Alert archive / North Carolina / Special Weather Statements in 2011

Special Weather Statement, NWS Raleigh, NC

July 8, 2011Davidson County, Forsyth County, Guilford County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jul 8, 2011, 8:40 PM EDT for Davidson County, Forsyth County, Guilford County, North Carolina. It was in force for 80 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: Jul 8, 2011, 8:40 PM EDT (00:40 UTC)
Expired: Jul 8, 2011, 10:00 PM EDT
In force: 80 min
Issued by: NWS Raleigh, NC

Counties Davidson County, NC, Forsyth County, NC, Guilford County, NC

The radar

The Roanoke radar (KFCX), 120 km from the middle of the area, began a volume at 00:42 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 nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.7 hours before the alert went out and 43 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: 884 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Raleigh, NC wrote its last area forecast discussion before this special weather statement went out at Jul 8, 8:34 PM EDT, 6 minutes earlier.

Area forecast discussion, Jul 8, 8:34 PM EDT, 6 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Jul 8, 3:07 PM EDT, 5 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE RALEIGH NC
307 PM EDT FRI JUL 8 2011

NCZ007>011-021>028-038>043-073>078-083>086-088-089-091915-
PERSON-GRANVILLE-VANCE-WARREN-HALIFAX-FORSYTH-GUILFORD-ALAMANCE-
ORANGE-DURHAM-FRANKLIN-NASH-EDGECOMBE-DAVIDSON-RANDOLPH-CHATHAM-WAKE-
JOHNSTON-WILSON-STANLY-MONTGOMERY-MOORE-LEE-HARNETT-WAYNE-ANSON-
RICHMOND-SCOTLAND-HOKE-CUMBERLAND-SAMPSON-
307 PM EDT FRI JUL 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
INTO TONIGHT. AN APPROACHING UPPER LEVEL TROUGH WILL ENCOUNTER A
VERY MOIST AND UNSTABLE AIRMASS IN PLACE ACROSS CENTRAL NORTH
CAROLINA THIS EVENING THROUGH TONIGHT. A FEW STORMS COULD BECOME
SEVERE...WITH A PRIMARY THREAT OF DAMAGING WINDS. ADDITIONALLY...
LOCALLY HEAVY RAINFALL AND ISOLATED FLASH FLOODING WILL BE
POSSIBLE...PRIMARILY AFTER SUNSET THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH THE DAY SATURDAY...
PRIMARILY SOUTH OF HIGHWAY 64. A FEW STORMS COULD BECOME SEVERE...
WITH A MAIN THREAT OF DAMAGING WINDS.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE OR SIGNIFICANT
WEATHER IMMEDIATELY TO THE NATIONAL WEATHER SERVICE.

VINCENT

In the hours before

Special weather statement, Jul 8, 5:09 PM EDT, 3 hours 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
509 PM EDT FRI JUL 8 2011

NCZ021-022-038-082200-
DAVIDSON-FORSYTH-GUILFORD-
509 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS WILL AFFECT DAVIDSON... NORTHEAST FORSYTH...
AND NORTHWEST GUILFORD COUNTIES THROUGH 600 PM...

AT 505 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS OVER THE YADKIN RIVER ACROSS WESTERN DAVIDSON
COUNTY... AND 15 MILES WEST OF HIGH ROCK... MOVING NORTHEAST AT 30
MPH. ANOTHER STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHWEST OF
THE PTI AIRPORT IN GUILFORD COUNTY... MOVING NORTHEAST AT 40 MPH.

SOME LOCATIONS AFFECTED BY THESE STORMS INCLUDE...HIGH ROCK...
LEXINGTON...WELCOME...PTI AIRPORT... SUMMERFIELD...

HAZARDS INCLUDE...
GUSTY WINDS OF 30 TO 40 MPH.
VERY HEAVY RAIN FOR 20 TO 30 MINUTES.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND BLOWING AROUND TRASH CANS...
POTTED PLANTS...LAWN FURNITURE AND OTHER LIGHT OUTDOOR OBJECTS.

