Analyzed mean sea level pressure (black) and surface wind barbs from SPC at 03Z on Saturday, May 10, 2008
An east-west surface boundary can be seen in the pressure and wind analysis below.
Analyzed surface temperatures (red/purple), dew points (brown/green), and wind barbs from SPC at 03Z on Saturday, May 10, 2008
A region of convergence can be seen along a surface boundary in the analysis below with dewpoints
in the lower 60s south of the boundary and in the mid to upper 50s north of the boundary.
700 MB heights, temperatures (red/blue), dew points (green), and wind barbs (black) from SPC at 03Z on Saturday, May 10, 2008
A relatively fast westerly flow was analyzed with the flow at around 35 knots across central North Carolina.
The temperatures had cooled to around -3 degrees C at Greensboro.
500 MB heights, temperatures (red), dew points (green), and wind barbs (black) from SPC at 03Z on Saturday, May 10, 2008
The analysis shows a general flow pattern from the west and northwest with the exit region of a 60 knot
jet approaching the Carolinas from the northwest. A cool pocket of temperatures can be
seen across central North Carolina and Virginia where temperatures were -16 degrees C.
Analyzed mid level lapse rates in the 700-500 MB layer (blue, green, orange, and red) from SPC at 03Z on Saturday, May 10, 2008
A lapse rate is the rate of temperature change with height and the image below
is for the layer from the surface to around 9,000 feet. Note the mid level
lapse rates below range in the 7.0 to 8.0 deg C/km range with the greatest
instability across southern portions of central North Carolina.
Analyzed mixed layer convective available potential energy (MLCAPE) (red) and mixed layer based convective inhibition (MLCIN) (blue lines - shaded)
from SPC at 03Z on Saturday, May 10, 2008
The greatest MLCAPE values were around or slightly greater than 500 J/kg across the eastern Sandhills and
southern Coastal Plain at 03Z with MLCAPE values less than 500 J/kg across much of the remainder of
central NC. Increasing amounts of MLCIN were analyzed across central NC, especially just south of the
area where severe weather was observed. This is to be expected with a stabilizing boundary layer. The
01Z MLCAPE analysis shows that the atmosphere was more unstable a few hours earlier.
Analyzed most unstable convective available potential energy (MUCAPE) (red) and lifted parcel level
(dashed black lines and shaded in yellow and green) from SPC at 03Z on Saturday, May 10, 2008
MUCAPE values ranged between 500 to around 1000 J/kg across central North Carolina.
The shading shows that the instability was not surface based but rather on the order of
1000 to 2000 meters above the surface.
Analyzed precipitable water (green) and wind barbs from SPC at 03Z on Saturday, May 10, 2008
Precipitable water values were around 1.1 inches or less across central North Carolina.
NWS Composite Reflectivity Imagery from 03Z on Saturday, May 10, 2008
The composite reflectivity imagery is from the approximate time in which the analysis imagery above is valid.