Tornado Watch 496

Issued

Jun 9, 2003, 6:50 PM CDT (23:50 UTC)

Expired

Jun 10, 2003, 1:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Omaha radar (KOAX), 98 km from the middle of the area, began a volume at 23:51 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 1278Jun 9, 7:23 PM CDT
• Mesoscale Discussion 1283Jun 9, 8:52 PM CDT
• Mesoscale Discussion 1285Jun 9, 9:22 PM CDT
• Mesoscale Discussion 1288 Severe thunderstorm watch 500Jun 9, 11:20 PM CDT

000 
WWUS20 KWNS 092348
SEL6  
SPC WW 092350
IAZ000-NEZ000-SDZ000-100600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 496 
NWS STORM PREDICTION CENTER NORMAN OK 
650 PM CDT MON JUN 9 2003

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

       NORTHWEST IOWA
       NORTHEAST NEBRASKA
       EXTREME SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 650 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 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES NORTH NORTHWEST OF SIOUX CITY IOWA TO 50
MILES SOUTHEAST OF NORFOLK 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 SEVERE
THUNDERSTORM WATCH NUMBER 495. WATCH NUMBER 495 WILL NOT BE IN
EFFECT AFTER 650 PM CDT. CONTINUE...WW 491...WW 492...WW 493...WW
494...


DISCUSSION...SUPERCELL TORNADO THREAT APPEARS TO BE INCREASING WITH
STORMS ALONG THE WARM FRONT IN NE NEB.	LOW-LEVEL MOISTURE IS
INCREASING ACROSS THIS AREA FROM THE SW WITH TIME...WHILE DEEP LAYER
AND LOW-LEVEL SHEAR IS SUFFICIENT FOR SUPERCELLS AND A TORNADO
THREAT.  ADDITIONALLY...THE MOST INTENSE STORMS COULD PRODUCE VERY
LARGE HAIL.

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 27025.


...THOMPSON

425,0951 412,0951 412,0981 425,0981

Tornado Watches in Nebraska, 2003Tornado Watches in Iowa, 2003Tornado Watches in South Dakota, 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.