Alert archive / North Carolina / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 113, NWS Raleigh, NC

September 17, 2004Wake County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Sep 17, 2004, 5:09 PM EDT for Wake County, North Carolina. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 17, 2004, 5:09 PM EDT (21:09 UTC)
Expired: Sep 17, 2004, 5:45 PM EDT
In force: 36 min
Issued by: NWS Raleigh, NC
Area: Counties, with a storm outline in the text

County Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 15 km from the middle of the area, began a volume at 21:09 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 17, 4:35 PM EDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.2 hours before the alert went out and 134 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: 888 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KRAH 172109
SVRRAH
NCC183-172145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
508 PM EDT FRI SEP 17 2004

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL WAKE COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 545 PM EDT

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER KNIGHTDALE...OR ABOUT 10 MILES SOUTHEAST
  OF RALEIGH...MOVING NORTHEAST AT 65 MPH. WINDS IN EXCESS OF 58 MPH
  ARE LIKELY WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  ZEBULON AND WENDELL

A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING
WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
GO INSIDE A STURDY SHELTER. MOVE TO AN INTERIOR ROOM AND STAY AWAY
FROM WINDOWS.

A TORNADO WATCH IS IN EFFECT UNTIL 800 PM EDT FRIDAY EVENING 
FOR CENTRAL NORTH CAROLINA.

LAT...LON 3575 7860 3567 7840 3583 7826 3596 7840

$$

23

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 10:44 AM EDT	Tornado Warning	RAH	Davidson, Forsyth	31 min
Sep 17, 11:03 AM EDT	Tornado Warning	RAH	Guilford	12 min
Sep 17, 12:38 PM EDT	Tornado Warning	RAH	Moore	37 min
Sep 17, 1:09 PM EDT	Tornado Warning	RAH	Chatham	36 min
Sep 17, 1:43 PM EDT	Severe Thunderstorm Warning	RAH	Orange	32 min
Sep 17, 2:14 PM EDT	Severe Thunderstorm Warning	RAH	Person	46 min
Sep 17, 2:50 PM EDT	Tornado Warning	RAH	Durham	25 min
Sep 17, 3:06 PM EDT	Severe Thunderstorm Warning	RAH	Harnett	24 min
Sep 17, 3:29 PM EDT	Severe Thunderstorm Warning	RAH	Wake	46 min
Sep 17, 3:32 PM EDT	Severe Thunderstorm Warning	RAH	Harnett	28 min
Sep 17, 4:00 PM EDT	Severe Thunderstorm Warning	RAH	Granville	45 min
Sep 17, 4:04 PM EDT	Severe Thunderstorm Warning	RAH	Harnett	26 min
Sep 17, 4:47 PM EDT	Severe Thunderstorm Warning	RAH	Johnston	43 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2004 Every severe thunderstorm warning in 2004

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; radar from the NEXRAD Level II archive.