&&

LAT...LON 3585 8048 3583 8046 3586 8042 3585 8039
      3589 8042 3589 8037 3595 8038 3626 7981
      3625 7969 3607 7956 3592 7993 3592 8004
      3586 8005 3572 8041 3573 8044 3579 8049
      3580 8047
TIME...MOT...LOC 2103Z 239DEG 28KT 3583 8038

BADGETT

Special weather statement, Jul 8, 5:40 PM EDT, 3 hours before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
540 PM EDT FRI JUL 8 2011

NCZ021-022-038-082230-
DAVIDSON-FORSYTH-GUILFORD-
540 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS WILL AFFECT NORTHERN DAVIDSON... EASTERN
FORSYTH AND GUILFORD COUNTIES THROUGH 630 PM...

AT 535 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS EXTENDING FROM WINSTON-SALEM TO LEXINGTON...  MOVING
NORTHEAST AT 30 MPH. THESE STORMS WILL AFFECT NORTHERN DAVIDSON...
EASTERN FORSYTH... GUILFORD... AND NORTHWEST RANDOLPH COUNTIES. THIS
INCLUDES THOMASVILLE... HIGH POINT... GREENSBORO... ARCHDALE...
LEXINGTON AND FOREST OAKS.

HAZARDS INCLUDE...
GUSTY WINDS OF 40 TO 45 MPH.
VERY HEAVY RAIN FOR 20 TO 30 MINUTES.
FREQUENT LIGHTNING.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND BLOWING AROUND TRASH CANS...
POTTED PLANTS...LAWN FURNITURE AND OTHER LIGHT OUTDOOR OBJECTS.

&&

LAT...LON 3585 8048 3583 8046 3586 8042 3585 8039
      3589 8042 3589 8037 3595 8038 3626 7981
      3625 7969 3607 7956 3592 7993 3592 8004
      3586 8005 3572 8041 3573 8044 3579 8049
      3580 8047
TIME...MOT...LOC 2103Z 239DEG 27KT 3583 8038

BADGETT

Special weather statement, Jul 8, 7:55 PM EDT, 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
755 PM EDT FRI JUL 8 2011

NCZ007-008-022>025-039-040-090045-
ALAMANCE-CHATHAM-DURHAM-GRANVILLE-GUILFORD-ORANGE-PERSON-RANDOLPH-
755 PM EDT FRI JUL 8 2011

...SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN OVER NORTHEAST
RANDOLPH... SOUTHERN ALAMANCE... SOUTHERN ORANGE... AND WESTERN
PERSON COUNTIES...

AT 750 PM EDT...DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS WITH
VERY HEAVY RAIN 5 MILES EAST OF RANDLEMAN... OVER SAXAPAHAW... AND
10 MILES WEST OF ROXBORO... MOVING NORTHEAST AT 30 MPH.

RAINFALL RATES IN EXCESS OF AN INCH IN 20 MINUTES WILL OCCUR WITH
THESE STORMS.

SOME LOCATIONS AFFECTED BY THESE STORMS THROUGH 900 PM...
LIBERTY... MEBANE... EFLAND...
HILLSBOROUGH...SCHLEY...ROUGEMONT...MORIAH...SURL.

HAZARDS INCLUDE...
HEAVY RAINFALL AND MINOR FLOODING.
OCCASIONAL TO FREQUENT LIGHTNING.

THIS STORM WILL PRODUCE HEAVY RAINFALL...WHICH WILL CAUSE MINOR
FLOODING OF LOW LYING AREAS INCLUDING DITCHES...CREEKS...ROADWAYS AND
AREAS OF POOR DRAINAGE. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. MOTORISTS SHOULD ALSO REDUCE DRIVING SPEEDS TO AVOID
HYDROPLANING.

&&

LAT...LON 3631 7870 3573 7935 3572 7987 3625 7921
      3625 7916 3629 7916 3647 7893
TIME...MOT...LOC 2350Z 219DEG 27KT 3603 7917

BADGETT

Special weather statement, Jul 8, 8:31 PM EDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
831 PM EDT FRI JUL 8 2011

NCZ024-025-090130-
DURHAM-ORANGE-
831 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS WILL MOVE ACROSS ORANGE AND DURHAM COUNTIES
THROUGH 930 PM EDT...

AT 829 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER
TEER...OR ABOUT 11 MILES SOUTHWEST OF HILLSBOROUGH...MOVING NORTHEAST
AT 15 MPH.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE
EFLAND...HILLSBOROUGH.... BAHAMA... AND LOCATIONS ALONG I-85 BETWEEN
MILE MARKERS 161 AND 175.

