Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Morristown, TN

March 15, 2012Blount County, Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 15, 2012, 8:28 AM EDT for Blount County, Sevier County, Tennessee. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 15, 2012, 8:28 AM EDT (12:28 UTC)
Expired: Mar 15, 2012, 9:00 AM EDT
In force: 32 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Blount County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 71 km from the middle of the area, began a volume at 12:30 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.

What was reported inside it

Time	Report	Where	Remark
Mar 15, 8:30 AM EDT	HAIL 0.88	Townsend, TN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 0.5 hours before the alert went out and 256 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: 866 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 8 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.

521 
WUUS54 KMRX 151228
SVRMRX
TNC009-155-151300-
/O.NEW.KMRX.SV.W.0049.120315T1228Z-120315T1300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
828 AM EDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BLOUNT COUNTY IN EAST TENNESSEE...
  SEVIER COUNTY IN EAST TENNESSEE...

* UNTIL 900 AM EDT

* AT 824 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 14 MILES SOUTHEAST OF MARYVILLE...AND MOVING EAST
  AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  WEARS VALLEY AND ELKMONT.

LAT...LON 3555 8399 3575 8383 3570 8345 3560 8345
      3555 8355 3556 8358 3557 8360 3556 8376
      3552 8383 3551 8388
TIME...MOT...LOC 1228Z 292DEG 10KT 3564 8375

$$

17

1 follow-up statement

846 
WWUS54 KMRX 151241
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
841 AM EDT THU MAR 15 2012

TNC009-155-151300-
/O.CON.KMRX.SV.W.0049.000000T0000Z-120315T1300Z/
SEVIER TN-BLOUNT TN-
841 AM EDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM EDT
FOR BLOUNT AND SEVIER COUNTIES...

AT 830 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR TOWNSEND...OR 15 MILES SOUTHEAST
OF MARYVILLE...MOVING EAST AT 10 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  WEARS VALLEY AND ELKMONT.

LAT...LON 3555 8399 3575 8383 3570 8345 3560 8345
      3555 8355 3556 8358 3557 8360 3556 8376
      3552 8383 3551 8388
TIME...MOT...LOC 1242Z 292DEG 10KT 3563 8371

$$

17

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 8:07 AM EDT	Severe Thunderstorm Warning	MRX	Monroe	38 min
Mar 15, 9:49 AM EDT	Areal Flood Advisory	MRX	Blount, Sevier	116 min
Mar 15, 5:06 PM EDT	Severe Thunderstorm Warning	MRX	Marion	24 min
Mar 15, 5:13 PM EDT	Areal Flood Advisory	MRX	Marion	3 hr
Mar 15, 5:16 PM EDT	Areal Flood Advisory	MRX	Campbell	3 hr
Mar 15, 5:31 PM EDT	Severe Thunderstorm Warning	MRX	Campbell	44 min
Mar 15, 6:21 PM EDT	Flash Flood Warning	MRX	Campbell	114 min
Mar 15, 6:49 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	116 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.