Alert archive / North Carolina / Flash Flood Warnings in 2010

Flash Flood Warning 60, NWS Raleigh, NC

August 24, 2010Johnston County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 24, 2010, 10:13 AM EDT for Johnston County, North Carolina. It was in force for 107 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 24, 2010, 10:13 AM EDT (14:13 UTC)
Expired: Aug 24, 2010, 12:00 PM EDT
In force: 107 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

County Johnston County, NC

The radar

The Raleigh/Durham radar (KRAX), 20 km from the middle of the area, began a volume at 14:17 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 12:00Z, 2.2 hours before the alert went out and 152 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: 357 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 605 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Aug 24, 9:30 AM EDT, 43 minutes earlier.

Area forecast discussion, Aug 24, 9:30 AM EDT, 43 minutes before

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Hazardous weather outlook, Aug 24, 5:03 AM EDT, 5 hours 10 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
503 AM EDT TUE AUG 24 2010

NCZ007>011-021>028-038>043-073>078-083>086-088-089-250900-
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-
503 AM EDT TUE AUG 24 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

SLOW MOVING SHOWERS AND THUNDERSTORMS WILL PRODUCE LOCALLY
EXCESSIVE RAINFALL TODAY AND TONIGHT...WHICH MAY CAUSE MINOR
FLOODING. ISOLATED RAINFALL AMOUNTS BETWEEN 2 AND 3 INCHES MAY
OCCUR.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY RAINFALL IN EXCESS
OF TWO INCHES TO THE NATIONAL WEATHER SERVICE.

In the hours before

Special weather statement, Aug 24, 6:25 AM EDT, 3 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
625 AM EDT TUE AUG 24 2010

NCZ026-241115-
FRANKLIN-
625 AM EDT TUE AUG 24 2010

...SHOWERS AND THUNDERSTORMS PRODUCING HEAVY RAIN WILL MOVE ACROSS
FRANKLIN COUNTY THROUGH 715 AM EDT...

AT 622 AM EDT...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
WITH VERY HEAVY RAIN OVER FRANKLINTON...OR ABOUT 8 MILES WEST OF
LOUISBURG...MOVING SOUTHEAST AT 5 MPH.

SOME LOCATIONS IMPACTED INCLUDE...LOUISBURG... FRANKLINTON...
INGLESIDE... AND YOUNGSVILLE.

HAZARDS INCLUDE...
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 7807 3587 7828 3589 7831 3589 7833
      3592 7836 3593 7839 3597 7842 3602 7855
      3606 7855 3617 7845 3617 7841 3623 7838
      3623 7833
TIME...MOT...LOC 1022Z 308DEG 6KT 3613 7842

77

Special weather statement, Aug 24, 6:35 AM EDT, 3 hours 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
635 AM EDT TUE AUG 24 2010

NCZ041-042-077-241230-
HARNETT-JOHNSTON-WAKE-
635 AM EDT TUE AUG 24 2010

...SHOWERS AND THUNDERSTORMS PRODUCING HEAVY RAIN WILL MOVE ACROSS
EASTERN WAKE...JOHNSTON AND NORTHERN HARNETT COUNTIES THROUGH 830 AM
EDT...

AT 632 AM EDT...DOPPLER RADAR INDICATED AN AREA OF SHOWERS AND
THUNDERSTORMS PRODUCING HEAVY RAINFALL ALONG A LINE EXTENDING FROM
WENDELL TO ANGIER...OR ALONG A LINE EXTENDING FROM 12 MILES EAST OF
RALEIGH TO 6 MILES NORTH OF LILLINGTON...MOVING SOUTHEAST AT 5 MPH.

LOCATIONS IN THE PATH OF THESE SHOWERS AND STORMS INCLUDE...
ANGIER... WENDELL... LILLINGTON... CLAYTON... BUIES CREEK... COATS
CROSSROADS... SMITHFIELD... AND LOCATIONS ALONG I-40 BETWEEN RALEIGH
AND BENSON AND LOCATIONS ALONG I-95 BETWEEN DUNN AND KENLY.

HAZARDS INCLUDE...
HEAVY RAINFALL AND MINOR FLOODING.

THESE SHOWERS AND 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 3554 7809 3527 7850 3531 7854 3525 7861
      3545 7891 3589 7833 3580 7824 3577 7825
      3574 7823 3571 7816 3567 7816 3560 7813
      3558 7807
TIME...MOT...LOC 1028Z 326DEG 5KT 3576 7843 3547 7879

77

Local storm report, Aug 24, 9:29 AM EDT, 44 minutes before

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Local storm report, Aug 24, 9:31 AM EDT, 42 minutes before

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Local storm report, Aug 24, 9:44 AM EDT, 29 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 1:12 AM EDT	Special Weather Statement	RAH	Person	63 min
Aug 24, 3:08 AM EDT	Areal Flood Advisory	RAH	Durham	67 min
Aug 24, 3:14 AM EDT	Areal Flood Advisory	RAH	Edgecombe, Nash, Wilson	90 min
Aug 24, 4:32 AM EDT	Areal Flood Advisory	RAH	Granville, Vance	3 hr
Aug 24, 4:34 AM EDT	Areal Flood Advisory	RAH	Chatham, Wake	3 hr
Aug 24, 6:25 AM EDT	Special Weather Statement	RAH	Franklin	50 min
Aug 24, 6:35 AM EDT	Special Weather Statement	RAH	Johnston	115 min
Aug 24, 6:47 AM EDT	Areal Flood Advisory	RAH	Harnett, Johnston	3 hr
Aug 24, 7:33 AM EDT	Areal Flood Advisory	RAH	Wake	87 min
Aug 24, 8:46 AM EDT	Flash Flood Warning	RAH	Johnston	119 min
Aug 24, 9:04 AM EDT	Areal Flood Advisory	RAH	Wake	86 min
Aug 24, 10:20 AM EDT	Special Weather Statement	RAH	Sampson	85 min
Aug 24, 1:44 PM EDT	Special Weather Statement	RAH	Person	61 min
Aug 24, 2:30 PM EDT	Special Weather Statement	RAH	Granville, Halifax, Vance, Warren	45 min
Aug 24, 3:18 PM EDT	Special Weather Statement	RAH	Durham, Orange	57 min
Aug 24, 5:12 PM EDT	Special Weather Statement	RAH	Johnston	48 min
Aug 24, 5:18 PM EDT	Special Weather Statement	RAH	Davidson, Forsyth, Guilford, Randolph	57 min
Aug 24, 5:52 PM EDT	Areal Flood Advisory	RAH	Johnston	4 hr
Aug 24, 6:34 PM EDT	Areal Flood Advisory	RAH	Wayne	116 min

Nearby

Flash Flood Warnings in North Carolina, 2010 Every flash flood warning in 2010

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.