Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 101, NWS Grand Forks, ND

July 20, 2011Lake of the Woods County, Roseau County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 2011, 8:58 AM CDT for Lake of the Woods County, Roseau County, Minnesota. It was in force for 47 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: Jul 20, 2011, 8:58 AM CDT (13:58 UTC)
Expired: Jul 20, 2011, 9:45 AM CDT
In force: 47 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

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

The radar

The Fargo/Grand Forks radar (KMVX), 240 km from the middle of the area, began a volume at 13:58 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.

Issued	Product	Office	Lasted
Jul 20, 5:25 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 2.0 hours before the alert went out and 135 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: 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.

279 
WUUS53 KFGF 201358
SVRFGF
MNC077-135-201445-
/O.NEW.KFGF.SV.W.0101.110720T1358Z-110720T1445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
858 AM CDT WED JUL 20 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

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

* UNTIL 945 AM CDT

* AT 853 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. THE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES NORTHWEST OF WARROAD TO 3 MILES SOUTH OF LONG POINT TO
  NEAR PITT...MOVING TO THE NORTHEAST AT 50 MPH. ALSO NICKEL SIZE
  HAIL MAY ACCOMPANY THE DAMAGING WINDS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ANGLE INLET AROUND 925 AM CDT.
  PENASSE AND FLAG ISLAND AROUND 930 AM CDT.
  OAK ISLAND AROUND 935 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4932 9480 4917 9478
      4888 9467 4878 9468 4875 9463 4871 9453
      4857 9501 4882 9534 4900 9565 4901 9559
      4901 9516 4939 9516
TIME...MOT...LOC 1358Z 245DEG 45KT 4902 9538 4896 9487
          4875 9466
WIND...HAIL 60MPH 0.88IN

$$

GROCHOCINSKI

2 follow-up statements

707 
WWUS53 KFGF 201425
SVSFGF

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

MNC077-135-201445-
/O.CON.KFGF.SV.W.0101.000000T0000Z-110720T1445Z/
LAKE OF THE WOODS MN-ROSEAU MN-
925 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LAKE OF THE
WOODS COUNTY IN NORTH CENTRAL MINNESOTA...AND NORTHEASTERN ROSEAU
COUNTY IN NORTHWEST MINNESOTA UNTIL 945 AM CDT...

AT 921 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 10 MILES SOUTH OF ANGLE INLET TO 11 MILES NORTH OF LONG POINT TO
10 MILES NORTHEAST OF LONG POINT...MOVING TO THE NORTHEAST AT 55 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ANGLE INLET AROUND 930 AM CDT.
  PENASSE...OAK ISLAND AND FLAG ISLAND AROUND 935 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4932 9480 4917 9478
      4888 9467 4878 9468 4875 9463 4871 9453
      4857 9501 4882 9534 4900 9565 4901 9559
      4901 9516 4939 9516
TIME...MOT...LOC 1425Z 240DEG 46KT 4924 9506 4917 9487
          4906 9469

$$

GROCHOCINSKI

780 
WWUS53 KFGF 201440
SVSFGF

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

MNC077-135-201449-
/O.EXP.KFGF.SV.W.0101.000000T0000Z-110720T1445Z/
LAKE OF THE WOODS MN-ROSEAU MN-
940 AM CDT WED JUL 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR LAKE OF THE WOODS COUNTY IN
NORTH CENTRAL MINNESOTA...AND NORTHEASTERN ROSEAU COUNTY IN NORTHWEST
MINNESOTA WILL EXPIRE AT 945 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED
OUT OF THE WARNED AREA.

A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN ROSEAU 
AND WESTERN LAKE OF THE WOODS COUNTY DUE TO A DIFFERENT THUNDERSTORM.

LAT...LON 4936 9507 4938 9496 4932 9480 4917 9478
      4888 9467 4878 9468 4875 9463 4871 9453
      4857 9501 4882 9534 4900 9565 4901 9559
      4901 9516 4939 9516
TIME...MOT...LOC 1439Z 240DEG 46KT 4932 9481 4924 9462
          4913 9444

$$

GROCHOCINSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 6:40 AM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	50 min
Jul 20, 7:24 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Roseau	51 min
Jul 20, 7:41 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Roseau	34 min
Jul 20, 7:59 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Kittson, Lake of the Woods, Marshall, Roseau	61 min
Jul 20, 8:08 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall	67 min
Jul 20, 8:27 AM CDT	Tornado Warning	FGF	Roseau	48 min
Jul 20, 8:59 AM CDT	Areal Flood Advisory	FGF	Beltrami, Kittson, Lake of the Woods, Marshall, Roseau	6 hr
Jul 20, 9:16 AM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods, Roseau	44 min
Jul 20, 10:49 AM CDT	River Flood Watch	FGF	Polk	47 hr
Jul 20, 10:49 AM CDT	River Flood Watch	FGF	Marshall, Polk	47 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.