Alert archive / Minnesota / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 96, NWS Twin Cities, MN

July 15, 2024Stevens County, Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 15, 2024, 6:30 AM CDT for Stevens County, Swift County, Minnesota. It was in force for 30 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: Jul 15, 2024, 6:30 AM CDT (11:30 UTC)
Expired: Jul 15, 2024, 7:00 AM CDT
In force: 30 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Stevens County, MN, Swift County, MN

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 25 minutes after it went out.

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

Minneapolis, MN (KMPX), launched 00:00Z, 11.5 hours before the alert went out and 175 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: 1631 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

932 
WUUS53 KMPX 151130
SVRMPX
MNC149-151-151200-
/O.NEW.KMPX.SV.W.0096.240715T1130Z-240715T1200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
630 AM CDT Mon Jul 15 2024

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Stevens County in west central Minnesota...
  Swift County in west central Minnesota...

* Until 700 AM CDT.

* At 630 AM CDT, a severe thunderstorm was located 8 miles south of
  Hancock, or 15 miles south of Morris, moving southeast at 45 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...
  Benson, Lake Hassel, Clontarf, De Graff, Danvers, and Benson
  Airport.

This includes the following highways...
 U.S. Highway 12 between mile markers 31 and 50.
 U.S. Highway 59 between mile markers 148 and 153.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4547 9583 4545 9575 4541 9574 4542 9564
      4534 9537 4515 9560 4515 9568 4538 9597
TIME...MOT...LOC 1130Z 297DEG 40KT 4538 9581 

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

$$

CTG

1 follow-up statement

562 
WWUS53 KMPX 151142
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
642 AM CDT Mon Jul 15 2024

MNC149-151152-
/O.CAN.KMPX.SV.W.0096.000000T0000Z-240715T1200Z/
Stevens MN-
642 AM CDT Mon Jul 15 2024

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STEVENS COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

&&

LAT...LON 4536 9566 4530 9541 4515 9560 4515 9568
      4527 9581
TIME...MOT...LOC 1142Z 297DEG 40KT 4532 9563 

$$

MNC151-151200-
/O.CON.KMPX.SV.W.0096.000000T0000Z-240715T1200Z/
Swift MN-
642 AM CDT Mon Jul 15 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 AM CDT
FOR CENTRAL SWIFT COUNTY...

At 642 AM CDT, a severe thunderstorm was located over Benson, or 23
miles southeast of Morris, moving southeast at 45 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...
Benson, De Graff, Danvers, and Benson Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4536 9566 4530 9541 4515 9560 4515 9568
      4527 9581
TIME...MOT...LOC 1142Z 297DEG 40KT 4532 9563 

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

$$

CTG

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 Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 15, 6:23 AM CDT, 7 minutes earlier. Its key messages:

Severe weather possible this morning and Monday afternoon. Damaging wind is the primary threat, followed by hail. The risk for tornadoes is low.
Cooler and drier weather remains on track for the rest of the week.

Area forecast discussion, Jul 15, 6:23 AM CDT, 7 minutes before

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
623 AM CDT Mon Jul 15 2024

.KEY MESSAGES...

- Severe weather possible this morning and Monday afternoon.
  Damaging wind is the primary threat, followed by hail. The
  risk for tornadoes is low.

- Cooler and drier weather remains on track for the rest of the week.

&&

.DISCUSSION...
Issued at 244 AM CDT Mon Jul 15 2024

Current mosaic radar imagery shows a cluster of thunderstorms
currently over eastern ND. This activity is traveling southeast with
an additional band of thunderstorms developing along a zone of
frontogenesis downstream. Using the HRRR, as it seems to have the
best handle on the current precip, this activity will reach western
MN around 4 AM and travel through southern MN by mid-morning. The
frontogenesis band of storms shouldn't be overly strong, but one or
two supercells from the original cluster will follow in their wake.
The most likely track of the supercells looks to be a line from MOX
to BDH to MKT and the primary hazards associated with these storms
will be large hail and damaging winds. To the east, garden variety
thunderstorms and showers should spread across eastern MN and into
western WI. Thus, expect at least a wet morning for most of the
region before a dry period follows by early this afternoon. Once the
rain exits, temperatures should climb into the low to mid 80s.
However, another round of showers and thunderstorms is possible
later this afternoon, mainly in southeastern MN and west-central WI,
as a cold front sags south. CAMs and the Storm Prediction Center
aren't too optimistic about severe weather with this round, but a
stray damaging wind gust or large hailstone can't be ruled out. This
precip will exit to our southeast by this evening.

