Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 58, NWS La Crosse, WI

July 27, 2021Fillmore County, Olmsted County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 27, 2021, 9:48 PM CDT for Fillmore County, Olmsted County, Minnesota. It was in force for 42 min. 1 report 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: Jul 27, 2021, 9:48 PM CDT (02:48 UTC)
Expired: Jul 27, 2021, 10:30 PM CDT
In force: 42 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Fillmore County, MN, Olmsted County, MN

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 02:49 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
Jul 27, 10:05 PM CDT	TSTM WND GST 60	2 Wsw Fillmore, MN	WIND GUST FROM A HOME WEATHER STATION NORTHWEST OF WYKOFF.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 27, 8:03 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.8 hours before the alert went out and 161 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: 4029 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

As transmitted.

375 
WUUS53 KARX 280248
SVRARX
MNC045-109-280330-
/O.NEW.KARX.SV.W.0058.210728T0248Z-210728T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
948 PM CDT Tue Jul 27 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  South central Olmsted County in southeastern Minnesota...
  Northwestern Fillmore County in southeastern Minnesota...

* Until 1030 PM CDT.

* At 948 PM CDT, a severe thunderstorm was located near Chatfield, or
  15 miles southeast of Rochester, moving southeast at 15 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Chatfield around 955 PM CDT.
  Wykoff around 1025 PM CDT.
  Preston and Fountain around 1030 PM CDT.

Other locations impacted by this severe thunderstorm include County
Roads 2 And 38, Forestville State Park, Carimona, Fillmore, County
Roads 2 And 101, Cummingsville and Washington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4388 9235 4389 9218 4362 9199 4361 9237
TIME...MOT...LOC 0248Z 335DEG 13KT 4386 9226 

HAIL...1.00IN
WIND...<50MPH
 
$$

Peters

2 follow-up statements

507 
WWUS53 KARX 280312
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
1012 PM CDT Tue Jul 27 2021

MNC109-280321-
/O.CAN.KARX.SV.W.0058.000000T0000Z-210728T0330Z/
Olmsted MN-
1012 PM CDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL OLMSTED COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
southeastern Minnesota.

LAT...LON 4385 9235 4385 9215 4362 9199 4361 9237
TIME...MOT...LOC 0311Z 347DEG 17KT 4371 9225 

$$

MNC045-280330-
/O.CON.KARX.SV.W.0058.000000T0000Z-210728T0330Z/
Fillmore MN-
1012 PM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR NORTHWESTERN FILLMORE COUNTY...

At 1011 PM CDT, a severe thunderstorm was located over Wykoff, or 8
miles west of Preston, moving south at 20 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Preston around 1020 PM CDT.

Other locations impacted by this severe thunderstorm include County
Roads 2 And 38, Fillmore, Forestville State Park, Carimona, County
Roads 2 And 101 and Washington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4385 9235 4385 9215 4362 9199 4361 9237
TIME...MOT...LOC 0311Z 347DEG 17KT 4371 9225 

HAIL...1.00IN
WIND...<50MPH
 
$$

Peters

332 
WWUS53 KARX 280325
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
1025 PM CDT Tue Jul 27 2021

MNC045-280334-
/O.EXP.KARX.SV.W.0058.000000T0000Z-210728T0330Z/
Fillmore MN-
1025 PM CDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FILLMORE COUNTY
WILL EXPIRE AT 1030 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
southeastern Minnesota.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
La Crosse.

LAT...LON 4385 9235 4385 9215 4362 9199 4361 9237
TIME...MOT...LOC 0324Z 335DEG 13KT 4368 9223 

$$

Peters

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 8:30 PM CDT	Severe Thunderstorm Warning	ARX	Olmsted, Wabasha, Winona	45 min
Jul 27, 9:16 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore, Olmsted, Winona	44 min
Jul 27, 10:24 PM CDT	Special Weather Statement	ARX	Fillmore	81 min
Jul 28, 8:43 AM CDT	Special Weather Statement	ARX	Dodge, Mower	47 min
Jul 28, 9:17 AM CDT	Special Weather Statement	ARX	Mower, Olmsted, Wabasha	28 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Every severe thunderstorm warning in 2021

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.