Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 23, NWS Raleigh, NC

September 22, 20214 counties in North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 22, 2021, 10:06 PM EDT for 4 counties in North Carolina. It was in force for 2 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: Sep 22, 2021, 10:06 PM EDT (02:06 UTC)
Expired: Sep 23, 2021, 12:12 AM EDT
In force: 2 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Chatham County, NC, Montgomery County, NC, Moore County, NC, Randolph County, NC

The radar

The Raleigh/Durham radar (KRAX), 104 km from the middle of the area, began a volume at 02:06 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

Time	Report	Where	Remark
Sep 22, 10:14 PM EDT	FLASH FLOOD	Robbins, NC	911 CALL CENTER REPORTS MULTIPLE ROADS REMAIN FLOODED AROUND ROBBINS, ESPECIALLY ALONG 705.

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 00:00Z, 2.1 hours before the alert went out and 70 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: 30 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

188 
WGUS52 KRAH 230206
FFWRAH
NCC037-123-125-151-230500-
/O.NEW.KRAH.FF.W.0023.210923T0206Z-210923T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Raleigh NC
1006 PM EDT Wed Sep 22 2021

The National Weather Service in Raleigh has issued a

* Flash Flood Warning for...
  Southwestern Chatham County in central North Carolina...
  Northeastern Montgomery County in central North Carolina...
  Northwestern Moore County in central North Carolina...
  Southeastern Randolph County in central North Carolina...

* Until 100 AM EDT.

* At 1006 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  3 and 6 inches of rain have fallen. Additional rainfall amounts up 
  to 1 inch are possible in the warned area. Flash flooding is 
  ongoing.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Troy, Biscoe, Robbins, Star, Candor, Highfalls, Eagle Springs, 
  Steeds, Seven Lakes, Harpers Crossroads and Hasty.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3568 7952 3568 7930 3523 7960 3523 7996
      3547 7984

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

AS

1 follow-up statement

616 
WGUS72 KRAH 230412
FFSRAH

Flash Flood Statement
National Weather Service Raleigh NC
1212 AM EDT Thu Sep 23 2021

NCC037-123-125-151-230422-
/O.CAN.KRAH.FF.W.0023.000000T0000Z-210923T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chatham NC-Montgomery NC-Moore NC-Randolph NC-
1212 AM EDT Thu Sep 23 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CHATHAM, 
NORTHEASTERN MONTGOMERY, NORTHWESTERN MOORE AND SOUTHEASTERN 
RANDOLPH COUNTIES...

Flood waters have receded and the heavy rain has ended. Flooding is 
no longer expected to pose a threat. Please continue to heed 
remaining road closures.

LAT...LON 3568 7952 3568 7930 3523 7960 3523 7996
      3547 7984

$$

CA

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 23, 2:20 AM EDT	Special Weather Statement	RAH	Nash	40 min

Nearby

Flash Flood Warnings in North Carolina, 2021 Every flash flood warning in 2021

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.