A line of severe thunderstorms moved across northeast Iowa during the afternoon of June 30th. These storms primarily produced damaging winds with trees and power lines blown down from near Osage (Mitchell County) southeast to near Strawberry Point (Clayton County).
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ARX wrote it up.
A line of severe thunderstorms moved across northeast Iowa during the afternoon of June 30th. These storms primarily produced damaging winds with trees and power lines blown down from near Osage (Mitchell County) southeast to near Strawberry Point (Clayton County). Lots of trees and power lines were blown down across much of Winneshiek County, the southern half of Allamakee County and the northern sections of Fayette County. A 65 mph wind gust occurred near Fredericksburg (Chickasaw County).
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS La Crosse, WI wrote its last area forecast discussion before the first event at Jun 30, 1:11 PM CST, 1 hour 37 minutes earlier.
Area Forecast Discussion
National Weather Service La Crosse WI
211 PM CDT Sun Jun 30 2019
.SHORT TERM...(This evening through Monday)
Issued at 210 PM CDT Sun Jun 30 2019
Convection has quickly reformed early this afternoon across
eastern Minnesota into northern Wisconsin ahead of yet another
short wave trough moving across the top of the upper level ridge.
The lower levels of the atmosphere have not recovered quickly in
the wake of the earlier morning convection, but MUCAPES are in
the 1000-1500 J/Kg range. The latest runs of the HRRR seem to have
a good handle on this activity and continue to move it southeast
along the edge of the MUCAPE gradient and it should clear the
eastern parts of the area by late this afternoon.
This activity should help to reinforce the synoptic front that
looks to extend from southwest Minnesota into southern Wisconsin.
This front is not expected to move much, if at all overnight, and
likely will be the focus for additional development overnight.
Several runs of the RAP have been showing a moderate band of
frontogenesis to exist along the front. As the low level jet gets
going and intersects the boundary, the RAP and HRRR all show a
band of convection oriented from central Minnesota into southern
Wisconsin, developing overnight. With precipitable water amounts
near 2 inches and warm cloud depths of 4 km or so, concerned that
this overnight activity will be heavy rain producers with the rain
falling over ground that is already saturated by the rains of the
last couple of days. A flash flood watch is looking more likely
for areas generally along and north of Interstate 90. This
activity should then begin to diminish/move off to the east after
sunrise with the diurnal decay of the low level jet.
Unfortunately, it does not look like the synoptic front is going
to move much and should still be near the vicinity for Monday
afternoon. By mid to late afternoon, the RAP is showing the
moisture transport axis redeveloping back into the front over
southern and central Minnesota with another round of convection
forming. Along with the continued heavy rain threat, this activity
could also have a damaging wind threat. ML CAPES may recover back
into the 2000-3000 J/Kg range with the potential of 40 to 50 knots
of shear in the 0-6 km layer.
.LONG TERM...(Monday night through Sunday)
Issued at 210 PM CDT Sun Jun 30 2019
No large scale pattern change looks to occur over the upcoming
week. A flat upper level ridge will remain over the central part
of the country with troughing over the western conus and over
central Canada. The two long wave troughs will push several short
wave troughs across the flat ridge and over the Upper Midwest. The
surface boundary will get pushed around some by convective
complexes, but in the big picture, it will remain over the region.
As the short wave troughs cross the region, they will interact
with the front and likely cause additional convective complexes to
form. This will necessitate the inclusion of rain chances everyday
into next weekend. Depending on where the convective complexes
form and how much rain is dropped, the concern for additional
flooding remains elevated.
&&
.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 1229 PM CDT Sun Jun 30 2019
Much uncertainty exists with how the convection is going to play
out during the next 24 hours. This is due to the CAMs not handling
the existing convection. For this afternoon, thinking the line of
storms near the Twin Cities will drop southward into the TAF
sites. It should reach KRST around 30.20z and KLSE around 30.21z.
