Alert archive / North Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 100, NWS Grand Forks, ND

July 20, 20115 counties in North Dakota; Kittson County, Marshall County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 2011, 8:08 AM CDT for 5 counties in North Dakota; Kittson County, Marshall County, Minnesota. It was in force for 67 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 20, 2011, 8:08 AM CDT (13:08 UTC)
Expired: Jul 20, 2011, 9:15 AM CDT
In force: 67 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Kittson County, MN, Marshall County, MN, Cavalier County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 132 km from the middle of the area, began a volume at 13:12 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, 8:35 AM CDT	TSTM WND GST 60	3 S Concrete, ND

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 27 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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

Bismarck Municip, ND (KBIS), launched 12:00Z, 1.1 hours before the alert went out and 314 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: 3591 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 15.4

Open this sounding in Storm Lab

The text

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

763 
WUUS53 KFGF 201308
SVRFGF
MNC069-089-NDC019-063-067-071-099-201415-
/O.NEW.KFGF.SV.W.0100.110720T1308Z-110720T1415Z/

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN KITTSON COUNTY IN NORTHWEST MINNESOTA...
  NORTHWESTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA...
  EASTERN CAVALIER COUNTY IN NORTHEAST NORTH DAKOTA...
  NORTHEASTERN NELSON COUNTY IN NORTHEAST NORTH DAKOTA...
  PEMBINA COUNTY IN NORTHEAST NORTH DAKOTA...
  EXTREME NORTHEASTERN RAMSEY COUNTY IN NORTHEAST NORTH DAKOTA...
  WALSH COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 915 AM CDT

* AT 802 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 3 MILES EAST OF HANNAH TO 3
  MILES EAST OF NEKOMA TO 2 MILES EAST OF BROCKET...MOVING TO THE
  EAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  OSNABROCK...MILTON AND MAIDA AROUND 815 AM CDT.
  UNION...VANG AND OLGA AROUND 825 AM CDT.
  MOUNTAIN AND FORDVILLE AROUND 830 AM CDT.
  WALHALLA...PARK RIVER AND PISEK AROUND 835 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORMS
INCLUDE ADAMS...LANKIN...CONWAY...LEROY...CAVALIER AND GRAFTON.

FOR MOTORISTS ON INTERSTATE 29...SEVERE THUNDERSTORMS WILL BE
BETWEEN...MILE MARKERS 168 AND 216...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4901 9707 4883 9693 4835 9694 4810 9835
      4858 9836 4900 9870
TIME...MOT...LOC 1308Z 255DEG 45KT 4900 9852 4861 9821
          4822 9820
WIND...HAIL 70MPH 1.00IN

$$

TG

3 follow-up statements

448 
WWUS53 KFGF 201349 RRA
SVSFGF

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

NDC063-071-201357-
/O.CAN.KFGF.SV.W.0100.000000T0000Z-110720T1415Z/
NELSON ND-RAMSEY ND-
849 AM CDT WED JUL 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHEASTERN RAMSEY
AND NORTHEASTERN NELSON COUNTIES IN NORTHEAST NORTH DAKOTA IS
CANCELLED...

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

LAT...LON 4820 9784 4862 9804 4900 9841 4901 9707
      4883 9693 4835 9694
TIME...MOT...LOC 1347Z 259DEG 50KT 4908 9783 4869 9752
          4830 9752

$$

MNC069-089-NDC019-067-099-201415-
/O.CON.KFGF.SV.W.0100.000000T0000Z-110720T1415Z/
KITTSON MN-CAVALIER ND-PEMBINA ND-MARSHALL MN-WALSH ND-
849 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
MARSHALL AND WESTERN KITTSON COUNTIES IN NORTHWEST MINNESOTA...AND
EASTERN WALSH...PEMBINA AND EASTERN CAVALIER COUNTIES IN NORTHEAST
NORTH DAKOTA UNTIL 915 AM CDT...

AT 844 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 10 MILES NORTH OF WALHALLA TO 4
MILES EAST OF HENSEL TO 3 MILES SOUTHWEST OF VESELEYVILLE...MOVING TO
THE EAST AT 50 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GRAFTON...MINTO AND NECHE AROUND 855 AM CDT.
  OAKWOOD AND HERRICK AROUND 900 AM CDT.
  DRAYTON...ROBBIN AND JOLIETTE AROUND 905 AM CDT.
  PEMBINA...ST. VINCENT AND NOYES AROUND 910 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS
INCLUDE HAMILTON...BATHGATE...BOWESMONT...MATTSON...HUMBOLDT AND
HALLOCK.

