Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 71, NWS Grand Forks, ND

July 12, 2012Roseau County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 12, 2012, 6:39 PM CDT for Roseau County, Minnesota. It was in force for 51 min. 2 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 12, 2012, 6:39 PM CDT (23:39 UTC)
Expired: Jul 12, 2012, 7:30 PM CDT
In force: 51 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Roseau County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 179 km from the middle of the area, began a volume at 23:42 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 12, 6:40 PM CDT	HAIL 1	2 S Haug, MN
Jul 12, 6:50 PM CDT	FUNNEL CLOUD	5 Nnw Greenbush, MN	TRAINED SPOTTER REPORTED FUNNEL CLOUD IN PROGRESS.

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

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 11.7 hours before the alert went out and 211 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: 80 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 1401 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

362 
WUUS53 KFGF 122339
SVRFGF
MNC135-130030-
/O.NEW.KFGF.SV.W.0071.120712T2339Z-120713T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
639 PM CDT THU JUL 12 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ROSEAU COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 730 PM CDT

* AT 638 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS
  LOCATED NEAR HAUG...OR 20 MILES WEST OF ROSEAU...MOVING TO THE
  NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PINECREEK AROUND 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4900 9591 4868 9604 4869 9637 4901 9640
      4901 9623 4901 9619 4901 9591
TIME...MOT...LOC 2339Z 191DEG 21KT 4881 9619
WIND...HAIL 60MPH 1.50IN

$$

BRAMER

3 follow-up statements

923 
WWUS53 KFGF 122356
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
656 PM CDT THU JUL 12 2012

MNC135-130030-
/O.CON.KFGF.SV.W.0071.000000T0000Z-120713T0030Z/
ROSEAU MN-
656 PM CDT THU JUL 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
ROSEAU COUNTY IN NORTHWEST MINNESOTA UNTIL 730 PM CDT...

AT 652 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STORM WAS LOCATED 5 MILES
NORTH OF HAUG...OR 19 MILES WEST OF ROSEAU...MOVING TO THE NORTH AT
25 MPH.

IN ADDITION...AT 640 PM CDT QUARTER SIZED WAS REPORTED 2 MILES SOUTH 
OF HAUG WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PINECREEK AROUND 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4900 9591 4876 9602 4877 9636 4901 9640
      4901 9591
TIME...MOT...LOC 2356Z 191DEG 21KT 4891 9616
WIND...HAIL 60MPH 1.00IN

$$

BRAMER

093 
WWUS53 KFGF 122359 AAA
SVSFGF

SEVERE WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
659 PM CDT THU JUL 12 2012

MNC135-130030-
/O.CON.KFGF.SV.W.0071.000000T0000Z-120713T0030Z/
ROSEAU MN-
659 PM CDT THU JUL 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
ROSEAU COUNTY IN NORTHWEST MINNESOTA UNTIL 730 PM CDT...

AT 652 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STORM WAS LOCATED 5 MILES
NORTH OF HAUG...OR 19 MILES WEST OF ROSEAU...MOVING TO THE NORTH AT
25 MPH.

IN ADDITION...AT 640 PM CDT QUARTER SIZED HAIL WAS REPORTED 2 MILES 
SOUTH OF HAUG WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PINECREEK AROUND 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4900 9591 4876 9602 4877 9636 4901 9640
      4901 9591
TIME...MOT...LOC 2356Z 191DEG 21KT 4891 9616
WIND...HAIL 60MPH 1.00IN

$$

BRAMER

113 
WWUS53 KFGF 130027
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
727 PM CDT THU JUL 12 2012

MNC135-130037-
/O.EXP.KFGF.SV.W.0071.000000T0000Z-120713T0030Z/
ROSEAU MN-
727 PM CDT THU JUL 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ROSEAU COUNTY IN
NORTHWEST MINNESOTA WILL EXPIRE AT 730 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4900 9591 4876 9602 4877 9636 4901 9640
      4901 9591
TIME...MOT...LOC 0027Z 191DEG 21KT 4909 9611

$$

BRAMER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 4:15 PM CDT	Tornado Warning	FGF	Polk	45 min
Jul 12, 4:22 PM CDT	Special Weather Statement	FGF	Norman	53 min
Jul 12, 5:03 PM CDT	Severe Thunderstorm Warning	FGF	Polk	57 min
Jul 12, 5:21 PM CDT	Special Weather Statement	FGF	Kittson	54 min
Jul 12, 5:41 PM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods, Roseau	25 min
Jul 12, 6:10 PM CDT	Special Weather Statement	FGF	Lake of the Woods	65 min
Jul 12, 6:15 PM CDT	Special Weather Statement	FGF	Polk	60 min
Jul 12, 6:18 PM CDT	Special Weather Statement	FGF	Norman	57 min
Jul 12, 6:22 PM CDT	Special Weather Statement	FGF	Kittson	53 min
Jul 12, 6:45 PM CDT	Severe Thunderstorm Warning	FGF	Clay	60 min
Jul 12, 6:47 PM CDT	Severe Thunderstorm Warning	FGF	Norman	35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.