Alert archive / Nebraska / Tornado Watches in 2001

Tornado Watch 413

June 12, 200112 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jun 12, 2001, 7:30 PM CDT for 12 counties in Nebraska; 6 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 12, 2001, 7:30 PM CDT (00:30 UTC)
Expired: Jun 13, 2001, 1:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Blaine County, NE, Box Butte County, NE, Brown County, NE, Cherry County, NE, Dawes County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Gregory County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 134 km from the middle of the area, began a volume at 00:31 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:48 PM CDT	Severe Thunderstorm Warning	CYS	Dawes	42 min
Jun 12, 8:27 PM CDT	Severe Thunderstorm Warning	CYS	Dawes	48 min
Jun 12, 8:30 PM CDT	Tornado Warning	LBF	Sheridan	45 min
Jun 12, 9:14 PM CDT	Tornado Warning	LBF	Sheridan	46 min
Jun 12, 9:52 PM CDT	Tornado Warning	LBF	Cherry, Sheridan	38 min
Jun 12, 10:21 PM CDT	Severe Thunderstorm Warning	UNR	Bennett	39 min
Jun 12, 10:25 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	50 min
Jun 12, 10:28 PM CDT	Tornado Warning	LBF	Cherry	47 min
Jun 12, 10:40 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	50 min
Jun 12, 11:11 PM CDT	Severe Thunderstorm Warning	CYS	Box Butte	64 min
Jun 12, 11:14 PM CDT	Tornado Warning	LBF	Cherry	46 min
Jun 12, 11:25 PM CDT	Severe Thunderstorm Warning	UNR	Todd	65 min
Jun 12, 11:28 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	32 min
Jun 12, 11:33 PM CDT	Severe Thunderstorm Warning	UNR	Bennett	57 min
Jun 12, 11:37 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	53 min
Jun 12, 11:46 PM CDT	Tornado Warning	CYS	Box Butte	29 min
Jun 12, 11:54 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	51 min
Jun 13, 12:24 AM CDT	Severe Thunderstorm Warning	UNR	Tripp	51 min
Jun 13, 12:25 AM CDT	Severe Thunderstorm Warning	LBF	Sheridan	65 min
Jun 13, 12:28 AM CDT	Severe Thunderstorm Warning	UNR	Todd	62 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.5 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-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: 642 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 33 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.

000 
WWUS9 KMKC 130018
SEL3  

SEL3  
MKC WW 130014
NEZ000-SDZ000-130600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 413
STORM PREDICTION CENTER NORMAN OK
714 PM CDT TUE JUN 12 2001

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

   NORTHERN NEBRASKA                           
   SOUTHWESTERN SOUTH DAKOTA                       

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 730 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 15 MILES SOUTHWEST OF CHADRON NEBRASKA TO 45
MILES EAST NORTHEAST OF AINSWORTH NEBRASKA.

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...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 408.  WATCH NUMBER 408 WILL NOT BE IN EFFECT AFTER 730 PM
CDT.  CONTINUE...WW 407...WW 409...WW 410...WW 411...WW 412...

DISCUSSION...TORNADIC SUPERCELLS VICINITY SWRN SD/NWRN NEB BORDER
WILL CONTINUE TO PROPAGATE EWD VICINITY E/W FRONTAL ZONE.  AIRMASS
S OF FRONT REMAINS VERY UNSTABLE AND WITH LOW LEVEL JET INCREASING
DURING EVENING...CONDITIONS REMAINS FAVORABLEFOR SUPERCELLS AND
TORNADOES.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. 
MEAN STORM MOTION VECTOR 27030.


...HALES

;433,1031 434,0990 415,0990 414,1031;

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 13, 12:00 AM CDT	Tornado Watch	SPC	Antelope, Boyd, Brown, Cedar, Dakota, Dixon and 5 more	5 hr
Jun 13, 6:15 PM CDT	Tornado Watch	SPC	Burt, Butler, Cass, Cedar, Clay, Colfax and 28 more	6 hr
Jun 13, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Dundy, Franklin, Frontier, Furnas, Gosper and 6 more	5 hr
Jun 13, 4:30 PM CDT	Tornado Watch	SPC	Bon Homme, Brookings, Clark, Codington, Day, Deuel and 16 more	5 hr

Nearby

Tornado Watches in Nebraska, 2001 Tornado Watches in South 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; radar from the NEXRAD Level II archive.