FOR MOTORISTS ON INTERSTATE 29...SEVERE THUNDERSTORMS WILL BE
BETWEEN...MILE MARKERS 168 AND 216...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4820 9784 4862 9804 4900 9841 4901 9707
      4883 9693 4835 9694
TIME...MOT...LOC 1347Z 259DEG 50KT 4908 9783 4869 9752
          4830 9752

$$

ROGERS

947 
WWUS53 KFGF 201406
SVSFGF

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

NDC019-201415-
/O.CAN.KFGF.SV.W.0100.000000T0000Z-110720T1415Z/
CAVALIER ND-
906 AM CDT WED JUL 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CAVALIER COUNTY IN
NORTHEAST NORTH DAKOTA IS CANCELLED...

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

LAT...LON 4835 9695 4835 9696 4851 9763 4866 9760
      4900 9774 4901 9707 4883 9693
TIME...MOT...LOC 1405Z 259DEG 50KT 4912 9745 4873 9715
          4834 9715

$$

MNC069-089-NDC067-099-201415-
/O.CON.KFGF.SV.W.0100.000000T0000Z-110720T1415Z/
KITTSON MN-PEMBINA ND-MARSHALL MN-WALSH ND-
906 AM CDT WED JUL 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
MARSHALL AND WESTERN KITTSON COUNTIES IN NORTHWEST MINNESOTA...AND
NORTHEASTERN WALSH AND EASTERN PEMBINA COUNTIES IN NORTHEAST NORTH
DAKOTA UNTIL 915 AM CDT...

AT 902 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 NORTH OF NECHE TO 3 MILES NORTHWEST OF BOWESMONT TO 3
MILES NORTHEAST OF WARSAW...MOVING TO THE EAST AT 55 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  PEMBINA...ST. VINCENT AND NOYES AROUND 910 AM CDT.
  HALLOCK...NORTHCOTE AND HUMBOLDT AROUND 915 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS
INCLUDE MATTSON.

FOR MOTORISTS ON INTERSTATE 29...SEVERE THUNDERSTORMS WILL BE
BETWEEN...MILE MARKERS 207 AND 216...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4835 9695 4835 9696 4851 9763 4866 9760
      4900 9774 4901 9707 4883 9693
TIME...MOT...LOC 1405Z 259DEG 50KT 4912 9745 4873 9715
          4834 9715

$$

ROGERS

146 
WWUS53 KFGF 201413
SVSFGF

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

MNC069-089-NDC067-099-201423-
/O.EXP.KFGF.SV.W.0100.000000T0000Z-110720T1415Z/
KITTSON MN-PEMBINA ND-MARSHALL MN-WALSH ND-
913 AM CDT WED JUL 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MARSHALL AND
WESTERN KITTSON COUNTIES IN NORTHWEST MINNESOTA...AND NORTHEASTERN
WALSH AND EASTERN PEMBINA COUNTIES IN NORTHEAST NORTH DAKOTA WILL
EXPIRE AT 915 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THESE
THUNDERSTORMS.

LAT...LON 4835 9695 4835 9696 4851 9763 4866 9760
      4900 9774 4901 9707 4883 9693
TIME...MOT...LOC 1413Z 259DEG 50KT 4898 9715 4877 9693
          4857 9694

$$

ROGERS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 4:30 AM CDT, 3 hours 38 minutes earlier.

Area forecast discussion, Jul 20, 4:30 AM CDT, 3 hours 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
430 AM CDT WED JUL 20 2011

.SHORT TERM...TODAY THROUGH FRIDAY NIGHT.
ECMWF WAS A TAD FASTER THAN THE NAM AND GFS. GFS WAS THE SLOWEST BUT
NOT BY MUCH THROUGH 84 HOURS. WILL USE A COMBINATION OF THE ECMWF
AND GFS. WATER VAPOR LOOP SHOWING A SHORT WAVE OVER NORTH CENTRAL ND
AND ANOTHER OVER THE NEB PANHANDLE. SHORT WAVES WILL ROTATE ACROSS
THE NORTHERN PLAINS TODAY. MAIN UPPER TROUGH OVER WESTERN MT WILL
MOVE THROUGH SOUTHERN CANADA TODAY AND WILL SEND A COLD FRONT ACROSS
THE AREA THIS AFTERNOON AND EVENING.

INSTABILITY REMAINS FAIRLY HIGH ACROSS THE AREA AND THUNDERSTORMS
WERE DEVELOPING. MODELS SOUNDINGS INDICATED A RELATIVELY CAPPED
ENVIRONMENT BUT LOW LEVEL JET AND SHORT WAVE APPARENTLY ENOUGH TO
OVERCOME.
NEXT SIGNIFICANT UPPER LEVEL TROUGH TO MOVE THROUGH SAT. WILL UP
POPS FRI NIGHT INTO SAT.

