Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 34, NWS La Crosse, WI

June 28, 20194 counties in Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 28, 2019, 5:47 AM CDT for 4 counties in Iowa. It was in force for 58 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 28, 2019, 5:47 AM CDT (10:47 UTC)
Expired: Jun 28, 2019, 6:45 AM CDT
In force: 58 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Winneshiek County, IA

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 10:47 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 28, 6:08 AM CDT	HAIL 0.88	West Union, IA
Jun 28, 6:15 AM CDT	HAIL 0.88	Fayette, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.8 hours before the alert went out and 157 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 529 J/kg
Mixed-layer CIN: -295 J/kg
Mixed-layer LCL: 1667 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

277 
WUUS53 KARX 281047
SVRARX
IAC037-043-065-191-281145-
/O.NEW.KARX.SV.W.0034.190628T1047Z-190628T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
547 AM CDT Fri Jun 28 2019

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Clayton County in northeastern Iowa...
  Fayette County in northeastern Iowa...
  Southern Winneshiek County in northeastern Iowa...
  Southeastern Chickasaw County in northeastern Iowa...

* Until 645 AM CDT.

* At 547 AM CDT, severe thunderstorms were located along a line
  extending from 12 miles northwest of Boscobel to near Clermont to
  near New Hampton, moving south at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Postville and Clermont around 550 AM CDT.
  Elgin around 555 AM CDT.
  Fredericksburg around 620 AM CDT.
  Elkader around 625 AM CDT.
  Volga around 630 AM CDT.
  Strawberry Point around 645 AM CDT.

Other locations impacted by these severe thunderstorms include
Mederville, Randalia, Giard, Highways 3 And 187, Watson, Turkey River
and Bixby State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4264 9208 4291 9208 4291 9224 4310 9233
      4308 9118 4291 9114 4288 9110 4275 9107
      4269 9097 4268 9091 4265 9090
TIME...MOT...LOC 1047Z 341DEG 17KT 4325 9090 4302 9159 4311 9229 

HAIL...1.00IN
WIND...60MPH
 
$$

Lawrence

3 follow-up statements

927 
WWUS53 KARX 281106
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
606 AM CDT Fri Jun 28 2019

IAC037-043-065-191-281145-
/O.CON.KARX.SV.W.0034.000000T0000Z-190628T1145Z/
Clayton IA-Fayette IA-Winneshiek IA-Chickasaw IA-
606 AM CDT Fri Jun 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 AM CDT
FOR CLAYTON...FAYETTE...SOUTHERN WINNESHIEK AND SOUTHEASTERN
CHICKASAW COUNTIES...

At 605 AM CDT, severe thunderstorms were located along a line
extending from 6 miles west of Boscobel to near Elgin to near New
Hampton, moving south at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

These severe storms will be near...
  Elgin around 610 AM CDT.
  Volga around 625 AM CDT.
  Arlington around 635 AM CDT.
  Strawberry Point around 645 AM CDT.

Other locations impacted by these severe thunderstorms include
Mederville, Randalia, Giard, Highways 3 And 187, Watson, Turkey River
and Bixby State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4264 9208 4291 9208 4291 9224 4310 9233
      4308 9118 4291 9114 4288 9110 4275 9107
      4269 9097 4268 9091 4265 9090
TIME...MOT...LOC 1105Z 353DEG 20KT 4317 9083 4291 9163 4303 9229 

HAIL...1.00IN
WIND...60MPH
 
$$

Lawrence

254 
WWUS53 KARX 281125
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
625 AM CDT Fri Jun 28 2019

IAC191-281135-
/O.CAN.KARX.SV.W.0034.000000T0000Z-190628T1145Z/
Winneshiek IA-
625 AM CDT Fri Jun 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WINNESHIEK COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the 
area. Therefore, the warning has been cancelled.

