Tornado Watch 699

Issued

Jun 29, 1998, 11:15 AM CDT (16:15 UTC)

Expired

Jun 29, 1998, 5:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Omaha radar (KOAX), 138 km from the middle of the area, began a volume at 16:16 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.

100 
WWUS9 KMKC 291601
SEL9  
MKC WW 291601
IAZ000-NEZ000-292200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 699
STORM PREDICTION CENTER NORMAN OK
1101 AM CDT MON JUN 29 1998

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

   NORTHERN AND WESTERN IOWA                               
   EASTERN NEBRASKA                           

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1115 AM UNTIL 500
PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 85 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 125 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES SOUTH SOUTHEAST OF SIOUX CITY IOWA TO 30
MILES NORTHWEST OF MASON CITY 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...SUPERCELL POTENTIAL LIKELY TO INCREASE EWD ACROSS IA
LATER TODAY AS SPEED MAX ROUNDING BASE OF S CENTRAL CANADA UPPER
LOW SWEEPS EWD.  VERY LARGE HAIL/HIGH WINDS AND ISOLATED TORNADOES
POSSIBLE GIVEN DEGREE OF CAPE /ABOVE 4000 J/KG/ AND STRENGTH OF
SHEAR /50 KT WNW FLOW AT 500 MB AT THE MOMENT...EXPECTED TO
INCREASE TO ABOVE 60 KTS BY THIS AFTERNOON/.  

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 75 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 520. 
MEAN STORM MOTION VECTOR 28040.

...CORFIDI

414,0982 432,0961 432,0911 414,0933

Tornado Watches in Iowa, 1998Tornado Watches in Nebraska, 1998Tornado Watches in South Dakota, 1998Every tornado watch in 1998

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.