Tornado Watch 503

Issued

Aug 29, 2013, 8:20 PM CDT (01:20 UTC)

Expired

Aug 30, 2013, 1:00 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

The Duluth radar (KDLH), 144 km from the middle of the area, began a volume at 01:23 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1801Aug 29, 7:30 PM CDT
• Mesoscale Discussion 1802Aug 29, 11:57 PM CDT

704 
WWUS20 KWNS 300125
SEL3  
SPC WW 300125
MNZ000-WIZ000-LMZ000-LSZ000-300900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 503
NWS STORM PREDICTION CENTER NORMAN OK
820 PM CDT THU AUG 29 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHEAST MINNESOTA
  NORTHERN AND CENTRAL WISCONSIN
  LAKE MICHIGAN
  LAKE SUPERIOR

* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 820 PM
  UNTIL 400 AM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
    MPH POSSIBLE
  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST SOUTHWEST OF
DULUTH MINNESOTA TO 30 MILES NORTH NORTHEAST OF MANITOWOC
WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...CONTINUE...WW 502...

DISCUSSION...TSTM CLUSTER NOW IN NE MN /BETWEEN BRD AND DLH/
EXPECTED TO CONTINUE ESE INTO NW WI LATER TNGT...IN TANDEM WITH
ASSOCIATED SFC WAVE NOW IN THE VICINITY. OTHER STORMS/CLUSTERS ARE
EXPECTED TO MOVE/DEVELOP ALONG OUTFLOW-REINFORCED WARM FRONT
EXTENDING ESE FROM THE WAVE INTO NRN WI AS LLJ STRENGTHENS AND VEERS
ACROSS REGION. 40+ KT WNWLY DEEP SHEAR AND PRESENCE OF RICH LOW-LVL
MOISTURE BENEATH DEEP EML /SAMPLED BY MSP 00Z/30 RAOB/ SUGGEST
POTENTIAL FOR SUPERCELLS/LEWPS WITH A RISK FOR DMGG WIND AND
POSSIBLY A COUPLE TORNADOES. IN ADDITION TO LOW-LVL WAA...ASCENT
WILL BE PROVIDED BY UPR IMPULSE AMPLIFYING ESE ACROSS MN/SW ONT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 29030.


...CORFIDI

Tornado Watches in Wisconsin, 2013Tornado Watches in Minnesota, 2013Every tornado watch in 2013

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.