 1942 Winona, MN (25, coldest September temperature). Also on this date, Caledonia, MN (5″) and Fayette, IA (1″), and La Crosse, WI (0.2″) had their earliest measurable snowfall. Snow fell in early morning, mostly melting as it fell.

Click on the image below for a more detailed look at this winter storm.

Sep 26 Snow Map

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Posted under NOAA, Weather History, Winter Weather

This post was written by Schnack on September 26, 2013

August Outlook

 

 

The Climate Prediction Center outlook for August is out. Below normal temperatures are forecast for Iowa with near normal precipitation.

July 31 August Outlook

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Posted under Long Range Outlook, NOAA

This post was written by Schnack on July 31, 2013

Preliminary Damage Assessment on 5 Tornadoes

The NWS survey team has been busy today after severe weather producing tornadoes  ripped through Iowa on Wednesday afternoon and evening. The preliminary assessment is that five tornadoes touched down in Wright and Franklin Counties. This number may go up as they continue to finalize the details. There also may be some adjustment to the details, but as of this time here is the information they have about the tornadoes. Click on the chart below to enlarge.

June 13 Tornadoes

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Posted under NOAA, Severe Weather

This post was written by Schnack on June 13, 2013

A Look Inside NWS Quad Cities

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Posted under NOAA, Photo

This post was written by Schnack on April 12, 2013

A Dry Week but Rain Possible for Weekend


UPDATED at 4:00 PM

Tonight: Clear and chilly. Low: 17-21. Wind: NW 5-10 mph.

Tuesday: Mostly sunny and warmer. High: NW 38-46. Wind: NW 10-15 mph.

Tuesday Night: Clear and chilly. Low: 17-20. Wind: NE 5-10 mph.

Wednesday: Mostly sunny. High: near 50.

Thursday: Partly cloudy. High: upper 50s.

Friday: Mostly cloudy. High: upper 50s.

Saturday: Mostly cloudy with a 20% chance of rain. High: upper 50s.

Sunday: Mostly cloudy with a 20% chance of rain. High: low 50s.

Monday: Mostly  cloudy with a 20% chance of rain. High: low 50s.

There are no in-person spotter training classes this week. There is just a webinar class.

Wednesday
April 3
7:00 p.m. Anywhere Webinar Click here for information

Training from surrounding NWS offices:

 

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Posted under Forecast Discussion, NOAA

This post was written by Schnack on April 1, 2013

We are Tracking Rain for the Weekend


UPDATED at 4:20 PM

Tonight: Mostly clear. Low: 25-29. Wind: SE 5 mph.

Friday: Partly cloudy. High: 48-54. Wind: SE 5-10 mph.

Friday Night: Increasing clouds. Low: 32-35. Wind: S 5 mph.

Saturday: Cloudy with a 70% chance of rain. High: upper 40s.

Sunday: Mostly cloudy and breezy (NW 10-20 mph). High: mid-upper 40s.

Monday: Mostly cloudy, breezy (NW 10-20 mph) and colder. High: mid-upper 30s.

Tuesday: Mostly sunny and breezy (NW 10-20 mph). High: near 40.

Wednesday: Partly cloudy. High: mid 40s.

Thursday: Partly cloudy. High: low 50s.

There are a two storm spotter training classes left this week.

Thursday March 28 6:30 p.m. Grant Fennimore, WI Fennimore Fire Station
Thursday March 28 6:30 p.m. Hardin Alden Public Library

Training from surrounding NWS offices:

It is nice to see some locations today reach a high in the low 50s. High temperatures tomorrow will be a few degrees warmer than today. Clouds will increase Friday night as we continue to track the chance of rain for Saturday. Scattered rain showers are expected mainly in the afternoon. Here is the rain forecast from Friday evening to Saturday evening.

Mar 28 QPF
Sunday will be mostly with a gusty northwest wind behind the cold front. The colder air will start to move south during the afternoon with temperatures slowly falling in the afternoon. Monday will be much colder. So much for spring weather sticking around more than week. Monday and Tuesday will be cold with high temperatures in the mid to upper 30s. Monday will be the colder of the two days. The gusty northwest wind will make it feel that much colder. Take a look at the 850 mb map for Monday afternoon. The temperatures at about 5,000 ft will be 15-16 degrees Celsius below zero. That is some cold air for this time of year.

Mar 28 850 mb temps
After this cold bump in the road temperatures will rebound back to the mid 40s Wednesday and low 50s Thursday. The temperatures bouncing up and down from day to day in the spring is normal.

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Posted under Forecast Discussion, NOAA

This post was written by Schnack on March 28, 2013

Feeling More Like Spring


UPDATED at 4:10 PM

Tonight: Mostly clear. Low: 20-25. Wind: NE 5 mph.

Thursday: Mostly sunny. High: 43-48. Wind: SE 5-10 mph.

Thursday Night: Partly cloudy. Low: 26-29. Wind: SE 5 mph.

Friday: Partly cloudy. High: upper 40s and low 50s.

Saturday: Mostly cloudy with a 50% chance of rain. High: low-mid 50s.

Sunday: Mostly cloudy and breezy (NW 10-20 mph) with a 20% chance of rain. High: upper 40s.

Monday: Mostly cloudy and breezy (NW 10-20 mph). High: low 40s.

Tuesday: Mostly sunny and breezy (NW 10-20 mph). High: low 40s.

Wednesday: Mostly sunny and breezy (SW 10-20 mph). High: mid 40s.

There are a two storm spotter training classes left this week.

Thursday March 28 6:30 p.m. Grant Fennimore, WI Fennimore Fire Station
Thursday March 28 6:30 p.m. Hardin Alden Public Library

Training from surrounding NWS offices:

People are starting to be friendlier today with warmer weather. The trend for warmer weather continues into the weekend. High pressure is slow to move and will have an influence on our weather with sunshine and a light wind through Friday. The map below is the WPC forecast map for 1 pm Thursday.

Mar 27 SFC map
High temperatures Friday will be near 50 degrees as the wind remains light. A few more clouds can be expected, but otherwise a beautiful spring day. We are still tracking the chance of rain for the weekend. The best chance of rain will be Saturday as the cold front pushes through the state in the afternoon. Rain amounts could be as high as 0.50” in some locations. Here is the rain forecast by WPC from Wednesday evening to Monday evening.

Mar 27 QPF
There is a secondary front forecast to move south through Iowa Monday morning. The front will have lots of clouds with it. Colder air is forecast to move south for Monday and Tuesday as high temperatures are going to be back into the upper 30s to low 40s. Here is the WPC forecast map for Monday morning.

Mar 27 Mon AM Sfc
High pressure moves south from Canada with dry and cool weather for the middle of next week.

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Posted under Forecast Discussion, NOAA

This post was written by Schnack on March 27, 2013