Alert archive / North Carolina / Flash Flood Watches in 2008

Flash Flood Watch 1, NWS Raleigh, NC

June 22, 200811 counties in North Carolina

NWS Raleigh, NC issued this flash flood watch at Jun 22, 2008, 10:22 PM EDT for 11 counties in North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 22, 2008, 10:22 PM EDT (02:22 UTC)
Expired
Jun 23, 2008, 1:14 AM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Flood severity
None

Counties Alamance County, NC, Anson County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Forsyth County, NC, Guilford County, NC, Montgomery County, NC, Orange County, NC, Randolph County, NC, Stanly County, NC

The radar

The Raleigh/Durham radar (KRAX), 112 km from the middle of the area, began a volume at 02:25 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, 2.4 hours before the alert went out and 41 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 00:00Z on 2008-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 960 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 00:00Z on 2008-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 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
960 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1001 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
161 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 22, 10:05 PM EDT, 17 minutes earlier.

Area forecast discussion, Jun 22, 10:05 PM EDT, 17 minutes before
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Hazardous weather outlook, Jun 22, 8:02 PM EDT, 2 hours 20 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
802 PM EDT SUN JUN 22 2008

NCZ007>011-021>028-038>043-073>078-083>086-088-089-230930-
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-
802 PM EDT SUN JUN 22 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...THROUGH TONIGHT.

SCATTERED THUNDERSTORMS WILL GRADUALLY DIMINISH THROUGH 12
MIDNIGHT. THE STORMS WILL BE ACCOMPANIED BY HEAVY DOWNPOURS WHICH
MAY LEAD TO LOCALIZED FLOODING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

ANOTHER ROUND OF SCATTERED THUNDERSTORMS IS EXPECTED MONDAY
AFTERNOON THROUGH LATE MONDAY EVENING. SOME OF THESE STORMS MAY
BECOME SEVERE...WITH A PRIMARY THREAT OF DAMAGING WINDS AND LARGE
HAIL. THE BEST CHANCE FOR SEVERE WEATHER WILL BE ALONG AND EAST OF
HIGHWAY 1...INCLUDING THE TRIANGLE AREA.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE OR
SIGNIFICANT WEATHER ASSOCIATED WITH THESE STORMS THIS EVENING AND
AGAIN ON MONDAY.

In the hours before

Special weather statement, Jun 22, 7:32 PM EDT, 2 hours 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
732 PM EDT SUN JUN 22 2008

NCZ038-073-230030-
DAVIDSON-STANLY-
732 PM EDT SUN JUN 22 2008

...STRONG SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS DAVIDSON AND
STANLY COUNTIES THROUGH 830 PM EDT...

AT 732 PM EDT...DOPPLER RADAR INDICATED A LINE OF SHOWERS AND
THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM HARRISBURG TO
KANNAPOLIS...MOVING EAST AT 30 MPH. THESE THUNDERSTORMS WILL MOVE
EAST ACROSS STANLY AND SOUTHERN DAVIDSON COUNTIES.

THE STRONG THUNDERSTORMS WILL BE NEAR FINGER AROUND 755 PM
EDT...PLYLER...RICHFIELD AND HIGH ROCK AROUND 805 PM EDT...NEW
LONDON AROUND 810 PM EDT...ALBEMARLE AROUND 815 PM EDT...BADIN AND
DENTON AROUND 825 PM EDT.

GUSTY WINDS VERY HEAVY RAIN AND DANGEROUS CLOUD-TO-GROUND LIGHTNING
CAN BE EXPECTED WITH THESE STORMS. VERY HEAVY RAIN WITH RAINFALL
AMOUNTS EXCEEDING ONE INCH DURING THE NEXT HOUR CAN BE EXPECTED IN
THESE AREAS. MOTORISTS SHOULD DRIVE WITH CAUTION TO AVOID
HYDROPLANING.

JO
Special weather statement, Jun 22, 7:55 PM EDT, 2 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
755 PM EDT SUN JUN 22 2008

NCZ023-230100-
ALAMANCE-
755 PM EDT SUN JUN 22 2008

...A STRONG THUNDERSTORM WILL MOVE ACROSS ALAMANCE COUNTY THROUGH 900
PM EDT...

AT 755 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8 MILES
SOUTHWEST OF ELON COLLEGE...OR ABOUT 11 MILES WEST OF BURLINGTON...
MOVING EAST AT 18 MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...ELON COLLEGE...
ALAMANCE...GLEN RAVEN...BURLINGTON...GRAHAM...GRAHAM.

VERY HEAVY RAIN WITH RAINFALL AMOUNTS EXCEEDING ONE INCH DURING THE
NEXT HOUR CAN BE EXPECTED IN THESE AREAS. MOTORISTS SHOULD DRIVE WITH
CAUTION TO AVOID HYDROPLANING.

JO
Special weather statement, Jun 22, 8:15 PM EDT, 2 hours 7 minutes before
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Local storm report, Jun 22, 8:24 PM EDT, 1 hour 58 minutes before
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Local storm report, Jun 22, 9:43 PM EDT, 39 minutes before
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Local storm report, Jun 22, 9:48 PM EDT, 34 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 8:10 PM EDTSevere Thunderstorm WarningRAHAlamance, Guilford50 min
Jun 22, 8:29 PM EDTSevere Thunderstorm WarningRAHStanly51 min
Jun 22, 9:09 PM EDTAreal Flood AdvisoryRAHAlamance96 min
Jun 22, 11:37 PM EDTAreal Flood AdvisoryRAHStanly3 hr
Jun 23, 5:10 PM EDTSevere Thunderstorm WarningRAHAnson, Richmond50 min
Jun 23, 5:29 PM EDTSevere Thunderstorm WarningRAHDavidson, Randolph41 min
Jun 23, 5:46 PM EDTSevere Thunderstorm WarningRAHAlamance, Guilford44 min
Jun 23, 6:11 PM EDTSevere Thunderstorm WarningRAHOrange49 min
Jun 23, 6:11 PM EDTSevere Thunderstorm WarningRAHDavidson64 min
Jun 23, 6:52 PM EDTSevere Thunderstorm WarningRAHDurham38 min

Nearby

Flash Flood Watches in North Carolina, 2008Every flash flood watch in 2008

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.