Alert archive / Minnesota / Tornado Warnings in 2011

Tornado Warning 50, NWS Grand Forks, ND

July 20, 2011Roseau County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 20, 2011, 8:27 AM CDT for Roseau County, Minnesota. It was in force for 48 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 20, 2011, 8:27 AM CDT (13:27 UTC)
Expired
Jul 20, 2011, 9:15 AM CDT
In force
48 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon

County Roseau County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 206 km from the middle of the area, began a volume at 13:30 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

TimeReportWhereRemark
Jul 20, 8:34 AM CDTTSTM WND DMGBadger, MN4 TO 6 INCH DIAMETER TREE LIMBS BROKEN OFF DURING STORM.
Jul 20, 8:40 AM CDTTSTM WND DMG4 N Wannaska, MNLARGE TREES...GREATER THAN A FOOT IN DIAMETER...BLOWN DOWN.
Jul 20, 8:45 AM CDTTSTM WND GST 602 N Roseau, MNDIME SIZE HAIL ACCOMPANIED WIND

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.

IssuedProductOfficeLasted
Jul 20, 5:25 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 1.5 hours before the alert went out and 165 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-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 2011-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3428 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 2011-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3428 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.5

Open this sounding in Storm Lab

The text

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

522 
WFUS53 KFGF 201327
TORFGF
MNC135-201415-
/O.NEW.KFGF.TO.W.0050.110720T1327Z-110720T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
827 AM CDT WED JUL 20 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL ROSEAU COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 915 AM CDT

* AT 825 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM WAS
  LOCATED 2 MILES EAST OF BADGER...OR 11 MILES SOUTHWEST OF ROSEAU...
  MOVING TO THE EAST AT 40 MPH.

* THE TORNADIC STORM WILL BE NEAR...
  ROSS AROUND 835 AM CDT.
  ROSEAU AND MALUNG AROUND 840 AM CDT.
  PENCER AROUND 845 AM CDT.
  SALOL AROUND 855 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE TORNADIC STORM
INCLUDE WARROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4897 9533 4895 9531 4892 9532 4890 9528
      4872 9524 4867 9610 4885 9617 4901 9557
      4901 9543 4900 9539 4900 9533
TIME...MOT...LOC 1327Z 251DEG 35KT 4879 9595

$$

GROCHOCINSKI
4 follow-up statements
204 
WWUS53 KFGF 201336
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
836 AM CDT WED JUL 20 2011

MNC135-201415-
/O.CON.KFGF.TO.W.0050.000000T0000Z-110720T1415Z/
ROSEAU MN-
836 AM CDT WED JUL 20 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN ROSEAU COUNTY IN
NORTHWEST MINNESOTA UNTIL 915 AM CDT...

AT 830 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES SOUTH OF
FOX...OR 8 MILES SOUTHWEST OF ROSEAU...MOVING TO THE EAST AT 40 MPH.

THE TORNADIC STORM WILL BE NEAR...
  ROSEAU AND MALUNG AROUND 840 AM CDT.
  PENCER AROUND 845 AM CDT.
  SALOL AROUND 855 AM CDT.
  WARROAD AROUND 910 AM CDT.

AT 832 AM CDT...A WEATHER SPOTTER REPORTED 4 TO 6 INCH TREE BRANCHES 
DOWN IN BADGER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4897 9533 4895 9531 4892 9532 4890 9528
      4872 9524 4867 9610 4885 9617 4901 9557
      4901 9543 4900 9539 4900 9533
TIME...MOT...LOC 1335Z 251DEG 35KT 4880 9583

$$

GROCHOCINSKI/KAISER
359 
WWUS53 KFGF 201345
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
845 AM CDT WED JUL 20 2011

MNC135-201415-
/O.CON.KFGF.TO.W.0050.000000T0000Z-110720T1415Z/
ROSEAU MN-
845 AM CDT WED JUL 20 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL ROSEAU COUNTY IN
NORTHWEST MINNESOTA UNTIL 915 AM CDT...

AT 844 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES NORTH OF
ROSEAU...MOVING TO THE EAST AT 40 MPH.

THE TORNADIC STORM WILL BE NEAR...
  SALOL AROUND 855 AM CDT.
  WARROAD AROUND 910 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.

&&

LAT...LON 4900 9533 4897 9533 4895 9531 4892 9532
      4890 9528 4879 9526 4877 9596 4889 9602
      4890 9601 4901 9557
TIME...MOT...LOC 1345Z 251DEG 35KT 4889 9573

$$

GROCHOCINSKI
627 
WWUS53 KFGF 201400
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
900 AM CDT WED JUL 20 2011

MNC135-201415-
/O.CON.KFGF.TO.W.0050.000000T0000Z-110720T1415Z/
ROSEAU MN-
900 AM CDT WED JUL 20 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL ROSEAU
COUNTY IN NORTHWEST MINNESOTA UNTIL 915 AM CDT...

AT 858 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES NORTH OF
SALOL...OR 9 MILES NORTHEAST OF ROSEAU...MOVING TO THE EAST AT 45
MPH.

THE TORNADIC STORM WILL BE NEAR...
  WARROAD AROUND 915 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.

&&

LAT...LON 4900 9539 4900 9533 4895 9531 4892 9532
      4890 9528 4886 9527 4887 9579 4894 9585
      4901 9557
TIME...MOT...LOC 1400Z 253DEG 37KT 4893 9557

$$

GROCHOCINSKI
675 
WWUS53 KFGF 201413 RRA
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
913 AM CDT WED JUL 20 2011

MNC135-201424-
/O.EXP.KFGF.TO.W.0050.000000T0000Z-110720T1415Z/
ROSEAU MN-
913 AM CDT WED JUL 20 2011

...THE TORNADO WARNING FOR NORTH CENTRAL ROSEAU COUNTY IN NORTHWEST
MINNESOTA WILL EXPIRE AT 915 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4900 9539 4900 9533 4895 9531 4892 9532
      4890 9528 4886 9527 4887 9579 4894 9585
      4901 9557
TIME...MOT...LOC 1414Z 253DEG 37KT 4896 9535

$$

GROCHOCINSKI/KAISER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 6:40 AM CDTSevere Thunderstorm WarningFGFMarshall, Polk50 min
Jul 20, 7:24 AM CDTSevere Thunderstorm WarningFGFKittson, Marshall, Roseau51 min
Jul 20, 7:41 AM CDTSevere Thunderstorm WarningFGFKittson, Roseau34 min
Jul 20, 7:59 AM CDTSevere Thunderstorm WarningFGFBeltrami, Kittson, Lake of the Woods, Marshall, Roseau61 min
Jul 20, 8:08 AM CDTSevere Thunderstorm WarningFGFKittson, Marshall67 min
Jul 20, 8:58 AM CDTSevere Thunderstorm WarningFGFLake of the Woods, Roseau47 min
Jul 20, 8:59 AM CDTAreal Flood AdvisoryFGFBeltrami, Kittson, Lake of the Woods, Marshall, Roseau6 hr
Jul 20, 9:16 AM CDTSevere Thunderstorm WarningFGFLake of the Woods, Roseau44 min
Jul 20, 10:49 AM CDTRiver Flood WatchFGFPolk47 hr
Jul 20, 10:49 AM CDTRiver Flood WatchFGFMarshall, Polk47 hr

Nearby

Tornado Warnings in Minnesota, 2011Every tornado warning in 2011Tornadoes 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.