Alert archive / North Dakota / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 96, NWS Grand Forks, ND

August 29, 20134 counties in North Dakota; Marshall County, Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 29, 2013, 6:46 AM CDT for 4 counties in North Dakota; Marshall County, Polk County, Minnesota. It was in force for 59 min. 4 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: Aug 29, 2013, 6:46 AM CDT (11:46 UTC)
Expired: Aug 29, 2013, 7:45 AM CDT
In force: 59 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Marshall County, MN, Polk County, MN, Grand Forks County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 47 km from the middle of the area, began a volume at 11:47 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
Aug 29, 7:05 AM CDT	TSTM WND DMG	1 E Forest River, ND	A FEW LARGE TREE BRANCHES DOWN IN FARM SHELTER BELT.
Aug 29, 7:15 AM CDT	TSTM WND DMG	3 N Manvel, ND	A FEW LARGE TREE BRANCHES BROKEN DOWN IN A SHELTER BELT.
Aug 29, 7:15 AM CDT	TSTM WND DMG	5 E Ardoch, ND	A COUPLE OF LARGE COTTONWOOD TREES SNAPPED IN SHELTER BELT.
Aug 29, 7:25 AM CDT	TSTM WND DMG	3 Ne Oslo, MN	SEVERAL LARGE TREE 3 TO 5 INCH DIAMETER TREE BRANCHES BROKEN DOWN IN FARMYARD.

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 4 storm reports to this severe thunderstorm warning; the first came 19 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
Aug 29, 6:12 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 11.8 hours before the alert went out and 285 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: 142 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 2203 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

414 
WUUS53 KFGF 291146
SVRFGF
MNC089-119-NDC035-091-097-099-291245-
/O.NEW.KFGF.SV.W.0096.130829T1146Z-130829T1245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
646 AM CDT THU AUG 29 2013

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA...
  NORTHWESTERN POLK COUNTY IN NORTHWEST MINNESOTA...
  GRAND FORKS COUNTY IN NORTHEAST NORTH DAKOTA...
  NORTHERN STEELE COUNTY IN SOUTHEAST NORTH DAKOTA...
  NORTHERN TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA...
  SOUTHEASTERN WALSH COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 745 AM CDT

* AT 642 AM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 20 MILES NORTHWEST OF LARIMORE TO LARIMORE TO
  FINLEY...AND MOVING EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LARIMORE AND SHERBROOKE AROUND 650 AM CDT.
  SHERBROOKE AND FORDVILLE AROUND 655 AM CDT.
  NORTHWOOD AND ORR AROUND 700 AM CDT.
  CONWAY AND ARVILLA AROUND 705 AM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE HATTON...HATTON...GRAND FORKS
AFB...PORTLAND...MINTO AND ARDOCH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4837 9702 4791 9686 4744 9700 4744 9791
      4789 9769 4822 9792
TIME...MOT...LOC 1145Z 270DEG 26KT 4812 9789 4786 9766
          4752 9780

HAIL...<.75IN
WIND...60MPH

$$

VG

3 follow-up statements

138 
WWUS53 KFGF 291204
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
704 AM CDT THU AUG 29 2013

MNC089-119-NDC035-091-097-099-291245-
/O.CON.KFGF.SV.W.0096.000000T0000Z-130829T1245Z/
GRAND FORKS ND-STEELE ND-TRAILL ND-POLK MN-MARSHALL MN-WALSH ND-
704 AM CDT THU AUG 29 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WALSH...SOUTHWESTERN MARSHALL...NORTHWESTERN POLK...NORTHERN
TRAILL...NORTHEASTERN STEELE AND GRAND FORKS COUNTIES UNTIL 745 AM
CDT...

