Alert archive / Tennessee / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 285, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at Aug 20, 1990, 3:59 PM EDT for Hamilton County, Tennessee; Walker County, Georgia. It was in force for 61 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 20, 1990, 3:59 PM EDT (19:59 UTC)
- Expired
- Aug 20, 1990, 5:00 PM EDT
- In force
- 61 min
- Issued by
- NWS Atlanta, GA
- Area
- Whole counties
Counties Walker County, GA, Hamilton County, TN
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 4:15 PM EDT | Thunderstorm Wind 0 | Hamilton, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 8.0 hours before the alert went out and 180 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 202000 SVRCHA GAC295-TNC065-202100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE 359 PM EDT MON AUG 20 1990 THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS IN NORTHWEST GEORGIA ...NORTHERN WALKER COUNTY IN SOUTHEAST TENNESSEE ...SOUTHERN HAMILTON COUNTY AT 357 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE THUNDERSTORM ALMOST DIRECTLY OVER THE DOWNTOWN AREA OF CHATTANOOGA. THE STORM IS MOVING SLOWLY TO THE SOUTH AND WILL MOVE INTO NORTHERN WALKER COUNTY IN GEORGIA SHORTLY. FLOODING MAY BE A PROBLEM TOO AS THIS STORM DUMPS LARGE AMOUNTS OF RAIN. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
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, 2 hours 32 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, 2 hours 29 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, 3:01 PM EDT | Severe Thunderstorm Warning | FFC | Hamilton | 59 min |
| Aug 20, 3:20 PM EDT | Severe Thunderstorm Warning | FFC | Marion | 55 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 1990Severe Thunderstorm Warnings in Georgia, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.