Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 2, NWS Raleigh, NC

May 21, 2016Guilford County, North Carolina

NWS Raleigh, NC issued this flash flood warning at May 21, 2016, 5:03 PM EDT for Guilford County, North Carolina. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 21, 2016, 5:03 PM EDT (21:03 UTC)
Expired
May 21, 2016, 8:00 PM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Guilford County, NC

The radar

The Roanoke radar (KFCX), 113 km from the middle of the area, began a volume at 21:06 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.

What was reported inside it

TimeReportWhereRemark
May 21, 5:12 PM EDTFLASH FLOOD2 Se Greensboro, NCADDITIONAL CONFIRMED FLASH FLOODING BY GREENSBORO POLICE AT S EUGENE AND W WHITTINGTON ST.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.1 hours before the alert went out and 15 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 12:00Z on 2016-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2016-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
636 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
-5 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

741 
WGUS52 KRAH 212103
FFWRAH
NCC081-220000-
/O.NEW.KRAH.FF.W.0002.160521T2103Z-160522T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
503 PM EDT SAT MAY 21 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GUILFORD COUNTY IN CENTRAL NORTH CAROLINA...

* UNTIL 800 PM EDT
  
* AT 500 PM EDT...THUNDERSTORMS PRODUCING HEAVY RAIN ARE MOVING
  ACROSS THE WARNED AREA. EMERGENCY MANAGEMENT OFFICIALS REPORTED
  HIGH WATER ON US 29 AND MARKET STREET. OVER ONE INCH OF RAIN HAS
  ALREADY FALLEN IN THIS AREA AND ADDITIONAL THUNDERSTORMS WILL MOVE
  THROUGH OVER THE NEXT FEW HOURS.
 
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GREENSBORO...HIGH POINT...MCLEANSVILLE...SUMMERFIELD...GIBSONVILLE...
  STOKESDALE...PLEASANT GARDEN...LAKE TOWNSEND MARINA...LAKE GUILFORD
  MACKINTOSH MARINA AND LAKE BRANDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...ROADS...LOW LYING AND POOR DRAINAGE AREAS. DO
NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. MANY
ROADS AND INTERSECTIONS IN THE AREA WILL QUICKLY FLOOD. WHEN
ENCOUNTERING FLOODED ROADS...TURN AROUND...DONT DROWN.

&&

LAT...LON 3615 7954 3592 7954 3604 8004 3625 8003

$$

30
2 follow-up statements
248 
WGUS72 KRAH 212207
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
607 PM EDT SAT MAY 21 2016

NCC081-220000-
/O.CON.KRAH.FF.W.0002.000000T0000Z-160522T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUILFORD NC-
607 PM EDT SAT MAY 21 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR
GUILFORD COUNTY...

AT 605 PM EDT...EMERGENCY MANAGEMENT REPORTED HIGH WATER AT SOUTH
EUGENE AND WEST WHITTINGTON STREET, AS WELL AS US 29 AND MARKET
STREET IN GREENSBORO. OVER ONE INCH OF RAIN HAS ALREADY FALLEN.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
GREENSBORO...HIGH POINT...MCLEANSVILLE...SUMMERFIELD...GIBSONVILLE...
STOKESDALE...PLEASANT GARDEN...LAKE TOWNSEND MARINA...LAKE GUILFORD
MACKINTOSH MARINA AND LAKE BRANDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...ROADS...LOW LYING AND POOR DRAINAGE AREAS. DO NOT
DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. MANY ROADS
AND INTERSECTIONS IN THE AREA WILL QUICKLY FLOOD. WHEN ENCOUNTERING
FLOODED ROADS...TURN AROUND...DONT DROWN.

&&

LAT...LON 3615 7954 3592 7954 3604 8004 3625 8003

$$

30
186 
WGUS72 KRAH 212359
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
759 PM EDT SAT MAY 21 2016

NCC081-220009-
/O.EXP.KRAH.FF.W.0002.000000T0000Z-160522T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUILFORD NC-
759 PM EDT SAT MAY 21 2016

...THE FLASH FLOOD WARNING FOR GUILFORD COUNTY WILL EXPIRE AT 800 PM
EDT...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3615 7954 3592 7954 3604 8004 3625 8003

$$

30

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 3:43 PM EDTSpecial Weather StatementRAHGuilford47 min
May 21, 3:55 PM EDTSpecial Weather StatementRAHForsyth65 min
May 21, 4:25 PM EDTSevere Thunderstorm WarningRAHGuilford50 min
May 21, 5:00 PM EDTSpecial Weather StatementRAHForsyth45 min
May 21, 5:38 PM EDTAreal Flood AdvisoryRAHDavidson, Forsyth, Guilford, Randolph2 hr
May 21, 6:11 PM EDTSevere Thunderstorm WarningRAHChatham, Randolph49 min
May 21, 6:51 PM EDTSpecial Weather StatementRAHChatham, Harnett, Lee, Wake39 min
May 21, 7:39 PM EDTSpecial Weather StatementRAHHarnett66 min
May 21, 7:58 PM EDTSpecial Weather StatementRAHMontgomery62 min

Nearby

Flash Flood Warnings in North Carolina, 2016Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.