Tornado Watch 491

Issued

Jun 9, 2003, 2:55 PM CDT (19:55 UTC)

Expired

Jun 9, 2003, 9:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The North Platte radar (KLNX), 192 km from the middle of the area, began a volume at 19:58 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.

• Mesoscale Discussion 1271Jun 9, 2:05 PM CDT
• Mesoscale Discussion 1275Jun 9, 5:00 PM CDT
• Mesoscale Discussion 1277Jun 9, 6:30 PM CDT
• Mesoscale Discussion 1278Jun 9, 7:23 PM CDT
• Mesoscale Discussion 1281Jun 9, 8:13 PM CDT

000 
WWUS20 KWNS 091959
SEL1  
SPC WW 091955
NEZ000-SDZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 491 
NWS STORM PREDICTION CENTER NORMAN OK 
255 PM CDT MON JUN 9 2003

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

       NORTH CENTRAL NEBRASKA
       CENTRAL SOUTH DAKOTA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 255 PM UNTIL 900
PM 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 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES NORTH OF PIERRE SOUTH DAKOTA TO 35 MILES
SOUTH 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.




DISCUSSION...CAP CONTINUES TO WEAKEN ACROSS WW AHEAD OF SURFACE LOW
AND VIGOROUS UPPER LOW NOW MOVING OUT OF THE NRN HIGH PLAINS.  IN
ADDITION... MODIFIED 18Z SOUNDINGS FROM RAP AND LBF INDICATE MLCAPES
BETWEEN 1500-2500 J/KG ARE ALREADY IN PLACE...AND FURTHER
DESTABILIZATION IS LIKELY TODAY ALONG NRN EXTENT OF 60+F SURFACE DEW
POINT AXIS.  STORMS SHOULD DEVELOP QUICKLY IN THE NEXT 1-2
HOURS...AND GIVEN THE BACKED BOUNDARY LAYER FLOW AHEAD OF SURFACE
LOW...LOW LEVEL SHEAR/HELCITY WILL BE ENHANCED AND INCREASE THE
THREAT OF 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 500.
MEAN STORM MOTION VECTOR 27020.


...EVANS

443,0983 420,0981 420,1013 443,1020 

WWUS20 KWNS 091959
SEL1  
SPC WW 091955
NEZ000-SDZ000-100200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 491 
NWS STORM PREDICTION CENTER NORMAN OK 
255 PM CDT MON JUN 9 2003

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

       NORTH CENTRAL NEBRASKA
       CENTRAL SOUTH DAKOTA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 255 PM UNTIL 900
PM 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 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES NORTH OF PIERRE SOUTH DAKOTA TO 35 MILES
SOUTH 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.




DISCUSSION...CAP CONTINUES TO WEAKEN ACROSS WW AHEAD OF SURFACE LOW
AND VIGOROUS UPPER LOW NOW MOVING OUT OF THE NRN HIGH PLAINS.  IN
ADDITION... MODIFIED 18Z SOUNDINGS FROM RAP AND LBF INDICATE MLCAPES
BETWEEN 1500-2500 J/KG ARE ALREADY IN PLACE...AND FURTHER
DESTABILIZATION IS LIKELY TODAY ALONG NRN EXTENT OF 60+F SURFACE DEW
POINT AXIS.  STORMS SHOULD DEVELOP QUICKLY IN THE NEXT 1-2
HOURS...AND GIVEN THE BACKED BOUNDARY LAYER FLOW AHEAD OF SURFACE
LOW...LOW LEVEL SHEAR/HELCITY WILL BE ENHANCED AND INCREASE THE
THREAT OF 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 500.
MEAN STORM MOTION VECTOR 27020.


...EVANS

443,0983 420,0981 420,1013 443,1020

Tornado Watches in South Dakota, 2003Tornado Watches in Nebraska, 2003Every tornado watch in 2003

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.