Alert archive / Tennessee / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 13, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at May 18, 1993, 9:39 PM EDT for Knox County, Loudon County, Tennessee. It was in force for 51 min.
The area
The counties it named.
The facts
- Issued
- May 18, 1993, 9:39 PM EDT (01:39 UTC)
- Expired
- May 18, 1993, 10:30 PM EDT
- In force
- 51 min
- Issued by
- NWS Morristown, TN
- Area
- Whole counties
Counties Knox County, TN, Loudon County, TN
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 1.7 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.
- Mixed-layer CAPE
- 820 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 899 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTYS 190139 RRA SVRTYS TNC093-105-190230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE KNOXVILLE TN 939 PM EDT TUE MAY 18 1993 THE NATIONAL WEATHER SERVICE IN KNOXVILLE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN EAST CENTRAL TENNESSEE ...KNOX COUNTY...LOUDON COUNTY SEVERAL REPORTS HAVE BEEN RECEIVED FROM THE HAM RADIO OPERATOR OF PEA SIZE HAIL IN EASTERN ROANE COUNTY...AND WESTERN KNOX COUNTY NEAR KARNS. MOVEMENT WAS EAST-NORTHEAST AT 25 TO 35 MPH. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
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.
In the hours before
Special weather statement, May 18, 7:21 PM EDT, 2 hours 18 minutes before
TNZ001-002-003-004-008-016-190100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KNOXVILLE TN 720 PM EDT (620 PM CDT) TUE MAY 18 1993 ...TORNADO WATCH NUMBER 276 IS IN EFFECT FOR THE FOLLOWING COUNTIES UNTIL 9 PM EDT...ANDERSON..CAMPBELL..CLAIRBORNE..KNOX..LOUDON.. MORGAN..ROANE..SCOTT..AND UNION... ...SEVERE THUNDERSTORM WATCH NUMBER 278 IS IN EFFECT UNTIL MIDNIGHT FOR THE FOLLOWING COUNTIES...BLOUNT..KNOX..GRAINGER..LOUDON.. SEVIER..JEFFERSON..CLAIBORNE..HAMBLEN..AND MONROE... AT 715 PM EDT WEATHER SERVICE RADAR SHOWED THUNDERSTORMS AND SHOWERS ...SOME WITH SMALL HAIL AND VERY HEAVY RAIN...ALONG THE CUMBERLAND PLATEAU AND EAST TENNESSEE NORTH AND WEST OF A LINE FROM CROSSVILLE TO NEW TAZEWELL. WHEN YOU OBSERVE THREATENING WEATHER MOVE TO A STURDY SHELTER AS FAST POSSIBLE. MOVEMENT OF THE THUNDERSTORMS AND SHOWERS WAS EAST 45 TO 50 MPH. REMAIN ALERT FOR POTENTIAL TORNADOES AND SEVERE THUNDERSTORMS THROUGH THE EVENING. QUICK ACTION SAVES LIVE. THE STRONGEST THUNDERSTORMS WERE OVER NORTHERN CUMBERLAND... SOUTHERN FENTRESS..AND WESTERN MORGAN COUNTIES. STAY TUNED TO NOAA WEATHER RADIO...LOCAL TV...OR YOUR LOCAL RADIO STATION FOR THE LATEST STATEMENTS AND POSSIBLE WARNINGS. 4 HHx9 M 66WWUST D6WWUS D?66WWUSN ?f6WWUSv <#6WWUS (6WWUS $WWUS f6WWUS0 <q`WWUSl 6WWUS $0E( WUUS @ `WWUS 0v6WWUSf l88 WUUS f6WWUS$ <6WWUS WWUS 85X WUUS ,&V6WWUS 6WWUS .6WWUS 6WWUS D KEmOJ*Y6WWUS _6WWUS V1WSCA 2 4|WWUS( iX WUUSr S7`WWUS |d~WWUS 8``WWUS j@a`WWUS xMWWUS @kD( WUUS ]66WWUS uMn6WWUSZ XWOUS j&6WWUS C6WWUS` u9WWUS dlF6WWUS U6WWUS6 sF6WWUS Aw` WUUS vz6WWUS T
