Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 142, NWS Grand Forks, ND

July 8, 2020Grant County, Otter Tail County, Wilkin County, Minnesota; Richland County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 8, 2020, 5:00 AM CDT for Grant County, Otter Tail County, Wilkin County, Minnesota; Richland County, North Dakota. It was in force for 60 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 8, 2020, 5:00 AM CDT (10:00 UTC)
Expired: Jul 8, 2020, 6:00 AM CDT
In force: 60 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grant County, MN, Otter Tail County, MN, Wilkin County, MN, Richland County, ND

The radar

The Aberdeen radar (KABR), 182 km from the middle of the area, began a volume at 10:01 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 8, 5:15 AM CDT	TSTM WND DMG	3 Ssw Ashby, MN	A FEW LARGE TREE BRANCHES BROKEN DOWN.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 15 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 7, 11:44 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 10.0 hours before the alert went out and 210 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: 567 J/kg
Mixed-layer CIN: -367 J/kg
Mixed-layer LCL: 1705 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

728 
WUUS53 KFGF 081000
SVRFGF
MNC051-111-167-NDC077-081100-
/O.NEW.KFGF.SV.W.0142.200708T1000Z-200708T1100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
500 AM CDT Wed Jul 8 2020

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Otter Tail County in west central Minnesota...
  Grant County in west central Minnesota...
  Southeastern Wilkin County in west central Minnesota...
  Southeastern Richland County in southeastern North Dakota...

* Until 600 AM CDT.

* At 500 AM CDT, a severe thunderstorm was located over White Rock,
  or 25 miles south of Wahpeton, moving east at 25 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Norcross around 540 AM CDT.
  Herman around 545 AM CDT.
  Barrett and Elbow Lake around 600 AM CDT.

This includes Interstate 94 in Minnesota between mile markers 63 and
80.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4602 9627 4602 9657 4593 9656 4594 9679
      4615 9666 4622 9570 4611 9571 4611 9577
      4576 9576 4576 9625
TIME...MOT...LOC 1000Z 268DEG 24KT 4590 9656 

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

Knutsvig

1 follow-up statement

344 
WWUS53 KFGF 081045
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
545 AM CDT Wed Jul 8 2020

MNC111-167-NDC077-081055-
/O.CAN.KFGF.SV.W.0142.000000T0000Z-200708T1100Z/
Otter Tail MN-Wilkin MN-Richland ND-
545 AM CDT Wed Jul 8 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN OTTER TAIL...
SOUTHEASTERN WILKIN AND SOUTHEASTERN RICHLAND COUNTIES 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 600 AM CDT for
west central Minnesota.

LAT...LON 4576 9625 4593 9625 4594 9626 4602 9626
      4611 9577 4576 9576
TIME...MOT...LOC 1045Z 286DEG 36KT 4584 9589 

$$

MNC051-081100-
/O.CON.KFGF.SV.W.0142.000000T0000Z-200708T1100Z/
Grant MN-
545 AM CDT Wed Jul 8 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 AM CDT
FOR GRANT COUNTY...

At 545 AM CDT, a severe thunderstorm was located near Barrett, or 31
miles south of Fergus Falls, moving east at 40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Elbow Lake, Hoffman, Ashby, Herman, Barrett, Wendell and Norcross. 

This includes Interstate 94 in Minnesota between mile markers 73 and
80.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4576 9625 4593 9625 4594 9626 4602 9626
      4611 9577 4576 9576
TIME...MOT...LOC 1045Z 286DEG 36KT 4584 9589 

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

Lynch

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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 8, 4:00 AM CDT, 1 hour earlier.

Area forecast discussion, Jul 8, 4:00 AM CDT, 1 hour before

Area Forecast Discussion
National Weather Service Grand Forks ND
400 AM CDT Wed Jul 8 2020

.SHORT TERM...(Today through Thursday)
Issued at 353 AM CDT Wed Jul 8 2020

500 mb short wave moving NE thru E ND and southern Manitoba.
Thunderstorms over northern ND decreased in intensity as they
moved east as the 850 mb low level jet developed stronger storms
over SE ND. Bow echo that moved just north of I-94 also weakened
as it moved into east central ND by 08z as main t-storms held in
a bit south. What is left for this morning is an area of rain and
embedded t-storms in NW MN and stronger t-storms in far SE ND and
parts of WC MN. The atmosphere farther east into MN ahead of the
SE ND storms isnt too supportive for severe but at least this area
still has a chance for isold svr thru 11z. Did drop the watch for
NE ND and NW MN and kept it for SE ND and WC MN.

