Alert archive / North Carolina / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 20, NWS Raleigh, NC

May 1, 1990Chatham County, Durham County, Orange County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at May 1, 1990, 7:43 PM EDT for Chatham County, Durham County, Orange County, North Carolina. It was in force for 37 min. 2 reports 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
May 1, 1990, 7:43 PM EDT (23:43 UTC)
Expired
May 1, 1990, 8:20 PM EDT
In force
37 min
Issued by
NWS Raleigh, NC
Area
Whole counties

Counties Chatham County, NC, Durham County, NC, Orange County, NC

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

TimeReportWhereRemark
May 1, 8:00 PM EDTThunderstorm Wind 0Chatham, NC
May 1, 8:00 PM EDTThunderstorm Wind 0Durham, NC

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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 11.7 hours before the alert went out and 75 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 1990-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 564 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 1990-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
564 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1024 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KRDU 012345
SVRRDU
NCC037-063-135-020030-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
743 PM EDT TUE MAY 1 1990
 
THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  830 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL NORTH CAROLINA
 
   ...EASTERN CHATHAM COUNTY...SOUTHERN DURHAM COUNTY
   ...SOUTHEASTERN ORANGE COUNTY
 
AT 740 PM EDT WEATHER RADAR SHOWED A SEVERE THUNDERSTORM EXTENDING
FROM JUST WEST OF THE CITY OF DURHAM THROUGH CHAPEL HILL TO JUST NORTH
OF PITTSBORO. AT 740 PM ORANGE COUNTY EMERGENCY DISPATCHERS RELAYED
REPORTS OF TREES DOWN JUST NORTH OF CHAPEL HILL AND POWER LINES DOWN
IN CHAPEL HILL.
 
SEVERE THUNDERSTORM WINDS CAN REACH SPEEDS OF 60 MPH TO OVER 100
MPH. THESE WINDS BLOW DOWN TREES...POWER LINES...AND SEVERELY
DAMAGE MOBILE HOMES...SOMETIMES BUILDINGS. VERY LARGE HAIL CAN
INJURE ANYONE CAUGHT OUTSIgDE.

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 1, 3:57 PM EDT, 3 hours 46 minutes before
NCZ006-007-009-012200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENSBORO NC
350 PM EDT TUE MAY 1 1990

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9 PM EDT FOR THE NORTHERN
   FOOTHILLS AND NORTHERN MOUNTAINS OF NC...

AT 345 PM NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS WITH
HEAVY RAIN JUST TO THE WEST OF PILOT MOUNTAIN OF SURRY COUNTY...EXTREME
WESTERN WILKES COUNTY AND ACROSS THE VIRGINIA BORDER TO THE SOUTHWEST
OF STUART VIRGINIA. THE STORM WITH THE HEAVIEST RAIN WAS TO THE WEST
OF PILOT MOUNTAIN. OTHER THUNDERSTORMS...SOME WITH VERY HEAVY RAIN...WAS
STILL IN NORTHEAST TENNESSEE AND EXTREME SOUTHWEST VIRGINIA. MOVEMENT
WAS TO THE EAST AT 30 MILES AN HOUR.

PERSONS IN THE NORTHERN FOOTHILL COUNTIES OF SURRY AND WILKES AND STOKES
COUNTY OF THE NORTHWEST PIEDMONT SHOULD BE ON THE LOOKOUT FOR VERY HEAVY
DOWNPOURS...DANGEROUS LIGHTNING AND STRONG GUSTY WINDS AND TAKE SHELTER
WHEN THEY APPROACH.

GR
Special weather statement, May 1, 5:09 PM EDT, 2 hours 34 minutes before
NCZ006-007-009-012200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENSBORO NC
509 PM EDT TUE MAY 1 1990

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9 PM EDT FOR THE NORTHERN
   FOOTHILLS AND NORTHERN MOUNTAINS OF NC...

