Alert archive / North Dakota / Tornado Warnings in 2007

Tornado Warning 4, NWS Grand Forks, ND

May 18, 2007Griggs County, Steele County, North Dakota

NWS Grand Forks, ND issued this tornado warning at May 18, 2007, 6:43 PM CDT for Griggs County, Steele County, North Dakota. It was in force for 62 min. 2 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
May 18, 2007, 6:43 PM CDT (23:43 UTC)
Expired
May 18, 2007, 7:45 PM CDT
In force
62 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

Counties Griggs County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 52 km from the middle of the area, began a volume at 23:47 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

TimeReportWhereRemark
May 18, 6:52 PM CDTTORNADO3 E Walum, NDTORNADO ON THE GROUND 8N OF LUVERNE ON GRIGGS SIDE OF THE COUNTY LINE REPORTED BY TRAINED SPOTTER AT 652 PM. REPORT RELAYED BY STEELE COUNTY LAW ENFORECEMENT.
May 18, 7:00 PM CDTHAIL 0.883 N Luverne, ND

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
May 18, 3:43 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.7 hours before the alert went out and 217 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 2007-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 362 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 2007-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.1939Sfc1 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
362 J/kg
Mixed-layer CIN
-435 J/kg
Mixed-layer LCL
1771 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
89 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.

000 
WFUS53 KFGF 182343
TORFGF
NDC039-091-190045-
/O.NEW.KFGF.TO.W.0004.070518T2343Z-070519T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
643 PM CDT FRI MAY 18 2007

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA...
  SOUTHERN STEELE COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 745 PM CDT

* AT 638 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES NORTH OF
  LUVERNE...OR 29 MILES NORTH OF VALLEY CITY...MOVING TO THE EAST AT
  20 MPH.

* THE TORNADO WILL BE NEAR...
  BLABON AT 700 PM CDT...
  HOPE AT 715 PM CDT...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
FRIDAY EVENING FOR NORTHWEST MINNESOTA.

LAT...LON 4748 9818 4724 9823 4725 9776 4748 9755

$$

JK/BB
3 follow-up statements
000 
WWUS53 KFGF 182357
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
655 PM CDT FRI MAY 18 2007

NDC039-091-190045-
/O.CON.KFGF.TO.W.0004.000000T0000Z-070519T0045Z/
GRIGGS ND-STEELE ND-
655 PM CDT FRI MAY 18 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN GRIGGS AND SOUTHWESTERN STEELE COUNTIES...

AT 652 PM CDT...A TORNADO WAS SPOTTED 3 MILES EAST OF WALLUM.
...MOVING TO THE EAST AT 15 MPH. THE TORNADO WILL CONTINUE ALONG THE 
GRIGGS...BARNES AND STEELE COUNTY LINE NORTH OF DAZEY AND SIBLEY.

* THE TORNADO WILL BE NEAR...
  RURAL SOUTHEASTERN GRIGGS COUNTY AT 710 PM CDT
  RURAL SOUTHWESTERN STEELE COUNTY AT 720 PM CDT

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
FRIDAY EVENING FOR NORTHWEST MINNESOTA.

LAT...LON 4739 9821 4725 9823 4725 9776 4731 9784

$$
DK
000 
WWUS53 KFGF 190019
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
719 PM CDT FRI MAY 18 2007

NDC039-091-190045-
/O.CON.KFGF.TO.W.0004.000000T0000Z-070519T0045Z/
GRIGGS ND-STEELE ND-
719 PM CDT FRI MAY 18 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN GRIGGS AND SOUTHWESTERN STEELE COUNTIES...

AT 718 PM CDT...DOPPLER RADAR INDICATED A TORNADO. THE TORNADO WAS
LOCATED 5 MILES NORTHWEST OF SIBLEY...OR 23 MILES NORTH OF VALLEY 
CITY...MOVING TO THE SOUTH AT 5 MPH.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
FRIDAY EVENING FOR NORTHWEST MINNESOTA.

LAT...LON 4738 9821 4725 9815 4725 9776 4739 9789

$$

JK/BB
000 
WWUS53 KFGF 190044
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
744 PM CDT FRI MAY 18 2007

NDC039-091-190054-
/O.EXP.KFGF.TO.W.0004.000000T0000Z-070519T0045Z/
GRIGGS ND-STEELE ND-
744 PM CDT FRI MAY 18 2007

...THE TORNADO WARNING FOR SOUTHEASTERN GRIGGS AND SOUTHWESTERN
STEELE COUNTIES WILL EXPIRE AT 745 PM CDT...

DOPPLER RADAR INDICATED THE STORM WAS NO LONGER SEVERE AND SO THE
WARNING WILL BE ALLOWED TO EXPIRE AT 745 PM CDT. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
FRIDAY EVENING FOR NORTHWEST MINNESOTA.

LAT...LON 4738 9821 4725 9815 4725 9776 4739 9789

$$

BB

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 5:16 PM CDTSevere Thunderstorm WarningFGFGriggs, Steele59 min
May 18, 6:15 PM CDTSevere Thunderstorm WarningFGFGriggs, Steele60 min
May 18, 6:47 PM CDTTornado WarningFGFBarnes58 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.