EF-1 Tornado in McGregor

NWSChat – NOAA’s National Weather Service

NWS DAMAGE SURVEY FOR 07/19/2017 TORNADO EVENT...

OVERVIEW...A strong wind producing system moved through
northeast Iowa on the afternoon of July 20, 2017. Very 
isolated tornadoes occurred in association with this
system. 

A Tornado Warning was issued for northern Clayton county
including McGregor, IA at 5:54 pm.  


Rating:                 EF-1
Estimated peak wind:    110 mph
Path length /Statute/:  5.7 miles
Path width /Maximum/:   400 yards
Fatalities:             0 
Injuries:               2 - minor

Start date:             Jul 19 2017 
Start time:             6:08 pm 
Start location:         5 miles west of McGregor, IA 

End date:               Jul 19 2017 
End time:               6:16 pm 
End location:           McGregor, IA


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Posted under NOAA, Severe Weather

This post was written by Schnack on July 20, 2017

EF-1 Tornado Tuesday Evening

The National Weather Service has confirmed the tornado near Conroy Tuesday evening was rated an EF-1 with peak winds estimated at 105 mph.

So far, no reports of injuries.

3 miles NE of Williamsburg [Iowa Co.]

TORNADO of EF1 , 05:35 PM CDT Tuesday July 11. The tornado touched down northeast of Williamsburg and produced damage to mainly trees and crops along its 4.6 mile path. Its max width was 60 yards. Two houses sustained damage to windows and siding. One farm outbuilding lost part of its roof, and another was partially destroyed. The tornado lifted at 5:54 pm.

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Posted under Photo, Severe Weather

This post was written by Schnack on July 12, 2017

June 28th Tornadoes Across Eastern Iowa

June 28th was an active afternoon and evening across eastern Iowa, with several severe thunderstorm and tornado warnings across the KWWL viewing area.

Officially, there were four tornadoes confirmed in eastern Iowa.  The first one was the Central City/Prairieburg tornado, which the National Weather Service survey crews found produced EF-2 damage.

Storm Track 7 was tracking this tornado on Doppler Radar, and it was showing debris.  Below is the radar reflectivity, velocity, and tornado debris signature from around 6:50 PM, when the tornado was near heavily damaged Prairieburg.

The reds are the particles the radar is picking up moving away from the radar site (located in Davenport), and the greens are moving toward the site.  When you get them close together, that indicates rotation, and where the tornado was located.

This is the correlation coefficient, where we look for debris within the storm.  Basically, this is showing us the difference between meteorological properties, such as rain and hail (the warmer colors), and the non-meteorologist properties, such as dirt, tree branches, etc. (cooler colors).  You can see a clear sign of debris right over Prairieburg.

Tornado #2: North of Monticello

Tornado #3: Oxford Junction

A brief, weak tornado was caught on camera near Vinton.  Emergency management reports that there was minor damage to a machine shed.  The National Weather Service did not send a crew there, due to no other damage being reported.

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Posted under Severe Weather

This post was written by Kyle Kiel on July 2, 2017

Preliminary survey results from this morning: preliminary EF-2 rating for tornado path including Central City and Prairieburg. The National Weather Service survey crew will be back out tomorrow to complete the survey and report more specific findings.

 

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Posted under NOAA, Severe Weather

This post was written by Schnack on June 29, 2017

Strong Storms Possible Wednesday and Thursday

Welcome to the first full day of summer 2017. The season and the day started very tranquil. However, with a warm front approaching from the southwest through the day, things start to change up. Showers and storms move through the state this morning and possibly again for later in the day. Some of those storms may produce strong winds and large hail.

Winds increase in strength from a southerly direction. Dew points and humidity increase through the day, as well. Highs today reach near 80° closer to the Minnesota line to the mid-80s in our southern towns. A breezy afternoon is on the way.

Overnight lows will not cool much thanks to the increased humidity – only getting into the mid to upper 60s.

Humidity continues into Thursday. With us in the wake of the warm front Thursday and the higher humidity, it will feel like summer.  That does not last very long as a cold front will sweep through eastern Iowa tomorrow. That second front brings more storm possibilities to us…and potentially some strong to severe storms.

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Posted under Forecast Discussion, Severe Weather

This post was written by Rachael Peart on June 21, 2017

Severe Weather to our West

Active weather to our west this evening. No severe weather in eastern Iowa tonight. Storms late tonight should remain below severe limits.