.LONG TERM...SATURDAY AND SUNDAY.
GFS CONTINUES TO BE A PROGRESSIVELY SLOWER SOLUTION THAN THE ECMWF
THIS PERIOD. WILL BLEND THE TWO.

&&

.AVIATION...
VFR CONDITIONS WERE OVER THE FORECAST AREA. CIGS WERE MOSTLY ABOVE 9
THOUSAND FT OVER NORTHWEST HALF OF AREA...CLEAR IN THE SOUTHEAST
HALF. SOME IFR RESTRICTIONS TO VISIBILITY WAS OVER FAR NORTHWEST
ZONES WITH VISIBILITIES UNDER 3 MILES. ALSO THUNDERSTORMS DEVELOPING
OVER NORTHEAST ND AD SOUTH CENTRAL ND AND WERE MOVING TO THE
NORTHEAST. COLD FRONT TO MOVE IN FROM THE WEST THIS AFTERNOON AND
EVENING. BREEZY CONDITIONS EXPECTED POST FRONTAL.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...EXCESSIVE HEAT WARNING UNTIL 1 AM CDT THURSDAY FOR NDZ024-
     026>030-038-039-049-052-053.

     HEAT ADVISORY UNTIL 1 AM CDT THURSDAY FOR NDZ006>008-014>016-054.

MN...EXCESSIVE HEAT WARNING UNTIL 1 AM CDT THURSDAY FOR MNZ001>003-
     014-015-022>024-027>032-040.

     HEAT ADVISORY UNTIL 1 AM CDT THURSDAY FOR MNZ004>009-013-016-017.

&&

HOPPES

Hazardous weather outlook, Jul 20, 7:00 AM CDT, 1 hour 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND FORKS ND
700 AM CDT WED JUL 20 2011

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-211200-
WEST POLK-NORMAN-CLAY-KITTSON-ROSEAU-LAKE OF THE WOODS-
WEST MARSHALL-EAST MARSHALL-NORTH BELTRAMI-PENNINGTON-RED LAKE-
EAST POLK-NORTH CLEARWATER-SOUTH BELTRAMI-MAHNOMEN-
SOUTH CLEARWATER-HUBBARD-WEST BECKER-EAST BECKER-WILKIN-
WEST OTTER TAIL-EAST OTTER TAIL-WADENA-GRANT-TOWNER-CAVALIER-
PEMBINA-BENSON-RAMSEY-EASTERN WALSH-EDDY-NELSON-GRAND FORKS-
GRIGGS-STEELE-TRAILL-BARNES-CASS-RANSOM-SARGENT-RICHLAND-
WESTERN WALSH-
700 AM CDT WED JUL 20 2011

...SOME SEVERE THUNDERSTORMS ARE EXPECTED WEDNESDAY MORNING...
...STORMS MAY REDEVELOP AGAIN THIS AFTERNOON AND EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NORTH
DAKOTA...WEST CENTRAL AND NORTHWEST MINNESOTA.

.DAY ONE...TODAY AND THIS EVENING

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1 PM CDT FOR
MAINLY NORTHEAST NORTH DAKOTA AND PARTS OF NORTHWEST MINNESOTA.
THE STORMS WILL PRODUCE DAMAGING WINDS...SOME LARGE HAIL AND
LOCALLY HEAVY RAINFALL. A TORNADO MAY BE POSSIBLE.

A SLIGHT RISK OF SEVERE THUNDERSTORMS WILL BE POSSIBLE LATER THIS
AFTERNOON AND EVENING ROUGHLY EAST OF A LINE FROM ASHBY MINNESOTA
TO NECHE NORTH DAKOTA. THE STORMS WILL BE MOSTLY LIKELY AFTER 1 PM
AND SHOULD MOVE OUT OF THE AREA BY 7 OR 8 PM WEDNESDAY. THE STORMS
WILL PRODUCE SOME LARGE HAIL...DAMAGING WINDS AND LOCALLY HEAVY
RAIN. A TORNADO WILL ALSO BE POSSIBLE.

A COLD FRONT WILL MOVE IN FROM THE WEST THIS AFTERNOON AND PRODUCE
THE STRONG THUNDERSTORMS. COOLER AND LESS HUMID WEATHER WILL MOVE
INTO THE REGION ON THURSDAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A SLIGHT RISK OF SEVERE THUNDERSTORMS WILL BE POSSIBLE LATE FRIDAY
AFTERNOON AND FRIDAY NIGHT. THE STORMS CAN BE EXPECTED WEST OF A
LINE FROM BADOURA MINNESOTA TO MAPLE BAY TO LANCASTER MINNESOTA.
THE STORMS WILL PRODUCE SOME LARGE HAIL...DAMAGING WINDS AND
LOCALLY HEAVY RAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

HOPPES

In the hours before

Special weather statement, Jul 20, 3:36 AM CDT, 4 hours 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
336 AM CDT WED JUL 20 2011

NDZ006-007-014-015-200900-
BENSON ND-CAVALIER ND-RAMSEY ND-TOWNER ND-
336 AM CDT WED JUL 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN TOWNER...NORTHWESTERN
RAMSEY...SOUTHWESTERN CAVALIER AND NORTHERN BENSON COUNTIES UNTIL 400
AM CDT...