AT 701 AM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM FOREST RIVER TO 6 MILES WEST OF GRAND FORKS TO
PORTLAND...AND MOVING EAST AT 40 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PORTLAND AND MAYVILLE AROUND 710 AM CDT.
  GRAND FORKS AND THOMPSON AROUND 715 AM CDT.
  EAST GRAND FORKS AROUND 720 AM CDT.
  OSLO AND REYNOLDS AROUND 725 AM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE OSLO...MALLORY AND ALVARADO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4787 9758 4824 9781 4837 9702 4791 9686
      4744 9700 4744 9783
TIME...MOT...LOC 1203Z 270DEG 26KT 4823 9739 4789 9718
          4749 9743

HAIL...<.75IN
WIND...60MPH

$$

VG

811 
WWUS53 KFGF 291214
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
714 AM CDT THU AUG 29 2013

MNC089-119-NDC035-091-097-099-291245-
/O.CON.KFGF.SV.W.0096.000000T0000Z-130829T1245Z/
GRAND FORKS ND-STEELE ND-TRAILL ND-POLK MN-MARSHALL MN-WALSH ND-
714 AM CDT THU AUG 29 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WALSH...SOUTHWESTERN MARSHALL...NORTHWESTERN POLK...NORTHERN
TRAILL...NORTHEASTERN STEELE AND GRAND FORKS COUNTIES UNTIL 745 AM
CDT...

AT 710 AM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM BIG WOODS TO MALLORY TO 6 MILES EAST OF MAYVILLE...AND
MOVING EAST AT 40 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ALVARADO AND CUMMINGS AROUND 720 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4787 9758 4824 9781 4837 9702 4791 9686
      4744 9700 4744 9783
TIME...MOT...LOC 1214Z 270DEG 26KT 4827 9709 4790 9688
          4748 9717

HAIL...<.75IN
WIND...60MPH

$$

VG

420 
WWUS53 KFGF 291228
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
728 AM CDT THU AUG 29 2013

MNC089-119-NDC035-091-097-099-291238-
/O.CAN.KFGF.SV.W.0096.000000T0000Z-130829T1245Z/
GRAND FORKS ND-STEELE ND-TRAILL ND-POLK MN-MARSHALL MN-WALSH ND-
728 AM CDT THU AUG 29 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WALSH...
SOUTHWESTERN MARSHALL...NORTHWESTERN POLK...NORTHERN TRAILL...
NORTHEASTERN STEELE AND GRAND FORKS COUNTIES IS CANCELLED...

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

LAT...LON 4787 9758 4824 9781 4837 9702 4791 9686
      4744 9700 4744 9783
TIME...MOT...LOC 1228Z 270DEG 26KT 4827 9693 4790 9673
          4748 9702

$$

VG

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 Aug 29, 4:15 AM CDT, 2 hours 31 minutes earlier.

Area forecast discussion, Aug 29, 4:15 AM CDT, 2 hours 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
415 AM CDT THU AUG 29 2013

