Alert archive / Tennessee / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 283, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at Aug 20, 1990, 3:01 PM EDT for Hamilton County, Tennessee. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1990, 3:01 PM EDT (19:01 UTC)
- Expired
- Aug 20, 1990, 4:00 PM EDT
- In force
- 59 min
- Issued by
- NWS Atlanta, GA
- Area
- Whole counties
County Hamilton County, TN
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 7.0 hours before the alert went out and 167 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
- 1775 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 1373 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 41 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 KCHA 201903 SVRCHA TNC065-202000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE 301 PM EDT MON AUG 20 1990 THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 400 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS IN SOUTHEAST TENNESSEE ...HAMILTON COUNTY AT 300 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE THUNDERSTORM IN NORTHERN HAMILTON COUNTY NEAR THE COMMUNITY OF BIRCHWOOD. THE STORM IS MOVING SLOWLY TO THE SOUTH AND THERE MAY BE SOME MINOR FLOODING DUE TO THE HEAVY RAINFALL. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
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, Aug 20, 1:27 PM EDT, 1 hour 34 minutes before
GAZ006-008-009-202200-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MACON GA
130 PM EDT MON AUG 20 1990
...HEAT INDICES OF 105 TO 110 IN CENTRAL GEORGIA...
AT 130 PM TEMPERATURES IN THE CENTRAL PART OF THE STATE WERE IN
THE MID 90 DEGREE RANGE. THIS TEMPRATURE COMBINED WITH THE RELATIVE
HUMIDITY WAS GIVING A HEAT INDEX OF 105 IN MACON AND 108 IN WARNER
ROBINS. WITH THE TEMPERATURE IN MIDDLE GEORGIA EXPECTED TO CLIMB
TO AROUND 100 DEGREES THIS AFTERNOON BETWEEN 3 AND 5 MPH...THE HEAT
INDEX COULD EVEN GO ABOVE 110.
IF YOU HAVE TO BE OUTSIDE WORKING THIS AFTERNOON...BE EXTREMELY
CAREFUL. TAKE FREQUENT BREAKS...AND DRINK A LOT OF WATER. THESE
CONDITIONS CAN BE VERY DANGEROUS. HEAT EXHUASTION AND SUNSTROKE
ARE POSSIBLE.Special weather statement, Aug 20, 1:30 PM EDT, 1 hour 31 minutes before
GAZ006-008-009-202200-
SPECIAL WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE MACON GA
130 PM EDT MON AUG 20 1990
...HEAT INDICES OF 105 TO 110 IN CENTRAL GEORGIA...
AT 130 PM TEMPERATURES IN THE CENTRAL PART OF THE STATE WERE IN
THE MID 90 DEGREE RANGE. THIS TEMPERATURE COMBINED WITH THE RELATIVE
HUMIDITY WAS GIVING A HEAT INDEX OF 105 IN MACON AND 108 IN WARNER
ROBINS. WITH THE TEMPERATURE IN MIDDLE GEORGIA EXPECTED TO CLIMB
TO AROUND 100 DEGREES THIS AFTERNOON BETWEEN 3 AND 5 PM...THE HEAT
INDEX COULD EVEN GO ABOVE 110.
IF YOU HAVE TO BE OUTSIDE WORKING THIS AFTERNOON...BE EXTREMELY
CAREFUL. TAKE FREQUENT BREAKS...AND DRINK A LOT OF WATER. THESE
CONDITIONS CAN BE VERY DANGEROUS. HEAT EXHUASTION AND SUNSTROKE
ARE POSSIBLE.The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 1:43 PM EDT | Severe Thunderstorm Warning | FFC | Bledsoe | 62 min |
| Aug 20, 3:20 PM EDT | Severe Thunderstorm Warning | FFC | Marion | 55 min |
| Aug 20, 3:59 PM EDT | Severe Thunderstorm Warning | FFC | Hamilton | 61 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 1990Every severe thunderstorm warning in 1990
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.