Rainfall so far heaviest in parts of the southern RRV in the
Fargo-Valley City area and parts of Richland county with pockets
of 1.50+ inches.

This activity will exit this morning. The 500 mb low center is
over west central Saskatchewan and this will move east. Drier air
will move into E ND today and a cold front will move east and be
in the RRV midday and in western MN by mid aftn. Some storms will
fire along the front, though warm 700 mb temps in the 13-14C range
in the aftn may limit any storm potential in west central MN with
best chances it seems from various CAMs Bemidji and east into the
MN arrowhead.

As the 500 mb low moves east thru central Manitoba some wraparound
moisture and a low risk of a shower or t-storms will spread along
the ND/Manitoba border Thursday morning with the rest of the area
dry. Bit breezy though with west winds 15 to 30 mph.

.LONG TERM...(Thursday night through Tuesday)
Issued at 353 AM CDT Wed Jul 8 2020

The main impacts through the long term will be the continued heat
and humidity...and periodic chances for thunderstorms.

Will initially start the period with some sort of near zonal 500mb
flow. Therefore most of the area should remain dry in the Thursday
night into Friday time frame. Then a western United States ridge
starts to build, putting this FA into northwest flow. Models show a
short wave shifting into the FA Friday night to Saturday. This
should bring a chance for precipitation to most of the area.

The western ridge slowly shifts east into this FA by Sunday into
early Monday. For this reason, highs on Sunday and Monday should
be the warmest of the long term period, or in the mid to upper 80s.
Low pressure moving into the Canadian Rockies on Monday into Tuesday
should push the 500mb ridge east of the FA, putting the FA back into
either southwest or zonal flow again. Once again, there is a
potential short wave somewhere by Monday afternoon into early
Tuesday, that could bring another round of precipitation to the
area. Other than the potentially warmer days Sunday and Monday,
highs look to be only slightly above normal (more low to mid 80s).

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1138 PM CDT Tue Jul 7 2020

Pretty much kept with the timing from the 00z set of TAFs. Main
impacts will be gusty winds with overnight storms. Best chance for
any redevelopment Wednesday afternoon will be at KBJI.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.

SHORT TERM...Riddle
LONG TERM...Godon
AVIATION...Godon

Hazardous weather outlook, Jul 7, 3:38 PM CDT, 13 hours 22 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
338 PM CDT Tue Jul 7 2020

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-082045-
West Polk-Norman-Clay-Kittson-Roseau-Lake Of The Woods-
West Marshall-East Marshall-North Beltrami-Pennington-Red Lake-
East Polk-North Clearwater-South Beltrami-Mahnomen-
South Clearwater-Hubbard-West Becker-East Becker-Wilkin-
West Otter Tail-East Otter Tail-Wadena-Grant-Towner-Cavalier-
Pembina-Benson-Ramsey-Eastern Walsh-Eddy-Nelson-Grand Forks-
Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland-
Western Walsh-
338 PM CDT Tue Jul 7 2020

This hazardous weather outlook is for portions of eastern North
Dakota, west central and northwest Minnesota.

.DAY ONE...This Afternoon and Tonight

Thunderstorms will develop or move into the area this evening and
continue through the overnight hours. All hazards are expected, with
risks for hail to 2 inches, wind gusts of 75 mph or greater,
localized flash flooding and possibly a tornado. Main risk area is
all of eastern North Dakota, the Red River valley and
northwestern Minnesota.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

A chance for severe thunderstorms exists Wednesday east of a
Baudette to Detroit Lakes to Wahpeton line. Threats are large hail
and damaging winds.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

In the hours before

Local storm report, Jul 8, 4:30 AM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
430 AM CDT WED JUL 8 2020

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

0419 AM     TSTM WND GST     6 SW FOXHOME            46.22N 96.40W
07/08/2020  M60 MPH          Wilkin             MN   MESONET

            PEAK WINDS MEASURED AT A PERSONAL WEATHER STATION LOCATED
            10 ESE BRECKENRIDGE.

&&

GGUST

Local storm report, Jul 8, 4:32 AM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
432 AM CDT WED JUL 8 2020

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

0420 AM     TSTM WND GST     2 W TENNEY              46.04N 96.50W
07/08/2020  M74 MPH          Wilkin             MN   MESONET

            PEAK WIND MEASURED AT AN RWIS STATION.