.SHORT TERM...(TODAY THROUGH FRIDAY)
ISSUED AT 415 AM CDT THU AUG 29 2013

MAIN CONCERN WILL BE SEVERE THUNDERSTORM CHANCES. AT 09Z...THERE
IS AN ELEVATED WARM FRONT PROPAGATING NORTHWARD THROUGH THE
SOUTHERN FA. MEANWHILE...THERE IS 25-30 KNOT 850MB JET FOCUSED
INTO CENTRAL NORTH DAKOTA. THESE FORCING MECHANISMS ARE
RESPONSIBLE FOR A COUPLE THUNDER COMPLEXES WHICH WILL AFFECT THE
FA THIS MORNING. ALL OF THIS IS OCCURRING AHEAD OF THE MAIN
SHORTWAVE ACROSS NE MONTANA. ANTICIPATE SCATTERED ACTIVITY AHEAD
OF THE MAIN COMPLEX (POSSIBLY STRONG AT TIMES)...WITH THIS MAIN
COMPLEX MOVING THROUGH THE FA THIS MORNING. MESOSCALE ANALYSIS
SHOWS MUCAPE AROUND 3000 J/KG ACROSS SOUTHEAST NORTH DAKOTA...AND
THE STRONGEST PORTION OF THIS COMPLEX SHOULD MOVE INTO THIS AREA.
THE LOW LEVEL JET WEAKENS AFTER 12Z...SO NOT SURE HOW LONG A
SEVERE THREAT WOULD LAST. ANYWAY...DID MOVE 70% POPS ACROSS MUCH
OF THE FA...AND MAY INCREASE POPS AND MENTION SEVERE AS THE
COMPLEX GETS A BIT CLOSER. THERE WILL LIKELY BE A BREAK LATER THIS
MORNING INTO THE EARLY AFTERNOON HOURS...WITH REDEVELOPMENT OF
STORMS IN THE AFTERNOON AS THE MAIN SHORTWAVE MOVES THROUGH THE
NORTHERN PORTION OF THE REGION. MODELS INDICATE A WARM FRONT WILL
BE LOCATED FROM VALLEY CITY TO FARGO TO PARK RAPIDS...WITH A SFC-
925MB LOW PROPAGATING ALONG THIS FEATURE. STRONG INSTABILITY AND
MODERATE DEEP LAYER SHEAR COMBINED WITH STRONG FORCING SHOULD LEAD
TO SEVERE STORMS FROM THE NORTHERN VALLEY INTO NORTHWEST MINNESOTA
AS A COLD FRONT MOVES THROUGH. ALSO...STORMS WILL BE POSSIBLE
ALONG THE WARM FRONT IF THE CAP CAN BE BROKEN. BEST TORNADO THREAT
WOULD BE ALONG THE WARM FRONT...WITH A WIND AND HAIL THREAT AHEAD
OF THE SHORTWAVE TO THE NORTH. DID INCLUDE SEVERE MENTION FOR THIS
AFTERNOON AND EVENING WITH CONFIDENCE MEDIUM TO HIGH.

TEMPERATURES TODAY WILL BE LIMITED TO THE MID-UPPER 80S NORTH OF
THE WARM FRONT...BUT AGAIN INTO THE MID 90S ALONG AND SOUTH OF
THIS FEATURE. MODELS INDICATE MIXING AND SLIGHTLY DRIER DEWPOINTS
SOUTH OF THE FRONT...WHICH WILL PREVENT HEAT ADVISORY CONDITIONS.

FRIDAY LOOKS DRY AND SLIGHTLY COOLER WITH MAX TEMPS MID TO UPPER
80S EVERYWHERE.

.LONG TERM...(FRIDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 415 AM CDT THU AUG 29 2013

FRIDAY NIGHT-SATURDAY NIGHT...A COUPLE SHORTWAVES WILL MOVE
THROUGH THE REGION. THE STRONGEST FEATURE WILL PASS JUST NE OF THE
FA...SENDING A STRONG COLD FRONT THROUGH THE REGION SATURDAY
AFTERNOON. THUNDERSTORM CHANCES EXIST FRIDAY NIGHT AND AGAIN
SATURDAY AFTERNOON. THE STORMS SAT AFTERNOON COULD BE STRONG TO
SEVERE...DEPENDING ON ACTUAL TIMING OF THE FRONT AND INSTABILITY
PARAMETERS.

