Tornado Outbreak Possible 5/11/2014

[TropicalAnalystwx13]

NWS Des Moines:

A SIGNIFICANT AND VERY DANGEROUS SEVERE WEATHER OUTBREAK IS LIKELY
LATE THIS AFTERNOON INTO EARLY TONIGHT. AS ADDITIONAL
THUNDERSTORMS DEVELOP DURING THIS TIME THERE IS A SUBSTANTIAL
THREAT OF STRONG AND LONG TRACK TORNADOES...VERY LARGE HAIL...AND
DAMAGING WINDS.

[EF-5bigj]

Well this could be very bad. It seems storms are starting to fire now.

[Bunkertor]

Tornado Watch 142 is 80/50
SAW2
WW 142 TORNADO IA KS MO NE 111920Z - 120300Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
70SSW EAR/KEARNEY NE/ - 35NE SDA/SHENANDOAH IA/
..AVIATION COORDS.. 50NM N/S /46NE HLC - 36E OVR/
HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24030.

LAT...LON 40659950 41979494 40249494 38909950

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.

[EF-5bigj]

That cell in Nebaska looks to be forming a hook echo.

[supercane4867]

That cell in Nebaska looks to be forming a hook echo.

Yet no warning issued

[EF-5bigj]

Yeah it's puzzling.

[Alyono]

possible unwarned tornado near Clay center

[Alyono]

think the NWS office is plugging the ears shouting "LA LA LA LA LA LA LA LA"

[EF-5bigj]

That cell just got more impressive but it took them long enough to warn it.

[Alyono]

finally, it is warned

[EF-5bigj]

It's pretty impressive looking for sure. Should have been warned earlier

[Bunkertor]

Tornado on the ground near Hastings , NE

[Bunkertor]

379
WFUS53 KDVN 112126
TORDVN
IAC111-112200-
/O.NEW.KDVN.TO.W.0012.140511T2126Z-140511T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
426 PM CDT SUN MAY 11 2014

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
LEE COUNTY IN SOUTHEAST IOWA...

* UNTIL 500 PM CDT

* AT 422 PM CDT...A CONFIRMED TORNADO WAS LOCATED NEAR DONNELLSON...
AND MOVING NORTHEAST AT 20 MPH.

HAZARD...DAMAGING TORNADO AND GOLF BALL SIZE HAIL.

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
LIKELY.

* THE TORNADO WILL BE NEAR...
FRANKLIN AROUND 435 PM CDT.
WEST POINT AND FORT MADISON AROUND 450 PM CDT.
DENMARK AROUND 500 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE SAWYER...FORT MADISON
MUNICIPAL ARPT AND SOUTH AUGUSTA.

[WeatherGuesser]

[EF-5bigj]

That is just one nasty, nasty looking storm.

[Bunkertor]

MESOSCALE DISCUSSION 0566
NWS STORM PREDICTION CENTER NORMAN OK
0446 PM CDT SUN MAY 11 2014

AREAS AFFECTED...SE NEB

CONCERNING...TORNADO WATCH 142...

VALID 112146Z - 112315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 142 CONTINUES.

SUMMARY...SIGNIFICANT TORNADO THREAT WITH LEAD SUPERCELLS ALONG WARM
FRONT IN SE NEB...WITH LONG-TRACK/DAMAGING TORNADOES POSSIBLE THE
NEXT FEW HOURS.

DISCUSSION...THE LEAD SUPERCELL NOW ENTERING NW FILLMORE AND YORK
COUNTIES IN SE NEB WILL LIKELY TRACK ALONG THE SURFACE WARM FRONT
FOR THE NEXT FEW HOURS. SURFACE OBSERVATIONS SHOW THE BOUNDARY
LIFTING NWD IN SW IA/SE NEB...SUCH THAT THE SUPERCELL WILL BEGIN TO
ENCOUNTER A MORE FAVORABLE TORNADO ENVIRONMENT ALONG AND IMMEDIATELY
N OF THE WARM FRONT WHERE THE LOW LEVELS CONTINUE TO WARM/MOISTEN.
THE ORIENTATION OF THE WARM FRONT WILL REMAIN LARGELY PARALLEL TO
THE STORM MOTION...WITH THE SUPERCELL EXPECTED TO REMAIN WITHIN A
FAVORABLE ZONE OF ENHANCED LOW-LEVEL SHEAR AND MOISTURE ALONG THE
BOUNDARY FOR SEVERAL HOURS. THIS WILL SUPPORT AN ENHANCED RISK OF
LONG-TRACK/DAMAGING TORNADOES FOR THE NEXT FEW HOURS...POTENTIALLY
REACHING LINCOLN BY 23Z AND OMAHA/AREAS IMMEDIATELY TO THE S AROUND
00Z. THE MAIN UNCERTAINTY WILL BE THE DEGREE OF STORM
INTERACTIONS/INTERFERENCE WITH NEW STORM FORMATION AHEAD OF THE
INITIAL SUPERCELL...AND OTHER STORMS NOT FAR BEHIND.

..THOMPSON.. 05/11/2014


ATTN...WFO...OAX...GID...

[RL3AO]

Re: The unwarned hook echo. Its quite possible they used the fact that probably 20 spotters were on the storm (and probably a few the NWS mets know) that were saying nothing is happening on the ground. Just an idea.

[Cyclenall]

The ongoing monster supercell that is textbook had some crazy radar sigs near the start like this S-shape hook:

think the NWS office is plugging the ears shouting "LA LA LA LA LA LA LA LA"

Exactly.

I don't know if this is from the main supercell that has been ongoing for hours now, but it looks pretty interesting:


There might have been a chaser problem with this incredible storm, blown off the road but no new info on that.

[RL3AO]

I don't know if this is from the main supercell that has been ongoing for hours now, but it looks pretty interesting:
[img]http://i58.tinypic.com/r1a13p.jpg[ /img]

There might have been a chaser problem with this incredible storm, blown off the road but no new info on that.

Wheres that pic from because I'm skeptical its from today. There has been no reports of a large tornado.

[RL3AO]

Cell SW of Omaha. TDS visible on lower right panel.