LAT...LON 4292 9224 4299 9226 4295 9165 4308 9118
      4291 9114 4288 9110 4275 9107 4269 9097
      4268 9091 4265 9090 4264 9208 4291 9208
      4291 9224
TIME...MOT...LOC 1125Z 355DEG 23KT 4300 9082 4274 9162 4286 9228 

$$

IAC037-043-065-281145-
/O.CON.KARX.SV.W.0034.000000T0000Z-190628T1145Z/
Clayton IA-Fayette IA-Chickasaw IA-
625 AM CDT Fri Jun 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 AM CDT
FOR CLAYTON...FAYETTE AND SOUTHEASTERN CHICKASAW COUNTIES...

At 625 AM CDT, severe thunderstorms were located along a line
extending from 8 miles west of Fennimore to near Arlington to near
Tripoli, moving south at 25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Arlington and Volga around 630 AM CDT.
  Strawberry Point around 635 AM CDT.

Other locations impacted by these severe thunderstorms include
Mederville, Randalia, Giard, Highways 3 And 187, Turkey River, Bixby
State Park and Highway 13 And County C 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4292 9224 4299 9226 4295 9165 4308 9118
      4291 9114 4288 9110 4275 9107 4269 9097
      4268 9091 4265 9090 4264 9208 4291 9208
      4291 9224
TIME...MOT...LOC 1125Z 355DEG 23KT 4300 9082 4274 9162 4286 9228 

HAIL...0.75IN
WIND...60MPH
 
$$

Lawrence

948 
WWUS53 KARX 281142
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
642 AM CDT Fri Jun 28 2019

IAC037-043-065-281152-
/O.EXP.KARX.SV.W.0034.000000T0000Z-190628T1145Z/
Clayton IA-Fayette IA-Chickasaw IA-
642 AM CDT Fri Jun 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR CLAYTON...FAYETTE AND
SOUTHEASTERN CHICKASAW COUNTIES WILL EXPIRE AT 645 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds to 40 mph are still possible with these thunderstorms.

LAT...LON 4292 9224 4299 9226 4295 9165 4308 9118
      4291 9114 4288 9110 4275 9107 4269 9097
      4268 9091 4265 9090 4264 9208 4291 9208
      4291 9224
TIME...MOT...LOC 1142Z 341DEG 17KT 4294 9079 4268 9159 4280 9225 

$$

Lawrence

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jun 28, 2:31 AM CDT, 3 hours 16 minutes earlier.

Area forecast discussion, Jun 28, 2:31 AM CDT, 3 hours 16 minutes before

Area Forecast Discussion
National Weather Service La Crosse WI
231 AM CDT Fri Jun 28 2019

.SHORT TERM...(Today through Saturday Night)
Issued at 231 AM CDT Fri Jun 28 2019

Currently, a broken line of thunderstorms associated with a mid
level shortwave trough/weak surface boundary was working
southeastward through the area early this morning. Otherwise,
temperatures as of 2 am were holding in the mid 60s to near 70.

For today, that weak surface boundary will be hovering across
central IA into southern WI. Models showing an impressive CAPE pool
in place south of this boundary with 0-3km MUCAPE values up to 5-6
kJ/kg. RAP Bufkit indicating cap eroding/auto-convecting in the
vicinity of this frontal boundary south of I-90. Fortunately, bulk
shear will be rather weak in the 15-20kt range and wet bulb zero up
around 13kft (warmer -melting bigger hailstones as they fall). So,
thinking we'll see scattered thunderstorms firing mainly south of I-
90 this afternoon with a few possibly containing up to quarter-size
hail and strong/gusty winds. CAMs show this convection moving south
and dying off later this evening with loss of surface heating.
Otherwise, a warm and increasingly humid day on tap for today with
highs topping off well into the 80s and dew points in the mid 60s to
lower 70s. This will push heat indices into the upper 80s to mid
90s.

Partly cloudy/quiet conditions expected Friday night with lows in
the 60s/lower 70s.

Mid/upper level ridge amplifies over the region Saturday, warming
temperatures into the mid 80s/lower 90s. These temperatures combined
with dewpoints in the upper 60s to lower 70s will produce heat
indices in the 90s to near 100.

Models show an MCS moving through the Northern Plains/northern MN
Saturday night -staying north of the area. Otherwise, fairly muggy
night with lows only dropping into the mid 60s/lower 70s along with
similar dew points.

