Alert archive / Tennessee / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 430, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 19, 1998, 5:25 PM EDT for Jefferson County, Knox County, Sevier County, Tennessee. It was in force for 65 min. 3 reports 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
- Jul 19, 1998, 5:25 PM EDT (21:25 UTC)
- Expired
- Jul 19, 1998, 6:30 PM EDT
- In force
- 65 min
- Issued by
- NWS Morristown, TN
- Area
- Whole counties
Counties Jefferson County, TN, Knox County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 33 km from the middle of the area, began a volume at 21:26 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 |
|---|---|---|---|
| Jul 19, 5:40 PM EDT | Hail 0.88 | Chestnut Hill, TN | |
| Jul 19, 5:47 PM EDT | Hail 0.88 | Knoxville, TN | |
| Jul 19, 5:55 PM EDT | Thunderstorm Wind | Sevierville, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 19, 2:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.4 hours before the alert went out and 267 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.
- Mixed-layer CAPE
- 2747 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1061 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMRX 192129 SVRMRX TNC089-093-155-192230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN 525 PM EDT SUN JUL 19 1998 THE NATIONAL WEATHER SERVICE IN KNOXVILLE/TRI-CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... JEFFERSON COUNTY IN EASTERN TENNESSEE SOUTHERN KNOX COUNTY IN EASTERN TENNESSEE SEVIER COUNTY IN EASTERN TENNESSEE * UNTIL 630 PM EDT * AT 525 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR DANDRIDGE AND A SEVERE THUNDERSTORM JUST SOUTHEAST OF KNOXVILLE...MOVING SOUTHEAST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MT OLIVE AROUND 530 PM MCMAHAN AROUN^D 540 PM DANDRIDGE AROUND 540 PM DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! PDK/TG
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 Jul 19, 3:06 PM EDT, 2 hours 19 minutes earlier.
Area forecast discussion, Jul 19, 3:06 PM EDT, 2 hours 19 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN 306 PM EDT SUN JUL 19 1998 BNDRY SET UP ACRS ERN KY ERLYR...BETW LO CLDS/CLEARING. THIS HAS BEEN SUFFICIENT TO FIRE A QUASISTNRY LINE OF TSTMS...WHICH WITH DRY AIR ALFT HAVE GREAT POTENTIAL FOR DOWNBURSTS AS THEY COLLAPSE. WINDEX FROM MOD SNDG WAS 86 KTS. ANOTHER THRT FROM THESE STORMS...OWING TO WEAK UPR WINDS PARALLEL TO BNDRY...IS HEAVY RAIN. ALREADY SEEING TRAINING ECHOES AND MORE THAN AN INCH PER HOUR AMTS ON RADAR. GOOD NEWS IS THAT THIS EVENT APRS TO BE CONFINED TO THE NE PART OF CWA...ALBEIT BAD NEWS FOR PARCHED LAWNS. CONVECT SHUD BE DECREASING AFT SUNSET...GIVING WAY TO A WARM HAZY NIGHT. COULD BE MUCH MORE DENSE FG IN TRI AREA THAN ANTIC ERLYR...IF SIGNIF PRECIP FALLS. TOMORROW SHUD BE A HOT ONE...BLV CHA WILL BE NR 100 F FOR A MAX. HWVR...OUTFLOW BNDRYS FROM THIS EVE'S CONVECT CUD FIRE ADDL CONVECT FROM TYS NEWD...COOLING THIS AREA BLO GUID. SMH
The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 4:23 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins, Sullivan | 47 min |
| Jul 19, 5:10 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Sullivan, Washington | 65 min |
| Jul 19, 5:47 PM EDT | Severe Thunderstorm Warning | MRX | Blount | 48 min |
| Jul 19, 6:06 PM EDT | Severe Thunderstorm Warning | MRX | Hamblen | 49 min |
| Jul 19, 6:21 PM EDT | Flash Flood Warning | MRX | McMinn | 2 hr |
| Jul 19, 6:45 PM EDT | Severe Thunderstorm Warning | MRX | Monroe | 35 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 1998Every severe thunderstorm warning in 1998
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.