Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 99, NWS Grand Forks, ND

July 20, 20115 counties in Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 2011, 7:59 AM CDT for 5 counties in Minnesota. It was in force for 61 min. 10 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, 7:59 AM CDT (12:59 UTC)
Expired: Jul 20, 2011, 9:00 AM CDT
In force: 61 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Beltrami County, MN, Kittson County, MN, Lake of the Woods County, MN, Marshall County, MN, Roseau County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 223 km from the middle of the area, began a volume at 13:02 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 20, 8:00 AM CDT	TSTM WND DMG	Greenbush, MN	TREES BLOWN DOWN ON CARS IN TOWN. EMPTY GRAIN BIN ROLLED.
Jul 20, 8:07 AM CDT	TSTM WND DMG	Greenbush, MN	EXTENSIVE TREE AND HOUSE DAMAGE IN GREENBUSH. TIME APPROXIMATE.
Jul 20, 8:10 AM CDT	TSTM WND DMG	Badger, MN	2.5 TO 3 FOOT DIAMETER TREES DOWN IN BADGER. TIME APPROXIMATED USING RADAR IMAGERY.
Jul 20, 8:10 AM CDT	TSTM WND GST 70	2 S Roseau, MN
Jul 20, 8:15 AM CDT	TSTM WND DMG	Roseau, MN	NUMEROUS TREES OF 4 INCH DIAMETER DOWN IN TOWN.
Jul 20, 8:19 AM CDT	TSTM WND DMG	Roseau, MN	4 INCH DIAMETER TREES DOWN
Jul 20, 8:25 AM CDT	TSTM WND DMG	Roseau, MN	6 TO 8 INCH DIAMETER TREES DOWN IN TOWN. ESTIMATED WIND GUSTS OF 30 TO 35 MPH.
Jul 20, 8:34 AM CDT	TSTM WND DMG	Badger, MN	4 TO 6 INCH DIAMETER TREE LIMBS BROKEN OFF DURING STORM.
Jul 20, 8:40 AM CDT	TSTM WND DMG	4 N Wannaska, MN	LARGE TREES...GREATER THAN A FOOT IN DIAMETER...BLOWN DOWN.
Jul 20, 8:45 AM CDT	TSTM WND GST 60	2 N Roseau, MN	DIME 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.

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, 1.0 hours before the alert went out and 145 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.

255 
WUUS53 KFGF 201259
SVRFGF
MNC007-069-077-089-135-201400-
/O.NEW.KFGF.SV.W.0099.110720T1259Z-110720T1400Z/

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BELTRAMI COUNTY IN NORTH CENTRAL MINNESOTA...
  EAST CENTRAL KITTSON COUNTY IN NORTHWEST MINNESOTA...
  LAKE OF THE WOODS COUNTY IN NORTH CENTRAL MINNESOTA...
  EASTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA...
  ROSEAU COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 900 AM CDT

* AT 753 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 10 MILES NORTHEAST OF LAKE
  BRONSON TO 5 MILES SOUTH OF GREENBUSH TO 4 MILES NORTH OF HOLT...
  MOVING TO THE NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BADGER AROUND 805 AM CDT.
  GRYGLA...GATZKE AND FOX AROUND 810 AM CDT.
  ROSEAU...WANNASKA AND TORFIN AROUND 815 AM CDT.
  SKIME...SALOL AND PENCER AROUND 820 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORMS
INCLUDE ROSS...FOURTOWN...MALCOLM...GATES CORNER...WARROAD AND SWIFT.

THESE THUNDERSTORMS ARE PRODUCING FREQUENT LIGHTNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4933 9482 4914 9477
      4888 9467 4878 9468 4873 9458 4870 9443
      4825 9442 4826 9625 4862 9618 4886 9661
      4901 9623 4901 9516 4939 9516
TIME...MOT...LOC 1259Z 239DEG 59KT 4886 9636 4868 9603
          4841 9609
WIND...HAIL 60MPH 1.00IN

$$

GROCHOCINSKI

3 follow-up statements

552 
WWUS53 KFGF 201312
SVSFGF

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

MNC007-069-077-089-135-201400-
/O.CON.KFGF.SV.W.0099.000000T0000Z-110720T1400Z/
LAKE OF THE WOODS MN-KITTSON MN-ROSEAU MN-BELTRAMI MN-MARSHALL MN-
812 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
BELTRAMI AND LAKE OF THE WOODS COUNTIES IN NORTH CENTRAL MINNESOTA...
AND EASTERN MARSHALL...ROSEAU AND EAST CENTRAL KITTSON COUNTIES IN
NORTHWEST MINNESOTA UNTIL 900 AM CDT...

AT 807 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 70 MPH.  THE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM NEAR ROSS TO 3 MILES NORTHEAST OF
PENCER TO 6 MILES NORTHEAST OF GATZKE...MOVING TO THE NORTHEAST AT 55
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GATES CORNER AROUND 820 AM CDT.
  WARROAD AROUND 830 AM CDT.
  SWIFT AND OAKS CORNER AROUND 835 AM CDT.
  ARNESEN AROUND 840 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS
INCLUDE ROOSEVELT...FAUNCE...LONG POINT...WILLIAMS...PITT AND
GRACETON.

