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OKpowdah

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PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN

630 PM CST SUN NOV 11 2012

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...

..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....

..REMARKS..

1058 PM TORNADO 1 SW BURNSVILLE 44.75N 93.30W

11/10/2012 F0 DAKOTA MN NWS STORM SURVEY

AN EF0 TORNADO SPUN UP JUST NORTHEAST OF THE INTERSECTION

OF COUNTY ROAD 5 AND MCANDREWS RD AND TRACKED NORTHEAST

TO JUST SOUTHWEST OF THE INTERSECTION OF BURNSVILLE PKWY

AND HWY 11. NUMEROUS TREE AND POWER LINES WERE BLOWN DOWN

ALONG THE PATH...SOME FELL ON HOUSES. A STOP SIGN WAS

BENT ALL THE WAY TO THE GROUND AND A GRILL LID WAS FLOWN

ABOUT 200 YDS NEAR NICOLLET JR HIGH SCHOOL. MAXIMUM WIND

SPEEDS WERE 80 MPH.

1105 PM TORNADO 2 NNW EAGAN 44.85N 93.18W

11/10/2012 F0 DAKOTA MN NWS STORM SURVEY

A BRIEF EF0 TORNADO SPUN UP NEAR SKYLINE DRIVE EAST OF

HWY 13 AND TRACKED NNE TO THE LOST SPUR GOLF COURSE JUST

SOUTH OF I-494. NUMEROUS TREES WERE BLOWN DOWN AND

EXHIBITED A CONVERGENT DAMAGE PATTERN. SOME TREES FELL

ONTO HOUSES AND POWER LINES. OTHERWISE...LITTLE STRUCTUAL

DAMAGE. ESTIMATED WINDS 75 MPH.

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Why did they try to "fix" something that wasn't broken?

Agreed, for example, the 1500 m threshold goes against the findings in Craven and Brooks '04, which suggested that most strong/violent tornadoes occur with MLLCL heights less than 1200 m, and often less than 1000 m, as the old parameters suggested. The median of MLCAPE in significant tornadic events from the article also suggested a majority of significant tornadoes occur with 750-1000 and over J/kg of MLCAPE.

http://www.srh.noaa....arch_climopaper

It was quite a good indicator prior to this change, for example, before April 26/27 last year, the SREF was popping a 50 area over Northern MS at its max timeframe (87 hrs out), which gave a pretty good indication that something extraordinary was about to happen. Multiple other events (4/15/11, 3/2/12, 4/14/12, 4/24/10, 5/24/11, just off the top of my head) with 40-50 prob areas prior to the episode also have verified as tornado outbreaks prior to the change.

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PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN

630 PM CST SUN NOV 11 2012

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...

..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....

..REMARKS..

1058 PM TORNADO 1 SW BURNSVILLE 44.75N 93.30W

11/10/2012 F0 DAKOTA MN NWS STORM SURVEY

AN EF0 TORNADO SPUN UP JUST NORTHEAST OF THE INTERSECTION

OF COUNTY ROAD 5 AND MCANDREWS RD AND TRACKED NORTHEAST

TO JUST SOUTHWEST OF THE INTERSECTION OF BURNSVILLE PKWY

AND HWY 11. NUMEROUS TREE AND POWER LINES WERE BLOWN DOWN

ALONG THE PATH...SOME FELL ON HOUSES. A STOP SIGN WAS

BENT ALL THE WAY TO THE GROUND AND A GRILL LID WAS FLOWN

ABOUT 200 YDS NEAR NICOLLET JR HIGH SCHOOL. MAXIMUM WIND

SPEEDS WERE 80 MPH.

1105 PM TORNADO 2 NNW EAGAN 44.85N 93.18W

11/10/2012 F0 DAKOTA MN NWS STORM SURVEY

A BRIEF EF0 TORNADO SPUN UP NEAR SKYLINE DRIVE EAST OF

HWY 13 AND TRACKED NNE TO THE LOST SPUR GOLF COURSE JUST

SOUTH OF I-494. NUMEROUS TREES WERE BLOWN DOWN AND

EXHIBITED A CONVERGENT DAMAGE PATTERN. SOME TREES FELL

ONTO HOUSES AND POWER LINES. OTHERWISE...LITTLE STRUCTUAL

DAMAGE. ESTIMATED WINDS 75 MPH.

More surveys have been done, the count is now 4 touchdowns.

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