Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 5, NWS Grand Forks, ND

May 10, 2011Clay County, Minnesota; Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 10, 2011, 2:43 AM CDT for Clay County, Minnesota; Cass County, North Dakota. It was in force for 62 min. 1 report 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: May 10, 2011, 2:43 AM CDT (07:43 UTC)
Expired: May 10, 2011, 3:45 AM CDT
In force: 62 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, MN, Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 75 km from the middle of the area, began a volume at 07:43 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
May 10, 3:15 AM CDT	HAIL 1.75	West Fargo, ND	BROKE WINDOWS OF CAR

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

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 7.7 hours before the alert went out and 248 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: 706 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 81 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.

948 
WUUS53 KFGF 100743
SVRFGF
MNC027-NDC017-100845-
/O.NEW.KFGF.SV.W.0005.110510T0743Z-110510T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
243 AM CDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL CLAY COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 345 AM CDT

* AT 239 AM 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 3 MILES
  NORTH OF LEONARD...OR 24 MILES SOUTHWEST OF FARGO...MOVING TO THE
  NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DAVENPORT AROUND 255 AM CDT.
  DURBIN AROUND 300 AM CDT.
  HORACE AROUND 310 AM CDT.
  MAPLETON AND WILD RICE AROUND 320 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE WEST FARGO...PROSPER...FARGO...DILWORTH AND GLYNDON.

FOR MOTORISTS ON INTERSTATE 29...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 61 AROUND 325 AM CDT...AND MILE MARKER 83
AROUND 345 AM CDT...

FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 331 AROUND 305 AM CDT...AND MILE MARKER 352
AROUND 330 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4716 9692 4685 9643 4664 9717 4666 9745
TIME...MOT...LOC 0743Z 221DEG 22KT 4671 9722
WIND...HAIL 60MPH 1.00IN

$$

EWENS

2 follow-up statements

524 
WWUS53 KFGF 100804
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
304 AM CDT TUE MAY 10 2011

MNC027-NDC017-100845-
/O.CON.KFGF.SV.W.0005.000000T0000Z-110510T0845Z/
CLAY MN-CASS ND-
304 AM CDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
CLAY COUNTY IN NORTHWEST MINNESOTA...AND SOUTHEASTERN CASS COUNTY IN
SOUTHEAST NORTH DAKOTA UNTIL 345 AM CDT...

AT 302 AM 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 4 MILES
EAST OF DURBIN...OR 13 MILES WEST OF FARGO...MOVING TO THE NORTHEAST
AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MAPLETON AROUND 310 AM CDT.
  WILD RICE AND FRONTIER AROUND 315 AM CDT.
  WEST FARGO...PROSPER AND PRAIRIE ROSE AROUND 320 AM CDT.
  FARGO...REILE'S ACRES AND OXBOW AROUND 325 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE BRIARWOOD...MOORHEAD...HARWOOD...DILWORTH...NORTH RIVER AND
ARGUSVILLE.

FOR MOTORISTS ON INTERSTATE 29...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 60 AROUND 315 AM CDT...AND MILE MARKER 82
AROUND 340 AM CDT...

FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 337 AROUND 305 AM CDT...AND MILE MARKER 345
AROUND 315 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4716 9692 4685 9643 4664 9717 4666 9745
TIME...MOT...LOC 0804Z 225DEG 25KT 4683 9706

$$

EWENS

414 
WWUS53 KFGF 100843
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
343 AM CDT TUE MAY 10 2011

MNC027-NDC017-100853-
/O.EXP.KFGF.SV.W.0005.000000T0000Z-110510T0845Z/
CLAY MN-CASS ND-
343 AM CDT TUE MAY 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL CLAY COUNTY IN
NORTHWEST MINNESOTA...AND SOUTHEASTERN CASS COUNTY IN SOUTHEAST NORTH
DAKOTA WILL EXPIRE AT 345 AM CDT...

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

LAT...LON 4716 9692 4685 9643 4664 9717 4666 9745
TIME...MOT...LOC 0843Z 230DEG 28KT 4703 9669

$$

EWENS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 3:30 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Norman	60 min
May 10, 4:29 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Mahnomen, Norman, Polk	61 min
May 10, 5:27 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Hubbard	63 min
May 10, 6:29 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami	46 min
May 10, 6:37 AM CDT	Severe Thunderstorm Warning	FGF	Clearwater, Polk	53 min
May 10, 12:01 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	44 min
May 10, 12:44 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	61 min
May 10, 2:25 AM CDT	Severe Thunderstorm Warning	FGF	Cass	48 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Severe Thunderstorm Warnings in North Dakota, 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.