Alert archive / South Carolina / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 15, NWS Greenville-Spartanburg, SC

March 20, 1998York County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Mar 20, 1998, 1:58 PM EST for York County, South Carolina. It was in force for 32 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: Mar 20, 1998, 1:58 PM EST (18:58 UTC)
Expired: Mar 20, 1998, 2:30 PM EST
In force: 32 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Whole counties

County York County, SC

The radar

The Greer radar (KGSP), 95 km from the middle of the area, began a volume at 18:58 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
Mar 20, 2:10 PM EST	Thunderstorm Wind 50	Rock Hill, SC

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

Charleston AFB, SC (KCHS), launched 12:00Z, 7.0 hours before the alert went out and 255 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 5217 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 50 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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 20, 9:23 AM EST, 4 hours 35 minutes earlier.

Area forecast discussion, Mar 20, 9:23 AM EST, 4 hours 35 minutes before

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In the hours before

Local storm report, Mar 20, 10:50 AM EST, 3 hours 8 minutes before

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Special weather statement, Mar 20, 11:42 AM EST, 2 hours 16 minutes before

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Special weather statement, Mar 20, 11:42 AM EST, 2 hours 16 minutes before

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Special weather statement, Mar 20, 1:15 PM EST, 43 minutes before

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Special weather statement, Mar 20, 1:15 PM EST, 43 minutes before

NCZ035-036-037-057-SCZ014-009-NCZ056-068-070-069-071-082-072-202015-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE SPARTANBURG SC
115 PM EST FRI MAR 20 1998

...NEW TORNADO WATCH NUMBER 116 INCLUDES MUCH OF CENTRAL NORTH
CAROLINA...
...STORMS DEVELOPING RAPIDLY IN SOUTH CAROLINA PIEDMONT...

AT 1 PM EST RADAR SHOWED THUNDERSTORMS IN A LINE ALONG AND JUST WEST OF
7IN THE CAROLINAS.  THE STRONGEST STORMS WERE SHOWN WEST OF ROCK HILL AND
CHESTER IN SOUTH CAROLINA.  THESE STORMS HAD STRENGTHENED QUICKLY SINCE
1245 PM.

ALTHOUGH THE TORNADO WATCH HAS EXPIRED IN SOUTH CAROLINA...PEOPLE IN
CHESTER AND YORK COUNTIES SHOULD REMAIN ALERT FOR RAPID DEVELOPMENT OF
SEVERE WEATHER UNTIL AROUND 2 PM.

THE ATMOSPHERE WAS BECOMING MORE UNSTABLE VERY QUICKLY AND RAPID
DEVELOPMENT OF SEVERE WEATHER...INCLUDING THE POSSIBILITY OF
TORNADOES...IS LIKELY THIS AFTERNOON IN PARTS OF THE CAROLINAS
ALONG AND EAST OF I-77.

SPOTTER GROUPS SHOULD REPORT SEVERE WEATHER CONDITIONS THROUGH NORMAL
SKYWARN CHANNELS.

JONES

Special weather statement, Mar 20, 1:15 PM EST, 43 minutes before

NCZ035-036-037-057-SCZ014-009-NCZ056-068-070-069-071-082-072-202015-

SEVERE WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE GREENVILLE SPARTANBURG SC
115 PM EST FRI MAR 20 1998

...NEW TORNADO WATCH NUMBER 116 INCLUDES MUCH OF CENTRAL NORTH
CAROLINA...
...STORMS DEVELOPING RAPIDLY IN SOUTH CAROLINA PIEDMONT...

AT 1 PM EST RADAR SHOWED THUNDERSTORMS IN A LINE ALONG AND JUST WEST OF
I-77 IN THE CAROLINAS.  THE STRONGEST STORMS WERE SHOWN WEST OF ROCK HILL
AND CHESTER IN SOUTH CAROLINA.  THESE STORMS HAD STRENGTHENED QUICKLY
SINCE 1245 PM.

ALTHOUGH THE TORNADO WATCH HAS EXPIRED IN SOUTH CAROLINA...PEOPLE IN
CHESTER AND YORK COUNTIES SHOULD REMAIN ALERT FOR RAPID DEVELOPMENT OF
SEVERE WEATHER UNTIL AROUND 2 PM.

THE ATMOSPHERE WAS BECOMING MORE UNSTABLE VERY QUICKLY AND RAPID
DEVELOPMENT OF SEVERE WEATHER...INCLUDING THE POSSIBILITY OF
TORNADOES...IS LIKELY THIS AFTERNOON IN PARTS OF THE CAROLINAS
ALONG AND EAST OF I-77.

SPOTTER GROUPS SHOULD REPORT SEVERE WEATHER CONDITIONS THROUGH NORMAL
SKYWARN CHANNELS.

JONES
...CORRECTED GARBLE IN FIRST PARAGRAPH...

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 20, 7:50 AM EST	Tornado Warning	GSP	Jackson, Macon	55 min
Mar 20, 8:49 AM EST	Flash Flood Warning	GSP	Jackson	3 hr
Mar 20, 2:04 PM EST	Severe Thunderstorm Warning	GSP	Davie	26 min
Mar 20, 2:17 PM EST	Severe Thunderstorm Warning	GSP	Mecklenburg	28 min
Mar 20, 2:31 PM EST	Tornado Warning	GSP	Mecklenburg	29 min
Mar 20, 2:44 PM EST	Tornado Warning	GSP	Cabarrus	46 min
Mar 20, 6:51 AM EST	Severe Thunderstorm Warning	GSP	Habersham, Rabun	39 min
Mar 20, 7:15 AM EST	Tornado Warning	GSP	Rabun	30 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 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.