Thursday, October 28, 2010

Summary of the extratropical storm.(updated)

Added more info and pictures to this write up...Should be the last update....Click on pictures to see full size.
Also noted this storm does not hold the lowest pressure reading in the CONUS as thought...This has been comfirmed by the NCDC.... The lowest pressure reading for the CONUS was set at Canton,NY back in 1913 with a pressure reading of 955.0 MBS or 28.20"... Also this as occurred in March 7.1932 at Block Island RI...... However this low still set reacords in MN and WI....

This storm has gone down in the history books as stated before…. Some interesting facts about this storm. Here at the Weather Center we were talking about this storm since October 15th ,while other forecasting sites were down playing it we remain on top of it…. We knew it had a making of a major storm close to home, and sure enough it did play out that way…. The storm did stay to West in MN this is where the lowest pressure reading did occur. Bigfork MN recorded an all time low pressure reading of 955.2 MBS or 28.21” of mercury…. Superior came in with an all time lowest pressure reading for WI.28.40” of mercury. Here at the office we recorded a pressure reading of 28.38” of mercury…. This history breaking storm not only effected  the upper Midwest it’s effects were felt throughout a large area of CONUS and Canada….
This is a preliminary data from the SPC.... 52 tornadoes were reported the 26th.... There 9 people inj... 2 from WI as a tornado tore through Kenosha County... The NWS rated this an EF1....

Winds became a big problem with this storm… Sustained winds of 30 to 40 MPH and gusts up to 65 MPH… Here at the office we recorded a wind gust of 54.8 MPH.. This caused widespread damage… Many areas had lost power, along with many downed trees and power lines. Here at the office we lost trees in the yard and without power for a fair amount of time, not only once but three times we lost power… Was also damage to buildings throughout my FA…

Lets talk about rainfall…. Here at the office we picked up a total of 2.50 inches of rain. This was common throughout the FA…. Snowfall on the other had many of my Central and Southern areas stayed warm enough for just rain, while part of my central areas did pick up around an ¼ “ of snow…. My Northern areas did see around ½” of snow Wednesday early morning.. The highest amount of snow fell in MN with 9 inches in St. Louis County….

This power house of a storm system did drag in cold air in, here at the office we never made out of the 30s today... Don't worry the cold air won't last long... Details of that tomorrow....

Now time for some pictures….
Picture below shows two areas of low pressure, first one centered over Eastern ND,Northeastern SD into parts of Western MN...The second on is Centered over Eastern NE,Western IA..Both had pressure readings of 982 MBS.

The map below shows both areas of low pressure have joined and bombed out over MN at 956 MBS.


This is the satellite imagery showing how much the of the CONUS was effected by this history breaking storm system. Snow on the backside with severe thunderstorms along the cold front in the OH and TN Valleys.


Here is the SFC map showing the low bombing out over MN..Along with the very strong winds.Closer the isobars the stronger the wind gradient..Also meaning strong winds at the SFC in the case of this map....

This map below shows the times when the two low pressure systems joined forces...Map from the La Crosse NWS......



Below pictures are from just some of the damage that happend..