Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 2297

August 28, 2003Madison County, North Carolina; 8 counties in Tennessee; Washington County, City of Bristol, Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2003, 3:59 AM EDT for Madison County, North Carolina; 8 counties in Tennessee; Washington County, City of Bristol, Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 28, 2003, 3:59 AM EDT (07:59 UTC)
Expired: Aug 28, 2003, 6:00 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Madison County, NC, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, City of Bristol, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 65 km from the middle of the area, began a volume at 08:00 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, 8.0 hours before the alert went out and 250 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3411 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1288 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

928 
ACUS11 KWNS 280800
SWOMCD
SPC MCD 280759 
VAZ000-NCZ000-TNZ000-281000-

MESOSCALE DISCUSSION 2297
NWS STORM PREDICTION CENTER NORMAN OK
0259 AM CDT THU AUG 28 2003

AREAS AFFECTED...ERN TN

CONCERNING...SEVERE THUNDERSTORM POTENTIAL...HEAVY RAINFALL 

VALID 280759Z - 281000Z

THE THREAT FOR VERY HEAVY RAIN...ISOLATED STRONG WIND GUSTS AND
MARGINALLY SEVERE HAIL MAY PERSIST ANOTHER COUPLE HOURS. A WW IS NOT
ANTICIPATED DUE TO THE VERY LOCALIZED NATURE OF THE EVENT.


THIS MORNING SCATTERED STORMS CONTINUE DEVELOPING OVER THE HIGHER
TERRAIN OF ERN TN. VWP DATA SHOW THE LOW LEVEL FLOW HAS VEERED TO
NWLY DURING THE PAST COUPLE HOURS. THOUGH THE FLOW IS WEAK...IT IS
LIKELY ENHANCING UPSLOPE COMPONENT. THIS IN CONJUNCTION WITH A WEAK
CAP APPEAR TO BE AT LEAST PARTLY RESPONSIBLE FOR INITIATION OF THE
STORMS. THE ACTIVITY IS DEVELOPING IN A MODERATELY UNSTABLE
ENVIRONMENT WITH KINEMATIC PROFILES SUPPORTIVE OF PULSE STORMS.
ISOLATED WET MICRO BURSTS AND SMALL HAIL WILL REMAIN POSSIBLE WITH
THE STRONGER CORES NEXT COUPLE HOURS. DUE TO THE SLOW MOVEMENT OF
THE STORMS...LOCALLY HEAVY RAIN WILL ALSO BE LIKELY AS ACTIVITY
TRAINS SLOWLY NEWD.

..DIAL.. 08/28/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RNK...GSP...MRX...

35668387 36918211 36758126 35918229

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 1:59 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Chowan, Edgecombe, Franklin, Gates and 18 more	3 hr
Aug 27, 9:19 PM EDT	Mesoscale Discussion	SPC	Accomack, Caroline, Charles City, Chesterfield, Dinwiddie, Essex and 27 more	56 min

Nearby

Mesoscale Discussions in Tennessee, 2003 Mesoscale Discussions in Virginia, 2003 Mesoscale Discussions in North Carolina, 2003 Every 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.