Tornado Watch 393

Issued

May 30, 2000, 7:30 PM CDT (00:30 UTC)

Expired

May 31, 2000, 1:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Des Moines radar (KDMX), 54 km from the middle of the area, began a volume at 00:34 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.

000 
WWUS9 KMKC 310003
MKC WW 310003
IAZ000-WIZ000-310600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 393
STORM PREDICTION CENTER NORMAN OK
703 PM CDT TUE MAY 30 2000

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

   IOWA                               
   EXTREME SOUTHWEST WISCONSIN                          

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 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 90 STATUTE MILES EAST AND WEST
OF A LINE FROM 30 MILES SOUTH SOUTHEAST OF DES MOINES IOWA TO 60
MILES NORTH NORTHEAST OF WATERLOO IOWA.

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...THUNDERSTORMS ARE DEVELOPING OVER CENTRAL IOWA IN LOW
LEVEL WARM ADVECTION ZONE NORTH OF EAST/WEST BOUNDARY ACROSS SRN
IOWA.  AIR MASS IS QUITE UNSTABLE WITH SBCAPE NEAR 5000 J/KG OVER
SWRN IOWA...AND 2000-3000 J/KG OVER CENTRAL/ERN IOWA.  VERTICAL
WIND STRUCTURE ON AREA VAD AND PROFILER DATA SHOW STRONG VEERING
WITH HEIGHT AND FAVORABLE DEEP LAYER SHEAR AND HELICITY FOR
SUPERCELLS TO DEVELOP.


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 550. 
MEAN STORM MOTION VECTOR 25030.


...WEISS

;432,0900 410,0914 410,0951 432,0934;

Tornado Watches in Iowa, 2000Tornado Watches in Wisconsin, 2000Every tornado watch in 2000

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.