Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 42, NWS Grand Forks, ND

September 19, 2017Polk County, Red Lake County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Sep 19, 2017, 8:16 PM CDT for Polk County, Red Lake County, Minnesota. It was in force for 44 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: Sep 19, 2017, 8:16 PM CDT (01:16 UTC)
Expired: Sep 19, 2017, 9:00 PM CDT
In force: 44 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Polk County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 91 km from the middle of the area, began a volume at 01:18 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
Sep 19, 8:50 PM CDT	TSTM WND DMG	3 S Brooks, MN	NUMEROUS 4 TO 6 INCH DIAMETER TREE BRANCHES AND LIMBS WERE BROKEN DOWN IN SHELTER BELTS ACROSS SOUTHERN POPLAR RIVER TOWNSHIP. THE NEARBY RWIS STATION LOST POWER AT THIS TIME PERIOD.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 19, 3:37 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 1.3 hours before the alert went out and 231 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: 77 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

825 
WFUS53 KFGF 200116
TORFGF
MNC119-125-200200-
/O.NEW.KFGF.TO.W.0042.170920T0116Z-170920T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
816 PM CDT TUE SEP 19 2017

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Central Red Lake County in northwestern Minnesota...
  Southeastern Polk County in northwestern Minnesota...

* Until 900 PM CDT.

* At 815 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Melvin, or 33 miles south of Thief River Falls,
  moving northeast at 35 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

* This dangerous storm will be near...
  Maple Bay around 820 PM CDT. 
  Dugdale around 825 PM CDT. 
  Mentor, Marcoux and Perault around 830 PM CDT. 
  Terrebonne around 840 PM CDT. 
  Brooks around 850 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4758 9623 4765 9649 4793 9617 4793 9565
TIME...MOT...LOC 0115Z 225DEG 31KT 4764 9632 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

TG

2 follow-up statements

730 
WWUS53 KFGF 200139
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
839 PM CDT TUE SEP 19 2017

MNC119-125-200200-
/O.CON.KFGF.TO.W.0042.000000T0000Z-170920T0200Z/
Red Lake MN-Polk MN-
839 PM CDT TUE SEP 19 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR CENTRAL
RED LAKE AND EAST CENTRAL POLK COUNTIES...
    
At 839 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Terrebonne, or 22 miles south of Thief River Falls,
moving northeast at 35 mph.

HAZARD...TORNADO. 

SOURCE...Radar indicated rotation. 

IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

This dangerous storm will be near...
  Terrebonne around 840 PM CDT. 
  Brooks around 845 PM CDT. 
  Plummer and Oklee around 855 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4766 9610 4778 9633 4793 9617 4793 9565
TIME...MOT...LOC 0139Z 225DEG 31KT 4779 9610 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

TG

424 
WWUS53 KFGF 200159
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
859 PM CDT TUE SEP 19 2017

MNC119-125-200208-
/O.EXP.KFGF.TO.W.0042.000000T0000Z-170920T0200Z/
Red Lake MN-Polk MN-
859 PM CDT TUE SEP 19 2017

...THE TORNADO WARNING FOR CENTRAL RED LAKE AND EAST CENTRAL POLK
COUNTIES WILL EXPIRE AT 900 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until midnight CDT for northwestern
Minnesota.

LAT...LON 4766 9610 4778 9633 4793 9617 4793 9565
TIME...MOT...LOC 0158Z 225DEG 31KT 4790 9593 

$$

TG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 7:23 PM CDT	Tornado Warning	FGF	Norman, Polk	52 min
Sep 19, 8:57 PM CDT	Areal Flood Advisory	FGF	Norman	5 hr
Sep 19, 9:02 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Mahnomen, Pennington, Polk, Red Lake	58 min
Sep 19, 9:52 PM CDT	High Wind Warning	FGF	Kittson, Roseau	97 min
Sep 19, 10:10 PM CDT	Special Weather Statement	FGF	Wilkin	35 min
Sep 19, 10:13 PM CDT	Special Weather Statement	FGF	Clay, Norman	32 min
Sep 19, 10:49 PM CDT	Special Weather Statement	FGF	Becker, Clearwater, Mahnomen	26 min
Sep 19, 10:50 PM CDT	Special Weather Statement	FGF	Grant, Otter Tail	25 min
Sep 19, 11:02 PM CDT	Special Weather Statement	FGF	Beltrami, Clearwater	28 min
Sep 19, 11:17 PM CDT	Special Weather Statement	FGF	Becker, Otter Tail	28 min
Sep 19, 11:18 PM CDT	Special Weather Statement	FGF	Clearwater, Mahnomen	27 min
Sep 19, 11:32 PM CDT	Special Weather Statement	FGF	Beltrami, Clearwater	58 min
Sep 19, 11:46 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	44 min
Sep 19, 11:49 PM CDT	Special Weather Statement	FGF	Becker, Clearwater, Hubbard	56 min
Sep 20, 12:26 AM CDT	Special Weather Statement	FGF	Otter Tail, Wadena	34 min

Nearby

Tornado Warnings in Minnesota, 2017 Every tornado warning in 2017 Tornadoes 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.