Following the cold front, a much milder air mass and strong surface
high pressure will settle over the Upper Midwest. This will set us
up for a very comfortable and dry stretch of weather Monday night
through at least Friday. Highs Tuesday through Thursday will
generally be in the 70s, as 80s don't look to make a return until
next weekend. A few upper 40s could even occur in our rural areas
Wednesday night, highlighting the coolness of this mid-summer air
mass. Precipitation chances will remain very low until next weekend
when long-range forecast models start to show weak impulses within
the north-northwesterly upper-level flow passing through our region.
However, the subtleness of these features combined with their spread
of timing and placement between models provides low forecast
confidence of precip next weekend at this time. We are likely
heading into our first prolonged stretch of dry weather after today.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 617 AM CDT Mon Jul 15 2024

Ongoing convection across western Minnesota will impact
KRWF/KMKT/KSTC but less optimistic about strong convection
farther away from the best lift and instability. We will
maintain -SHRA for eastern TAF sites. For EAU, some IFR fog
will be addressed with a TEMPO. Low-end VFR cigs will likely
develop this afternoon as a cold frontal passage occurs with
another round of thunderstorms possible in southeast MN and
western WI. Confidence remains somewhat low so I allowed the
PROB30 to drop off for -TSRA at MKT, MSP, RNH, and EAU for this
afternoon's potential. Skies should clear this evening.
Southeasterly winds will turn more westerly as Monday
progresses, exceeding 10 knots by the afternoon. Northwesterly
winds will prevail this evening behind the cold front.

KMSP...Opted to just have -SHRA from 12-16Z as greater
confidence in morning thunderstorms is farther west. Did not
carry over the -TSRA PROB30 due to low confidence of additional
convection this afternoon.

/OUTLOOK FOR KMSP/
TUE...VFR, Wind NW 5-15 kts.
WED...VFR, Wind N 5-10 kts.
THU...VFR, Wind VRB 0-5 kts.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...None.
WI...None.

&&

DISCUSSION...CTG
AVIATION...BPH

Hazardous weather outlook, Jul 15, 3:11 AM CDT, 3 hours 19 minutes before

Hazardous Weather Outlook
National Weather Service Twin Cities/Chanhassen MN
311 AM CDT Mon Jul 15 2024

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
160815-
Douglas-Todd-Morrison-Mille Lacs-Kanabec-Stevens-Pope-Stearns-
Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-Chippewa-
Kandiyohi-Meeker-Wright-Hennepin-Anoka-Ramsey-Washington-
Yellow Medicine-Renville-McLeod-Sibley-Carver-Scott-Dakota-
Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-Blue Earth-
Waseca-Steele-Martin-Faribault-Freeborn-Polk-Barron-Rusk-
St. Croix-Pierce-Dunn-Pepin-Eau Claire-
311 AM CDT Mon Jul 15 2024

This Hazardous Weather Outlook is for portions of central and
southern Minnesota, and west central Wisconsin.

.DAY ONE...Today and Tonight.

Strong to severe thunderstorms possible this morning across
western and central Minnesota. Damaging winds and large hail will
the be primary threats.

This afternoon an additional, but lower, chance for strong to
severe thunderstorms to develop again across eastern Minnesota
into western Wisconsin, Damaging wind gusts are the primary
threat, followed by large hail.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotter activation may be needed.

In the hours before

Local storm report, Jul 15, 4:41 AM CDT, 1 hour 49 minutes before

Preliminary Local Storm Report
National Weather Service Twin Cities/Chanhassen MN
441 AM CDT Mon Jul 15 2024

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

0430 AM     Hail             1 W Granite Falls       44.81N 95.55W
07/15/2024  E1.25 Inch       Yellow Medicine    MN   Public

            Report from mPING: Half Dollar (1.25 in.).

&&

Local storm report, Jul 15, 5:16 AM CDT, 1 hour 14 minutes before

Preliminary Local Storm Report
National Weather Service Twin Cities/Chanhassen MN
516 AM CDT Mon Jul 15 2024

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

0508 AM     Hail             Redwood Falls           44.54N 95.12W
07/15/2024  E1.25 Inch       Redwood            MN   Public

            Report from mPING: Half Dollar (1.25 in.).

