Alert archive / North Dakota / Tornado Watches in 2001

Tornado Watch 653

August 4, 200117 counties in North Dakota

The Storm Prediction Center issued this tornado watch at Aug 4, 2001, 4:30 PM CDT for 17 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2001, 4:30 PM CDT (21:30 UTC)
Expired: Aug 4, 2001, 10:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Benson County, ND, Bottineau County, ND, Burke County, ND, Dunn County, ND, Eddy County, ND, Foster County, ND, McHenry County, ND, McLean County, ND, Mountrail County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Towner County, ND, Ward County, ND, Wells County, ND

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Aug 4, 4:32 PM CDT	Severe Thunderstorm Warning	BIS	Burke	58 min

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.5 hours before the alert went out and 176 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: 3168 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: -78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

854 
WWUS9 KMKC 042118
SEL3  
MKC WW 042113
NDZ000-050300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 653
STORM PREDICTION CENTER NORMAN OK
413 PM CDT SAT AUG 4 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   NORTHERN NORTH DAKOTA                       

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 430 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 65 MILES WEST NORTHWEST OF ROSEGLEN NORTH
DAKOTA TO 20 MILES EAST NORTHEAST OF DEVILS LAKE NORTH DAKOTA.

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 652...

DISCUSSION...EXTREME INSTABILITY ACROSS ND WITH CAPES ABOVE 5000
J/KG.  APPROACH OF S/WV TROUGH AND WEAK SURFACE TROUGH SUFFICIENT
FOR INITIATION OF STORMS NWRN ND.  STORMS EXPECTED TO RAPIDLY
BECOME SEVERE AND WITH MODERATE DEEP LAYER SHEER SUPERCELLS LIKELY. 
PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING WINDS WITH
SUPERCELLS BUT ISOLATED TORNADOES LIKELY.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 650. 
MEAN STORM MOTION VECTOR 23025.


...HALES

485,1030 490,0983 472,0983 471,1030

Nearby

Tornado Watches in North Dakota, 2001 Every tornado watch in 2001

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.