Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 41, NWS Grand Forks, ND

July 17, 2011Barnes County, Griggs County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 17, 2011, 2:24 PM CDT for Barnes County, Griggs County, North Dakota. It was in force for 36 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 17, 2011, 2:24 PM CDT (19:24 UTC)
Expired: Jul 17, 2011, 3:00 PM CDT
In force: 36 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon

Counties Barnes County, ND, Griggs County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 83 km from the middle of the area, began a volume at 19:27 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, 2:35 PM CDT	TORNADO 0	1 Sw Sutton, ND	THIS TORNADO TRACKED INTERMITTENTLY FOR ABOUT 5 MILES TO AROUND 2 WSW OF REVERE BY 250 PM CDT. SEVERAL TREES WERE KNOCKED DOWN IN SHELTER BELTS ALONG THE ROUTE. MAXIMUM WIDTH ESTIMATED AT 100 YARDS AND PEAK WINDS ESTIMATED TO 85 MPH.

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
Jul 17, 9:58 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 17, 12:49 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.4 hours before the alert went out and 186 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: 4227 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1037 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 37.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

745 
WFUS53 KFGF 171924
TORFGF
NDC003-039-172000-
/O.NEW.KFGF.TO.W.0041.110717T1924Z-110717T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
224 PM CDT SUN JUL 17 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BARNES COUNTY IN SOUTHEAST NORTH DAKOTA...
  SOUTHERN GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 300 PM CDT

* AT 218 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO. THE DANGEROUS STORM WAS LOCATED 5 MILES WEST OF
  SUTTON...OR 40 MILES NORTHWEST OF VALLEY CITY. RADAR SHOWED THE
  TORNADO WAS MOVING TO THE SOUTHEAST AT 25 MPH.

  AT 108 PM CDT...TORNADO DAMAGE WAS REPORTED 4 MILES SOUTH OF NEW
  ROCKFORD. 

* THE TORNADIC STORM WILL BE NEAR...
  SUTTON AROUND 225 PM CDT.
  REVERE AROUND 235 PM CDT.
  WIMBLEDON AROUND 240 PM CDT.
  HANNAFORD AROUND 250 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE WALUM AND ROGERS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES
FOR A STURDY BUILDING.

TO REPEAT...A TORNADO HAS BEEN OBSERVED. TAKE COVER NOW. MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF YOU ARE IN A MOBILE HOME...A VEHICLE...OR OUTDOORS...MOVE
TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING
DEBRIS.

&&

LAT...LON 4755 9851 4742 9810 4693 9808 4708 9848
      4732 9848 4732 9849
TIME...MOT...LOC 1920Z 303DEG 25KT 4737 9852

$$

HOPKINS

1 follow-up statement

149 
WWUS53 KFGF 171949
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
249 PM CDT SUN JUL 17 2011

NDC003-039-172000-
/O.CON.KFGF.TO.W.0041.000000T0000Z-110717T2000Z/
BARNES ND-GRIGGS ND-
249 PM CDT SUN JUL 17 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN GRIGGS AND
NORTHWESTERN BARNES COUNTIES IN SOUTHEAST NORTH DAKOTA UNTIL 300 PM
CDT...

AT 246 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES SOUTHWEST
OF REVERE...OR 33 MILES NORTHWEST OF VALLEY CITY...MOVING TO THE
SOUTHEAST AT 25 MPH.

THE TORNADIC STORM WILL BE NEAR...
  WIMBLEDON AROUND 255 PM CDT.
  WALUM...ROGERS AND LEAL AROUND 300 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE HANNAFORD AND DAZEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES
FOR A STURDY BUILDING.

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4755 9851 4742 9810 4693 9808 4708 9848
      4732 9848 4732 9849
TIME...MOT...LOC 1949Z 303DEG 25KT 4731 9837

$$

HOPKINS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 7:10 PM CDT	Tornado Warning	FGF	Griggs	50 min
Jul 16, 7:53 PM CDT	Tornado Warning	FGF	Benson, Ramsey	52 min
Jul 16, 8:36 PM CDT	Tornado Warning	FGF	Benson, Ramsey	39 min
Jul 16, 9:24 PM CDT	Tornado Warning	FGF	Benson, Nelson, Ramsey	51 min
Jul 16, 10:02 PM CDT	Flash Flood Warning	FGF	Nelson, Ramsey	10 hr
Jul 16, 10:41 PM CDT	Areal Flood Advisory	FGF	Pembina, Walsh	8 hr
Jul 16, 11:08 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	52 min
Jul 17, 11:45 AM CDT	Severe Thunderstorm Warning	FGF	Benson	60 min
Jul 17, 12:33 PM CDT	Tornado Warning	FGF	Eddy	42 min
Jul 17, 1:11 PM CDT	Tornado Warning	FGF	Eddy	49 min
Jul 17, 2:57 PM CDT	Tornado Warning	FGF	Barnes, Griggs	48 min
Jul 17, 3:34 PM CDT	Tornado Warning	FGF	Barnes, Griggs, Steele	41 min
Jul 17, 4:12 PM CDT	Tornado Warning	FGF	Barnes, Cass	63 min
Jul 17, 5:13 PM CDT	Tornado Warning	FGF	Cass	45 min

Nearby

Tornado Warnings in North Dakota, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.