Severe Weather Season 2012

[toxictwister00]

This crap is supposed to be our big severe weather event? What gives?

[Localonthe8s]

Apparently there's a tornado emergency for the DC area. Storms look real nasty out there.

[WeatherWitness]

I think something is wrong with this SPC map.   It's not that I disagree with a slight risk of severe weather covering a great deal of the country, but the lines and colors are way off.

[Trevor]

Yup. There's a known issue with the SPC map. It's already been corrected. Somebody probably pressed the wrong button.

Someone jokingly commented on that photo on Facebook: "It must have been bring your kid to work day at the SPC!"

[Mr. Rainman]

Minneapolis/St. Paul could face an elevated tornado threat this afternoon and evening - SPC has a 10% chance of tornadoes right over them.

[Mr. Rainman]

Just as I thought SPC couldn't make any smaller of a watch, they issue a watch for a single cell for 5 counties in Indiana. You'd think just a few warnings would do.

The second image is that cell they are tracking. The outflow boundary/gust front on that thing is impressive!

[twcctornado77]

Derecho moving into central WV........ Roughly 2/3rds of WV under a Severe Thunderstorm Warning........


http://www.spc.noaa.gov/products/watch/ww0438.html

Radar mosaic...... HUGE supercells in that derecho....... Echo tops measured 71,000 feet not too long ago.
http://radar.weather.gov/Conus/centgrtlakes_loop.php

[twcctornado77]

All but 5 counties in West Virginia is under a severe thunderstorm warning. Dang.

http://www.spc.noaa.gov/products/watch/ww0438_warnings.gif

[twcctornado77]

Leading edge of the derecho is blasting into Roanoke, VA....... D.C, Charlottesville, VA and Lynchburg, VA will get it over the next 1-2 hours.

http://radar.weather.gov/radar.php?rid=FCX&product=N0R&overlay=11101111&loop=yes

[Mr. Rainman]

600 wind reports as of 11:41 PM CDT and the most severe portion of the derecho has finally pushed offshore. This was an impressive system. 

[phw115wvwx]

The airport at Roanoke, VA measured a wind gust of 81 mph from this derecho.  There are numerous trees down, power lines down, trees on top of mobile homes and vehicles, structures caught on fire due to hanging power lines, and so much more that I can't remember all the calls I received.  I'm stunned that my apartment didn't lose power and that my vehicle was unharmed.  The Blacksburg NWS was forced to use generator power for the radar and the office during this event to keep everything running.  My sounding from this evening had over 3,300 J/kg of CAPE (tons of instability due to the record heat today) and over 1,900 J/kg of DCAPE (energy for downdrafts, hence the very strong winds we experienced).  I sure hope everyone is okay.

[twcctornado77]

The airport at Roanoke, VA measured a wind gust of 81 mph from this derecho.  There are numerous trees down, power lines down, trees on top of mobile homes and vehicles, structures caught on fire due to hanging power lines, and so much more that I can't remember all the calls I received.  I'm stunned that my apartment didn't lose power and that my vehicle was unharmed.  The Blacksburg NWS was forced to use generator power for the radar and the office during this event to keep everything running.  My sounding from this evening had over 3,300 J/kg of CAPE (tons of instability due to the record heat today) and over 1,900 J/kg of DCAPE (energy for downdrafts, hence the very strong winds we experienced).  I sure hope everyone is okay.

Hope y'all's ok. That thing was a beast.........

[Trevor]

We had one very similar move through the Memphis area in 2003. Technically called the "Summer Storm of 2003", most Memphians refer to it as Hurricane Elvis, because it packed winds that of a Category 2 hurricane. Which actually was a coincidence, because the next tropical entity to be named would have been an E.

I remember power being out at my house for 2 and a half weeks. The next few days after the storm, 100 degree temperatures. No A/C for 2/3rds of the city. Hardly no national news coverage. However, soon after, NYCs power went out for an hour and a half, and every national network is breaking in with breaking news. It's like they forget about us down here sometimes...

[TWCmatthew]

The airport at Roanoke, VA measured a wind gust of 81 mph from this derecho.  There are numerous trees down, power lines down, trees on top of mobile homes and vehicles, structures caught on fire due to hanging power lines, and so much more that I can't remember all the calls I received.  I'm stunned that my apartment didn't lose power and that my vehicle was unharmed.  The Blacksburg NWS was forced to use generator power for the radar and the office during this event to keep everything running.  My sounding from this evening had over 3,300 J/kg of CAPE (tons of instability due to the record heat today) and over 1,900 J/kg of DCAPE (energy for downdrafts, hence the very strong winds we experienced).  I sure hope everyone is okay.

Wow, that must've been an experience!
After a high of 100 and a dew point in the low 70's in Monroe on Thursday (low-mid 100's in other southern Michigan locals), a sounding from rucsoundings.com showed >8,000 j/kg of CAPE but a lot of CIN that evening. Nothing fired off due to the cap, but if it would've of, it could of had extremely intense energy to work with, not to mention almost 40 kts of 0-6km shear. The front then slipped just south of me, keeping the instability/shear into Indiana/Ohio yesterday, where the derecho began to intensify. What a close call!

[Localonthe8s]

I believe that same cell that produced the derechos slammed here in the Philadelphia/Atlantic City area. There was an 81mph wind gust reported at our town. I believe it...because that was the worst thunderstorm I have EVER experienced in my 15 years living in the shore.