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Posted under Severe Weather

This post was written by Schnack on June 13, 2017

Hot and Humid then Slight Risk Late Sunday Night

This stagnant weather pattern we have been in continues again today. A stationary front sticks around to the north and a front lingers to the west. In between those two boundaries, we have a continued flow of air from the southwest. The air that is flowing in from the southwest is very warm and quite humid.

If you were looking for a break from yesterday’s heat and humidity…today won’t be your day. Highs reach the low to mid-90s from north to south.

A strong southwesterly wind unfortunately does not provide much relief from the summer-like conditions.

The front that sits to our north could fire up a few storms in our extreme northern areas, but the bulk of the storms stay into Minnesota and Wisconsin.

Another humid evening is on the way across the area. Lows only fall to near 70° with breezy winds. A stray storm is possible overnight, as well. A few more clouds track in for Monday, which may keep it a couple of degrees cooler than Sunday. Temperatures still land above average for this time of year.

 

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Posted under Forecast Discussion, Records, Severe Weather, Temperatures

This post was written by Rachael Peart on June 11, 2017

Iowa’s First Photographed Tornado – 118 Years Ago

The first tornado to ever be caught on camera in the state of Iowa was captured on May 30, 1899.  It was taken in Kingsley around 7:30 in the evening. There were five tornadoes across the state that day.

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Posted under Photo, Severe Weather, Weather History

This post was written by Kyle Kiel on May 30, 2017

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Keokuk and Washington County Storm (Saturday)

Saturday turned out to be an interested weather day across eastern Iowa.  We started the day out with fog, then a mix of clouds and sun.  Rain and storms developed out in western Iowa and tracked into eastern Iowa this afternoon.  Then, a secondary batch of storms developed just west of the KWWL viewing area, and tracked east.

While the environment was not ripe across most of eastern Iowa for severe weather, the warm and muggy airmass over southern Iowa developed a severe thunderstorm that sparked at Tornado Warning for parts of Keokuk and Washington County.  Here’s a snapshot of the timeline of the storm.  The warning was issued as the storm was over What Cheer, and tracked east toward Sigourney.

   

Within 1 hour, the storm went from a rotating thunderstorm producing quarter to half-dollar size hail, torrential rainfall and lightning, to just a light shower.  The storm pretty much collapsed as it tracked through Keota, and into Washington County.

Half-dollar size hail was reported near Keota, while a funnel cloud and wall cloud was spotted near Richland (likely looking NW at the storm).  The National Weather Service reports that there were no confirmed touchdowns, nor were there any reports of damage, which is great news.

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Posted under Severe Weather

This post was written by Kyle Kiel on May 27, 2017

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Two EF-1 Tornadoes Wednesday

Lake Darling State Park Iowa…

RATING:                 EF-1
ESTIMATED PEAK WIND:    110 MPH
PATH LENGTH /STATUTE/:  3.27 MILES
PATH WIDTH /MAXIMUM/:   25 YARDS
FATALITIES:             0
INJURIES:               0

START DATE:             05/17/2017
START TIME:             416 PM CDT
START LOCATION:         3.85 Miles W Pleasant Plain/ Jefferson County/ Ia
START LAT/LON:          41.1453 N/ -91.9313 W

END DATE:               05/17/2017
END TIME:               420 PM CDT
END LOCATION:           1.39 Miles W lake Darling State Park/ Washington County/ Ia
END LAT/LON:            41.1924 N/ -91.9241

A rapidly moving EF-1 tornado moved almost due north damaging farm
outbuildings and trees.

Riverside…

RATING:                 EF-1
ESTIMATED PEAK WIND:    110 MPH
PATH LENGTH /STATUTE/:  5.95 MILES
PATH WIDTH /MAXIMUM/:   40 YARDS
FATALITIES:             0
INJURIES:               0

START DATE:             05/17/2017
START TIME:             636 PM CDT
START LOCATION:         7.31 Miles NE Washington/ Washington County/ Ia
START LAT/LON:          41.3838 N/-91.6021 W

END DATE:               05/17/2017
END TIME:               642 PM CDT
END LOCATION:           3.75 Miles SE Riverside/ Washington County/ Ia
END LAT/LON:            41.4455 N/-91.5219 W

An EF-1 tornado spun up and tracked rapidly to the northeast. The tornado
damaged numerous farm outbuildings, power lines, and trees along the path.

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE
FOLLOWING CATEGORIES BASED ON THE DAMAGE THEY CAUSE.

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

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Posted under Severe Weather

This post was written by Schnack on May 18, 2017