AT 500 PM NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS WITH
HEAVY RAIN ALONG THE NORTH CAROLINA VIRGINA BORDER IN THE NORTHEAST
CORNER OF SURRY AND STOKES COUNTIES OF NORTH COROLINA.  THESE STORMS
COULD PRODUCE SOME WITH VERY HEAVY RAIN AND GUSTY WINDS.

PERSONS IN THE NORTHERN FOOTHILL COUNTIES OF SURRY AND WILKES AND STOKES
COUNTY OF THE NORTHWEST PIEDMONT SHOULD BE ON THE LOOKOUT FOR VERY HEAVY
DOWNPOURS...DANGEROUS LIGHTNING AND STRONG GUSTY WINDS ANDm TAKE SHELTER
WHEN THEY APPROACH.
DH
Special weather statement, May 1, 6:51 PM EDT, 52 minutes before
NCZALL-012355-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH/DURHAM, NC
650 PM EDT TUE MAY 1 1990

...SEVERE THUNDERSTORM WATCHES IN EFFECT THIS EVENING FOR MOST OF
CENTRAL AND WESTERN NORTH CAROLINA...

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR
CENTRAL NORTH CAROLINA INCLUDING THE NORTHERN COASTAL PLAIN.. THE
NORTHEAST PIEDMONT.. THE SANDHILLS.. AND JOHNSTON COUNTY OF THE CENTRAL
COASTAL PLAIN.  ANOTHER SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT
UNTIL 900 PM EDT THIS EVENING FOR THE MOUNTAINS AND NORTHERN FOOTHILLS
OF NORTH CAROLINA.

AT 645 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED NUMEROUS
THUNDERSTORMS OVER THE NORTHWEST PIEDMONT AND ORANGE AND PERSON COUNTIES
IN THE NORTHEAST PIEDMON. THESE STORMS WERE MOVING EAST AT 35 MPH. A
SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR ROCKINGHAM AND GUILFORD
COUNTIES FOR SEVERE THUNDERSTORMS IN THOSE COUNTIES. LARGE HAIL HAS BEEN
REPORTED WITH THESE STORMS...SOME AS LARGE AS BASEBALLS IN EASTERN
EASTERN TENNESSE AND GOLFBALLS IN RUTHERFORD COUNTY NORTH CAROLINA
EARLIER THIS AFTERNOON. TREES HAVE BEEN REPORTED DOWNED IN A CHEROKEE
AND GRAHAM COUNTIES IN THE NORTH CAROLINA MOUNTAINS.

THIS SEVERE WEATHER EPISODE IS STILL A DEVELOPING ONE FOR MOST OF
WESTERN AND CENTRAL NORTH CAROLINA. THUNDERSTORMS WILL CONTINUE TO
MOVE EAST AT 35 MPH THROUGH THE PIEDMONT INTO CENTRAL NORTH CAROLINA.
OTHER THUNDERSTORM CELLS MAY ALSO DEVELOP OVER THE COASTAL
PLAIN AND SANDHILLS.  THUNDERSTORMS WILL BE MOVING INTO THE TRIANGLE
AREA BETWEEN NOW AND 8 O'CLOCK THIS EVENING.

ANY OF THE THUNDERSTORMS THAT DEVELOP MAY CAUSE LARGE HAIL AND
DAMAGING WINDS.  LISTEN TO LOCAL RADIO..TV..OR WEATHER RADIO FOR
LATER STATEMENTS OR POSSIBLE WARNINGS.

HLW
Special weather statement, May 1, 7:15 PM EDT, 28 minutes before
NCZALL-020100-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE RALEIGH/DURHAM, NC
700 PM EDT TUE MAY 1 1990

...SEVERE THUNDERSTORM WATCHES IN EFFECT THIS EVENING FOR MOST OF
CENTRAL AND WESTERN NORTH CAROLINA...

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR WESTERN
AND CENTRAL NORTH CAROLINA INCLUDING THE FOOTHILLS..THE PIEDMONT..
..THE SANDHILLS.. THE NORTHERN COASTAL PLAIN.. AND JOHNSTON COUNTY OF
THE CENTRAL COASTAL PLAIN.  ANOTHER SEVERE THUNDERSTORM WATCH REMAINS
IN EFFECT TIL 900 PM EDT THIS EVENING FOR THE MOUNTAINS.