&&

GGUST

Local storm report, Jul 8, 4:35 AM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
435 AM CDT WED JUL 8 2020

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

0420 AM     TSTM WND GST     2 NNW ROTHSAY           46.50N 96.30W
07/08/2020  M71 MPH          Wilkin             MN   MESONET

            PEAK WIND MEASURED AT AN RWIS STATION.

&&

GGUST

Local storm report, Jul 8, 4:38 AM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
438 AM CDT WED JUL 8 2020

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

0435 AM     TSTM WND GST     2 W FERGUS FALLS        46.28N 96.11W
07/08/2020  M83 MPH          Otter Tail         MN   ASOS

            PEAK WIND MEASURED AT THE FERGUS FALLS AIRPORT /KFFM/.

&&

GGUST

Local storm report, Jul 8, 4:39 AM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
439 AM CDT WED JUL 8 2020

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

0437 AM     FUNNEL CLOUD     2 E FERGUS FALLS        46.28N 96.03W
07/08/2020                   Otter Tail         MN   911 CALL CENTER

            FUNNEL CLOUD OBSERVED EAST OF TOWN MOVING TOWARDS
            UNDERWOOD.

&&

GGUST

Local storm report, Jul 8, 4:51 AM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
451 AM CDT WED JUL 8 2020

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

0433 AM     TSTM WND GST     FERGUS FALLS            46.28N 96.07W
07/08/2020  M62 MPH          OTTER TAIL         MN   MESONET

            PEAK WIND MEASURED AT A PERSONAL WEATHER STATION.

&&

GGUST

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 8, 1:42 AM CDT	Special Weather Statement	FGF	Wilkin	63 min
Jul 8, 2:12 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Wilkin	63 min
Jul 8, 2:18 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman, Polk	57 min
Jul 8, 2:22 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Polk	53 min
Jul 8, 3:10 AM CDT	Special Weather Statement	FGF	Clay	50 min
Jul 8, 3:17 AM CDT	Special Weather Statement	FGF	Clay	58 min
Jul 8, 3:22 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Wilkin	38 min
Jul 8, 3:36 AM CDT	Areal Flood Advisory	FGF	Clay	8 hr
Jul 8, 3:58 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	62 min
Jul 8, 4:14 AM CDT	Tornado Warning	FGF	Otter Tail, Wilkin	31 min
Jul 8, 4:43 AM CDT	Tornado Warning	FGF	Grant, Otter Tail	47 min
Jul 8, 5:20 AM CDT	Tornado Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	40 min
Jul 8, 5:53 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	27 min
Jul 8, 6:19 AM CDT	Special Weather Statement	FGF	Wadena	56 min
Jul 8, 10:42 AM CDT	River Flood Warning	FGF	Clay	4 days
Jul 8, 5:00 PM CDT	Special Weather Statement	FGF	Otter Tail	45 min
Jul 8, 5:08 PM CDT	Tornado Warning	FGF	Grant, Otter Tail	52 min
Jul 8, 5:30 PM CDT	Special Weather Statement	FGF	Otter Tail	60 min
Jul 8, 6:05 PM CDT	Special Weather Statement	FGF	Otter Tail	25 min
Jul 8, 6:33 PM CDT	Special Weather Statement	FGF	Otter Tail	27 min
Jul 8, 6:35 PM CDT	Tornado Warning Tornado observed	FGF	Otter Tail, Wadena	25 min
Jul 8, 12:19 AM CDT	Special Weather Statement	FGF	Barnes, Cass, Ransom, Sargent	56 min
Jul 8, 12:29 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs	61 min
Jul 8, 12:44 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey, Towner	46 min
Jul 8, 1:08 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland	52 min
Jul 8, 1:15 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland	60 min
Jul 8, 1:29 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Grand Forks, Griggs, Nelson, Steele	61 min
Jul 8, 1:32 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele, Traill	58 min
Jul 8, 1:33 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Nelson, Ramsey, Towner, Walsh	57 min
Jul 8, 1:46 AM CDT	Tornado Warning	FGF	Griggs, Steele	33 min
Jul 8, 1:51 AM CDT	Special Weather Statement	FGF	Barnes	54 min
Jul 8, 2:20 AM CDT	Special Weather Statement	FGF	Cavalier, Pembina	40 min
Jul 8, 4:23 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	52 min
Jul 8, 6:19 AM CDT	Areal Flood Advisory	FGF	Richland, Sargent	8 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Severe Thunderstorm Warnings in North Dakota, 2020 Every severe thunderstorm warning in 2020

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.