Alert archive / Virginia / Flash Flood Warnings in 2024

Flash Flood Warning 21, NWS Blacksburg, VA

July 17, 2024Halifax County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Jul 17, 2024, 10:44 PM EDT for Halifax County, Virginia. It was in force for 3 hr. 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 17, 2024, 10:44 PM EDT (02:44 UTC)
Expired: Jul 18, 2024, 1:51 AM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

County Halifax County, VA

The radar

The Raleigh/Durham radar (KRAX), 108 km from the middle of the area, began a volume at 02:44 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

Roanoke, VA (KRNK), launched 00:00Z, 2.7 hours before the alert went out and 93 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: 594 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1286 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

002 
WGUS51 KRNK 180244
FFWRNK
VAC083-180845-
/O.NEW.KRNK.FF.W.0021.240718T0244Z-240718T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
1044 PM EDT Wed Jul 17 2024

The National Weather Service in Blacksburg has issued a

* Flash Flood Warning for...
  Southeastern Halifax County in south central Virginia...

* Until 445 AM EDT Thursday.

* At 1044 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 4 inches of rain have 
  fallen. The expected rainfall rate is 2 to 3 inches in 1 hour. 
  Additional rainfall amounts up to 1.5 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Virgilina...                       Cluster Springs...
  Alton...                           Hitesburg...

This includes the following streams and drainages...
  Dan River, Butrum Creek, Coleman Creek, Big Bluewing Creek, Big 
  Branch, Aarons Creek, Bales Spring Branch and Bowes Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

When it is safe to do so, please send your reports of flooding, 
including mudslides or flooded roads, to the National Weather 
Service by calling toll free at 1...8 6 6...2 1 5...4 3 2 4. Reports 
and pictures can also be shared on the National Weather Service 
Blacksburg Facebook page and on Twitter.

&&

LAT...LON 3669 7868 3668 7870 3667 7870 3664 7871
      3663 7871 3662 7871 3660 7872 3659 7871
      3659 7872 3658 7872 3657 7873 3655 7874
      3655 7873 3654 7873 3654 7905 3667 7900

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR

$$

BMG

2 follow-up statements

651 
WGUS71 KRNK 180358
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
1158 PM EDT Wed Jul 17 2024

VAC083-180845-
/O.CON.KRNK.FF.W.0021.000000T0000Z-240718T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Halifax VA-
1158 PM EDT Wed Jul 17 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM EDT THURSDAY 
FOR SOUTHEASTERN HALIFAX COUNTY...

At 1158 PM EDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to 4 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch are possible in the 
warned area. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

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...
  Virgilina...                       Cluster Springs...
Alton...                           Hitesburg...

This includes the following streams and drainages...
  Dan River, Butrum Creek, Coleman Creek, Big Bluewing Creek, Big 
  Branch, Aarons Creek, Bales Spring Branch and Bowes Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

When it is safe to do so, please send your reports of flooding, 
including mudslides or flooded roads, to the National Weather 
Service by calling toll free at 1...8 6 6...2 1 5...4 3 2 4. Reports 
and pictures can also be shared on the National Weather Service 
Blacksburg Facebook page and on Twitter.

&&

LAT...LON 3669 7868 3668 7870 3667 7870 3664 7871
      3663 7871 3662 7871 3660 7872 3659 7871
      3659 7872 3658 7872 3657 7873 3655 7874
      3655 7873 3654 7873 3654 7905 3667 7900

FLASH FLOOD...RADAR INDICATED

$$

BMG

525 
WGUS71 KRNK 180551
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
151 AM EDT Thu Jul 18 2024

VAC083-180601-
/O.CAN.KRNK.FF.W.0021.000000T0000Z-240718T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Halifax VA-
151 AM EDT Thu Jul 18 2024

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN HALIFAX 
COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 3669 7868 3668 7870 3667 7870 3664 7871
      3663 7871 3662 7871 3660 7872 3659 7871
      3659 7872 3658 7872 3657 7873 3655 7874
      3655 7873 3654 7873 3654 7905 3667 7900

$$

BMG

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 8:08 PM EDT	Special Weather Statement	RNK	Carroll	37 min
Jul 17, 8:09 PM EDT	Special Weather Statement	RNK	Giles	36 min
Jul 17, 8:46 PM EDT	Special Weather Statement	RNK	Floyd, Patrick	29 min
Jul 17, 9:23 PM EDT	Special Weather Statement	RNK	Halifax	37 min
Jul 17, 9:47 PM EDT	Areal Flood Advisory	RNK	Halifax	118 min
Jul 18, 8:37 AM EDT	Special Weather Statement	RNK	Pulaski, City of Radford	23 min
Jul 18, 9:06 AM EDT	Special Weather Statement	RNK	Craig, Floyd, Franklin, Giles, Montgomery, Pulaski and 4 more	24 min
Jul 18, 9:38 AM EDT	Special Weather Statement	RNK	Floyd, Franklin, Montgomery, Roanoke, City of Roanoke, City of Salem	37 min
Jul 18, 10:20 AM EDT	Special Weather Statement	RNK	Franklin, Henry, Patrick, City of Martinsville	40 min
Jul 18, 10:58 AM EDT	Special Weather Statement	RNK	Campbell, Pittsylvania	32 min
Jul 18, 11:27 AM EDT	Special Weather Statement	RNK	Campbell, Pittsylvania, City of Danville	33 min
Jul 18, 11:30 AM EDT	Flood Watch	RNK	Campbell, Charlotte, Halifax, Henry, Pittsylvania, City of Danville and 2 more	6 hr
Jul 18, 12:37 PM EDT	Special Weather Statement	RNK	Buckingham, Charlotte, Halifax	23 min
Jul 18, 1:04 PM EDT	Special Weather Statement	RNK	Charlotte	26 min
Jul 18, 5:36 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	24 min

Nearby

Flash Flood Warnings in Virginia, 2024 Every flash flood warning in 2024

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.