Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 111, NWS Grand Forks, ND

July 21, 2017Otter Tail County, Wilkin County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 21, 2017, 6:57 PM CDT for Otter Tail County, Wilkin County, Minnesota. It was in force for 63 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 21, 2017, 6:57 PM CDT (23:57 UTC)
Expired: Jul 21, 2017, 8:00 PM CDT
In force: 63 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Otter Tail County, MN, Wilkin County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 143 km from the middle of the area, began a volume at 23:54 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 21, 7:10 PM CDT	HAIL 1.25	3 Se Rothsay, MN	SOME QUARTER TO HALF DOLLAR SIZED HAIL IN HEAVY RAIN.

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 13 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 21, 3:07 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 12.0 hours before the alert went out and 248 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: 4 J/kg
Mixed-layer CIN: -638 J/kg
Mixed-layer LCL: 2490 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

938 
WUUS53 KFGF 212357
SVRFGF
MNC111-167-220100-
/O.NEW.KFGF.SV.W.0111.170721T2357Z-170722T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eastern ND/Grand Forks ND
657 PM CDT FRI JUL 21 2017

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Western Otter Tail County in west central Minnesota...
  Northeastern Wilkin County in west central Minnesota...

* Until 800 PM CDT.

* At 656 PM CDT, a severe thunderstorm was located near Rothsay, or
  17 miles northwest of Fergus Falls, moving southeast at 30 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. 

* This severe thunderstorm will be near...
  Erhard around 710 PM CDT. 
  Carlisle around 715 PM CDT. 
  Elizabeth and Edwards around 720 PM CDT. 
  Fergus Falls around 730 PM CDT. 
  Underwood around 745 PM CDT. 

Other locations impacted by this severe thunderstorm include Fergus
Falls Airport.

This includes Interstate 94 in Minnesota between mile markers 31 and
64.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4651 9654 4663 9619 4663 9618 4664 9617
      4667 9608 4632 9564 4612 9614
TIME...MOT...LOC 2356Z 321DEG 24KT 4651 9624 

HAIL...1.00IN
WIND...60MPH
 
$$

JH

3 follow-up statements

708 
WWUS53 KFGF 220016
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
716 PM CDT FRI JUL 21 2017

MNC111-167-220100-
/O.CON.KFGF.SV.W.0111.000000T0000Z-170722T0100Z/
Otter Tail MN-Wilkin MN-
716 PM CDT FRI JUL 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR WESTERN OTTER TAIL AND EAST CENTRAL WILKIN COUNTIES...

At 715 PM CDT, a severe thunderstorm was located near Carlisle, or 11
miles northwest of Fergus Falls, moving southeast at 25 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. 

This severe storm will be near...
  Elizabeth and Carlisle around 725 PM CDT. 
  Fergus Falls around 740 PM CDT. 
  Underwood around 755 PM CDT. 

Other locations impacted by this severe thunderstorm include Fergus
Falls Airport.

This includes Interstate 94 in Minnesota between mile markers 38 and
64.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4644 9647 4646 9634 4653 9623 4657 9612
      4661 9600 4632 9564 4612 9614
TIME...MOT...LOC 0015Z 326DEG 21KT 4642 9619 

HAIL...1.00IN
WIND...60MPH
 
$$

JH

882 
WWUS53 KFGF 220041
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
741 PM CDT FRI JUL 21 2017

MNC111-167-220100-
/O.CON.KFGF.SV.W.0111.000000T0000Z-170722T0100Z/
Otter Tail MN-Wilkin MN-
741 PM CDT FRI JUL 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR SOUTHWESTERN OTTER TAIL AND EAST CENTRAL WILKIN COUNTIES...

At 741 PM CDT, a severe thunderstorm was located near Fergus Falls,
moving southeast at 20 mph.

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

SOURCE...Radar indicated. 

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

This severe storm will be near...
  Fergus Falls around 750 PM CDT. 

Other locations impacted by this severe thunderstorm include Fergus
Falls Airport.

This includes Interstate 94 in Minnesota between mile markers 46 and
64.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4638 9641 4640 9628 4640 9616 4644 9604
      4648 9584 4632 9564 4612 9614
TIME...MOT...LOC 0041Z 322DEG 18KT 4632 9613 

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

JH

513 
WWUS53 KFGF 220058
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
758 PM CDT FRI JUL 21 2017

MNC111-167-220107-
/O.EXP.KFGF.SV.W.0111.000000T0000Z-170722T0100Z/
Otter Tail MN-Wilkin MN-
758 PM CDT FRI JUL 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN OTTER TAIL AND
EAST CENTRAL WILKIN COUNTIES WILL EXPIRE AT 800 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.

A severe thunderstorm watch remains in effect until 1100 PM CDT for
west central Minnesota.

LAT...LON 4638 9641 4640 9628 4640 9616 4644 9604
      4648 9584 4632 9564 4612 9614
TIME...MOT...LOC 0057Z 325DEG 17KT 4624 9620 

$$

JH

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 21, 3:48 PM CDT, 3 hours 9 minutes earlier.

