Tuesday, May 22, 2012

Severe Weather Outlook for the 23rd of May..

severe

Severe Weather Outlook for the 23rd of May..
Temperatures are in the 80s
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_TMPF_2_M_ABOVE_GROUND.png
DEWPOINTS are in the 60s
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_DPTF_2_M_ABOVE_GROUND.png
CAPE 500-3000 depending where you are located:
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_CAPE_SURFACE.png
LIFT INDEX is 0 to -8 depending where you are located..
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_PLI_30_0_MB_ABOVE_GROUND.png
ENERGY HELICITY INDEX is above 1 in locations of Iowa into Nebraska
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_EHI_1000_M.png
This indicates that super cells are possible in that region. HELICITY is low in those general areas at 00z
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_HLCY_1000_M_ABOVE_GROUND_0_M_ABOVE_GROUND.png
However..it increases in the same areas as the EHI above indicates and gets to around 300. This means that there will be a 5% tornado risk in the areas mentioned above..
SHEAR is 40 to 60 knots...
http://www.twisterdata.com/data/models/nam/221/maps/2012/05/23/00/NAM_221_2012052300_F24_SHRM_500_MB.png
So the parameters that are in place do in fact present a severe weather day across the regions that are highlighted with Nebraska into Iowa being on the receiving end of potential for tornadic activity.
The trigger in place will be a cold front which will be moving to the south south east ... As of 6 Z tonight this should be its position..
http://www.hpc.ncep.noaa.gov/basicwx/91fwbgus.gif


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