Alert archive / Virginia / Flash Flood Warnings in 2021
Flash Flood Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jul 7, 2021, 4:20 PM EDT for Nelson County, Virginia. 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 outline as issued.
The facts
- Issued
- Jul 7, 2021, 4:20 PM EDT (20:20 UTC)
- Expired
- Jul 7, 2021, 6:07 PM EDT
- In force
- 107 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Nelson County, VA
The radar
The Roanoke radar (KFCX), 149 km from the middle of the area, began a volume at 20:20 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 12:00Z, 8.3 hours before the alert went out and 89 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
- 56 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1246 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
087
WGUS51 KLWX 072020
FFWLWX
VAC125-072330-
/O.NEW.KLWX.FF.W.0021.210707T2020Z-210707T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
420 PM EDT Wed Jul 7 2021
The National Weather Service in Sterling Virginia has issued a
* Flash Flood Warning for...
West Central Nelson County in central Virginia...
* Until 730 PM EDT.
* At 420 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Wintergreen... Tyro...
Bryant... Jonesboro...
Massies Mill...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3793 7895 3790 7892 3787 7889 3784 7887
3776 7901 3784 7910 3789 7902 3789 7901
3788 7900 3789 7899 3790 7898 3791 7898
3791 7897 3792 7896
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BKF1 follow-up statement
745
WGUS71 KLWX 072207
FFSLWX
Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
607 PM EDT Wed Jul 7 2021
VAC125-072217-
/O.CAN.KLWX.FF.W.0021.000000T0000Z-210707T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Nelson VA-
607 PM EDT Wed Jul 7 2021
...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL NELSON COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3793 7895 3790 7892 3787 7889 3784 7887
3776 7901 3784 7910 3789 7902 3789 7901
3788 7900 3789 7899 3790 7898 3791 7898
3791 7897 3792 7896
$$
BKFThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 12:49 AM EDT | Small Craft Advisory | LWX | 22 hr | |
| Jul 7, 3:12 PM EDT | Flash Flood Watch | LWX | King George | 33 hr |
| Jul 7, 3:45 PM EDT | Severe Thunderstorm Warning | LWX | Augusta, Nelson | 30 min |
| Jul 7, 3:52 PM EDT | Small Craft Advisory | LWX | 42 hr | |
| Jul 7, 4:06 PM EDT | Special Marine Warning | LWX | 43 min | |
| Jul 7, 4:09 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 26 min |
| Jul 7, 4:13 PM EDT | Severe Thunderstorm Warning | LWX | Rockingham, Shenandoah | 47 min |
| Jul 7, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | Augusta, City of Staunton | 35 min |
| Jul 7, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Augusta, Rockingham | 29 min |
| Jul 7, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Shenandoah | 28 min |
| Jul 7, 7:03 PM EDT | Severe Thunderstorm Warning | LWX | Page, Shenandoah, Warren | 27 min |
| Jul 7, 7:27 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 33 min |
Nearby
Flash Flood Warnings in 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.