Alert archive / North Carolina / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 56, NWS Raleigh, NC
NWS Raleigh, NC issued this severe thunderstorm warning at Jul 7, 1999, 4:20 PM EDT for Guilford County, North Carolina. It was in force for 45 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
- Jul 7, 1999, 4:20 PM EDT (20:20 UTC)
- Expired
- Jul 7, 1999, 5:05 PM EDT
- In force
- 45 min
- Issued by
- NWS Raleigh, NC
- Area
- Whole counties
County Guilford County, NC
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 4:50 PM EDT | Thunderstorm Wind 50 | Greensboro, NC | Trees down on Old Battleground Rd and Lake Jeanette Rd |
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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.3 hours before the alert went out and 10 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
- 683 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1339 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
In the hours before
Special weather statement, Jul 7, 11:10 AM EDT, 5 hours 10 minutes before
SEVERE WEATHER OUTLOOK FOR CENTRAL NORTH CAROLINA NATIONAL WEATHER SERVICE RALEIGH NC 1110 AM EDT WED JUL 7 1999 NCZ007>011-021>028-038>041-043-073>076-083-084-072105- ALAMANCE-ANSON-CHATHAM-DAVIDSON-DURHAM-EDGECOMBE-FORSYTH-FRANKLIN- GRANVILLE-GUILFORD-HALIFAX-LEE-MONTGOMERY-MOORE-NASH-ORANGE-PERSON- RANDOLPH-RICHMOND-STANLY-VANCE-WAKE-WARREN-WILSON- INCLUDING DURHAM...WINSTON-SALEM...GREENSBORO...HIGH POINT... ROCKY MOUNT...CHAPEL HILL...RALEIGH ...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE PIEDMONT AND NORTHERN COASTAL PLAIN OF CENTRAL NORTH CAROLINA THIS AFTERNOON... .SKYWARN SPOTTERS... STORM SPOTTER ACTIVATION IS NOT ANTICIPATED SINCE THE SEVERE STORMS SHOULD BE FEW IN NUMBER. HOWEVER SPOTTERS ARE ENCOURAGED TO REPORT THREATENING WEATHER OF ANY KIND TO THE NATIONAL WEATHER SERVICE OR THEIR LOCAL LAW ENFORCEMENT AGENCY. .SYNOPTIC PATTERN... A MODERATELY MOIST AND UNSTABLE AIR MASS OVER THE PIEDMONT OF NORTH CAROLINA WILL SUPPORT SCATTERED THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING. WHILE THE WIND FIELD ALOFT IS WEAK...STORMS THAT DEVELOP A STRONG SUSTAINED UPDRAFT WILL HAVE THE POTENTIAL TO PRODUCE WIND GUSTS AROUND 60 MPH. SUCH WAS THE CASE TUESDAY AFTERNOON WHICH SAW DAMAGING THUNDERSTORM WINDS IN SOUTHERN RANDOLPH COUNTY. .HAZARDOUS WEATHER DETAILS... THE GREATEST THREAT FROM THE STORMS WILL BE DAMAGING WINDS. THE HIGHEST RISK FOR SEVERE THUNDERSTORMS APPEAR BE IN THE NORTHWEST PIEDMONT IN THE VICINITY OF THE TRIAD...AND OVER THE FAR NORTHEAST PIEDMONT INCLUDING SUCH PLACES AS ROXBORO... OXFORD...HENDERSON...AND KERR RESERVOIR. WHILE THUNDERSTORMS MAY ERUPT AT ANYTIME...THE GREATEST POTENTIAL WILL BE THIS AFTERNOON AFTER 1 PM THEN CONTINUING INTO THE EARLY EVENING HOURS. IN ADDITION...THE STORMS WILL PRODUCE FREQUENT CLOUD-TO-GROUND LIGHTNING STRIKES. DUE TO THE LIGHT WINDS ALOFT...THE STORMS WILL ALSO BE SLOW TO MOVE. THIS WIL RESULT IN TORRENTIAL DOWNPOURS...DUMPING A HALF INCH OF RAIN IN A SHORT PERIOD OF TIME. AT THE FIRST SIGN OF IMPENDING THREATENING WEATHER...HEAD INDOORS IMMEDIATELY STAY TUNED TO NOAA WEATHER RADIO FOR ADDITIONAL STATEMENTS OR POSSIBLE WATCHES AND WARNINGS. WSS/MLM