.LONG TERM...(Sunday through Thursday)
Issued at 231 AM CDT Fri Jun 28 2019

Sunday could be a tricky forecast as the NAM/GFS show an MCS rolling
southeast into the area (north of I-94). This could throw a wrench
into our temperature forecast if cloud cover/scattered convection
decide to linger through the day. Model consensus yielding highs in
the upper 80s to the lower 90s, but will have to keep a close eye on
how MCS pans out.

A cold front pushes southeast into the area Sunday night/Monday for
a good  chance of thunderstorms. Will have to watch for the
possibility of severe storms as well with higher cape values in the
2.5-4 Kj/Kg range and bulk shear of 25-35kt.

Upper level ridge flattens out through the rest of the period with
several waves rippling through the more high-zonal flow. This will
keep shower/thunder chances in with near normal early July
temperatures.

&&

.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1222 AM CDT Fri Jun 28 2019

SHRA/TS associated with a weak frontal boundary working through
the area early tonight. This activity should be clear of the area
after 09z. Scattered SHRA/TS expected to fire again this afternoon along
the frontal boundary to the south. Thinking bulk of this activity
will remain south of KRST/KLSE. Otherwise, beside some occasional
MVFR conditions through 09z, VFR conditions expected through the
remainder of the period.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
IA...None.
&&

SHORT TERM...DAS
LONG TERM...DAS
AVIATION...DAS

Hazardous weather outlook, Jun 28, 4:08 AM CDT, 1 hour 39 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
408 AM CDT Fri Jun 28 2019

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-291100-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
408 AM CDT Fri Jun 28 2019

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...Today and Tonight

Scattered thunderstorms will continue today mainly along and
south of I-90. A few of these storms will be capable of large
hail and strong to damaging winds. In addition, these storms will
be capable of heavy rainfall which could lead to some localized
flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There will be on and off chances for thunderstorms from Sunday
afternoon through Thursday. At this time, it is too early to
determine if there is a threat for severe weather.

.SPOTTER INFORMATION STATEMENT...

Rainfall, hail, wind, or reports of any flooding today would be
appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

DAS

In the hours before

Special weather statement, Jun 28, 1:34 AM CDT, 4 hours 13 minutes before

Special Weather Statement
National Weather Service La Crosse WI
134 AM CDT Fri Jun 28 2019

MNZ079-086-087-094-095-280730-
Wabasha-Olmsted-Dodge-Fillmore-Mower-
134 AM CDT Fri Jun 28 2019

...Thunderstorms with heavy rainfall producing ponding of water
and small hail...

Strong thunderstorms will continue across the area through at least
230 AM this morning. Periods of heavy rainfall will lead to ponding
of water and localized flooding. Small hail is also possible at
times.

Locations impacted include...
Rochester, Mantorville, Kasson, Stewartville, Byron, Chatfield,
Eyota, Oronoco, Elgin, Marion, High Forest, Wasioja, Pleasant Grove,
Douglas, Rock Dell, Viola, Concord, Oslo, Chester and South Troy.

Torrential rainfall is occurring with these storms, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle but be alert for rising water
levels.

LAT...LON 4419 9255 4420 9246 4420 9222 4379 9211
      4380 9273 4420 9285
TIME...MOT...LOC 0629Z 237DEG 9KT 4392 9253

Wetenkamp

Local storm report, Jun 28, 4:43 AM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
443 AM CDT FRI JUN 28 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 AM     HEAVY RAIN       5 WSW CUMMINGSVILLE     43.84N 92.35W
06/28/2019  M4.90 INCH       FILLMORE           MN   TRAINED SPOTTER

&&

LAWRENCE

Local storm report, Jun 28, 5:05 AM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
505 AM CDT FRI JUN 28 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0500 AM     FLASH FLOOD      2 SW WASIOJA            44.06N 92.85W
06/28/2019                   DODGE              MN   EMERGENCY MNGR

            NUMEROUS REPORTS OF ROADS UNDER WATER
            BEGINNING TO COME INTO DISPATCH ACROSS MUCH
            OF NORTHERN DODGE COUNTY.

&&

LAWRENCE

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 10:31 AM CDT	River Flood Warning	ARX	Allamakee	44 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2019 Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.