Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 50, NWS Grand Forks, ND

June 21, 20174 counties in Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 21, 2017, 6:30 PM CDT for 4 counties in Minnesota. It was in force for 60 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 21, 2017, 6:30 PM CDT (23:30 UTC)
Expired: Jun 21, 2017, 7:30 PM CDT
In force: 60 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Beltrami County, MN, Clearwater County, MN, Polk County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 169 km from the middle of the area, began a volume at 23:33 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 21, 6:35 PM CDT	HAIL 1	3 N Trail, MN	NICKEL TO QUARTER SIZED HAIL. REPORT POSTED VIA SOCIAL MEDIA.
Jun 21, 6:40 PM CDT	TSTM WND DMG	6 N Gully, MN	A FEW LARGE 3 TO 5 INCH DIAMETER BRANCHES DOWN ALONG WITH A NUMBER OF DIME TO NICKEL SIZED HAIL.

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 2 storm reports to this severe thunderstorm warning; the first came 5 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
Jun 21, 5:08 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 11.5 hours before the alert went out and 154 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1459 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

363 
WUUS53 KFGF 212330
SVRFGF
MNC007-029-119-125-220030-
/O.NEW.KFGF.SV.W.0050.170621T2330Z-170622T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eastern ND/Grand Forks ND
630 PM CDT WED JUN 21 2017

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southeastern Red Lake County in northwestern Minnesota...
  East central Polk County in northwestern Minnesota...
  Central Beltrami County in north central Minnesota...
  Northern Clearwater County in northwestern Minnesota...

* Until 730 PM CDT.

* At 630 PM CDT, a severe thunderstorm was located over Trail, or 30
  miles southeast of Thief River Falls, moving east at 55 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...
  Gonvick and Berner around 640 PM CDT. 
  Lower Red Lake around 655 PM CDT. 
  Little Rock around 700 PM CDT. 
  Red Lake around 705 PM CDT. 
  Ponemah around 715 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4768 9578 4785 9587 4822 9451 4804 9442
      4795 9442
TIME...MOT...LOC 2330Z 250DEG 49KT 4780 9573 

HAIL...1.25IN
WIND...60MPH
 
$$

dtr

2 follow-up statements

182 
WWUS53 KFGF 212350
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
650 PM CDT WED JUN 21 2017

MNC119-125-220000-
/O.CAN.KFGF.SV.W.0050.000000T0000Z-170622T0030Z/
Red Lake MN-Polk MN-
650 PM CDT WED JUN 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RED LAKE AND EAST
CENTRAL POLK 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 1000 PM CDT for
north central and northwestern Minnesota.

LAT...LON 4773 9555 4792 9556 4822 9451 4804 9442
      4795 9442
TIME...MOT...LOC 2350Z 250DEG 49KT 4789 9534 

$$

MNC007-029-220030-
/O.CON.KFGF.SV.W.0050.000000T0000Z-170622T0030Z/
Beltrami MN-Clearwater MN-
650 PM CDT WED JUN 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR CENTRAL BELTRAMI AND NORTHERN CLEARWATER COUNTIES...

At 650 PM CDT, a severe thunderstorm was located 8 miles northeast of
Berner, or 35 miles northwest of Bemidji, moving east at 55 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 storm will be near...
  Lower Red Lake around 655 PM CDT. 
  Little Rock around 700 PM CDT. 
  Red Lake around 705 PM CDT. 
  Ponemah around 715 PM CDT. 
  Shotley and Saum around 725 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4773 9555 4792 9556 4822 9451 4804 9442
      4795 9442
TIME...MOT...LOC 2350Z 250DEG 49KT 4789 9534 

HAIL...1.25IN
WIND...60MPH
 
$$

dtr

898 
WWUS53 KFGF 220027
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
727 PM CDT WED JUN 21 2017

MNC007-029-220036-
/O.EXP.KFGF.SV.W.0050.000000T0000Z-170622T0030Z/
Beltrami MN-Clearwater MN-
727 PM CDT WED JUN 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BELTRAMI AND NORTHERN
CLEARWATER COUNTIES WILL EXPIRE AT 730 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  The storm will 
move through northeastern Beltrami county north of Saum and south of 
Waskish. 

A severe thunderstorm watch remains in effect until 1000 PM CDT for
north central and northwestern Minnesota.

LAT...LON 4773 9555 4792 9556 4822 9451 4804 9442
      4795 9442
TIME...MOT...LOC 0026Z 250DEG 49KT 4805 9468 

$$

dtr

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 Jun 21, 6:18 PM CDT, 12 minutes earlier.