&&

BPH

Local storm report, Jul 15, 5:29 AM CDT, 1 hour 1 minute before

Preliminary Local Storm Report
National Weather Service Twin Cities/Chanhassen MN
529 AM CDT Mon Jul 15 2024

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

0529 AM     Hail             Morgan                  44.42N 94.93W
07/15/2024  M1.25 Inch       Redwood            MN   Trained Spotter

&&

BPH

Special weather statement, Jul 15, 6:05 AM CDT, 25 minutes before

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
605 AM CDT Mon Jul 15 2024

MNZ074-082-083-151145-
Brown MN-Blue Earth MN-Watonwan MN-
605 AM CDT Mon Jul 15 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN BROWN...
SOUTHWESTERN BLUE EARTH AND NORTHEASTERN WATONWAN COUNTIES THROUGH
645 AM CDT...

At 605 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hanska, or 8 miles south of New Ulm, moving southeast at 40 mph.

HAZARD...Wind gusts up to 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Lake Crystal, Madelia, Good Thunder, Hanska, Vernon Center, Garden
City, and Searles.

This includes U.S. Highway 169 between mile markers 29 and 46.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4420 9460 4427 9449 4406 9396 4385 9422
      4385 9424
TIME...MOT...LOC 1105Z 308DEG 34KT 4419 9450

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

CTG

Local storm report, Jul 15, 6:09 AM CDT, 21 minutes before

Preliminary Local Storm Report
National Weather Service Twin Cities/Chanhassen MN
609 AM CDT Mon Jul 15 2024

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

0549 AM     Hail             Sleepy Eye              44.30N 94.72W
07/15/2024  M1.00 Inch       Brown              MN   Public

            Report from mPING: Quarter (1.00 in.).

&&

mpg

Special weather statement, Jul 15, 6:17 AM CDT, 13 minutes before

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
617 AM CDT Mon Jul 15 2024

MNZ047-048-055-056-151200-
Chippewa MN-Stevens MN-Pope MN-Swift MN-
617 AM CDT Mon Jul 15 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN POPE...NORTH CENTRAL
CHIPPEWA...SOUTHEASTERN STEVENS AND SWIFT COUNTIES THROUGH 700 AM
CDT...

At 617 AM CDT, Doppler radar was tracking a cluster of strong
thunderstorms 6 miles north of Lake Oliver, or 11 miles south of
Morris, moving southeast at 45 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Benson, Hancock, Lake Hassel, Lake Oliver, Clontarf, Hagen, De Graff,
Danvers, Holloway, Benson Airport, Swift Falls, and Big Bend City.

This includes the following highways...
 U.S. Highway 12 between mile markers 24 and 51.
 U.S. Highway 59 between mile markers 141 and 162.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4545 9616 4556 9595 4538 9530 4502 9572
TIME...MOT...LOC 1117Z 307DEG 37KT 4543 9599

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

CTG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 3:18 AM CDT	Special Weather Statement	MPX	Lac qui Parle	42 min
Jul 15, 3:28 AM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	32 min
Jul 15, 3:56 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Yellow Medicine	34 min
Jul 15, 4:18 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Redwood, Renville, Yellow Medicine	42 min
Jul 15, 4:40 AM CDT	Special Weather Statement	MPX	Lac qui Parle	50 min
Jul 15, 4:53 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood, Renville	37 min
Jul 15, 5:27 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	33 min
Jul 15, 5:44 AM CDT	Severe Thunderstorm Warning	MPX	Stevens	46 min
Jul 15, 6:05 AM CDT	Special Weather Statement	MPX	Blue Earth	40 min
Jul 15, 6:17 AM CDT	Special Weather Statement	MPX	Swift	43 min
Jul 15, 6:53 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Swift	37 min
Jul 15, 7:14 AM CDT	Tornado Warning	MPX	Chippewa, Kandiyohi, Renville	31 min
Jul 15, 7:32 AM CDT	Special Weather Statement	MPX	Watonwan	43 min
Jul 15, 7:39 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Kandiyohi, Renville	51 min
Jul 15, 8:05 AM CDT	Special Weather Statement	MPX	Faribault	40 min
Jul 15, 10:07 AM CDT	River Flood Warning	MPX	Redwood, Renville	3 days

Nearby

Severe Thunderstorm Warnings in Minnesota, 2024 Every severe thunderstorm warning in 2024

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.