Alert archive / West Virginia / Flash Flood Warnings in 2021
Flash Flood Warning 26, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Aug 4, 2021, 10:39 PM EDT for Mercer County, Summers County, West Virginia. It was in force for 4 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
- Aug 4, 2021, 10:39 PM EDT (02:39 UTC)
- Expired
- Aug 5, 2021, 2:13 AM EDT
- In force
- 4 hr
- Issued by
- NWS Blacksburg, VA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mercer County, WV, Summers County, WV
The radar
The Roanoke radar (KFCX), 97 km from the middle of the area, began a volume at 02:40 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 |
|---|---|---|---|
| Aug 4, 11:00 PM EDT | HEAVY RAIN 5 | 4 S Odd, WV | 5.00 INCHES OF RAIN REPORTED AT EGERIA IFLOWS BETWEEN 9 PM AND 11 PM |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Roanoke, VA (KRNK), launched 00:00Z, 2.7 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.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 1604 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
026
WGUS51 KRNK 050239
FFWRNK
WVC055-089-050845-
/O.NEW.KRNK.FF.W.0026.210805T0239Z-210805T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
1039 PM EDT Wed Aug 4 2021
The National Weather Service in Blacksburg has issued a
* Flash Flood Warning for...
Western Mercer County in southeastern West Virginia...
West Central Summers County in southeastern West Virginia...
* Until 445 AM EDT Thursday.
* At 1039 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the western part of Mercer county near and along
to just east of the Raleigh and Wyoming County lines. This
includes areas near Camp Creek State Park, Winonah, and Flat Top.
Between 2.5 and 4 inches of rain have fallen to the west of these
areas during the past 1 to 2 hours. The expected rainfall rate is
1.5 to 2 inches in 30 minutes. Additional rainfall amounts of 1.5
to 3 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...
Matoaka... Camp Creek...
Bramwell... Camp Creek State Park...
Spanishburg... Wenonah...
Flat Top...
This includes the following streams and drainages...
Bluestone River, Flipping Creek, Camp Creek, Crane Creek, Big
Branch and Clark Branch.
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.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
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 3759 8109 3761 8106 3763 8106 3764 8106
3765 8103 3765 8098 3765 8095 3750 8106
3728 8127 3734 8136 3742 8131 3740 8129
3742 8128 3746 8131 3747 8128 3750 8126
3751 8120 3754 8120 3758 8120 3760 8114
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-2 INCHES IN 29 MINUTES
$$
RAB2 follow-up statements
469
WGUS71 KRNK 050330
FFSRNK
Flash Flood Statement
National Weather Service Blacksburg VA
1130 PM EDT Wed Aug 4 2021
WVC089-050340-
/O.CAN.KRNK.FF.W.0026.000000T0000Z-210805T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Summers WV-
1130 PM EDT Wed Aug 4 2021
...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL SUMMERS
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3754 8103 3728 8127 3734 8136 3742 8131
3740 8129 3742 8128 3746 8131 3747 8128
3750 8126 3751 8120 3758 8120 3760 8114
3759 8112 3759 8111
$$
WVC055-050845-
/O.CON.KRNK.FF.W.0026.000000T0000Z-210805T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer WV-
1130 PM EDT Wed Aug 4 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM EDT THURSDAY
FOR WESTERN MERCER COUNTY...
At 1130 PM EDT, Doppler radar indicated thunderstorms have weakened
across western Mercer County,but runoff from 3 to 5 inches of rain
that fell will likely continue to cause flooding. Additional
rainfall amounts of 0.5 to 1 inch are possible in the warned area.
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...
Matoaka...
Wenonah...
Camp Creek...
This includes the following streams and drainages...
Flipping Creek, Glade Branch, Camp Creek, Crane Creek, Big Branch
and Clark Branch.
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.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
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 3754 8103 3728 8127 3734 8136 3742 8131
3740 8129 3742 8128 3746 8131 3747 8128
3750 8126 3751 8120 3758 8120 3760 8114
3759 8112 3759 8111
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
PH119
WGUS71 KRNK 050613
FFSRNK
Flash Flood Statement
National Weather Service Blacksburg VA
213 AM EDT Thu Aug 5 2021
WVC055-050623-
/O.CAN.KRNK.FF.W.0026.000000T0000Z-210805T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer WV-
213 AM EDT Thu Aug 5 2021
...FLASH FLOOD WARNING IS CANCELLED FOR WESTERN MERCER COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3754 8103 3728 8127 3734 8136 3742 8131
3740 8129 3742 8128 3746 8131 3747 8128
3750 8126 3751 8120 3758 8120 3760 8114
3759 8112 3759 8111
$$
PHThe office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 10:10 PM EDT | Special Weather Statement | RNK | Mercer | 50 min |
Nearby
Flash Flood Warnings in West Virginia, 2021Every 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.