Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 118, NWS Twin Cities, MN

September 16, 2021Stearns County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 16, 2021, 6:48 PM CDT for Stearns County, Minnesota. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 16, 2021, 6:48 PM CDT (23:48 UTC)
Expired
Sep 16, 2021, 7:30 PM CDT
In force
42 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Stearns County, MN

The radar

The Minneapolis radar (KMPX), 109 km from the middle of the area, began a volume at 23:51 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Sep 16, 6:39 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.8 hours before the alert went out and 106 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2021-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2021-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 362 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1213 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
362 m²/s²
0-3 km storm-relative helicity
428 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted.

931 
WUUS53 KMPX 162348
SVRMPX
MNC145-170030-
/O.NEW.KMPX.SV.W.0118.210916T2348Z-210917T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
648 PM CDT Thu Sep 16 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Central Stearns County in central Minnesota...

* Until 730 PM CDT.

* At 648 PM CDT, a severe thunderstorm was located near Paynesville,
  or 26 miles northeast of Willmar, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Albany and Richmond around 705 PM CDT.

Other locations in the path of this severe thunderstorm include Cold
Spring, Rockville, Avon, St. Joseph, Collegeville, Waite Park and
Sartell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4549 9419 4539 9476 4542 9479 4541 9488
      4542 9491 4551 9492 4572 9432
TIME...MOT...LOC 2348Z 246DEG 36KT 4545 9476 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BPH
3 follow-up statements
703 
WWUS53 KMPX 170005
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
705 PM CDT Thu Sep 16 2021

MNC145-170030-
/O.CON.KMPX.SV.W.0118.000000T0000Z-210917T0030Z/
Stearns MN-
705 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHEASTERN STEARNS COUNTY...

At 705 PM CDT, a severe thunderstorm was located near Richmond, or 17
miles west of St. Cloud, moving northeast at 40 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.

Locations impacted include...
  Cold Spring, Rockville, Avon, St. Joseph, Collegeville, Waite 
  Park, Sartell and St. Cloud.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4549 9419 4546 9465 4556 9470 4572 9432
TIME...MOT...LOC 0005Z 246DEG 36KT 4552 9454 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

NDC
631 
WWUS53 KMPX 170018
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
718 PM CDT Thu Sep 16 2021

MNC145-170030-
/O.CON.KMPX.SV.W.0118.000000T0000Z-210917T0030Z/
Stearns MN-
718 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHEASTERN STEARNS COUNTY...

At 717 PM CDT, a severe thunderstorm was located over Collegeville,
or 8 miles west of St. Cloud, moving northeast at 40 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.

Locations impacted include...
St. Cloud, Waite Park, St. Joseph, Collegeville, Avon and St Wendel. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4552 9421 4552 9445 4560 9455 4572 9432
TIME...MOT...LOC 0017Z 246DEG 36KT 4557 9437 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BPH
186 
WWUS53 KMPX 170022
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
722 PM CDT Thu Sep 16 2021

MNC145-170032-
/O.EXP.KMPX.SV.W.0118.000000T0000Z-210917T0030Z/
Stearns MN-
722 PM CDT Thu Sep 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN STEARNS COUNTY
WILL EXPIRE AT 730 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.  However small hail
is still possible with this thunderstorm.

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

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

LAT...LON 4552 9421 4552 9445 4560 9455 4572 9432
TIME...MOT...LOC 0022Z 246DEG 36KT 4558 9434 

$$

NDC

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 16, 5:45 PM CDTTornado WarningMPXMorrison, Todd33 min
Sep 16, 6:14 PM CDTSpecial Weather StatementMPXMorrison31 min
Sep 16, 6:25 PM CDTSevere Thunderstorm WarningMPXMorrison35 min
Sep 16, 6:26 PM CDTSevere Thunderstorm Warning Considerable damage threatMPXBenton, Morrison, Stearns49 min
Sep 16, 6:30 PM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Swift45 min
Sep 16, 6:32 PM CDTSpecial Weather StatementMPXStearns43 min
Sep 16, 6:32 PM CDTTornado WarningMPXMille Lacs, Morrison43 min
Sep 16, 6:40 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Renville, Yellow Medicine35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.