Special weather statement, May 18, 7:21 PM EDT, 2 hours 18 minutes before
TNZ001-002-003-004-008-016-190100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KNOXVILLE TN 720 PM EDT (620 PM CDT) TUE MAY 18 1993 ...TORNADO WATCH NUMBER 276 IS IN EFFECT FOR THE FOLLOWING COUNTIES UNTIL 9 PM EDT...ANDERSON..CAMPBELL..CLAIRBORNE..KNOX..LOUDON.. MORGAN..ROANE..SCOTT..AND UNION... ...SEVERE THUNDERSTORM WATCH NUMBER 278 IS IN EFFECT UNTIL MIDNIGHT FOR THE FOLLOWING COUNTIES...BLOUNT..KNOX..GRAINGER..LOUDON.. SEVIER..JEFFERSON..CLAIBORNE..HAMBLEN..AND MONROE... AT 715 PM EDT WEATHER SERVICE RADAR SHOWED THUNDERSTORMS AND SHOWERS ...SOME WITH SMALL HAIL AND VERY HEAVY RAIN...ALONG THE CUMBERLAND PLATEAU AND EAST TENNESSEE NORTH AND WEST OF A LINE FROM CROSSVILLE TO NEW TAZEWELL. WHEN YOU OBSERVE THREATENING WEATHER MOVE TO A STURDY SHELTER AS FAST POSSIBLE. MOVEMENT OF THE THUNDERSTORMS AND SHOWERS WAS EAST 45 TO 50 MPH. REMAIN ALERT FOR POTENTIAL TORNADOES AND SEVERE THUNDERSTORMS THROUGH THE EVENING. QUICK ACTION SAVES LIVE. THE STRONGEST THUNDERSTORMS WERE OVER NORTHERN CUMBERLAND... SOUTHERN FENTRESS..AND WESTERN MORGAN COUNTIES. STAY TUNED TO NOAA WEATHER RADIO...LOCAL TV...OR YOUR LOCAL RADIO STATION FOR THE LATEST STATEMENTS AND POSSIBLE WARNINGS. 4 HHx9 M 66WWUST D6WWUS D?66WWUSN ?f6WWUSv <#6WWUS (6WWUS $WWUS f6WWUS0 <q`WWUSl 6WWUS $0E( WUUS @ `WWUS 0v6WWUSf l88 WUUS f6WWUS$ <6WWUS WWUS 85X WUUS ,&V6WWUS 6WWUS .6WWUS 6WWUS D KEmOJ*Y6WWUS _6WWUS V1WSCA 2 4|WWUS( iX WUUSr S7`WWUS |d~WWUS 8``WWUS j@a`WWUS xMWWUS @kD( WUUS ]66WWUS uMn6WWUSZ XWOUS j&6WWUS C6WWUS` u9WWUS dlF6WWUS U6WWUS6 sF6WWUS Aw` WUUS vz6WWUS T
Special weather statement, May 18, 7:45 PM EDT, 1 hour 54 minutes before
TNZ001-004-016-VAZ015-016-190130- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE BRISTOL N 745 PM EDT TUE MAY 18 1993 ...SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL MIDNIGHT EDT...IN NORTHEAST TENNESSEE...FOR THE FOLLOWING COUNTIES...CARTER ...GREENE...HANCOCK...HAWKINS...JOHNSON...SULLIVAN...WASHINGTON. ...AND FOR SOUTHWEST VIRGINIA FOR THE FOLLOWING COUNTIES...LEE... RUSSELL...SCOTT...WASHINGTON...WISE. AT 730 PM EDT...WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS ...SOME WITH HEAVY RAIN AND STRONG WINDS NEARING THE TRI-CITIES... EXTENDING FROM ROGERSVILLE...TO KINGSPORT...ABINGDON VIRGINIA... AND WYTHEVILLE VIRGINIA. RAINFALL REPORTS OF UP TO 3/4 INCHES IN LESS THAN AN HOUR HAVE BEEN REPORTED BY THIS SYSTEM. THESE THUNDERSTORMS ARE MOVING TO THE SOUTHEAST AT 25 MILES AN HOUR. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS... VERY HEAVY RAIN...DANGEROUS LIGHTNING...AND SMALL HAIL. SECURE LOOSE OBJECTS AND TAKE COVER AT THE FIRST SOUND OF THUNDER OR APPEARENCE OF LIGHTNING. CDC.