AT 810 AM...THE ROSEAU SHERIFF ESTIMATED WIND SPEEDS OF 70 MPH 2 
MILES SOUTH OF ROSEAU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4933 9482 4914 9477
      4888 9467 4878 9468 4873 9458 4870 9443
      4825 9442 4826 9625 4862 9618 4886 9661
      4901 9623 4901 9516 4939 9516
TIME...MOT...LOC 1312Z 235DEG 45KT 4895 9584 4877 9552
          4850 9559

$$

GROCHOCINSKI

997 
WWUS53 KFGF 201332
SVSFGF

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

MNC007-069-077-089-135-201400-
/O.CON.KFGF.SV.W.0099.000000T0000Z-110720T1400Z/
LAKE OF THE WOODS MN-KITTSON MN-ROSEAU MN-BELTRAMI MN-MARSHALL MN-
832 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
BELTRAMI AND LAKE OF THE WOODS COUNTIES IN NORTH CENTRAL MINNESOTA...
AND NORTHEASTERN MARSHALL...ROSEAU AND EAST CENTRAL KITTSON COUNTIES
IN NORTHWEST MINNESOTA UNTIL 900 AM CDT...

AT 830 AM CDT...LOCAL LAW ENFORCEMENT REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 70 MPH.  THE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 9 MILES NORTH OF SALOL TO 3 MILES SOUTH OF SWIFT TO 6 MILES
NORTH OF GATES CORNER...MOVING TO THE NORTHEAST AT 55 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ROOSEVELT AND OAKS CORNER AROUND 840 AM CDT.
  FAUNCE AND ARNESEN AROUND 845 AM CDT.
  WILLIAMS AND LONG POINT AROUND 850 AM CDT.
  GRACETON AND CARP AROUND 855 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS
INCLUDE BAUDETTE...PITT...PENASSE...OAK ISLAND...FLAG ISLAND AND
CLEMENTSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4933 9482 4914 9477
      4888 9467 4878 9468 4873 9458 4870 9443
      4835 9444 4836 9584 4862 9618 4886 9661
      4901 9623 4901 9516 4939 9516
TIME...MOT...LOC 1332Z 239DEG 49KT 4901 9552 4883 9520
          4856 9528

$$

GROCHOCINSKI

338 
WWUS53 KFGF 201349
SVSFGF

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

MNC007-069-089-201358-
/O.CAN.KFGF.SV.W.0099.000000T0000Z-110720T1400Z/
KITTSON MN-BELTRAMI MN-MARSHALL MN-
849 AM CDT WED JUL 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BELTRAMI COUNTY IN
NORTH CENTRAL MINNESOTA...AND NORTHEASTERN MARSHALL AND EAST CENTRAL
KITTSON COUNTIES IN NORTHWEST MINNESOTA IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA. THE WARNING CONTINUES FOR WESTERN KITTSON COUNTY FOR AN 
APPROACHING STORM.

LAT...LON 4936 9507 4938 9496 4933 9482 4914 9477
      4888 9467 4878 9468 4873 9458 4870 9443
      4854 9444 4854 9592 4901 9616 4901 9516
      4939 9516
TIME...MOT...LOC 1348Z 239DEG 49KT 4911 9521 4892 9490
          4866 9499

$$

MNC077-135-201400-
/O.CON.KFGF.SV.W.0099.000000T0000Z-110720T1400Z/
LAKE OF THE WOODS MN-ROSEAU MN-
849 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LAKE OF THE
WOODS COUNTY IN NORTH CENTRAL MINNESOTA...AND ROSEAU COUNTY IN
NORTHWEST MINNESOTA UNTIL 900 AM CDT...

AT 844 AM CDT...LOCAL LAW ENFORCEMENT REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 70 MPH.  THE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 12 MILES NORTH OF WARROAD TO 6 MILES SOUTH OF LONG POINT TO 5
MILES NORTHWEST OF FAUNCE...MOVING TO THE NORTHEAST AT 55 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GRACETON AROUND 855 AM CDT.
  BAUDETTE...PITT AND PENASSE AROUND 900 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS
INCLUDE OAK ISLAND...FLAG ISLAND...CLEMENTSON AND ANGLE INLET.

AT ABOUT 845 AM CDT...A WEATHER SPOTTER REPORTED DIME HAIL AND WINDS 
UP TO 65 MPH 2 MILES NORTH OF ROSEAU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4936 9507 4938 9496 4933 9482 4914 9477
      4888 9467 4878 9468 4873 9458 4870 9443
      4854 9444 4854 9592 4901 9616 4901 9516
      4939 9516
TIME...MOT...LOC 1348Z 239DEG 49KT 4911 9521 4892 9490
          4866 9499

$$

GROCHOCINSKI/KAISER

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, 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, 8:58 AM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods, Roseau	47 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.