Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 87, NWS Grand Forks, ND

July 19, 2011Clay County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 19, 2011, 4:47 AM CDT for Clay County, Minnesota. It was in force for 58 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: Jul 19, 2011, 4:47 AM CDT (09:47 UTC)
Expired: Jul 19, 2011, 5:45 AM CDT
In force: 58 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Clay County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 91 km from the middle of the area, began a volume at 09:49 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 19, 4:47 AM CDT	TSTM WND GST 63	Dilworth, MN

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, 9.8 hours before the alert went out and 251 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: 6467 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 10.1
Supercell composite: 42.1

Open this sounding in Storm Lab

The text

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

338 
WUUS53 KFGF 190947
SVRFGF
MNC027-191045-
/O.NEW.KFGF.SV.W.0087.110719T0947Z-110719T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
447 AM CDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLAY COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 545 AM CDT

* AT 445 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
  SOUTH OF DILWORTH...OR 7 MILES SOUTHEAST OF FARGO...MOVING TO THE
  EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SABIN AROUND 455 AM CDT.
  GLYNDON AND AVERILL AROUND 500 AM CDT.
  BAKER AROUND 515 AM CDT.
  DOWNER AROUND 525 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE MUSKODA AND BARNESVILLE.

FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 2 AROUND 445 AM CDT...AND MILE MARKER 15 AROUND
520 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT LIGHTNING IS
OCCURRING WITH THE STORM. MOVE INDOORS IMMEDIATELY. LIGHTNING IS ONE
OF NATURES LEADING KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THE STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4664 9678 4676 9679 4677 9677 4677 9679
      4683 9680 4685 9677 4693 9676 4692 9678
      4697 9681 4704 9682 4699 9622 4663 9629
TIME...MOT...LOC 0947Z 284DEG 13KT 4683 9668
WIND...HAIL 60MPH 1.00IN

$$

JK

2 follow-up statements

551 
WWUS53 KFGF 191004
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
504 AM CDT TUE JUL 19 2011

MNC027-191045-
/O.CON.KFGF.SV.W.0087.000000T0000Z-110719T1045Z/
CLAY MN-
504 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLAY COUNTY IN
NORTHWEST MINNESOTA UNTIL 545 AM CDT...

AT 458 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
EAST OF SABIN...OR 12 MILES SOUTHEAST OF FARGO...MOVING TO THE EAST
AT 30 MPH.

A WIND GUST OF 63 MPH WAS REPORTED AT DILWORTH WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DOWNER AROUND 510 AM CDT.
  MUSKODA AROUND 515 AM CDT.
  BARNESVILLE AND HAWLEY AROUND 520 AM CDT.
  HITTERDAL AROUND 525 AM CDT.

FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 10 AROUND 505 AM CDT...AND MILE MARKER 17
AROUND 510 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4664 9678 4675 9679 4677 9677 4677 9679
      4682 9680 4685 9677 4692 9676 4693 9678
      4697 9679 4697 9681 4704 9682 4699 9622
      4663 9629
TIME...MOT...LOC 1004Z 282DEG 25KT 4678 9654

$$

JK

120 
WWUS53 KFGF 191020
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
520 AM CDT TUE JUL 19 2011

MNC027-191045-
/O.CON.KFGF.SV.W.0087.000000T0000Z-110719T1045Z/
CLAY MN-
520 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN CLAY
COUNTY IN NORTHWEST MINNESOTA UNTIL 545 AM CDT...

AT 517 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 2 MILES
SOUTHEAST OF SABIN...OR 13 MILES SOUTHEAST OF FARGO...MOVING TO THE
EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DOWNER AROUND 530 AM CDT.
  BARNESVILLE AND MUSKODA AROUND 535 AM CDT.
  HITTERDAL AND HAWLEY AROUND 545 AM CDT.

FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKER 11 AROUND 520 AM CDT...AND MILE MARKER 18
AROUND 530 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4664 9675 4702 9658 4702 9653 4699 9622
      4663 9629
TIME...MOT...LOC 1021Z 272DEG 24KT 4676 9657

$$

JK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 5:14 AM CDT	Flash Flood Warning	FGF	Clay	5 hr
Jul 19, 5:15 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Otter Tail, Wilkin	60 min
Jul 19, 5:45 AM CDT	Flash Flood Warning	FGF	Clay	5 hr
Jul 19, 6:00 AM CDT	Flash Flood Warning	FGF	Becker, Otter Tail	4 hr
Jul 19, 6:00 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Otter Tail	60 min
Jul 19, 6:44 AM CDT	Flash Flood Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	4 hr
Jul 19, 6:50 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	55 min
Jul 19, 10:00 AM CDT	River Flood Warning	FGF	Clay	25 hr
Jul 19, 10:00 AM CDT	River Flood Warning	FGF	Clay	49 hr
Jul 19, 2:15 PM CDT	Areal Flood Advisory	FGF	Beltrami, Clearwater	10 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.