Alert archive / North Carolina / Mesoscale Discussions in 2014
Mesoscale Discussion 404
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2014, 3:22 PM EDT for 52 counties in North Carolina; 27 counties in Virginia. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2014, 3:22 PM EDT (19:22 UTC)
- Expired
- Apr 25, 2014, 4:45 PM EDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 79 counties
Alamance County, NC, Anson County, NC, Beaufort County, NC, Bertie County, NC, Camden County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Davidson County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Sampson County, NC, Stanly County, NC, Tyrrell County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Brunswick County, VA, Campbell County, VA, Charlotte County, VA, City of Chesapeake, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Dinwiddie County, VA, Greensville County, VA, Halifax County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Pittsylvania County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 20 km from the middle of the area, began a volume at 19:24 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 12:00Z, 7.4 hours before the alert went out and 121 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
- 664 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
616 ACUS11 KWNS 251923 SWOMCD SPC MCD 251922 VAZ000-NCZ000-SCZ000-252045- MESOSCALE DISCUSSION 0404 NWS STORM PREDICTION CENTER NORMAN OK 0222 PM CDT FRI APR 25 2014 AREAS AFFECTED...PORTIONS OF CNTRL/ERN NC AND SRN VA CONCERNING...TORNADO WATCH 91... VALID 251922Z - 252045Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 91 CONTINUES. SUMMARY...THE TORNADO POTENTIAL IS INCREASING ACROSS PARTS OF THE PIEDMONT AND COASTAL PLAIN OF NORTH CAROLINA AND SRN VIRGINIA. DISCUSSION...SFC MESOANALYSIS REVELS A WWD-ADVANCING AGGREGATE OUTFLOW/SEA BREEZE BOUNDARY RUNNING ROUGHLY FROM HALIFAX TO CUMBERLAND COUNTY. AS ONGOING DISCRETE/SEMI-DISCRETE SUPERCELLS EVOLVING OVER THE PIEDMONT SPREAD E INTO THE MOISTER/MODERATELY UNSTABLE ENVIRONMENT EAST OF THIS BOUNDARY...THEY WILL ENCOUNTER RELATIVELY BACKED SFC WINDS TO BOOST EFFECTIVE SRH TO AROUND 200 M2/S2. LOW-LEVEL HELICITY WILL FURTHER INCREASE AS STRONGER DEEP FLOW ARRIVES IN ASSOCIATION WITH AN ACCOMPANYING PV MAX AND LOW-LEVEL FLOW RESPONDS. TRENDS IN RAX VWP DATA ALREADY REFLECT THIS RESPONSE. AS SUCH...THE RISK FOR TORNADOES WILL INCREASE IN THE NEAR-TERM...PARTICULARLY IN ERN NC AND SERN VA. A STRONG TORNADO RISK WILL EXIST. ..COHEN.. 04/25/2014 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...AKQ...MHX...RAH...ILM...RNK...CAE...GSP... LAT...LON 34898083 37217952 37227518 34897662 34898083
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 12:46 PM EDT | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Bladen, Camden, Carteret and 48 more | 2 hr |
| Apr 25, 1:19 PM EDT | Tornado Watch | SPC | Alamance, Anson, Beaufort, Bertie, Camden, Carteret and 51 more | 10 hr |
| Apr 25, 4:45 PM EDT | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Camden, Carteret, Caswell and 47 more | 90 min |
| Apr 25, 7:29 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 24 more | 61 min |
| Apr 25, 2:50 PM EDT | Mesoscale Discussion | SPC | Accomack, Albemarle, Buckingham, Caroline, Culpeper, Cumberland and 25 more | 2 hr |
Nearby
Mesoscale Discussions in North Carolina, 2014Mesoscale Discussions in Virginia, 2014Every mesoscale discussion in 2014
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.