Alert archive / Tennessee / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 433, NWS Morristown, TN

July 19, 1998Monroe County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 19, 1998, 6:45 PM EDT for Monroe County, Tennessee. It was in force for 35 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: Jul 19, 1998, 6:45 PM EDT (22:45 UTC)
Expired: Jul 19, 1998, 7:20 PM EDT
In force: 35 min
Issued by: NWS Morristown, TN
Area: Whole counties

County Monroe County, TN

The radar

The Knoxville radar (KMRX), 111 km from the middle of the area, began a volume at 22:46 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, 7:20 PM EDT	Thunderstorm Wind	Tellico Plains, 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, 10.8 hours before the alert went out and 225 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: 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

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 3 hours 39 minutes earlier.

Area forecast discussion, Jul 19, 3:06 PM EDT, 3 hours 39 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, 5:25 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson, Knox, Sevier	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, 4:02 PM EDT	Severe Thunderstorm Warning	MRX	Scott	48 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1998 Every 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.