Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 93, NWS Grand Forks, ND

July 17, 2017Otter Tail County, Wadena County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 17, 2017, 3:26 PM CDT for Otter Tail County, Wadena County, Minnesota. It was in force for 64 min. 3 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: Jul 17, 2017, 3:26 PM CDT (20:26 UTC)
Expired: Jul 17, 2017, 4:30 PM CDT
In force: 64 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

Counties Otter Tail County, MN, Wadena County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 181 km from the middle of the area, began a volume at 20:29 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 17, 3:55 PM CDT	TSTM WND DMG	4 Wnw New York Mills, MN	SEMI TRUCK AND TRAILER COMBINATION BLOWN OVER ON U. S. HIGHWAY 10. TIME ESTIMATED BASED ON RADAR.
Jul 17, 4:10 PM CDT	HAIL 1.25	2 Nnw Bluffton, MN	HAIL OF QUARTER TO HALF DOLLAR SIZE.
Jul 17, 4:25 PM CDT	HAIL 0.75	Blue Grass, MN

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 29 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 17, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.4 hours before the alert went out and 238 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: 1041 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

255 
WUUS53 KFGF 172026
SVRFGF
MNC111-159-172130-
/O.NEW.KFGF.SV.W.0093.170717T2026Z-170717T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eastern ND/Grand Forks ND
326 PM CDT MON JUL 17 2017

The National Weather Service in Grand Forks has issued a

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

* Until 430 PM CDT.

* At 326 PM CDT, a severe thunderstorm was located near Perham, or 19
  miles southeast of Detroit Lakes, moving east at 30 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...
  Perham around 330 PM CDT. 
  New York Mills and Butler around 355 PM CDT. 
  Bluffton and Hillview around 405 PM CDT. 
  Sebeka around 425 PM CDT. 
  Blue Grass around 430 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4644 9573 4670 9574 4672 9544 4672 9517
      4674 9516 4675 9490 4641 9489
TIME...MOT...LOC 2026Z 268DEG 24KT 4658 9563 

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

VG

2 follow-up statements

715 
WWUS53 KFGF 172100
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
400 PM CDT MON JUL 17 2017

MNC111-159-172130-
/O.CON.KFGF.SV.W.0093.000000T0000Z-170717T2130Z/
Wadena MN-Otter Tail MN-
400 PM CDT MON JUL 17 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR WESTERN WADENA AND NORTHEASTERN OTTER TAIL COUNTIES...

At 359 PM CDT, a severe thunderstorm was located near New York Mills,
or 28 miles southeast of Detroit Lakes, moving east at 20 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...
  Hillview around 410 PM CDT. 
  Bluffton around 415 PM CDT. 
  Sebeka and Blue Grass around 430 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4644 9573 4670 9574 4672 9544 4672 9517
      4674 9516 4675 9490 4641 9489
TIME...MOT...LOC 2059Z 274DEG 19KT 4658 9534 

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

VG

757 
WWUS53 KFGF 172129
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
429 PM CDT MON JUL 17 2017

MNC111-159-172139-
/O.EXP.KFGF.SV.W.0093.000000T0000Z-170717T2130Z/
Wadena MN-Otter Tail MN-
429 PM CDT MON JUL 17 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN WADENA AND
NORTHEASTERN OTTER TAIL COUNTIES WILL EXPIRE AT 430 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
central, northwestern and west central Minnesota.

LAT...LON 4644 9573 4670 9574 4672 9544 4672 9517
      4674 9516 4675 9490 4641 9489
TIME...MOT...LOC 2129Z 268DEG 24KT 4659 9507 

$$

VG

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 17, 2:07 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 17, 2:07 PM CDT, 1 hour 19 minutes before

Area Forecast Discussion
National Weather Service Grand Forks ND
207 PM CDT Mon Jul 17 2017

.SHORT TERM...(This evening through Tuesday)
Issued at 121 PM CDT Mon Jul 17 2017

Expecting convective initiation 20-22z time frame as any cap
eroding and airmass continues to destabilize with around 5 more
degrees to reach convective temperatures. CAMs seem to have a
relatively good handle on expected outcome and makes sense
considering current conditions and expected frontal position.
Prime area for severe storms likely along and south of a Lisbon-
FAR- BJI line. Large hail and damaging winds main concern however
a little concerned with mini surface low over far se ND and
tornado potential so will be watching this area close. Convection
should propagate e-se through early evening so does not look like
a long lived event. More uncertain about later tonight as CAMs
farther north with next batch of shra/tsra associated with exit
region/nose of another jet streak.

Pop location across the south will be the main challenge for
tomorrow. Otherwise drier and cooler airmass working into the fa
should keep severe threat to our south. Generally kept pops along
and south of I94 for now. Temperatures will be at or a few degrees
blo seasonal averages.

.LONG TERM...(Tuesday night through Monday)
Issued at 121 PM CDT Mon Jul 17 2017

Surface high pressure is in control to start the period as the
upper pattern becomes more zonal and the jet sets up along the
international border. Models indicate a few waves propagating
through the flow...and the resultant instability will bring
chances for more precipitation on Wednesday...then again late
Friday and into Saturday. Temperatures for the remainder of the
period should be more seasonable...with highs in the 80s and lows
in the lower 60s through the end of the period.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 1253 PM CDT Mon Jul 17 2017

Best potential for redevelopment this afternoon will be roughly
along and south of a line from FAR to BJI with both sites on edge.
Added tempo or vc group into early evening. Otherwise VFR
conditions expected through the period.

&&

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

SHORT TERM...Voelker
LONG TERM...Hopkins
AVIATION...Voelker

Hazardous weather outlook, Jul 17, 6:22 AM CDT, 9 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
622 AM CDT Mon Jul 17 2017

NDZ006>008-014>016-024-026-028-054-181130-
Towner-Cavalier-Pembina-Benson-Ramsey-Eastern Walsh County-Eddy-
Nelson-Griggs-Western Walsh County-
622 AM CDT Mon Jul 17 2017

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

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

MNZ001>009-013>017-022>024-027>032-040-NDZ027-029-030-038-039-049-
052-053-181130-
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-Grand Forks-Steele-
Traill-Barnes-Cass-Ransom-Sargent-Richland-
622 AM CDT Mon Jul 17 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 expected this afternoon and evening over
the area. Thunderstorms are expected to develop after 3 PM CDT and
should end around 11 PM CDT. Hail to 2 inches in diameter and
wind gusts to 70 mph are forecast.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 4:30 AM CDT	Special Weather Statement	FGF	Mahnomen, Norman, Polk, Red Lake	60 min
Jul 17, 5:26 AM CDT	Special Weather Statement	FGF	Red Lake	49 min
Jul 17, 3:18 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wilkin	57 min
Jul 17, 4:24 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	66 min
Jul 17, 4:34 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	56 min
Jul 17, 4:38 PM CDT	Special Weather Statement	FGF	Wadena	67 min
Jul 17, 5:01 PM CDT	Areal Flood Advisory	FGF	Otter Tail	3 hr
Jul 17, 5:04 PM CDT	Areal Flood Advisory	FGF	Wadena	3 hr
Jul 17, 5:30 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	39 min
Jul 17, 6:05 PM CDT	Areal Flood Advisory	FGF	Otter Tail	115 min
Jul 17, 6:13 PM CDT	Areal Flood Advisory	FGF	Grant, Otter Tail	3 hr
Jul 17, 6:20 PM CDT	Special Weather Statement	FGF	Traverse	25 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.