Alert archive / North Dakota / Tornado Watches in 2007
Tornado Watch 470
The Storm Prediction Center issued this tornado watch at Jul 1, 2007, 3:02 PM MDT for 32 counties in North Dakota; 4 counties in South Dakota. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2007, 3:02 PM MDT (21:02 UTC)
- Expired
- Jul 1, 2007, 11:00 PM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 36 counties
Adams County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Wells County, ND, Williams County, ND, Campbell County, SD, Corson County, SD, Harding County, SD, Perkins County, SD
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 5:21 PM MDT | Severe Thunderstorm Warning | ABR | Corson, Dewey | 54 min |
| Jul 1, 5:29 PM MDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Sioux | 61 min |
| Jul 1, 5:46 PM MDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 59 min |
| Jul 1, 6:14 PM MDT | Severe Thunderstorm Warning | ABR | Corson, Dewey | 33 min |
| Jul 1, 6:41 PM MDT | Severe Thunderstorm Warning | BIS | Morton, Sioux | 49 min |
| Jul 1, 7:05 PM MDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons | 55 min |
| Jul 1, 8:02 PM MDT | Tornado Warning | BIS | Grant | 43 min |
| Jul 1, 8:11 PM MDT | Tornado Warning | BIS | Morton | 34 min |
| Jul 1, 8:17 PM MDT | Severe Thunderstorm Warning | BIS | Burleigh | 43 min |
| Jul 1, 8:44 PM MDT | Severe Thunderstorm Warning | BIS | Morton | 61 min |
| Jul 1, 8:45 PM MDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 40 min |
| Jul 1, 9:19 PM MDT | Severe Thunderstorm Warning | BIS | Oliver | 41 min |
| Jul 1, 9:38 PM MDT | Severe Thunderstorm Warning | BIS | Kidder, Logan | 37 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 9.0 hours before the alert went out and 150 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.
- Mixed-layer CAPE
- 654 J/kg
- Mixed-layer CIN
- -455 J/kg
- Mixed-layer LCL
- 1180 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 012103
SEL0
SPC WW 012103
NDZ000-SDZ000-020500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 470
NWS STORM PREDICTION CENTER NORMAN OK
405 PM CDT SUN JUL 1 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN AND CENTRAL NORTH DAKOTA
NORTHERN SOUTH DAKOTA
EFFECTIVE THIS SUNDAY AFTERNOON FROM 405 PM UNTIL MIDNIGHT CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHWEST OF
MINOT NORTH DAKOTA TO 35 MILES SOUTH SOUTHEAST OF LEMMON SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 468...WW 469...
DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO FORM IN THE NEXT 1-2 HRS
IN AREA OF SUSTAINED WAA NE OF STATIONARY WRN SD SFC LOW. 50 KT
DEEP WSWLY SHEAR WITH A SUBSTANTIAL LOW LEVEL DIRECTIONAL COMPONENT
SUGGESTS ACTIVITY MAY POSE A THREAT FOR TORNADOES IN ADDITION TO SVR
HAIL/WIND GIVEN SBCAPE AOA 2000 J/KG.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 26030.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 2:45 PM MDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Burleigh, Dunn, Emmons and 16 more | 90 min |
| Jul 1, 4:28 PM MDT | Mesoscale Discussion | SPC | Fall River, Haakon, Jackson, Meade, Oglala Lakota, Pennington and 1 more | 62 min |
| Jul 1, 4:53 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Dewey, Fall River, Haakon and 8 more | 5 hr |
Nearby
Tornado Watches in North Dakota, 2007Tornado Watches in South Dakota, 2007Every tornado watch 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.