Area forecast discussion, Jun 21, 6:18 PM CDT, 12 minutes before

Area Forecast Discussion
National Weather Service Grand Forks ND
618 PM CDT Wed Jun 21 2017

.UPDATE...
Issued at 613 PM CDT Wed Jun 21 2017

Storms developed shortly after 430 PM in an area of 1K to 2K J/KG
MUCAPEs and are moving east at around 35 kts. The best shear is
behind the sfc boundary however latest operational EMC/RAP is
showing sufficient sfc-6km shear for development of severe
thunderstorms. Timing these storms out of the CWA in the 02Z to
03Z timeframe and a severe TS watch has been issued valid until
03Z.

&&

.SHORT TERM...(This evening through Thursday)
Issued at 245 PM CDT Wed Jun 21 2017

The chance for strong to severe storms will be the main forecast
challenge for late afternoon into early evening. Currently the
cold front is moving into the Devils Lake region, with fairly
gusty west to northwest winds behind it. Seeing afternoon
temperatures in the upper 70s to lower 80s with dew points that
have crept above 60F. Looking at the SPC meso page, it shows
1000-1500 J/kg of sfc based CAPE, but mainly right along the front
and behind it. Strong push of 850mb winds into the northern Red
River Valley, where the Mayville radar shows a few small cells. So
far not seeing any enhanced cumulus development along the cold
front, so will continue to watch that too. Otherwise, most of the
high resolution models continue to break out storms along the
front, mainly in the 4 to 6 pm time frame. Most of the activity is
forecast to move east of the FA by 10 pm or so, so not looking at
a prolonged event. The high res models also show just a few
stronger cells and not a widespread event. After the storms move
out, west to northwest winds may be a little gusty into the
early evening, but should die down after sunset. Most of Thursday
looks to be quiet for the FA, although there may be a little pcpn
on the northern and southern fringes. Highs look to be a little
cooler than today.

.LONG TERM...(Thursday night through Wednesday)
Issued at 245 PM CDT Wed Jun 21 2017

For Thursday night through early next week, the Northern Plains
remain in northwest flow aloft as a trough digs into the eastern
half of the US. Thus rain chances primarily depend on the
propagation of a series of weak shortwaves moving quickly from
Canada to the Midwest. This pattern will yield some showers and
storms on and off through early next week, but poor operational
model agreement makes it difficult to pinpoint timing and location
of rain chances at this point. That being said, the weekend doesn't
look to be a wash out by any means, and heavy rain or severe storms
are not anticipated due to lack of model agreement on any
significant signal.

The main impact for Friday through Sunday will be cooler weather.
Temperatures for Friday through Sunday will be below normal, with
highs in the 60s to lower 70s. Temperatures look to rebound starting
on Monday as an upper ridge builds in from the Northwest.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 618 PM CDT Wed Jun 21 2017

VFR although a line of strong to severe storms will be into the
TVF area by 00Z and BJI area around 01Z. Storms will move through
quite rapidly as they are moving east at 35 kts. More storms may
develop behind the initial line, clearing the area by 03Z. VFR and
NSW aft 03Z.

&&

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

UPDATE...Speicher
SHORT TERM...Godon
LONG TERM...BP
AVIATION...Speicher

Hazardous weather outlook, Jun 21, 5:54 PM CDT, 36 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
554 PM CDT Wed Jun 21 2017

MNZ001>003-007>009-013>017-022>024-027>032-040-NDZ030-039-049-052-
053-222300-
West Polk-Norman-Clay-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-Traill-Cass-Ransom-
Sargent-Richland-
554 PM CDT Wed Jun 21 2017

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

.DAY ONE...Tonight

Scattered thunderstorms will be possible throughout the evening
hours. Some storms may be strong to severe with the main threats
being hail up to two inches in diameter, up to 70 mph winds, and
dangerous lightning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

MNZ004>006-NDZ006>008-014>016-024-026>029-038-054-222300-
Kittson-Roseau-Lake Of The Woods-Towner-Cavalier-Pembina-Benson-
Ramsey-Eastern Walsh County-Eddy-Nelson-Grand Forks-Griggs-Steele-
Barnes-Western Walsh County-
554 PM CDT Wed Jun 21 2017

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

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be required.

Lee

In the hours before

Special weather statement, Jun 21, 5:31 PM CDT, 59 minutes before

Special Weather Statement
National Weather Service Eastern ND/Grand Forks ND
531 PM CDT WED JUN 21 2017

MNZ003-029-NDZ039-053-212300-
Clay MN-Wilkin MN-Richland ND-Cass ND-
531 PM CDT WED JUN 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN CLAY...NORTHWESTERN
WILKIN...SOUTHEASTERN CASS AND NORTH CENTRAL RICHLAND COUNTIES UNTIL
600 PM CDT...

