Alert archive / North Carolina / Mesoscale Discussions in 2003
Mesoscale Discussion 2018
The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2003, 7:42 PM EDT for 31 counties in North Carolina; 6 counties in South Carolina. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2003, 7:42 PM EDT (23:42 UTC)
- Expired
- Jul 29, 2003, 9:15 PM EDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 37 counties
Anson County, NC, Beaufort County, NC, Bladen County, NC, Chatham County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Greene County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Montgomery County, NC, Moore County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Kershaw County, SC, Lancaster County, SC, Marlboro County, SC
The radar
The Raleigh/Durham radar (KRAX), 116 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 148 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
- 681 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1045 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
676 ACUS11 KWNS 292343 SWOMCD SPC MCD 292342 NCZ000-SCZ000-300115- MESOSCALE DISCUSSION 2018 NWS STORM PREDICTION CENTER NORMAN OK 0642 PM CDT TUE JUL 29 2003 AREAS AFFECTED...NRN SC...CENTRAL/ERN NC CONCERNING...SEVERE THUNDERSTORM WATCH 812... VALID 292342Z - 300115Z ISOLATED DAMAGING WINDS WILL REMAIN POSSIBLE WHERE CONVECTIVE LINE/INDIVIDUAL STORM MERGERS OCCUR...ESPECIALLY OVER SERN NC/FAR NERN SC. ALTHOUGH THE OVERALL SEVERE THREAT APPEARS TO BE DIMINISHING...THE HEAVY RAIN THREAT WILL REMAIN OVER PORTIONS OF ERN NC ALONG/NORTH OF A STATIONARY BOUNDARY. LATEST IR IMAGERY SHOWS CLOUD TOP WARMING SUGGESTING A WEAKENING TREND IN CONVECTIVE LINE MOVING THROUGH CENTRAL NC. THUS THE ORGANIZED DAMAGING WIND THREAT SHOULD BE MITIGATED OVER WW 812 THROUGH THE REMAINDER OF THE WATCH VALID TIME...30/01Z. THE BEST POTENTIAL FOR SHORT LIVED DOWNBURSTS/DAMAGING WIND THREAT WILL OCCUR OVER OVER SERN NC/NERN SC...WHERE CONVECTIVE LINE/INDIVIDUAL STORM MERGERS WILL LOCALLY ENHANCE UPDRAFT STRENGTH IN AN AIRMASS THAT HAS NOT BEEN PREVIOUSLY CONVECTIVELY CONTAMINATED SOUTH OF A STATIONARY BOUNDARY. INCREASING SWLY LOW LEVEL JET...GENERATED FROM CONVECTIVE COMPLEX...INTO THIS STATIONARY BOUNDARY EXTENDING FORM 30 S OF SOP EWD 25 N OF EWN MAY SHOULD AID IN CONTINUED STRONG CONVECTIVE DEVELOPMENT ALONG AND NORTH OF THE BOUNDARY OVER ERN/NERN NC. WLY MEAN WIND FIELDS SHOULD AID IN SOME ECHO TRAINING/HEAVY RAIN THREAT WITH HOURLY RAINFALL RATES UP TO 2 INCHES FOR THE NEXT 3-4 HOURS. ..CROSBIE.. 07/29/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MHX...RAH...ILM...CAE...GSP... 34278112 35877987 35687658 34167772
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 2:14 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Anson, Buncombe, Burke, Cabarrus and 30 more | 2 hr |
| Jul 29, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Anson, Bladen, Burke, Cabarrus, Caldwell and 31 more | 6 hr |
| Jul 29, 4:51 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Catawba, Chatham, Cleveland and 30 more | 114 min |
Nearby
Mesoscale Discussions in North Carolina, 2003Mesoscale Discussions in South Carolina, 2003Every mesoscale discussion in 2003
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.