Alert archive / North Dakota / Tornado Warnings in 2007

Tornado Warning 31, NWS Grand Forks, ND

August 10, 2007Nelson County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 10, 2007, 2:35 PM CDT for Nelson County, North Dakota. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 10, 2007, 2:35 PM CDT (19:35 UTC)
Expired
Aug 10, 2007, 3:15 PM CDT
In force
40 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

County Nelson County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 92 km from the middle of the area, began a volume at 19:36 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.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.6 hours before the alert went out and 225 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 2007-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1398 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 2007-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.19395878Sfc1 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
1398 J/kg
Mixed-layer CIN
-392 J/kg
Mixed-layer LCL
1454 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFGF 101935
TORFGF
NDC063-102015-
/O.NEW.KFGF.TO.W.0031.070810T1935Z-070810T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
235 PM CDT FRI AUG 10 2007

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL NELSON COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 315 PM CDT

* AT 230 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES
  NORTHWEST OF STUMP LAKE...OR 22 MILES SOUTHEAST OF DEVILS LAKE...
  MOVING TO THE NORTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  LAKOTA AT 245 PM CDT...
  MAPES AT 255 PM CDT...

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

IF YOU ARE IN THE PATH OF A TORNADO THE SAFEST PLACE IS A BASEMENT.
GET UNDER A STAIRWAY OR A PIECE OF STURDY FURNITURE.

LAT...LON 4800 9849 4783 9846 4808 9804 4811 9821

$$

WJB
2 follow-up statements
000 
WWUS53 KFGF 101958
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
256 PM CDT FRI AUG 10 2007

NDC063-102015-
/O.CON.KFGF.TO.W.0031.000000T0000Z-070810T2015Z/
NELSON ND-
256 PM CDT FRI AUG 10 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR CENTRAL
NELSON COUNTY...

AT 250 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. AT ABOUT 230 PM
A TOUCHDOWN WAS REPORTED BY A CITIZEN NEAR STUMP LAKE. AT THE
SAME TIME A TREE PIERCED THE ROOF OF A HOUSE IN THE SAME AREA. THE 
TORNADO WAS LOCATED 3 MILES NORTHEAST OF LAKOTA...OR 26 MILES EAST 
OF DEVILS LAKE...MOVING TO THE NORTHEAST AT 30 MPH.

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

IF YOU ARE IN THE PATH OF A TORNADO THE SAFEST PLACE IS A BASEMENT.
GET UNDER A STAIRWAY OR A PIECE OF STURDY FURNITURE.

LAT...LON 4800 9849 4783 9846 4808 9804 4811 9821

$$

WJB
000 
WWUS53 KFGF 102016
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
316 PM CDT FRI AUG 10 2007

NDC063-102026-
/O.EXP.KFGF.TO.W.0031.000000T0000Z-070810T2015Z/
NELSON ND-
316 PM CDT FRI AUG 10 2007

...THE TORNADO WARNING FOR CENTRAL NELSON COUNTY EXPIRED AT 315 PM
CDT...

AT 316 PM CDT...THE TORNADO HAS MOVED OUT OF CENTRAL NELSON COUNTY.
SO THE WARNING WAS ALLOWED TO EXPIRE AT 315 PM CDT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
FRIDAY EVENING FOR NORTHWESTERN MINNESOTA.

LAT...LON 4800 9849 4783 9846 4808 9804 4811 9821

$$

WB/JK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 11:23 AM CDTSevere Thunderstorm WarningFGFBenson67 min
Aug 10, 12:31 PM CDTSevere Thunderstorm WarningFGFBenson32 min
Aug 10, 1:58 PM CDTSevere Thunderstorm WarningFGFBenson47 min
Aug 10, 2:10 PM CDTTornado WarningFGFBenson, Ramsey44 min
Aug 10, 3:14 PM CDTSevere Thunderstorm WarningFGFGrand Forks46 min

Nearby

Tornado Warnings in North Dakota, 2007Every tornado warning in 2007Tornadoes in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.