Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Grand Forks, ND

July 4, 2011Norman County, Polk County, Minnesota; Traill County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 4, 2011, 8:17 PM CDT for Norman County, Polk County, Minnesota; Traill County, North Dakota. It was in force for 58 min. 3 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 4, 2011, 8:17 PM CDT (01:17 UTC)
Expired: Jul 4, 2011, 9:15 PM CDT
In force: 58 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Norman County, MN, Polk County, MN, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 59 km from the middle of the area, began a volume at 01:19 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 4, 8:19 PM CDT	HAIL 1	Nielsville, MN
Jul 4, 8:51 PM CDT	HAIL 1.25	4 Ene Shelly, MN	SEVERAL QUARTER TO HALF DOLLAR SIZE HAIL.
Jul 4, 8:55 PM CDT	HAIL 1.5	3 Ne Shelly, MN

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 4, 3:06 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 7:14 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 1.3 hours before the alert went out and 271 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: 1540 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1783 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

733 
WUUS53 KFGF 050117
SVRFGF
MNC107-119-NDC097-050215-
/O.NEW.KFGF.SV.W.0049.110705T0117Z-110705T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
817 PM CDT MON JUL 4 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN NORMAN COUNTY IN NORTHWEST MINNESOTA...
  SOUTH CENTRAL POLK COUNTY IN NORTHWEST MINNESOTA...
  EAST CENTRAL TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 915 PM CDT

* AT 814 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 3 MILES EAST OF NIELSVILLE...OR 31 MILES SOUTHEAST OF GRAND
  FORKS...MOVING TO THE SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOCKHART AND BELTRAMI AROUND 840 PM CDT.
  HADLER AROUND 850 PM CDT.
  ADA AROUND 855 PM CDT.
  FLAMING AROUND 910 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4746 9624 4720 9640 4748 9706 4768 9678
TIME...MOT...LOC 0117Z 293DEG 21KT 4752 9673
WIND...HAIL 60MPH 1.50IN

$$

TG

1 follow-up statement

351 
WWUS53 KFGF 050205
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
905 PM CDT MON JUL 4 2011

NDC097-050213-
/O.CAN.KFGF.SV.W.0049.000000T0000Z-110705T0215Z/
TRAILL ND-
905 PM CDT MON JUL 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL TRAILL COUNTY IN
SOUTHEAST NORTH DAKOTA IS CANCELLED...

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

LAT...LON 4720 9640 4737 9682 4741 9686 4746 9686
      4762 9664 4746 9624
TIME...MOT...LOC 0203Z 308DEG 15KT 4744 9654

$$

MNC107-119-050215-
/O.CON.KFGF.SV.W.0049.000000T0000Z-110705T0215Z/
NORMAN MN-POLK MN-
905 PM CDT MON JUL 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
POLK AND WESTERN NORMAN COUNTIES IN NORTHWEST MINNESOTA UNTIL 915 PM
CDT...

AT 902 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
LOCKHART...OR 40 MILES SOUTHEAST OF GRAND FORKS...MOVING TO THE
SOUTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ADA...FLAMING AND HADLER AROUND 915 PM CDT.

A TORNADO WARNING WAS ALSO IN EFFECT FOR WESTERN NORMAN AND SOUTH 
CENTRAL POLK COUNTIES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DURING THUNDERSTORMS YOU SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT
STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES.

&&

LAT...LON 4720 9640 4737 9682 4741 9686 4746 9686
      4762 9664 4746 9624
TIME...MOT...LOC 0203Z 308DEG 15KT 4744 9654

$$

HOPPES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:19 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Pennington, Polk, Red Lake	56 min
Jul 4, 7:43 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Lake of the Woods	48 min
Jul 4, 7:55 PM CDT	Tornado Warning	FGF	Polk, Red Lake	50 min
Jul 4, 8:50 PM CDT	Tornado Warning	FGF	Norman, Polk	40 min
Jul 4, 9:12 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	63 min
Jul 4, 9:21 PM CDT	Tornado Warning	FGF	Clay	39 min
Jul 4, 9:40 PM CDT	Severe Thunderstorm Warning	FGF	Clay	65 min
Jul 4, 10:29 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Otter Tail, Wilkin	61 min
Jul 4, 11:31 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	59 min
Jul 5, 12:40 AM CDT	Severe Thunderstorm Warning	FGF	Grant	26 min
Jul 5, 3:12 AM CDT	Areal Flood Advisory	FGF	Grant, Otter Tail, Wilkin	9 hr
Jul 5, 4:06 AM CDT	Areal Flood Advisory	FGF	Wilkin	8 hr
Jul 5, 4:24 AM CDT	Severe Thunderstorm Warning	FGF	Wilkin	22 min
Jul 4, 9:51 PM CDT	Tornado Warning	FGF	Cass	39 min
Jul 4, 10:26 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland, Sargent	64 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.