Alert archive / North Carolina / Mesoscale Discussions in 2017

Mesoscale Discussion 244

March 1, 2017Rabun County, Georgia; 22 counties in North Carolina; 6 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2017, 2:07 PM EST for Rabun County, Georgia; 22 counties in North Carolina; 6 counties in South Carolina. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Mar 1, 2017, 2:07 PM EST (19:07 UTC)
Expired
Mar 1, 2017, 4:00 PM EST
In force
113 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 29 counties

Rabun County, GA, Alexander County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Catawba County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Gaston County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Transylvania County, NC, Yancey County, NC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC

The radar

The Greer radar (KGSP), 34 km from the middle of the area, began a volume at 19:09 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, 7.1 hours before the alert went out and 228 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 12:00Z on 2017-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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 12:00Z on 2017-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 312 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
27 J/kg
Mixed-layer CIN
-165 J/kg
Mixed-layer LCL
878 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
312 m²/s²
0-3 km storm-relative helicity
375 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 1, 11:08 AM ESTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 6 more2 hr
Mar 1, 12:48 PM ESTTornado WatchSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 13 more6 hr
Mar 1, 3:02 PM ESTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens7 hr
Mar 1, 3:11 PM ESTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Fannin and 9 more2 hr
Mar 1, 3:43 PM ESTMesoscale DiscussionSPCBarrow, Butts, Carroll, Clarke, Clayton, Cobb and 28 more3 hr
Mar 1, 4:43 PM ESTSevere Thunderstorm WatchSPCBanks, Barrow, Carroll, Clarke, Clayton, Cobb and 22 more4 hr
Mar 1, 6:54 PM ESTMesoscale DiscussionSPCBanks, Barrow, Butts, Carroll, Clarke, Clayton and 31 more2 hr
Mar 1, 9:44 AM ESTMesoscale DiscussionSPCAlamance, Alleghany, Ashe, Caswell, Forsyth, Granville and 8 more91 min
Mar 1, 10:38 AM ESTSevere Thunderstorm WatchSPCAlleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more4 hr
Mar 1, 12:25 PM ESTMesoscale DiscussionSPCAlleghany, Rockingham, Stokes, Surry65 min
Mar 1, 12:50 PM ESTMesoscale DiscussionSPCGates, Granville, Halifax, Hertford, Northampton, Vance and 1 more55 min
Mar 1, 6:21 PM ESTMesoscale DiscussionSPCAlamance, Anson, Beaufort, Bertie, Bladen, Cabarrus and 40 more114 min

Nearby

Mesoscale Discussions in North Carolina, 2017Mesoscale Discussions in South Carolina, 2017Mesoscale Discussions in Georgia, 2017Every mesoscale discussion in 2017

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.