Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 27, NWS Grand Forks, ND

July 10, 2011Sargent County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 10, 2011, 4:47 PM CDT for Sargent County, North Dakota. It was in force for 43 min. 7 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 10, 2011, 4:47 PM CDT (21:47 UTC)
Expired: Jul 10, 2011, 5:30 PM CDT
In force: 43 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon

County Sargent County, ND

The radar

The Aberdeen radar (KABR), 80 km from the middle of the area, began a volume at 21:48 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 10, 5:00 PM CDT	TSTM WND DMG	Forman, ND	SOME HOUSES MISSING SHINGLES OFF ROOF. LARGE TREES DOWN IN TOWN.
Jul 10, 5:06 PM CDT	TSTM WND GST 60	Cogswell, ND	LAW ENFORCEMENT ESTIMATES 60 MPH WIND GUST
Jul 10, 5:10 PM CDT	TSTM WND DMG	2 W Havana, ND	ROOF BLOWN OFF MACHINE SHOP. TIME APPROXIMATE.
Jul 10, 5:15 PM CDT	TSTM WND DMG	Havana, ND	ROOF ON GRAIN BIN COLLAPSED
Jul 10, 5:17 PM CDT	TSTM WND GST 70	3 E Gwinner, ND	TRAINED SPOTTER ESTIMATES 70 MPH WIND GUST THAT HAS KNOCKED OVER LARGE TREE BRANCHES
Jul 10, 5:30 PM CDT	TSTM WND DMG	2 S Forman, ND	BARN AND FOUR GRAIN BINS BLOWN OFF THEIR FOUNDATIONS. POLE BARN LOST ITS ROOF. SEVERAL TREES UPROOTED AND BRANCHES UP TO A FOOT IN DIAMETER SNAPPED. ESTIMATED WIND GUSTS AT 70 MPH. TIME IS ESTIMATED.
Jul 10, 5:38 PM CDT	TSTM WND DMG	Cayuga, ND	REPORT OF TREES DOWN IN CAYUGA

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 10, 2:29 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 9.8 hours before the alert went out and 135 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: 1313 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

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

147 
WFUS53 KFGF 102147
TORFGF
NDC081-102230-
/O.NEW.KFGF.TO.W.0027.110710T2147Z-110710T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
447 PM CDT SUN JUL 10 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  SARGENT COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 530 PM CDT

* AT 442 PM CDT...STORM SPOTTERS OBSERVED AND NATIONAL WEATHER
  SERVICE DOPPLER RADAR INDICATED A TORNADO. THE DANGEROUS STORM WAS
  LOCATED 3 MILES NORTHEAST OF OAKES...OR 52 MILES SOUTH OF VALLEY
  CITY. RADAR SHOWED THE TORNADO WAS MOVING TO THE EAST AT 30 MPH.

  AT 435 PM CDT...LAW ENFORCEMENT REPORTED A TORNADO NEAR THE CITY
  OF OAKES. 

* THE TORNADIC STORM WILL BE NEAR...
  CRETE AROUND 450 PM CDT.
  STRAUBVILLE AND STIRUM AROUND 500 PM CDT.
  COGSWELL AROUND 505 PM CDT.
  BRAMPTON AROUND 510 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE GWINNER...FORMAN...HAVANA AND MILNOR.

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 4593 9801 4594 9802 4628 9802 4628 9739
      4593 9735 4593 9772
TIME...MOT...LOC 2145Z 281DEG 28KT 4617 9801

$$

HOPKINS

1 follow-up statement

793 
WWUS53 KFGF 102214
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
514 PM CDT SUN JUL 10 2011

NDC081-102230-
/O.CON.KFGF.TO.W.0027.000000T0000Z-110710T2230Z/
SARGENT ND-
514 PM CDT SUN JUL 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SARGENT COUNTY IN
SOUTHEAST NORTH DAKOTA UNTIL 530 PM CDT...

AT 510 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WIDESPREAD STRAIGHT
LINE WIND DAMAGE AND BRIEF TORNADOES 2 MILES WEST OF FORMAN...OR 53
MILES WEST OF WAHPETON...MOVING TO THE EAST AT 35 MPH.

AT 502 PM CDT, A FUNNEL CLOUD WAS REPORTED IN COGSWELL BY SHERIFFS 
DEPUTIES. IN ADDITION...AT 502 PM CDT, 60 MPH WINDS WERE REPORTED IN 
COGSWELL WITH THIS STORM.

THE STORM WILL BE NEAR...
  HAVANA AROUND 520 PM CDT.
  MILNOR AND RUTLAND AROUND 525 PM CDT.
  CAYUGA AROUND 530 PM CDT.

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 4593 9796 4627 9792 4628 9739 4593 9735
      4593 9772
TIME...MOT...LOC 2212Z 283DEG 31KT 4610 9766

$$

HOPKINS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 4:15 PM CDT	Tornado Warning	FGF	Ransom	45 min
Jul 10, 4:43 PM CDT	Areal Flood Advisory	FGF	Ransom, Richland, Sargent	13 hr
Jul 10, 4:59 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	61 min
Jul 10, 5:24 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	66 min
Jul 10, 5:44 PM CDT	Tornado Warning	FGF	Richland	36 min
Jul 10, 6:07 PM CDT	Severe Thunderstorm Warning	FGF	Richland	53 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.