AT 335 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 10 MILES EAST OF LEEDS...OR 21 MILES NORTHWEST OF DEVILS
LAKE...MOVING TO THE NORTHEAST AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THE STORM.

THE STORM WILL BE NEAR...
CANDO AND CONSIDINE AROUND 350 AM CDT.
STARKWEATHER...NEWVILLE AND GARSKE AROUND 400 AM CDT.

BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME
SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE.

TG

Special weather statement, Jul 20, 4:02 AM CDT, 4 hours 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
402 AM CDT WED JUL 20 2011

NDZ006-007-014-015-200930-
BENSON ND-CAVALIER ND-RAMSEY ND-TOWNER ND-
402 AM CDT WED JUL 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN TOWNER...
NORTHWESTERN RAMSEY...SOUTHWESTERN CAVALIER AND NORTHERN BENSON
COUNTIES UNTIL 430 AM CDT...

AT 358 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM NEAR LEEDS...OR 25 MILES NORTHWEST OF DEVILS LAKE...
MOVING TO THE NORTHEAST AT 30 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THE STORM.

THE STORM WILL BE NEAR...
CHURCHS FERRY AROUND 410 AM CDT.
MAZA AROUND 420 AM CDT.
CANDO AROUND 425 AM CDT.
STARKWEATHER...NEWVILLE AND GARSKE AROUND 430 AM CDT.

BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME
SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE.

TG

Special weather statement, Jul 20, 4:04 AM CDT, 4 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
404 AM CDT WED JUL 20 2011

NDZ008-016-026-054-200930-
EASTERN WALSH COUNTY ND-NELSON ND-PEMBINA ND-WESTERN WALSH COUNTY ND-
404 AM CDT WED JUL 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN WALSH...SOUTHWESTERN
PEMBINA AND EXTREME NORTHEASTERN NELSON COUNTIES UNTIL 430 AM CDT...

AT 402 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 14 MILES SOUTHWEST OF PARK RIVER...OR 29 MILES WEST OF
GRAFTON...MOVING TO THE NORTHEAST AT 30 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THE STORM.

THE STORM WILL BE NEAR...
LANKIN AROUND 410 AM CDT.
PARK RIVER AROUND 425 AM CDT.
HOOPLE AND EDINBURG AROUND 430 AM CDT.

BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME
SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE.

TG

Local storm report, Jul 20, 6:07 AM CDT, 2 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
607 AM CDT WED JUL 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0500 AM     HAIL             4 SE STARKWEATHER       48.41N 98.82W
07/20/2011  M1.00 INCH       RAMSEY             ND   CO-OP OBSERVER

            1.51 INCHES OF RAIN

&&

MEWENS

Local storm report, Jul 20, 7:40 AM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
740 AM CDT WED JUL 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0738 AM     TSTM WND GST     KARLSTAD                48.58N 96.52W
07/20/2011  E60 MPH          KITTSON            MN   AMATEUR RADIO

&&

MEWENS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 9:16 PM CDT	River Flood Warning	FGF	Cass, Richland	9 days
Jul 20, 4:08 AM CDT	Severe Thunderstorm Warning	FGF	Walsh	67 min
Jul 20, 4:11 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	64 min
Jul 20, 5:00 AM CDT	Tornado Warning	FGF	Ramsey	45 min
Jul 20, 5:30 AM CDT	Tornado Warning	FGF	Ramsey, Walsh	45 min
Jul 20, 5:41 AM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	34 min
Jul 20, 5:53 AM CDT	Areal Flood Advisory	FGF	Benson, Cavalier, Ramsey, Towner, Walsh	9 hr
Jul 20, 6:07 AM CDT	Tornado Warning	FGF	Grand Forks, Nelson, Walsh	38 min
Jul 20, 6:28 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Ramsey, Towner	62 min
Jul 20, 6:40 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	50 min
Jul 20, 7:21 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey, Towner, Walsh	54 min
Jul 20, 8:59 AM CDT	Areal Flood Advisory	FGF	Cavalier, Pembina, Walsh	6 hr
Jul 20, 10:49 AM CDT	River Flood Watch	FGF	Grand Forks	47 hr
Jul 20, 10:49 AM CDT	River Flood Watch	FGF	Grand Forks, Walsh	47 hr
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, 8:27 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, 9:16 AM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods, Roseau	44 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2011 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.