Area forecast discussion, Jul 21, 3:48 PM CDT, 3 hours 9 minutes before

Area Forecast Discussion
National Weather Service Grand Forks ND
348 PM CDT Fri Jul 21 2017

.SHORT TERM...(This evening through Saturday)
Issued at 341 PM CDT Fri Jul 21 2017

Still many questions in regards to convection thru the night.
Boundary located from Red Lake MN west to near Cooperstown ND. a
bit more east wind north of this boundary from earlier convection
while south winds south of this boundary with temps mid 80s to low
90s. Sfc based cape 3-4k in the RRV but where storms are nr
Cooperstown/Carrington some cap exists and still not certain
storms are rooted in boundary layer yet. Storms east toward GFK
into Crookston was elevated.

Overnight storms that are expected to fire in Manitoba may drop
southeast into NE ND but that again is not certain.

Breezy and cooler Saturday with risk of a few showers or t-storms
in NW MN.

.LONG TERM...(Saturday night through Friday)
Issued at 341 PM CDT Fri Jul 21 2017

Sunday a cool day compared to normal and then next wave with tstm
chance arriving into central/ern ND late Monday aftn and moving
east. For Tues-Fri relatively quite pattern.

&&

.AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon)
Issued at 111 PM CDT Fri Jul 21 2017

VFR thru the pd outside of the t-storms where cigs/wind variable.

&&

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

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

Hazardous weather outlook, Jul 21, 4:45 AM CDT, 14 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
445 AM CDT Fri Jul 21 2017

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-221200-
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 County-Eddy-Nelson-
Grand Forks-Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-
Richland-Western Walsh County-
445 AM CDT Fri Jul 21 2017

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

.DAY ONE...Today and Tonight

Severe thunderstorms are likely this afternoon and evening across
the region. However, details such as coverage, timing, and exact
location are still uncertain. The potential exists for hail up to
2 inches in diameter or greater, winds up to 75 mph, tornadoes,
and localized heavy rainfall.

Heat index values will approach 100 degrees across portions of the
area.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The potential exists for scattered severe thunderstorms Saturday
afternoon across the northern Red River Valley and northwest
Minnesota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is expected this afternoon.

TG

In the hours before

Local storm report, Jul 21, 5:52 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
552 PM CDT FRI JUL 21 2017

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

0545 PM     HAIL             3 ENE CALLAWAY          47.00N 95.85W
07/21/2017  E1.00 INCH       BECKER             MN   PUBLIC

            VERY HEAVY RAIN AND A FEW LARGE HAIL.

&&

GGUST

Local storm report, Jul 21, 5:59 PM CDT, 58 minutes before

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

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

0345 PM     TORNADO          8 W KELLIHER            47.94N 94.62W
07/21/2017                   BELTRAMI           MN   PUBLIC

            MULTIPLE BRIEF TOUCHDOWNS OBSERVED OVER A HALF MINUTE
            PERIOD. GRAIN BINS AND OTHER FARM BUILDINGS DAMAGED.

&&

GGUST

Local storm report, Jul 21, 6:05 PM CDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
605 PM CDT FRI JUL 21 2017

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

0420 PM     TSTM WND DMG     ERSKINE                 47.66N 96.01W
07/21/2017                   POLK               MN   BROADCAST MEDIA

            NUMEROUS LARGE BRANCHES BROKEN DOWN AROUND TOWN.

&&

GGUST

Local storm report, Jul 21, 6:09 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
609 PM CDT FRI JUL 21 2017

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

0540 PM     TSTM WND DMG     5 N BEMIDJI             47.55N 94.88W
07/21/2017                   BELTRAMI           MN   EMERGENCY MNGR

            NUMEROUS LARGE TREE BRANCHES AND LIMBS BROKEN DOWN. POWER
            OUTAGES.

&&

GGUST

Local storm report, Jul 21, 6:20 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
620 PM CDT FRI JUL 21 2017

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

0610 PM     HAIL             11 SW HANKINSON         45.96N 97.06W
07/21/2017  E1.00 INCH       RICHLAND           ND   PUBLIC

            MOSTLY PEA TO DIME SIZE.

&&

VGODON

Local storm report, Jul 21, 6:45 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
645 PM CDT FRI JUL 21 2017

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

0522 PM     TSTM WND GST     3 E BECIDA              47.35N 95.02W
07/21/2017  E75 MPH          HUBBARD            MN   TRAINED SPOTTER

            METAL ROOFING PANELS TORN OFF OF A BARN. LOCATION AND
            TIME ESTIMATED PENDING FURTHER REPORTING.

&&

GGUST

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 1:12 PM CDT	Special Weather Statement	FGF	Roseau	63 min
Jul 21, 1:57 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Lake of the Woods, Marshall	46 min
Jul 21, 3:37 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami	23 min
Jul 21, 4:10 PM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk	65 min
Jul 21, 4:15 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Polk, Red Lake	60 min
Jul 21, 4:51 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Beltrami, Clearwater, Hubbard, Mahnomen, Polk	54 min
Jul 21, 4:51 PM CDT	Severe Thunderstorm Warning	FGF	Clay	54 min
Jul 21, 5:18 PM CDT	Special Weather Statement	FGF	Norman	57 min
Jul 21, 5:22 PM CDT	Special Weather Statement	FGF	Beltrami	53 min
Jul 21, 5:29 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Mahnomen	61 min
Jul 21, 5:44 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Hubbard	35 min
Jul 21, 5:49 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Otter Tail, Wilkin	56 min
Jul 21, 6:28 PM CDT	Severe Thunderstorm Warning	FGF	Becker	31 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.