Special weather statement, May 18, 8:45 PM EDT, 54 minutes before
TNZ001-004-016-VAZ015-016-190130- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE BRISTOL N 745 PM EDT TUE MAY 18 1993 ...SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL MIDNIGHT EDT...IN NORTHEAST TENNESSEE...FOR THE FOLLOWING COUNTIES...CARTER ...GREENE...HANCOCK...HAWKINS...JOHNSON...SULLIVAN...WASHINGTON. ...AND FOR SOUTHWEST VIRGINIA FOR THE FOLLOWING COUNTIES...LEE... RUSSELL...SCOTT...WASHINGTON...WISE. AT 730 PM EDT...WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS ...SOME WITH HEAVY RAIN AND STRONG WINDS NEARING THE TRI-CITIES... EXTENDING FROM ROGERSVILLE...TO KINGSPORT...ABINGDON VIRGINIA... AND WYTHEVILLE VIRGINIA. RAINFALL REPORTS OF UP TO 3/4 INCHES IN LESS THAN AN HOUR HAVE BEEN REPORTED BY THIS SYSTEM. THESE THUNDERSTORMS ARE MOVING TO THE SOUTHEAST AT 25 MILES AN HOUR. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS... VERY HEAVY RAIN...DANGEROUS LIGHTNING...AND SMALL HAIL. SECURE LOOSE OBJECTS AND TAKE COVER AT THE FIRST SOUND OF THUNDER OR APPEARENCE OF LIGHTNING. CDC.
Special weather statement, May 18, 9:03 PM EDT, 36 minutes before
TNZ001-002-003-004-005-008-016-190300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KNOXVILLE TN 902 PM EDT (802 PM CDT) TUE MAY 18 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT TIL MIDNIGHT... ...TORNADO WATCH IS NO LONGER IN EFFECT... AT 900 PM EDT WEATHER SERVICE RADAR FROM CHATTANOOGA SHOWED A LINE OF THUNDERSTORMS AND SHOWERS FROM JUST OF WEST OF MORRISTOWN TO NEAR PIKEVILLE. THERE HAVE BEEN REPORTS OF PEA SIZE TO DIME SIZE HAIL FROM THE CUMBERLAND PLATEAU TO THE LAKE CITY AREA IN ANDERSON COUNTY. STRONG GUSTY WINDS...HAIL...VERY HEAVY RAIN...AND DEADLY LIGHTNING WILL BE EXPERIENCED WITH THIS LINE OF THUNDERSTORMS AS THEY MOVE THROUGH YOUR AREA. MOVEMENT WAS EAST-NORTHEAST 25 TO 30 MPH. STAY ABREAST OF THE WEATHER SITUATION BY LISTENING TO NOAA WEATHER RADIO...LOCAL TV...OR YOUR LOCAL RADIO STATION. IF A WARNING IS ISSUED FOR YOUR AREA...REMEMBER...QUICK ACTION CAN SAVE LIVES.
Special weather statement, May 18, 9:03 PM EDT, 36 minutes before
TNZ001-002-003-004-005-008-016-190300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KNOXVILLE TN 902 PM EDT (802 PM CDT) TUE MAY 18 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT TIL MIDNIGHT... ...TORNADO WATCH IS NO LONGER IN EFFECT... AT 900 PM EDT WEATHER SERVICE RADAR FROM CHATTANOOGA SHOWED A LINE OF THUNDERSTORMS AND SHOWERS FROM JUST OF WEST OF MORRISTOWN TO NEAR PIKEVILLE. THERE HAVE BEEN REPORTS OF PEA SIZE TO DIME SIZE HAIL FROM THE CUMBERLAND PLATEAU TO THE LAKE CITY AREA IN ANDERSON COUNTY. STRONG GUSTY WINDS...HAIL...VERY HEAVY RAIN...AND DEADLY LIGHTNING WILL BE EXPERIENCED WITH THIS LINE OF THUNDERSTORMS AS THEY MOVE THROUGH YOUR AREA. MOVEMENT WAS EAST-NORTHEAST 25 TO 30 MPH. STAY ABREAST OF THE WEATHER SITUATION BY LISTENING TO NOAA WEATHER RADIO...LOCAL TV...OR YOUR LOCAL RADIO STATION. IF A WARNING IS ISSUED FOR YOUR AREA...REMEMBER...QUICK ACTION CAN SAVE LIVES.
The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 9:10 PM EDT | Severe Thunderstorm Warning | MRX | Roane | 50 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 1993Every severe thunderstorm warning in 1993
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.