Alert archive / North Carolina / Mesoscale Discussions in 2021

Mesoscale Discussion 587

May 10, 202112 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at May 10, 2021, 8:17 PM EDT for 12 counties in North Carolina. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 10, 2021, 8:17 PM EDT (00:17 UTC)
Expired
May 10, 2021, 9:15 PM EDT
In force
58 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 163

Counties Cabarrus County, NC, Chatham County, NC, Cumberland County, NC, Davidson County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Randolph County, NC, Rowan County, NC, Stanly County, NC

The radar

The Raleigh/Durham radar (KRAX), 123 km from the middle of the area, began a volume at 00:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.3 hours before the alert went out and 77 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 00:00Z on 2021-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 2021-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -143 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
241 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-143 m²/s²
0-3 km storm-relative helicity
-33 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-1.6

Open this sounding in Storm Lab

The text

As transmitted.

625 
ACUS11 KWNS 110017
SWOMCD
SPC MCD 110017 
NCZ000-110115-

Mesoscale Discussion 0587
NWS Storm Prediction Center Norman OK
0717 PM CDT Mon May 10 2021

Areas affected...Portions of central North Carolina

Concerning...Severe Thunderstorm Watch 163...

Valid 110017Z - 110115Z

The severe weather threat for Severe Thunderstorm Watch 163
continues.

SUMMARY...The severe threat has mostly waned across watch 163. An
isolated strong to severe storm remains possible for another hour or
two in western portions of the watch.

DISCUSSION...As the boundary layer cools, storms have weakened
considerably along the front with the only lightning now observed in
the western portion of watch 163. However, even these storms have
weakened in the past hour with this trend expected to continue.
Therefore, the severe threat has lessened considerably across watch
163 with an isolated severe threat remaining for another hour or two
in western portions of the watch.

..Bentley.. 05/11/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...RAH...ILM...GSP...

LAT...LON   35798096 35827978 35677898 35447843 35047839 34857883
            34887930 35057981 35208028 35478087 35708106 35798096

Nearby

Mesoscale Discussions in North Carolina, 2021Every mesoscale discussion in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.