HAZARDS INCLUDE...
GUSTY WINDS OF 40 TO 50 MPH.
DEADLY CLOUD TO GROUND LIGHTNING.
HEAVY RAINFALL AND MINOR FLOODING.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND BLOWING AROUND TRASH CANS...
POTTED PLANTS...LAWN FURNITURE AND OTHER LIGHT OUTDOOR OBJECTS.

THESE STORMS WILL PRODUCE HEAVY RAINFALL...WHICH WILL CAUSE MINOR
FLOODING OF LOW LYING AREAS INCLUDING DITCHES...CREEKS...ROADWAYS AND
AREAS OF POOR DRAINAGE. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. MOTORISTS SHOULD ALSO REDUCE DRIVING SPEEDS TO AVOID
HYDROPLANING.

&&

LAT...LON 3623 7881 3622 7880 3610 7881 3608 7878
      3607 7879 3607 7875 3603 7875 3587 7918
      3588 7925 3591 7926 3605 7927 3624 7891
TIME...MOT...LOC 0029Z 241DEG 14KT 3596 7921

77

Special weather statement, Jul 8, 8:40 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
840 PM EDT FRI JUL 8 2011

NCZ021-022-038-039-090200-
DAVIDSON-FORSYTH-GUILFORD-RANDOLPH-
840 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS PRODUCING HEAVY RAIN WILL MOVE ACROSS
RANDOLPH...GUILFORD...FORSYTH AND DAVIDSON COUNTIES THROUGH 1000 PM
EDT...

AT 837 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS PRODUCING HEAVY RAIN ALONG A LINE EXTENDING FROM
DONNAHA TO 19 MILES WEST OF HIGH ROCK...OR ALONG A LINE EXTENDING
FROM KING TO 8 MILES SOUTHWEST OF SALISBURY...MOVING NORTHEAST AT 25
MPH.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...CLEMMONS...RURAL
HALL...STANLEYVILLE...WINSTON-SALEM...MIDWAY...HIGH ROCK...
GREENSBORO... AND ARCHDALE.

HAZARDS INCLUDE...
GUSTY WINDS OF 30 TO 40 MPH.
DEADLY CLOUD TO GROUND LIGHTNING.
HEAVY RAINFALL AND MINOR FLOODING.

THESE STORMS WILL PRODUCE HEAVY RAINFALL...WHICH WILL CAUSE MINOR
FLOODING OF LOW LYING AREAS INCLUDING DITCHES...CREEKS...ROADWAYS AND
AREAS OF POOR DRAINAGE. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. MOTORISTS SHOULD ALSO REDUCE DRIVING SPEEDS TO AVOID
HYDROPLANING.

&&

LAT...LON 3611 8051 3614 8044 3627 8045 3625 7966
      3575 7972 3558 8022 3568 8034 3572 8033
      3574 8046 3584 8049 3585 8039 3589 8042
      3590 8039 3589 8037 3596 8038 3599 8043
      3601 8042 3606 8047 3604 8050 3608 8052
TIME...MOT...LOC 0037Z 237DEG 22KT 3626 8039 3558 8055

77

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:28 PM EDT	Areal Flood Advisory	RAH	Durham, Orange	52 min
Jul 8, 8:31 PM EDT	Special Weather Statement	RAH	Durham, Orange	59 min
Jul 8, 9:05 PM EDT	Areal Flood Advisory	RAH	Davidson, Forsyth, Guilford, Randolph	3 hr
Jul 8, 9:25 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth	65 min
Jul 8, 9:28 PM EDT	Severe Thunderstorm Warning	RAH	Guilford, Randolph	60 min
Jul 8, 9:33 PM EDT	Flash Flood Warning	RAH	Davidson, Forsyth	3 hr
Jul 8, 9:37 PM EDT	Flash Flood Warning	RAH	Guilford, Randolph	3 hr
Jul 9, 12:19 AM EDT	Flash Flood Warning	RAH	Davidson, Forsyth, Guilford, Randolph	3 hr
Jul 9, 5:16 PM EDT	Special Weather Statement	RAH	Scotland	59 min

Nearby

Special Weather Statements in North Carolina, 2011 Every special weather statement in 2011

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.