These storms should last 2 to 3 hours. Main threat with these
storms will be heavy rain and gusty winds.
For tonight, not sure how this is going to play out. If the
storms, move more down the I-94 corridor this afternoon than there
would likely be redevelopment near the Mississippi River. If this
bows further west, than much of the redevelopment would be west
and south of the TAF sites.
&&
.ARX WATCHES/WARNINGS/ADVISORIES...
WI...Heat Advisory until 9 PM CDT this evening for WIZ061.
MN...Heat Advisory until 9 PM CDT this evening for MNZ079-086>088-
094>096.
IA...Heat Advisory until 9 PM CDT this evening for IAZ008>011-018-019-
029-030.
&&
SHORT TERM...04
LONG TERM...04
AVIATION...BoyneHazardous Weather Outlook National Weather Service La Crosse WI 1129 AM CDT Sun Jun 30 2019 WIZ017-029-032>034-041>044-053>055-011100- Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau- Adams-Vernon-Crawford-Richland- 1129 AM CDT Sun Jun 30 2019 This Hazardous Weather Outlook is for portions of central Wisconsin...north central Wisconsin...southwest Wisconsin and west central Wisconsin. .DAY ONE...This Afternoon and Tonight Afternoon heat index readings will range from 95 to 100 degrees. Thunderstorms are possible again later this afternoon and tonight. Some of the thunderstorms could become severe with a threat for damaging winds, heavy rain which may lead to flooding, and possibly some large hail. A Flash Flood Watch may be needed. .DAYS TWO THROUGH SEVEN...Monday through Saturday Additional thunderstorm chances will be found Monday through Saturday. An ongoing risk will be for heavy rainfall and flash flooding where repeat storms occur. It is too early to determine the risk for severe storms during this time. .SPOTTER INFORMATION STATEMENT... Spotter activation could be needed later today and this evening. In addition, rainfall reports are always appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ061-011100- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-Grant- 1129 AM CDT Sun Jun 30 2019 This Hazardous Weather Outlook is for portions of north central Iowa...northeast Iowa...southeast Minnesota and southwest Wisconsin. .DAY ONE...This Afternoon and Tonight A Heat Advisory is in effect through mid-evening. Afternoon heat index readings will range from 100 to 105 degrees. Thunderstorms are possible again later this afternoon and tonight. Some of the thunderstorms could become severe with a threat for damaging winds, heavy rain which may lead to flooding, and possibly some large hail. A Flash Flood Watch may be needed. .DAYS TWO THROUGH SEVEN...Monday through Saturday Additional thunderstorm chances will be found Monday through Saturday. An ongoing risk will be for heavy rainfall and flash flooding where repeat storms occur. It is too early to determine the risk for severe storms during this time. .SPOTTER INFORMATION STATEMENT... Spotter activation could be needed later today and this evening. In addition, rainfall reports are always appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. 04
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
321 PM CDT SUN JUN 30 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0311 PM TSTM WND GST 3 W LYLE 43.51N 93.01W
06/30/2019 E50 MPH MOWER MN LAW ENFORCEMENT
&&
CAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
323 PM CDT SUN JUN 30 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0320 PM HAIL HOLMEN 43.96N 91.26W
06/30/2019 E0.75 INCH LA CROSSE WI TRAINED SPOTTER
DIME TO PENNY SIZED HAIL.
&&
CAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
328 PM CDT SUN JUN 30 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0325 PM TSTM WND GST 1 N ONALASKA 43.90N 91.23W
06/30/2019 M47 MPH LA CROSSE WI TRAINED SPOTTER
&&
CAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
329 PM CDT SUN JUN 30 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0328 PM TSTM WND DMG LYLE 43.51N 92.94W
06/30/2019 MOWER MN TRAINED SPOTTER
TREE BLOWN DOWN.
