Alert archive / Tennessee / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 190, NWS Morristown, TN

August 17, 2000Hamblen County, Jefferson County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 17, 2000, 5:45 PM EDT for Hamblen County, Jefferson County, Tennessee. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 17, 2000, 5:45 PM EDT (21:45 UTC)
Expired: Aug 17, 2000, 6:15 PM EDT
In force: 30 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Hamblen County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 6 km from the middle of the area, began a volume at 21:47 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.

What was reported inside it

Time	Report	Where	Remark
Aug 17, 5:55 PM EDT	Hail 0.75	Morristown, TN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.8 hours before the alert went out and 291 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: 2685 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KMRX 172144
SVRMRX
TNC063-089-172215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
545 PM EDT THU AUG 17 2000

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HAMBLEN COUNTY IN EASTERN TENNESSEE
  JEFFERSON COUNTY IN EASTERN TENNESSEE

* UNTIL 615 PM EDT

* AT 543 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM NEAR BUFFALO SPRINGS...OR 10 MILES EAST OF   
  RUTLEDGE...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  JEFFERSON CITY AROUND 605 PM EDT
  ALPHA AROUND 610 PM EDT
  6 MILES NORTHWEST OF WHITE PINE AROUND 615 PM EDT

THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING...
  WINDS UP TO 60 MPH...WHICH COULD PUSH OVER SHALLOW ROOTED TREES AND
  BREAK LIMBS OFF OF TREES ABOUT THE SIZE OF YOUR WRIST.
  HAIL UP TO 1 INCH IN DIAMETER...OR THE SIZE OF QUARTERS.
  VERY HEAVY RAINFALL WHICH MAY CAUSE LOCALIZED FLOODING.

SEEK A STURDY SHELTER IMMEDIATELY!

$$

LAT...LON 3634 8352 3621 8367 3599 8340 3615 8321

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 17, 3:12 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Aug 17, 3:12 PM EDT, 2 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
312 PM EDT THU AUG 17 2000

SURFACE ANALYSIS SHOWING LOW OVER IL WITH A COLD FRONT EXTENDING
ACROSS NORTHERN MO AND A WARM FRONT INTO NORTHERN KY.  MCS OVER OH
SHOULD CONTINUE TO MOVE NORTH OF OUR AREA...BUT DEBRIS CLOUDS
ENTERING NORTHEAST COUNTIES.  EXPECTING ANOTHER MCS TO FORM THIS
EVENING AHEAD OF COLD FRONT AND CLIP NORTHEAST TN AND SOUTHWEST VA.
WILL GO WITH 50 POPS IN THE NORTH WITH DECREASING CHANCE POPS
FURTHER SOUTH.  THINK MOST OF THE COMPLEX WILL STAY NORTH OF OUR
AREA...BUT WITH THE FAIRLY HIGH PWS MOVING IN...COULD SEE SOME HEAVY
RAIN.  THINK SEVERE WEATHER WILL REMAIN NORTH...CLOSER TO THE UPPER
JET.

ALL MODELS PROGGING COLD FRONT THROUGH OUR AREA LATE TOMORROW.
MOISTURE NOT VERY DEEP AHEAD OF THE FRONT...BUT WITH DEW POINTS IN
THE 70S...AND LI'S  OF -2 TO -4...PROBABLY SEE SOME PRETTY STRONG
THUNDERSTORMS IN THE AFTERNOON.  LIFT AIDED BY THE RIGHT ENTRANCE
REGION OF THE UPPER JET.  DEPENDING ON HOW FAR SOUTH THE MCS MAKES IT
TONIGHT...SOME OF OUR NORTHERN COUNTIES MAY NOT RECOVER FROM MORNING
CONVECTION...BUT WILL GO WITH 50 POPS EVERYWHERE FOR TOMORROW.

HIGH PRESSURE PUSHES IN FRIDAY NIGHT AND SATURDAY.  WILL KEEP A
SLIGHT CHANCE POP FOR SOUTHEAST FOR FRIDAY EVENING...THEN DRY
WEATHER THROUGH THE REST OF THE PERIOD.

FWC AND FAN TEMPERATURES CLOSE...DIDN'T STRAY TOO FAR.  LOOKS LIKE
A NICE COOL DOWN FOR THOE WEEKEND.

CHA   72  95  69  90 /  30  50  20   0
TYS   70  91  66  87 /  40  50  10   0
TRI   66  87  61  83 /  50  50  10   0
OQT   70  91  66  87 /  40  50  10   0

.MRX...
NC...NONE.
TN...NONE.
VA...NONE.

GH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 5:11 PM EDT	Severe Thunderstorm Warning	MRX	Grainger	34 min
Aug 17, 7:58 PM EDT	Severe Thunderstorm Warning	MRX	Hancock	32 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2000 Every severe thunderstorm warning in 2000

Sources

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