Alert archive / Tennessee / Wind Advisories in 2011

Wind Advisory 18, NWS Morristown, TN

October 20, 20117 counties in Tennessee

NWS Morristown, TN issued this wind advisory at Oct 20, 2011, 2:23 AM EDT for 7 counties in Tennessee. It took effect at Oct 20, 2011, 3:00 AM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Oct 20, 2011, 2:23 AM EDT (06:23 UTC)
In effect from
Oct 20, 2011, 3:00 AM EDT
Expired
Oct 20, 2011, 2:00 PM EDT
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

The radar

The Knoxville radar (KMRX), 53 km from the middle of the area, began a volume at 06:22 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, 6.4 hours before the alert went out and 264 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 00:00Z on 2011-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 571 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 2011-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939587897117136156Sfc1 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
571 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
472 m above ground
0-6 km bulk shear
103 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

854 
WWUS74 KMRX 200623
NPWMRX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MORRISTOWN TN
223 AM EDT THU OCT 20 2011

...WINDY CONDITIONS EXPECTED IN THE MOUNTAINS TODAY...

.A DEEP AREA OF LOW PRESSURE BRINGING WINDY CONDITIONS IN THE
HIGHER ELEVATIONS. SOUTHWEST WINDS WILL INCREASE TO 20 TO 30 MPH
WITH GUSTS UP TO 45 MPH.

TNZ018-041-043-045-047-072-074-201430-
/O.NEW.KMRX.WI.Y.0018.111020T0700Z-111020T1800Z/
JOHNSON-COCKE SMOKY MOUNTAINS-SOUTHEAST GREENE-UNICOI-
SOUTHEAST CARTER-BLOUNT SMOKY MOUNTAINS-SEVIER SMOKY MOUNTAINS-
INCLUDING THE CITIES OF...MOUNTAIN CITY...COSBY...CEDAR CREEK...
ERWIN...ROAN MOUNTAIN...CADES COVE...GATLINBURG
223 AM EDT THU OCT 20 2011

...WIND ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A WIND
ADVISORY...WHICH IS IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON. 

* EVENT...SOUTHWEST WINDS OF 20 TO 30 MPH...WITH HIGHER GUSTS UP TO
  45 MPH.

* TIMING...BEGINNING NOW AND CONTINUING INTO THE AFTERNOON HOURS.

* IMPACTS...WINDS THIS STRONG CAN MAKE DRIVING  DIFFICULT...
  ESPECIALLY FOR HIGH PROFILE VEHICLES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 26 TO 39 MPH AND/OR GUSTS OF
40 TO 57 MPH ARE EXPECTED OR OCCURRING. WINDS THIS STRONG CAN
MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES...
SO USE CAUTION WHEN DRIVING.

&&

$$
1 follow-up statement
063 
WWUS74 KMRX 201624
NPWMRX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MORRISTOWN TN
1224 PM EDT THU OCT 20 2011

...WINDY CONDITIONS EXPECTED IN THE MOUNTAINS TODAY...

.A DEEP AREA OF LOW PRESSURE BRINGING WINDY CONDITIONS IN THE
HIGHER ELEVATIONS. SOUTHWEST WINDS WILL INCREASE TO 20 TO 30 MPH
WITH GUSTS UP TO 45 MPH.

TNZ018-041-043-045-047-072-074-201800-
/O.CON.KMRX.WI.Y.0018.000000T0000Z-111020T1800Z/
JOHNSON-COCKE SMOKY MOUNTAINS-SOUTHEAST GREENE-UNICOI-
SOUTHEAST CARTER-BLOUNT SMOKY MOUNTAINS-SEVIER SMOKY MOUNTAINS-
INCLUDING THE CITIES OF...MOUNTAIN CITY...COSBY...CEDAR CREEK...
ERWIN...ROAN MOUNTAIN...CADES COVE...GATLINBURG
1224 PM EDT THU OCT 20 2011

...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

* EVENT...SOUTHWEST WINDS OF 20 TO 30 MPH...WITH HIGHER GUSTS UP 
  TO 45 MPH. 

* TIMING...BEGINNING NOW AND CONTINUING INTO THE AFTERNOON HOURS.

* IMPACTS...WINDS THIS STRONG CAN MAKE DRIVING DIFFICULT... 
  ESPECIALLY FOR HIGH PROFILE VEHICLES 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 26 TO 39 MPH AND/OR GUSTS OF
40 TO 57 MPH ARE EXPECTED OR OCCURRING. WINDS THIS STRONG CAN
MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES...
SO USE CAUTION WHEN DRIVING.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 20, 3:48 PM EDTFreeze WatchMRXBlount, Carter, Cocke, Greene, Johnson, Monroe and 5 more12 hr
Oct 20, 3:48 PM EDTFreeze WarningMRXBlount, Campbell, Carter, Claiborne, Cocke, Greene and 7 more12 hr

Nearby

Wind Advisories in Tennessee, 2011Every wind advisory 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.