Alert archive / Tennessee / Snow Advisories in 2007

Snow Advisory 9, NWS Morristown, TN

December 15, 20077 counties in Tennessee; 5 counties in Virginia

NWS Morristown, TN issued this snow advisory at Dec 15, 2007, 3:48 PM EST for 7 counties in Tennessee; 5 counties in Virginia. It took effect at Dec 16, 2007, 4:00 AM EST. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Dec 15, 2007, 3:48 PM EST (20:48 UTC)
In effect from: Dec 16, 2007, 4:00 AM EST
Expired: Dec 16, 2007, 2:51 PM EST
In force: 11 hr
Issued by: NWS Morristown, TN

Counties Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Sevier County, TN, Unicoi County, TN, City of Bristol, VA, City of Norton, VA, Russell County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 75 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 245 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: 542 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 434 m²/s²
0-3 km storm-relative helicity: 600 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this snow advisory went out at Dec 15, 3:23 PM EST, 25 minutes earlier.

Area forecast discussion, Dec 15, 3:23 PM EST, 25 minutes before

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Hazardous weather outlook, Dec 15, 5:00 AM EST, 10 hours 48 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 15, 3:35 AM EST	Wind Advisory	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more	35 hr

Nearby

Snow Advisories in Tennessee, 2007 Snow Advisories in Virginia, 2007 Every snow advisory in 2007

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.