SUNDAY TO WEDNESDAY...MODELS IN FAIR AGREEMENT WITH THE EXTENDED
TIME FRAME AS 500MB FLOW BECOMES NORTHWESTERLY ACROSS THE NORTHERN
PLAINS WITH STRONG RIDGE HAVING RETROGRADED BACK OVER THE
INTERMOUNTAIN WEST AND SHORT WAVE ENERGY...STRENGTHENING
TROUGH...ACROSS THE GREAT LAKES ON SUNDAY. MUCH COOLER AND LESS
ACTIVE AS THERMAL PROFILE IN PLACE BY SUNDAY WITH 850MB TEMPS DOWN
IN THE SINGLE DIGITS THOUGH SOME LINGERING SHOWERS ARE POSSIBLE IN
THE EAST. DRY WEATHER ON MONDAY AND TUESDAY WITH SFC HIGH PRESSURE
IN PLACE OVER THE CWFA. BY WEDNESDAY WIDE MODEL SOLNS EXISTS AS
GFS BUILDS UPPER RIDGE INTO SOUTHERN CANADA WHERE ECMWF BRINGS
ANOTHER POTENT SHORTWAVE AND AUTUMN LIKE AIRMASS INTO THE NORTHERN
PLAINS.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z THURSDAY NIGHT)
ISSUED AT 1120 PM CDT WED AUG 28 2013

THE CHANCE FOR SHOWERS AND STORMS WILL INCREASE FROM WEST TO EAST
BY LATE TONIGHT INTO THU. EXPECT MAINLY VFR CONDITIONS...ALTHOUGH
MVFR AND EVEN IFR CONDITIONS ARE POSSIBLE NEAR STRONGER STORMS
CONTAINING VERY HEAVY RAIN AND STRONGER WINDS. THE BEST CHANCE FOR
PROLONGED RAIN TOMORROW SHOULD OCCUR ACROSS THE NORTH.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...NONE.
MN...NONE.
&&

SHORT TERM...TG
LONG TERM...TG/JK
AVIATION...DK

Hazardous weather outlook, Aug 29, 4:56 AM CDT, 1 hour 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND FORKS ND
456 AM CDT THU AUG 29 2013

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-301200-
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-
456 AM CDT THU AUG 29 2013

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS TODAY. THERE WILL
BE TWO ROUNDS OF STORMS. THE FIRST ROUND WILL MOVE THROUGH THE
REGION THIS MORNING. THE POTENTIAL EXISTS FOR STRONG WINDS AND
LARGE HAIL...ALONG WITH HEAVY RAINFALL THIS MORNING. THE SECOND
ROUND OF STORMS WILL DEVELOP THIS AFTERNOON. THE MORE WIDESPREAD
ACTIVITY WILL BE ACROSS THE NORTHERN VALLEY INTO NORTHWEST
MINNESOTA...WITH MORE ISOLATED TO SCATTERED ACTIVITY TO THE
SOUTH. STRONG WINDS...LARGE HAIL...AND A FEW TORNADOS ARE THE MAIN
THREATS...ALONG WITH HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THUNDERSTORMS ARE POSSIBLE FRIDAY NIGHT AND AGAIN SATURDAY
AFTERNOON. SOME OF THE STORMS MAY BE STRONG TO SEVERE SATURDAY
AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

TG

In the hours before

Special weather statement, Aug 29, 1:30 AM CDT, 5 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
130 AM CDT THU AUG 29 2013

NDZ049-052-053-290730-
RANSOM ND-RICHLAND ND-SARGENT ND-
130 AM CDT THU AUG 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN RICHLAND...
NORTHEASTERN SARGENT AND SOUTHEASTERN RANSOM COUNTIES UNTIL 230 AM
CDT...

AT 125 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 6 MILES EAST OF MILNOR...OR 35 MILES WEST OF WAHPETON...
MOVING TO THE NORTHEAST AT 15 MPH.

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

THE STORM WILL BE NEAR...
DE LAMERE AROUND 135 AM CDT.
WYNDMERE AROUND 155 AM CDT.
MCLEOD AROUND 205 AM CDT.

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

LAT...LON 4660 9719 4644 9688 4614 9728 4626 9745
TIME...MOT...LOC 0630Z 216DEG 12KT 4625 9733

TG

Special weather statement, Aug 29, 4:55 AM CDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
455 AM CDT THU AUG 29 2013

MNZ002-NDZ030-039-291045-
CASS ND-NORMAN MN-TRAILL ND-
455 AM CDT THU AUG 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR EXTREME NORTHWESTERN NORMAN
COUNTY IN NORTHWEST MINNESOTA...AND TRAILL AND NORTHERN CASS COUNTIES
IN SOUTHEAST NORTH DAKOTA UNTIL 545 AM CDT...

