Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 381
The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2011, 3:23 AM EDT for 25 counties in North Carolina; Carter County, Johnson County, Sullivan County, Tennessee; 11 counties in Virginia. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2011, 3:23 AM EDT (07:23 UTC)
- Expired
- Apr 9, 2011, 4:30 AM EDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 39 counties
Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Guilford County, NC, Iredell County, NC, Lincoln County, NC, Montgomery County, NC, Moore County, NC, Randolph County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Carter County, TN, Johnson County, TN, Sullivan County, TN, Bland County, VA, Carroll County, VA, City of Bristol, VA, City of Galax, VA, Grayson County, VA, Patrick County, VA, Pulaski County, VA, Russell County, VA, Smyth County, VA, Washington County, VA, Wythe County, VA
The radar
The Roanoke radar (KFCX), 110 km from the middle of the area, began a volume at 07:26 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, 7.4 hours before the alert went out and 105 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
- 42 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1618 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
537
ACUS11 KWNS 090723
SWOMCD
SPC MCD 090723
NCZ000-VAZ000-WVZ000-TNZ000-090830-
MESOSCALE DISCUSSION 0381
NWS STORM PREDICTION CENTER NORMAN OK
0223 AM CDT SAT APR 09 2011
AREAS AFFECTED...SW VA...WRN/CNTRL NC
CONCERNING...SEVERE THUNDERSTORM WATCH 110...
VALID 090723Z - 090830Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 110
CONTINUES.
...WIDELY SCATTERED TSTMS PRODUCING MARGINALLY SEVERE HAIL
DIMINISHING...
WNWLY H9-H85 JET AXIS HAS CONTINUED TO WEAKEN AND SHIFT SWD AS WEAK
MID-LEVEL WAVE PASSES BY THE MID-ATLANTIC REGION EARLY THIS MORNING.
GENERATION POINT TO THE ELEVATED UPDRAFTS HAS CONSEQUENTLY SHIFTED
SEWD INTO NERN TN AND WRN/CNTRL NC...BEYOND SEVERE WATCH 110.
INSPECTION OF RUC FORECAST SOUNDINGS SUGGEST THAT MODEST MID-LEVEL
LAPSE RATES OF 6.5-6.8 C PER KM AND WEAK AMOUNTS OF WARM ADVECTION
MAY AID IN BRIEF STORM INTENSIFICATION AND MARGINALLY SEVERE HAIL.
HOWEVER...IT APPEARS THE SVR THREAT IS WANING WITH TIME AND
PROBABILITY FOR NEW WATCHES/EXTENSIONS IS LESS THAN 20 PERCENT.
..RACY.. 04/09/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RAH...RNK...GSP...MRX...
LAT...LON 37378102 36437975 35277910 35197987 35328081 35538165
35898209 36498230 36878250 37108147 37378102SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 9:10 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Chatham, Davidson, Durham, Forsyth and 11 more | 65 min |
| Apr 8, 11:07 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Rockingham, Stokes, Surry, Watauga and 2 more | 6 hr |
| Apr 9, 12:42 AM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Cabarrus and 23 more | 93 min |
| Apr 9, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more | 4 hr |
| Apr 9, 2:00 PM EDT | Tornado Watch | SPC | Alleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more | 7 hr |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Anson, Cabarrus, Catawba, Cleveland, Davie and 7 more | 6 hr |
| Apr 9, 4:21 PM EDT | Mesoscale Discussion | SPC | Ashe, Avery, Buncombe, Burke, Caldwell, Cherokee and 15 more | 84 min |
| Apr 9, 5:36 PM EDT | Mesoscale Discussion | SPC | Cleveland, Gaston, Lincoln, Mecklenburg, Polk, Rutherford and 1 more | 54 min |
| Apr 9, 6:16 PM EDT | Tornado Watch | SPC | Buncombe, Burke, Cleveland, Gaston, Haywood, Henderson and 10 more | 6 hr |
| Apr 9, 7:59 PM EDT | Mesoscale Discussion | SPC | Anson, Buncombe, Burke, Cabarrus, Catawba, Cleveland and 13 more | 61 min |
| Apr 9, 7:41 AM EDT | Mesoscale Discussion | SPC | Clay, Fentress, Jackson, Macon, Montgomery, Overton and 6 more | 2 hr |
| Apr 9, 8:25 AM EDT | Severe Thunderstorm Watch | SPC | Clay, Jackson, Macon, Montgomery, Overton, Pickett and 4 more | 6 hr |
| Apr 9, 12:07 PM EDT | Mesoscale Discussion | SPC | Campbell, Clay, Cumberland, Fentress, Jackson, Morgan and 5 more | 83 min |
Nearby
Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in Tennessee, 2011Every mesoscale discussion in 2011
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.