Alert archive / North Carolina / Mesoscale Discussions in 2021
Mesoscale Discussion 283
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2021, 4:49 PM EDT for 25 counties in North Carolina; Halifax County, Mecklenburg County, Virginia. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2021, 4:49 PM EDT (20:49 UTC)
- Expired
- Mar 27, 2021, 5:45 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 58
All 27 counties
Alamance County, NC, Caswell County, NC, Chatham County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Stanly County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Halifax County, VA, Mecklenburg County, VA
The radar
The Raleigh/Durham radar (KRAX), 41 km from the middle of the area, began a volume at 20:53 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.8 hours before the alert went out and 128 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2434 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
243
ACUS11 KWNS 272049
SWOMCD
SPC MCD 272049
NCZ000-VAZ000-272145-
Mesoscale Discussion 0283
NWS Storm Prediction Center Norman OK
0349 PM CDT Sat Mar 27 2021
Areas affected...Central/eastern North Carolina and southern
Virginia
Concerning...Severe Thunderstorm Watch 58...
Valid 272049Z - 272145Z
The severe weather threat for Severe Thunderstorm Watch 58
continues.
SUMMARY...Ongoing severe storms will continue to pose a risk for
severe winds and hail over the next couple of hours.
DISCUSSION...Recent radar imagery and storm reports show
strong/severe storms have continued to produce severe weather
throughout WW58 over the last few hours. A few storms (including a
supercell in Moore County, NC) have developed ahead of the main band
of convection indicating the environment remains unstable and
uninhibited. Additional storms may develop within the warm sector
over the next few hours with a risk for damaging wind gusts and
hail.
Farther north into southern Virginia, storms have generally
struggled due to a lack of buoyancy within the cooler and drier
airmass to the north of a quasi stationary front. Severe weather
will remain possible with the strongest cells mainly in the form of
marginally severe hail, though the greatest severe weather risk
across WW58 likely will remain cross North Carolina. A small
downstream watch may be necessary as storms approach the eastern
edge of the watch over the next 2 to 3 hours.
..Lyons.. 03/27/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AKQ...MHX...RAH...RNK...GSP...
LAT...LON 36747815 36467757 36097740 35457740 35157779 35207801
35318030 35898000 36597939 36787911 36747815SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 1:39 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Anson, Burke, Cabarrus, Caldwell and 42 more | 66 min |
| Mar 27, 2:03 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alexander, Alleghany, Burke, Cabarrus, Caldwell and 35 more | 6 hr |
| Mar 27, 5:29 PM EDT | Severe Thunderstorm Watch | SPC | Anson, Beaufort, Craven, Cumberland, Duplin, Greene and 13 more | 5 hr |
| Mar 27, 7:53 PM EDT | Mesoscale Discussion | SPC | Beaufort, Carteret, Craven, Duplin, Greene, Hyde and 7 more | 97 min |
| Mar 27, 11:00 AM EDT | Mesoscale Discussion | SPC | Lee, Scott, City of Bristol, City of Norton | 90 min |
Nearby
Mesoscale Discussions in North Carolina, 2021Mesoscale Discussions in Virginia, 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.