Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 670

April 22, 20054 counties in Tennessee; Scott County, City of Bristol, Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 11:18 PM EDT for 4 counties in Tennessee; Scott County, City of Bristol, Virginia. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2005, 11:18 PM EDT (03:18 UTC)
Expired: Apr 23, 2005, 12:15 AM EDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Greene County, TN, Hawkins County, TN, Sullivan County, TN, Washington County, TN, City of Bristol, VA, Scott County, VA

The radar

The Knoxville radar (KMRX), 83 km from the middle of the area, began a volume at 03:18 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

Roanoke, VA (KRNK), launched 00:00Z, 3.3 hours before the alert went out and 283 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 220 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.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 22, 8:59 PM EDT	Mesoscale Discussion	SPC	Carter, Greene, Hawkins, Sullivan, Washington	31 min
Apr 22, 9:05 PM EDT	Severe Thunderstorm Watch	SPC	Carter, Claiborne, Cocke, Grainger, Greene, Hamblen and 7 more	4 hr
Apr 23, 12:35 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Appomattox, Arlington, Buckingham, Caroline and 39 more	115 min
Apr 23, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	Albemarle, Amelia, Arlington, Brunswick, Buckingham, Caroline and 56 more	7 hr
Apr 23, 3:17 PM EDT	Mesoscale Discussion	SPC	Amelia, Arlington, Brunswick, Caroline, Charles City, Chesterfield and 56 more	88 min
Apr 23, 4:26 PM EDT	Mesoscale Discussion	SPC	Accomack, Gloucester, Isle of Wight, Lancaster, Mathews, Middlesex and 12 more	94 min
Apr 23, 7:16 PM EDT	Mesoscale Discussion	SPC	Accomack, Gloucester, Isle of Wight, James City, Lancaster, Mathews and 16 more	59 min

Nearby

Mesoscale Discussions in Tennessee, 2005 Mesoscale Discussions in Virginia, 2005 Every mesoscale discussion in 2005

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.