Tornado Watch 623

Issued

Jul 19, 2006, 9:44 PM CDT (02:44 UTC)

Expired

Jul 20, 2006, 3:35 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Minneapolis radar (KMPX), 143 km from the middle of the area, began a volume at 02:45 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.

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1572Jul 19, 7:57 PM CDT
• Mesoscale Discussion 1575Jul 19, 10:48 PM CDT
• Mesoscale Discussion 1577Jul 20, 2:55 AM CDT

000 
WWUS20 KWNS 200245
SEL3  
SPC WW 200245
IAZ000-MNZ000-201000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 623
NWS STORM PREDICTION CENTER NORMAN OK
945 PM CDT WED JUL 19 2006

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

       NORTHERN IOWA
       SOUTHERN MINNESOTA

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 945 PM
UNTIL 500 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH NORTHWEST OF
SPENCER IOWA TO 45 MILES NORTH NORTHEAST OF WATERLOO IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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 620. WATCH NUMBER 620 WILL NOT BE IN EFFECT AFTER
945 PM CDT. CONTINUE...WW 621...WW 692...

DISCUSSION...SUPERCELLS EXPECTED TO FORM/INTENSIFY IN STRENGTHENING
WARM ADVECTION ZONE ON SRN FRINGE OF PASSING MID LEVEL SPEED MAX. 
ABSENCE OF STRONG LINEAR FORCING...BACKED LOW LEVEL FLOW AND RICH
BOUNDARY LAYER MOISTURE CONTENT SUGGEST POTENTIAL FOR TORNADOES
DESPITE SLIGHTLY ELEVATED NATURE OF STORMS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28030.


...CORFIDI

Tornado Watches in Iowa, 2006Tornado Watches in Minnesota, 2006Every tornado watch in 2006

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.