At 530 PM CDT, Doppler radar was tracking a strong thunderstorm near
Horace, or 13 miles southwest of Fargo, moving east at 55 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Hickson around 535 PM CDT.
  Frontier, Oxbow and Wild Rice around 540 PM CDT.
  Sabin and Dilworth around 545 PM CDT.
  Baker around 550 PM CDT.
  Glyndon and Downer around 555 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A severe thunderstorm watch remains in effect until 1000 PM CDT for
northwestern and west central Minnesota...and southeastern North
Dakota.

LAT...LON 4691 9714 4699 9633 4666 9620 4651 9704
TIME...MOT...LOC 2230Z 251DEG 48KT 4670 9696

dtr

Special weather statement, Jun 21, 5:46 PM CDT, 44 minutes before

Special Weather Statement
National Weather Service Eastern ND/Grand Forks ND
546 PM CDT WED JUN 21 2017

MNZ029-030-NDZ053-212330-
Wilkin MN-West Otter Tail MN-Richland ND-
546 PM CDT WED JUN 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN OTTER TAIL...
NORTHERN WILKIN AND NORTHERN RICHLAND COUNTIES UNTIL 630 PM CDT...

At 545 PM CDT, Doppler radar was tracking a strong thunderstorm near
Christine, or 21 miles northwest of Wahpeton, moving east at 55 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.  Spotters are also watching a wall cloud structure with
this storm.

This strong thunderstorm will be near...
  Wolverton and Abercrombie around 550 PM CDT.
  Kent and McCauleyville around 555 PM CDT.
  Lawndale around 610 PM CDT.
  Rothsay around 615 PM CDT.
  Erhard, Pelican Rapids and Elizabeth around 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A severe thunderstorm watch remains in effect until 1000 PM CDT for
northwestern and west central Minnesota...and southeastern North
Dakota.

LAT...LON 4635 9716 4663 9717 4662 9587 4634 9590
TIME...MOT...LOC 2245Z 273DEG 46KT 4653 9685

dtr

Local storm report, Jun 21, 5:59 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
559 PM CDT WED JUN 21 2017

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

0558 PM     TSTM WND GST     2 NE SABIN              46.80N 96.62W
06/21/2017  M48 MPH          CLAY               MN   MESONET

            NDAWN STATION 2 NE SABIN.

&&

ALEE

Special weather statement, Jun 21, 6:06 PM CDT, 24 minutes before

Special Weather Statement
National Weather Service Eastern ND/Grand Forks ND
606 PM CDT WED JUN 21 2017

MNZ014-015-212330-
Red Lake MN-East Polk MN-
606 PM CDT WED JUN 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN RED LAKE AND
SOUTHEASTERN POLK COUNTIES UNTIL 630 PM CDT...

At 605 PM CDT, Doppler radar was tracking a strong thunderstorm over
Dugdale, or 30 miles south of Thief River Falls, moving east at 55
mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Mentor around 610 PM CDT.
  Erskine around 615 PM CDT.
  Brooks around 620 PM CDT.
  McIntosh around 625 PM CDT.
  Oklee, Trail and Gully around 630 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A severe thunderstorm watch remains in effect until 1000 PM CDT for
northwestern Minnesota.

LAT...LON 4750 9630 4766 9635 4777 9635 4793 9559
      4750 9558
TIME...MOT...LOC 2305Z 253DEG 49KT 4767 9625

dtr

Local storm report, Jun 21, 6:19 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
619 PM CDT WED JUN 21 2017

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

0614 PM     TSTM WND GST     6 N WAHPETON            46.36N 96.61W
06/21/2017  M44 MPH          WILKIN             MN   MESONET

            NDAWN STATION 6 N WAHPETON.

&&

ALEE

Local storm report, Jun 21, 6:21 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
621 PM CDT WED JUN 21 2017

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

0620 PM     FUNNEL CLOUD     1 SW BRUSHVALE          46.36N 96.66W
06/21/2017                   RICHLAND           ND   STORM CHASER

            WELL DEVELOPED WALL CLOUD WITH FUNNEL DEVELOPING.

&&

GGUST

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 5:31 PM CDT	Special Weather Statement	FGF	Clay	29 min
Jun 21, 5:46 PM CDT	Special Weather Statement	FGF	Wilkin	44 min
Jun 21, 6:02 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay	43 min
Jun 21, 6:06 PM CDT	Special Weather Statement	FGF	Red Lake	24 min
Jun 21, 6:21 PM CDT	Tornado Warning	FGF	Otter Tail, Wilkin	24 min
Jun 21, 6:41 PM CDT	Tornado Warning	FGF	Otter Tail, Wilkin	49 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 Every severe thunderstorm warning in 2017

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.