Special weather statement, Jul 7, 11:10 AM EDT, 5 hours 10 minutes before
SEVERE WEATHER OUTLOOK FOR CENTRAL NORTH CAROLINA NATIONAL WEATHER SERVICE RALEIGH NC 1110 AM EDT WED JUL 7 1999 NCZ007>011-021>028-038>041-043-073>076-083-084-072105- ALAMANCE-ANSON-CHATHAM-DAVIDSON-DURHAM-EDGECOMBE-FORSYTH-FRANKLIN- GRANVILLE-GUILFORD-HALIFAX-LEE-MONTGOMERY-MOORE-NASH-ORANGE-PERSON- RANDOLPH-RICHMOND-STANLY-VANCE-WAKE-WARREN-WILSON- INCLUDING DURHAM...WINSTON-SALEM...GREENSBORO...HIGH POINT... ROCKY MOUNT...CHAPEL HILL...RALEIGH ...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE PIEDMONT AND NORTHERN COASTAL PLAIN OF CENTRAL NORTH CAROLINA THIS AFTERNOON... .SKYWARN SPOTTERS... STORM SPOTTER ACTIVATION IS NOT ANTICIPATED SINCE THE SEVERE STORMS SHOULD BE FEW IN NUMBER. HOWEVER SPOTTERS ARE ENCOURAGED TO REPORT THREATENING WEATHER OF ANY KIND TO THE NATIONAL WEATHER SERVICE OR THEIR LOCAL LAW ENFORCEMENT AGENCY. .SYNOPTIC PATTERN... A MODERATELY MOIST AND UNSTABLE AIR MASS OVER THE PIEDMONT OF NORTH CAROLINA WILL SUPPORT SCATTERED THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING. WHILE THE WIND FIELD ALOFT IS WEAK...STORMS THAT DEVELOP A STRONG SUSTAINED UPDRAFT WILL HAVE THE POTENTIAL TO PRODUCE WIND GUSTS AROUND 60 MPH. SUCH WAS THE CASE TUESDAY AFTERNOON WHICH SAW DAMAGING THUNDERSTORM WINDS IN SOUTHERN RANDOLPH COUNTY. .HAZARDOUS WEATHER DETAILS... THE GREATEST THREAT FROM THE STORMS WILL BE DAMAGING WINDS. THE HIGHEST RISK FOR SEVERE THUNDERSTORMS APPEAR BE IN THE NORTHWEST PIEDMONT IN THE VICINITY OF THE TRIAD...AND OVER THE FAR NORTHEAST PIEDMONT INCLUDING SUCH PLACES AS ROXBORO... OXFORD...HENDERSON...AND KERR RESERVOIR. WHILE THUNDERSTORMS MAY ERUPT AT ANYTIME...THE GREATEST POTENTIAL WILL BE THIS AFTERNOON AFTER 1 PM THEN CONTINUING INTO THE EARLY EVENING HOURS. IN ADDITION...THE STORMS WILL PRODUCE FREQUENT CLOUD-TO-GROUND LIGHTNING STRIKES. DUE TO THE LIGHT WINDS ALOFT...THE STORMS WILL ALSO BE SLOW TO MOVE. THIS WIL RESULT IN TORRENTIAL DOWNPOURS...DUMPING A HALF INCH OF RAIN IN A SHORT PERIOD OF TIME. AT THE FIRST SIGN OF IMPENDING THREATENING WEATHER...HEAD INDOORS IMMEDIATELY STAY TUNED TO NOAA WEATHER RADIO FOR ADDITIONAL STATEMENTS OR POSSIBLE WATCHES AND WARNINGS. WSS/MLM
The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 4:35 PM EDT | Flash Flood Warning | RAH | Forsyth, Guilford | 2 hr |
| Jul 7, 4:59 PM EDT | Severe Thunderstorm Warning | RAH | Granville | 46 min |
| Jul 7, 5:25 PM EDT | Severe Thunderstorm Warning | RAH | Orange | 35 min |
Nearby
Severe Thunderstorm Warnings in North Carolina, 1999Every severe thunderstorm warning in 1999
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.