AT 451 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 14 MILES SOUTHWEST OF HILLSBORO...OR 30 MILES NORTHWEST
OF FARGO...MOVING TO THE NORTHEAST AT 20 MPH.

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

THE STORM WILL BE NEAR...
GRANDIN AROUND 505 AM CDT.
BLANCHARD AROUND 510 AM CDT.
KELSO AROUND 520 AM CDT.
HILLSBORO AROUND 535 AM CDT.

FOR MOTORISTS ON INTERSTATE 29...THE STORM WILL BE BETWEEN...MILE
MARKER 91 AROUND 505 AM CDT...AND MILE MARKER 115 AROUND 545 AM
CDT...

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

LAT...LON 4762 9727 4750 9685 4710 9706 4724 9744
TIME...MOT...LOC 0955Z 205DEG 17KT 4725 9719

JK

Special weather statement, Aug 29, 5:08 AM CDT, 1 hour 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
508 AM CDT THU AUG 29 2013

NDZ006-014-015-024-291115-
BENSON ND-EDDY ND-RAMSEY ND-TOWNER ND-
508 AM CDT THU AUG 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN TOWNER...RAMSEY...EDDY
AND BENSON COUNTIES UNTIL 615 AM CDT...

AT 505 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
THUNDERSTORMS ALONG A LINE EXTENDING FROM 16 MILES NORTHWEST OF LEEDS
TO 14 MILES SOUTHWEST OF NEW ROCKFORD...MOVING TO THE EAST AT 30 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THE STORMS.

THE STORMS WILL BE NEAR...
LEEDS AROUND 515 AM CDT.
BRINSMADE AROUND 525 AM CDT.
NEW ROCKFORD...OBERON AND MINNEWAUKAN AROUND 530 AM CDT.
SHEYENNE AROUND 535 AM CDT.

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

LAT...LON 4838 9951 4854 9950 4852 9853 4758 9852
      4758 9926 4759 9927 4766 9927 4767 9930
      4784 9931 4784 9957 4838 9970
TIME...MOT...LOC 1008Z 268DEG 27KT 4849 9959 4757 9936

JK

Local storm report, Aug 29, 5:56 AM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
556 AM CDT THU AUG 29 2013

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

0530 AM     TSTM WND GST     NEW ROCKFORD            47.68N 99.14W
08/29/2013  E60 MPH          EDDY               ND   LAW ENFORCEMENT

            ESTIMATED AT 60MPH...CAR WAS SHAKING VIOLENTLY

&&

TGRAFENA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 1:30 AM CDT	Special Weather Statement	FGF	Richland	60 min
Aug 29, 1:48 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland	57 min
Aug 29, 3:23 AM CDT	Severe Thunderstorm Warning	FGF	Cass	52 min
Aug 29, 4:55 AM CDT	Special Weather Statement	FGF	Traill	50 min
Aug 29, 5:08 AM CDT	Special Weather Statement	FGF	Benson, Eddy, Ramsey	67 min
Aug 29, 5:22 AM CDT	Severe Thunderstorm Warning	FGF	Eddy	38 min
Aug 29, 5:51 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Griggs, Nelson, Steele	54 min
Aug 29, 7:39 AM CDT	Special Weather Statement	FGF	Pembina, Walsh	66 min
Aug 29, 7:38 AM CDT	Special Weather Statement	FGF	Polk, Red Lake	37 min
Aug 29, 8:42 AM CDT	Special Weather Statement	FGF	Clearwater	63 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2013 Severe Thunderstorm Warnings in Minnesota, 2013 Every severe thunderstorm warning in 2013

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.