Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 46, NWS Grand Forks, ND

July 19, 2011Cass County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 19, 2011, 3:52 AM CDT for Cass County, North Dakota. It was in force for 38 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 19, 2011, 3:52 AM CDT (08:52 UTC)
Expired: Jul 19, 2011, 4:30 AM CDT
In force: 38 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 87 km from the middle of the area, began a volume at 08:54 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 19, 4:35 AM CDT	TSTM WND DMG	3 S West Fargo, ND	SECTIONS OF YARD FENCING WERE BLOWN DOWN BETWEEN 36TH AND 40TH AVENUES SOUTH. NUMEROUS 3-5 INCH BRANCHES WERE BROKEN DOWN.

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

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 8.9 hours before the alert went out and 239 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: 6467 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 10.1
Supercell composite: 42.1

Open this sounding in Storm Lab

The text

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

317 
WFUS53 KFGF 190852
TORFGF
NDC017-190930-
/O.NEW.KFGF.TO.W.0046.110719T0852Z-110719T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
352 AM CDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL CASS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 430 AM CDT

* AT 349 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM WAS
  LOCATED 3 MILES NORTHEAST OF DURBIN...OR 14 MILES WEST OF FARGO...
  MOVING TO THE EAST AT 10 MPH.

* THE TORNADIC STORM WILL BE NEAR...
  HORACE...WILD RICE AND WEST FARGO AROUND 430 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE PRAIRIE ROSE.

FOR MOTORISTS ON INTERSTATE 94...THE TORNADIC STORM WILL BE
BETWEEN...MILE MARKER 333 AROUND 350 AM CDT...AND MILE MARKER 352
AROUND 430 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4672 9719 4690 9719 4686 9677 4685 9678
      4682 9680 4677 9678 4671 9679
TIME...MOT...LOC 0852Z 270DEG 10KT 4683 9709

$$

TG

3 follow-up statements

047 
WWUS53 KFGF 190906
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
406 AM CDT TUE JUL 19 2011

NDC017-190930-
/O.CON.KFGF.TO.W.0046.000000T0000Z-110719T0930Z/
CASS ND-
406 AM CDT TUE JUL 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL CASS COUNTY
IN SOUTHEAST NORTH DAKOTA UNTIL 430 AM CDT...

AT 403 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES EAST OF
DURBIN...OR 13 MILES SOUTHWEST OF FARGO...MOVING TO THE SOUTHEAST AT
15 MPH.

THE TORNADIC STORM WILL BE NEAR...
  WEST FARGO AROUND 425 AM CDT.
  HORACE...WILD RICE AND PRAIRIE ROSE AROUND 430 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE OXBOW...FRONTIER AND BRIARWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4672 9719 4690 9719 4686 9677 4685 9678
      4682 9680 4677 9678 4671 9679
TIME...MOT...LOC 0906Z 300DEG 9KT 4679 9706

$$

JK

582 
WWUS53 KFGF 190921
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
421 AM CDT TUE JUL 19 2011

NDC017-190930-
/O.CON.KFGF.TO.W.0046.000000T0000Z-110719T0930Z/
CASS ND-
421 AM CDT TUE JUL 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL CASS COUNTY
IN SOUTHEAST NORTH DAKOTA UNTIL 430 AM CDT...

AT 417 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR HORACE...OR 9
MILES SOUTHWEST OF FARGO...MOVING TO THE SOUTHEAST AT 20 MPH.

THE TORNADIC STORM WILL BE NEAR...
  WILD RICE AND BRIARWOOD AROUND 425 AM CDT.

FOR MOTORISTS ON INTERSTATE 29...THE TORNADIC STORM WILL BE
BETWEEN...MILE MARKER 58 AROUND 420 AM CDT...AND MILE MARKER 54
AROUND 425 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4672 9719 4690 9719 4686 9677 4685 9678
      4682 9680 4677 9678 4671 9679
TIME...MOT...LOC 0920Z 299DEG 26KT 4674 9688

$$

JK

993 
WWUS53 KFGF 190930
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
430 AM CDT TUE JUL 19 2011

NDC017-190939-
/O.EXP.KFGF.TO.W.0046.000000T0000Z-110719T0930Z/
CASS ND-
430 AM CDT TUE JUL 19 2011

...THE TORNADO WARNING FOR EAST CENTRAL CASS COUNTY IN SOUTHEAST
NORTH DAKOTA WILL EXPIRE AT 430 AM CDT...

THE CIRCULATION IN THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED.

LAT...LON 4672 9719 4690 9719 4686 9677 4685 9678
      4682 9680 4677 9678 4671 9679
TIME...MOT...LOC 0929Z 298DEG 24KT 4672 9681

$$

JK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 2:25 AM CDT	Severe Thunderstorm Warning	FGF	Cass	65 min
Jul 19, 2:57 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Traill	63 min
Jul 19, 3:29 AM CDT	Severe Thunderstorm Warning	FGF	Cass	61 min
Jul 19, 4:17 AM CDT	Areal Flood Advisory	FGF	Cass	6 hr
Jul 19, 5:14 AM CDT	Flash Flood Warning	FGF	Cass	5 hr
Jul 19, 5:31 AM CDT	Flash Flood Warning	FGF	Cass	5 hr
Jul 19, 5:45 AM CDT	Flash Flood Warning	FGF	Cass	5 hr
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	6 days
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	6 days
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	50 hr

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.