Alert archive / Minnesota / Tornado Warnings in 2012

Tornado Warning 12, NWS Grand Forks, ND

August 3, 20124 counties in Minnesota

NWS Grand Forks, ND issued this tornado warning at Aug 3, 2012, 7:57 PM CDT for 4 counties in Minnesota. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 3, 2012, 7:57 PM CDT (00:57 UTC)
Expired
Aug 3, 2012, 8:45 PM CDT
In force
48 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon

Counties Becker County, MN, Clay County, MN, Mahnomen County, MN, Norman County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 109 km from the middle of the area, began a volume at 00:59 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 3, 2:14 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 1.0 hours before the alert went out and 242 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 00:00Z on 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 96 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.19395878Sfc1 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
96 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
1457 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

112 
WFUS53 KFGF 040057
TORFGF
MNC005-027-087-107-040145-
/O.NEW.KFGF.TO.W.0012.120804T0057Z-120804T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
757 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BECKER COUNTY IN NORTHWEST MINNESOTA...
  NORTHEASTERN CLAY COUNTY IN NORTHWEST MINNESOTA...
  MAHNOMEN COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN NORMAN COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 845 PM CDT

* AT 755 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM WAS
  LOCATED NEAR SYRE...OR 33 MILES NORTHWEST OF DETROIT LAKES...MOVING
  TO THE EAST AT 30 MPH.

* THE TORNADIC STORM WILL BE NEAR...
  FLOM AROUND 805 PM CDT.
  FAITH AROUND 815 PM CDT.
  MAHNOMEN AND WAUBUN AROUND 825 PM CDT.
  NAYTAHWAUSH AND BEAULIEU AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4744 9565 4717 9559 4709 9633 4726 9640
TIME...MOT...LOC 0058Z 254DEG 25KT 4720 9623

$$

TG
2 follow-up statements
748 
WWUS53 KFGF 040114
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
814 PM CDT FRI AUG 3 2012

MNC005-027-040124-
/O.CAN.KFGF.TO.W.0012.000000T0000Z-120804T0145Z/
CLAY MN-BECKER MN-
814 PM CDT FRI AUG 3 2012

...THE TORNADO WARNING FOR NORTHWESTERN BECKER AND NORTHEASTERN CLAY
COUNTIES IN NORTHWEST MINNESOTA IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4717 9559 4715 9604 4715 9611 4729 9623
      4744 9565
TIME...MOT...LOC 0114Z 254DEG 25KT 4723 9607

$$

MNC087-107-040145-
/O.CON.KFGF.TO.W.0012.000000T0000Z-120804T0145Z/
MAHNOMEN MN-NORMAN MN-
814 PM CDT FRI AUG 3 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN NORMAN AND
MAHNOMEN COUNTIES IN NORTHWEST MINNESOTA UNTIL 845 PM CDT...

AT 809 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES NORTH OF
FLOM...OR 31 MILES NORTHWEST OF DETROIT LAKES...MOVING TO THE EAST AT
30 MPH.

THE TORNADIC STORM WILL BE NEAR...
  MAHNOMEN AND WAUBUN AROUND 825 PM CDT.
  NAYTAHWAUSH AND BEAULIEU AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4717 9559 4715 9604 4715 9611 4729 9623
      4744 9565
TIME...MOT...LOC 0114Z 254DEG 25KT 4723 9607

$$

TG
202 
WWUS53 KFGF 040146
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
846 PM CDT FRI AUG 3 2012

MNC087-107-040156-
/O.EXP.KFGF.TO.W.0012.000000T0000Z-120804T0145Z/
MAHNOMEN MN-NORMAN MN-
846 PM CDT FRI AUG 3 2012

...THE TORNADO WARNING FOR SOUTHEASTERN NORMAN AND MAHNOMEN COUNTIES
IN NORTHWEST MINNESOTA HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4717 9559 4715 9604 4715 9611 4729 9623
      4744 9565
TIME...MOT...LOC 0114Z 254DEG 25KT 4723 9607

$$

ROGERS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:11 PM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen, Norman, Polk, Red Lake64 min
Aug 3, 7:20 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Hubbard, Otter Tail, Wadena, Wilkin55 min
Aug 3, 7:22 PM CDTTornado WarningFGFClearwater, Polk, Red Lake39 min
Aug 3, 7:32 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Mahnomen, Norman58 min
Aug 3, 7:44 PM CDTSevere Thunderstorm WarningFGFOtter Tail, Wilkin61 min
Aug 3, 7:54 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Pennington, Polk, Red Lake66 min
Aug 3, 8:06 PM CDTSevere Thunderstorm WarningFGFGrant, Otter Tail, Wilkin54 min
Aug 3, 8:12 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Clearwater, Hubbard, Otter Tail, Wadena63 min
Aug 3, 8:20 PM CDTSevere Thunderstorm WarningFGFBecker, Beltrami, Clearwater, Hubbard, Mahnomen, Norman and 1 more55 min
Aug 3, 8:27 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Lake of the Woods, Marshall, Roseau63 min

Nearby

Tornado Warnings in Minnesota, 2012Every tornado warning in 2012Tornadoes in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.