AT 645 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED NUMEROUS
THUNDERSTORMS OVER THE NORTHWEST PIEDMONT AND ORANGE AND PERSON COUNTIES
IN THE NORTHEAST PIEDMONT. THESE STORMS WERE MOVING EAST AT 35 MPH.

^
EARLIER THIS AFTERNOON...WIND DAMAGE AND LARGE HAIL WAS REPORTED
WITH SEVERE STORMS...HAIL AS LARGE AS BASEBALLS IN EASTERN
TENNESSE AND GOLFBALLS IN RUTHERFORD COUNTY NORTH CAROLINA.
TREES HAVE BEEN REPORTED DOWNED IN CHEROKEE AND GRAHAM COUNTIES
IN THE NORTH CAROLINA MOUNTAINS.

THIS SEVERE WEATHER EPISODE IS STILL A DEVELOPING ONE FOR MOST OF
WESTERN AND CENTRAL NORTH CAROLINA. THUNDERSTORMS WILL CONTINUE TO
MOVE EAST AT 35 MPH THROUGH THE PIEDMONT INTO CENTRAL NORTH CAROLINA.
OTHER THUNDERSTORM CELLS MAY ALSO DEVELOP OVER THE COASTAL
PLAIN AND SANDHILLS. THUNDERSTORMS WILL BE MOVING INTO THE TRIANGLE
AREA BETWEEN 7 AND 8 O'CLOCK THIS EVENING.

ANY OF THE THUNDERSTORMS THAT DEVELOP MAY CAUSE LARGE HAIL AND
DAMAGING WINDS.  LISTEN TO LOCAL RADIO..TV..OR WEATHER RADIO FOR
LATER STATEMENTS OR POSSIBLE WARNINGS.

KK
CORRECTED TO REDEFINE LOCATION AND EXPIRATION TIMES OF THE TWO
SEVERE THUNDERSTORM WA*TCHES IN EFFECT FOR NORTH CAROLINA.
Local storm report, May 1, 7:27 PM EDT, 16 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH/DURHAM, NC
725 PM EDT TUE MAY 01 1990

TIME           EVENT
 710 PM EDT    TREES DOWN 3-4 MILES EAST OF BURLINGTON IN ALAMANCE
               COUNTY, NC.  REPOGRTED BY AMATEUR RADIO OPERATOR.

RFG
Special weather statement, May 1, 7:36 PM EDT, 7 minutes before
NCZ005-020100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH/DURHAM, NC
730 PM EDT TUE MAY 1 1990

...STRONG THUNDERSTORMS MOVING INTO THE NORTHEAST PIEDMONT...

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR THE
NORTHEAST PIEDMONT AND MOST OTHER PORTIONS OF CENTRAL NORTH CAROLINA.
WEATHER RADAR AT 725 PM EDT SHOWED STRONG THUNDERSTORMS MOVING
SOUTHEAST AT 30 TO 35 MPH ACROSS CENTRAL DURHAM AND ORANGE COUNTIES
AND EXTREME NORTHWEST CHATHAM COUNTIES.  THESE STORMS HAVE HAD A
HISTORY OF HIGH WIND AND HAIL AS THEY HAVE COME ACROSS THE NORTHERN
PIEDMONT REGION.

AT THEIR CURRENT RATE OF MOVEMENT THESE THUNDERSTORMS WILL BE CROSSING
THE TRIANGLE AREA DURING THE TIME U_NTIL 9 PM.

LISTEN TO LOCAL RADIO..TV..OR WEATHER RADIO FOR LATER STATEMENTS OR
POSSIBLE WARNINGS.

RFG

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 9:51 PM EDTSevere Thunderstorm WarningRAHScotland54 min
May 1, 7:52 PM EDTSevere Thunderstorm WarningRAHWake68 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 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.