Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 39, NWS Grand Forks, ND

July 17, 2011Eddy County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 17, 2011, 12:33 PM CDT for Eddy County, North Dakota. It was in force for 42 min. 7 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 17, 2011, 12:33 PM CDT (17:33 UTC)
Expired
Jul 17, 2011, 1:15 PM CDT
In force
42 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon

County Eddy County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 127 km from the middle of the area, began a volume at 17:36 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

TimeReportWhereRemark
Jul 17, 12:55 PM CDTHAIL 11 W New Rockford, ND
Jul 17, 1:05 PM CDTHAIL 0.75Sheyenne, ND
Jul 17, 1:06 PM CDTHAIL 1.75New Rockford, ND
Jul 17, 1:07 PM CDTTSTM WND DMG4 S New Rockford, ND2 POWER POLES SNAPPED ALONG US HIGHWAY 281
Jul 17, 1:07 PM CDTTSTM WND DMGNew Rockford, NDHIGH WINDS IN TOWN BLEW DOWN TREES WITH SOME STREET FLOODING DUE TO THE HEAVY RAIN.
Jul 17, 1:08 PM CDTTORNADO 14 Sse New Rockford, NDCLEAR DAMAGE PATH FROM HIGHWAY 281 4S NEW ROCKFORD THROUGH SHELTER-BELT EAST OF 281
Jul 17, 1:09 PM CDTTORNADO 14 S New Rockford, NDTORNADO TRACKED FOR AT LEAST A MILE TO AROUND 5 MILES SSE OF NEW ROCKFORD BY 112 PM CDT. TORNADO BROKE DOWN TWO POWER POLES ALONG THE WEST SIDE OF HWY 281 AND SEVERELY DAMAGED SEVERAL TREES IN A SHELTER BELT EAST OF HWY 281. MAXIMUM WIDTH ESTIMATED TO 150 YARD

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.

IssuedProductOfficeLasted
Jul 17, 9:58 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 5.6 hours before the alert went out and 166 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2011-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4227 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2011-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
4227 J/kg
Mixed-layer CIN
-184 J/kg
Mixed-layer LCL
1037 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
0.0
Supercell composite
37.4

Open this sounding in Storm Lab

The text

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

878 
WFUS53 KFGF 171733
TORFGF
NDC027-171815-
/O.NEW.KFGF.TO.W.0039.110717T1733Z-110717T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1233 PM CDT SUN JUL 17 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  EDDY COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 115 PM CDT

* AT 1232 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM WAS
  LOCATED 3 MILES SOUTHWEST OF BREMEN...OR 36 MILES SOUTHWEST OF
  DEVILS LAKE...MOVING TO THE EAST AT 40 MPH.

* THE TORNADIC STORM WILL BE NEAR...
  SHEYENNE AROUND 1250 PM CDT.
  NEW ROCKFORD AROUND 1255 PM CDT.
  BRANTFORD AROUND 110 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES
FOR A STURDY BUILDING.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4785 9860 4758 9863 4759 9927 4766 9927
      4767 9930 4785 9931
TIME...MOT...LOC 1733Z 280DEG 33KT 4773 9940

$$

JK
1 follow-up statement
354 
WWUS53 KFGF 171804
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
104 PM CDT SUN JUL 17 2011

NDC027-171815-
/O.CON.KFGF.TO.W.0039.000000T0000Z-110717T1815Z/
EDDY ND-
104 PM CDT SUN JUL 17 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EDDY COUNTY IN NORTHEAST
NORTH DAKOTA UNTIL 115 PM CDT...

AT 1259 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR NEW
ROCKFORD...OR 34 MILES SOUTH OF DEVILS LAKE...MOVING TO THE SOUTHEAST
AT 30 MPH.

IN ADDITION...QUARTER SIZED HAIL WAS REPORTED ONE MILE WEST OF NEW 
ROCKFORD AT 1255 PM WITH THIS STORM.

THE TORNADIC STORM WILL BE NEAR...
  BRANTFORD AROUND 115 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES
FOR A STURDY BUILDING.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4785 9860 4758 9863 4759 9927 4766 9927
      4767 9930 4785 9931
TIME...MOT...LOC 1803Z 294DEG 27KT 4765 9911

$$

JK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 7:10 PM CDTTornado WarningFGFGriggs50 min
Jul 16, 7:53 PM CDTTornado WarningFGFBenson, Ramsey52 min
Jul 16, 8:36 PM CDTTornado WarningFGFBenson, Ramsey39 min
Jul 16, 9:24 PM CDTTornado WarningFGFBenson, Nelson, Ramsey51 min
Jul 16, 10:02 PM CDTFlash Flood WarningFGFNelson, Ramsey10 hr
Jul 16, 10:41 PM CDTAreal Flood AdvisoryFGFPembina, Walsh8 hr
Jul 16, 11:08 PM CDTSevere Thunderstorm WarningFGFWalsh52 min
Jul 17, 11:45 AM CDTSevere Thunderstorm WarningFGFBenson60 min
Jul 17, 1:11 PM CDTTornado WarningFGFEddy49 min
Jul 17, 2:24 PM CDTTornado WarningFGFBarnes, Griggs36 min
Jul 17, 2:57 PM CDTTornado WarningFGFBarnes, Griggs48 min
Jul 17, 3:34 PM CDTTornado WarningFGFBarnes, Griggs, Steele41 min
Jul 17, 4:12 PM CDTTornado WarningFGFBarnes, Cass63 min
Jul 17, 5:13 PM CDTTornado WarningFGFCass45 min

Nearby

Tornado Warnings in North Dakota, 2011Every tornado warning in 2011Tornadoes 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.