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

Rivaling Record Highs and Severe Storms Possible

After storms Monday evening, most of Tuesday will be pretty quiet. Partly to mostly cloudy conditions cover our skies. A front to our west will track very slowly to our area and that is why we keep cloud cover around. However, with us on the west side of the front, we’ll see strong southerly winds. Winds pull in more warm air and temperatures soar into the 80s and possibly low 90s (mainly along/south of I-80). Humid conditions will make it feel even warmer (hello heat index!).

Overnight, as the front tracks closer, we have the chance for showers and storms. Storms track through between 10pm and 2am Wednesday morning. Damaging straight line winds are the greatest threat, followed by hail and isolated tornadoes.

Scattered storms continue on Wednesday, some of which could be strong or severe. SPC issued a slight risk for all of eastern Iowa on Wednesday.

Check back for updates.

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Posted under Forecast Discussion, Records, Severe Weather, Temperatures

This post was written by Rachael Peart on May 16, 2017

EF-0 Tornado Monday evening

Widespread wind damage occurred across
northeast Iowa late on Monday May 15, 2017. West of
Calmar, Iowa damage to trees indicated the
likelihood of a very weak tornado versus straight-line
wind damage. The damage was seen along a broken path
running southeast from 265th Avenue to the southern
shore area of Lake Meyer.

THE LAKE MEYER TORNADO…

Rating:                 EF-0
Estimated peak wind:    70 mph
Path length /Statute/:  A broken, 1 mile path
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             May 15 2017
Start time:             6:45 pm
Start location:         2 miles SE Spillville, Iowa

End date:               May 15 2017
End time:               6:47 pm
End location:           2 miles SSW Calmar, Iowa

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

Here is a look at the radar from Monday evening.

Another radar image from NWS in La Crosse.

More details to come.

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Posted under Severe Weather

This post was written by Schnack on May 16, 2017

Risk of Severe Weather Monday

Parts of northeast Iowa are under an “enhanced” risk for severe weather today. That area of greatest concern extends south to near highway 20.  South of highway 20 to highway 30 is under a “slight” risk. All forms of severe weather are on the table today. Storms fire up along a warm front to our north through the day and into the evening, as well. Increased humidity today gives fuel to storms that move through.

With any passing storms, wind would be the biggest threat, followed by hail and isolated tornadoes. We’re not expecting much rain from storms today so flash flooding is not a concern.

Highs Monday and Tuesday warm to the 80s before we cool back into the 70s midweek.

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Posted under Forecast Discussion, Severe Weather

This post was written by Rachael Peart on May 15, 2017

EF-0 Tornado in Salem

NWS Damage Survey for 05/10/17 Tornado Event

Salem Iowa Tornado

RATING:                 EF-0
ESTIMATED PEAK WIND:    60 MPH
PATH LENGTH /STATUTE/:  0.91 miles
PATH WIDTH /MAXIMUM/:   20 yards
FATALITIES:             0
INJURIES:               0

START DATE:             05/10/2017 
START TIME:             256 PM CDT
START LOCATION:         2.3 W Salem / Henry / Iowa
START LAT/LON:          40.8519 / -91.6631

END DATE:               05/10/2017
END TIME:               259 PM CDT
END LOCATION:           1.4 W Salem / Henry / Iowa
END LAT/LON:            40.8528 / -91.6458 

Tornado touched down in a field and was on the ground for 
2-3 minutes. Flying dirt was observed but no damage was 
reported. 

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 NOAA, Severe Weather

This post was written by Schnack on May 11, 2017