Tornado Watch 310

Issued

Jun 17, 2014, 4:11 AM CDT (09:11 UTC)

Expired

Jun 17, 2014, 6:43 AM CDT

In force

3 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

65 kt

The Milwaukee radar (KMKX), 81 km from the middle of the area, began a volume at 09:12 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

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1032Jun 17, 1:29 AM CDT
• Mesoscale Discussion 1033Jun 17, 3:41 AM CDT
• Mesoscale Discussion 1034Jun 17, 4:58 AM CDT

577 
WWUS20 KWNS 170915
SEL0  
SPC WW 170915
ILZ000-INZ000-WIZ000-LMZ000-171400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 310
NWS STORM PREDICTION CENTER NORMAN OK
410 AM CDT TUE JUN 17 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN ILLINOIS
  NORTHWEST INDIANA
  SOUTHERN WISCONSIN
  LAKE MICHIGAN

* EFFECTIVE THIS TUESDAY MORNING FROM 410 AM UNTIL 900 AM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75
    MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES WEST NORTHWEST OF
MILWAUKEE WISCONSIN TO 20 MILES SOUTH SOUTHWEST OF MARSEILLES
ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

&&

DISCUSSION...LONG-LIVED ERN IA SQLN HAS TAKEN ON A NNE-SSW
ORIENTATION THAT NOW LIES AT A CONSIDERABLE ANGLE TO 60 KT DEEP
WSWLY FLOW ACROSS REGION PER AREA VWP DATA. GIVEN FACT THAT SQLN
WILL TRAVERSE A SWATH LARGELY UNTOUCHED BY EARLIER MCS NOW OVER LWR
MS...AND PERSISTENT LOW-LVL AIRMASS RECOVERY IN NRN IL/FAR SRN WI
ASSOCIATED WITH MOIST...50 KT SWLY LLJ...SETUP COULD SUPPORT
MAINTENANCE OF THE SQLN WITH AN ATTENDANT RISK FOR DMGG WIND. IN
ADDITION...GIVEN STRENGTH OF LOW-LVL SHEAR AND THE LIKELIHOOD FOR
AUGMENTATION OF SAME ALONG WSW-ENE ORIENTED OUTFLOW BOUNDARY NOW
OVER NRN IL LEFT BY EARLIER MCS...ENVIRONMENT ALSO COULD PROMOTE
DEVELOPMENT OF EMBEDDED LOW-LVL MESOCYCLONES/QLCS TORNADOES /REF MCD
1033/.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 26045.


...CORFIDI

Tornado Watches in Illinois, 2014Tornado Watches in Wisconsin, 2014Tornado Watches in Indiana, 2014Every tornado watch in 2014

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.