&&
CASpecial Weather Statement
National Weather Service La Crosse WI
336 PM CDT Sun Jun 30 2019
IAZ011-MNZ096-WIZ041-042-053>055-302145-
Allamakee-Houston-Richland-Vernon-La Crosse-Crawford-Monroe-
336 PM CDT Sun Jun 30 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT PORTIONS OF
SOUTHEAST MINNESOTA...NORTHEAST IOWA...AND SOUTHWEST WISCONSIN...
At 334 PM CDT, radar indicated strong thunderstorms were located
along a line extending from Wonewoc to near Spring Grove. Movement
was southeast at 50 mph.
Wind gusts up to 50 mph and penny size hail are possible with these
storms.
Locations impacted include...
La Crosse, Sparta, Prairie Du Chien, Richland Center, La Crescent,
Viroqua, Waukon, Caledonia, Lansing, Onalaska, West Salem, Boscobel,
Westby, Bangor, Hillsboro, Spring Grove, Cashton, Stoddard, Coon
Valley and La Farge.
If outdoors, consider seeking shelter inside a building.
LAT...LON 4321 9029 4320 9044 4321 9055 4317 9069
4312 9074 4306 9094 4299 9106 4300 9113
4299 9116 4308 9118 4308 9130 4337 9161
4350 9161 4357 9172 4370 9173 4397 9091
4370 9031 4356 9031 4355 9019 4317 9019
TIME...MOT...LOC 2034Z 297DEG 45KT 4366 9024 4348 9166
CASpecial Weather Statement
National Weather Service La Crosse WI
346 PM CDT Sun Jun 30 2019
IAZ010-011-302145-
Winneshiek-Allamakee-
346 PM CDT Sun Jun 30 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN ALLAMAKEE
AND WINNESHIEK COUNTIES...
At 346 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 10 miles southeast of Mabel to near
Cresco. Movement was south at 25 mph.
Wind gusts up to 50 mph and penny size hail are possible with these
storms.
Locations impacted include...
Decorah, Waukon, Postville, Calmar, Ossian, Spillville, Fort
Atkinson, Ridgeway, Hardin, Castalia, Jackson Junction, and Volney.
If outdoors, consider seeking shelter inside a building.
LAT...LON 4308 9208 4350 9208 4350 9160 4337 9160
4308 9129
TIME...MOT...LOC 2046Z 353DEG 23KT 4341 9163 4336 9206
CAThe La Crosse radar (KARX), 142 km away, was scanning. The volume nearest the first event began at 20:50 UTC.
19 thunderstorm wind. Local standard time, as filed.
Trees were blown down north of Osage.
Trees were blown down in Cresco.
Trees were blown down south of Davis Corners and a roof was blown off of a unknown building type.
Some shingles were blown off a building.
Tree branches were snapped in New Hampton.
A large tree was snapped in Calmar.
A 65 mph wind gust was measured by a private weather station just east of Fredericksburg.
Lots of trees and power lines were blown down across the northern part of the county.
Trees were blown down in Monona.
Lots of trees were blown down across the entire county.
A tree was blown down on State Highway 76 between Marquette and Effigy Mounds National Monument.
Some trees and power lines were blown down across the northern part of the county, including in Randalia.
A large metal building sustained severe roof damage near Randalia. Boards from the damaged building were driven into a nearby shed.
Trees were blown down west of Farmersburg.
A tree limb was blown down onto a house east of Charles City.
Trees were blown down near Garnavillo.
Numerous power lines and tree branches were blown down in Oelwein, especially on the northeast side of town.
An estimated 60 mph wind gust snapped off a tree just west of Strawberry Point.
A tree, between 12 and 24 inches in diameter, was snapped off east of Oelwein.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2019Every state in 2019This day in weather historyWarnings in Iowa, June 2019
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 835358, 835359, 835360, 835364, 835365, 835370, 835368, 835384, 835372, 835381, 835379, 835388, 835618, 835390, 835391, 835392, 835396, 835397, 835398.