Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 70, NWS Grand Forks, ND

July 12, 2012Lake of the Woods County, Roseau County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 12, 2012, 5:41 PM CDT for Lake of the Woods County, Roseau County, Minnesota. It was in force for 25 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, 5:41 PM CDT (22:41 UTC)
Expired: Jul 12, 2012, 6:06 PM CDT
In force: 25 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Lake of the Woods County, MN, Roseau County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 244 km from the middle of the area, began a volume at 22:42 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, 5:45 PM CDT	HAIL 0.88	Warroad, MN
Jul 12, 5:50 PM CDT	TSTM WND GST 60	Warroad, MN	REPORT RELAYED VIA FACEBOOK. PEA TO NICKEL SIZE HAIL ALSO REPORTED.

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, 10.7 hours before the alert went out and 129 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.

962 
WUUS53 KFGF 122241
SVRFGF
MNC077-135-122345-
/O.NEW.KFGF.SV.W.0070.120712T2241Z-120712T2345Z/

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LAKE OF THE WOODS COUNTY IN NORTH CENTRAL MINNESOTA...
  NORTHEASTERN ROSEAU COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 645 PM CDT

* AT 537 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 WARROAD...OR 21 MILES EAST OF ROSEAU...MOVING TO THE
  NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WILLIAMS AROUND 555 PM CDT.
  ARNESEN AROUND 610 PM CDT.
  LONG POINT AROUND 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4923 9478 4917 9478 4910 9474 4887 9467
      4883 9469 4879 9468 4871 9539 4900 9551
      4899 9519 4913 9504 4929 9482
TIME...MOT...LOC 2241Z 226DEG 17KT 4891 9528
WIND...HAIL 60MPH 1.50IN

$$

BRAMER

2 follow-up statements

615 
WWUS53 KFGF 122255
SVSFGF

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

MNC077-135-122345-
/O.CON.KFGF.SV.W.0070.000000T0000Z-120712T2345Z/
LAKE OF THE WOODS MN-ROSEAU MN-
555 PM CDT THU JUL 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
LAKE OF THE WOODS COUNTY IN NORTH CENTRAL MINNESOTA...AND
NORTHEASTERN ROSEAU COUNTY IN NORTHWEST MINNESOTA UNTIL 645 PM CDT...

AT 551 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 4
MILES NORTHEAST OF WARROAD...OR 24 MILES EAST OF ROSEAU...MOVING TO
THE NORTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ARNESEN AROUND 610 PM CDT.
  LONG POINT AROUND 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4923 9478 4917 9478 4910 9474 4886 9470
      4883 9539 4899 9547 4899 9519 4913 9504
      4929 9482
TIME...MOT...LOC 2255Z 226DEG 17KT 4897 9523
WIND...HAIL 60MPH 1.50IN

$$

BRAMER

177 
WWUS53 KFGF 122306
SVSFGF

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

MNC077-135-122315-
/O.CAN.KFGF.SV.W.0070.000000T0000Z-120712T2345Z/
LAKE OF THE WOODS MN-ROSEAU MN-
606 PM CDT THU JUL 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LAKE OF THE WOODS
COUNTY IN NORTH CENTRAL MINNESOTA...AND NORTHEASTERN ROSEAU COUNTY IN
NORTHWEST MINNESOTA IS CANCELLED...

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

LAT...LON 4923 9478 4917 9478 4910 9474 4886 9470
      4883 9539 4899 9547 4899 9519 4913 9504
      4929 9482
TIME...MOT...LOC 2305Z 226DEG 17KT 4900 9518

$$

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, 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, 6:39 PM CDT	Severe Thunderstorm Warning	FGF	Roseau	51 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.