Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 30, NWS Baltimore/Washington

July 26, 20215 counties in Virginia

NWS Baltimore/Washington issued this flash flood warning at Jul 26, 2021, 2:12 PM EDT for 5 counties in Virginia. It was in force for 106 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 26, 2021, 2:12 PM EDT (18:12 UTC)
Expired: Jul 26, 2021, 3:58 PM EDT
In force: 106 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Albemarle County, VA, Augusta County, VA, City of Staunton, VA, City of Waynesboro, VA, Nelson County, VA

The radar

The Sterling radar (KLWX), 161 km from the middle of the area, began a volume at 18:13 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, 6.2 hours before the alert went out and 109 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: 658 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

100 
WGUS51 KLWX 261812
FFWLWX
VAC003-015-125-790-820-262115-
/O.NEW.KLWX.FF.W.0030.210726T1812Z-210726T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
212 PM EDT Mon Jul 26 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  West Central Albemarle County in central Virginia...
  Northeastern Nelson County in central Virginia...
  Southeastern Augusta County in western Virginia...
  The City of Staunton in western Virginia...
  The City of Waynesboro in western Virginia...

* Until 515 PM EDT.

* At 212 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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...
  Staunton...                        Waynesboro...
  Stuarts Draft...                   Sherando...
  Afton...                           Fishersville...
  Verona...                          Lyndhurst...
  Nellysford...                      Hermitage...
  Afton Mountain...                  Greenfield...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3808 7905 3815 7920 3823 7911 3823 7904
      3814 7890 3810 7886 3806 7882 3803 7878
      3794 7875 3791 7876 3789 7882

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

BJL

1 follow-up statement

724 
WGUS71 KLWX 261958
FFSLWX

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
358 PM EDT Mon Jul 26 2021

VAC003-015-125-790-820-262008-
/O.CAN.KLWX.FF.W.0030.000000T0000Z-210726T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Albemarle VA-Augusta VA-Nelson VA-City of Staunton VA-City of
Waynesboro VA-
358 PM EDT Mon Jul 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL ALBEMARLE, 
NORTHEASTERN NELSON AND SOUTHEASTERN AUGUSTA COUNTIES AND THE CITY 
OF STAUNTON AND THE CITY OF WAYNESBORO...

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

LAT...LON 3808 7905 3815 7920 3823 7911 3823 7904
      3814 7890 3810 7886 3806 7882 3803 7878
      3794 7875 3791 7876 3789 7882

$$

DHOF

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 11:05 PM EDT	Special Marine Warning	LWX		115 min
Jul 26, 1:34 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, City of Staunton, City of Waynesboro	41 min
Jul 26, 2:14 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	46 min
Jul 26, 2:47 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Nelson	28 min
Jul 26, 3:03 PM EDT	Special Marine Warning	LWX		71 min
Jul 26, 3:05 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Nelson	10 min
Jul 26, 3:14 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	46 min
Jul 26, 6:37 PM EDT	Severe Thunderstorm Warning	LWX	Page, Rockingham, Shenandoah	23 min
Jul 26, 6:48 PM EDT	Special Marine Warning	LWX		61 min
Jul 26, 7:13 PM EDT	Special Marine Warning	LWX		92 min
Jul 26, 7:36 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Prince William, City of Alexandria, City of Falls Church, City of Manassas and 1 more	24 min
Jul 26, 7:43 PM EDT	Special Marine Warning	LWX		92 min

Nearby

Flash Flood Warnings in Virginia, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.