Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Baltimore/Washington

May 4, 2021Page County, Rockingham County, Shenandoah County, Virginia

NWS Baltimore/Washington issued this flash flood warning at May 4, 2021, 4:00 PM EDT for Page County, Rockingham County, Shenandoah County, Virginia. It was in force for 3 hr. 7 reports 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: May 4, 2021, 4:00 PM EDT (20:00 UTC)
Expired: May 4, 2021, 7:00 PM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Page County, VA, Rockingham County, VA, Shenandoah County, VA

The radar

The Sterling radar (KLWX), 96 km from the middle of the area, began a volume at 20:04 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
May 4, 4:00 PM EDT	FLOOD	2 Ssw New Market, VA	NORTH VALLEY PIKE IS CLOSED DUE TO FLOODING NEAR CRANEY ISLAND ROAD.
May 4, 4:31 PM EDT	FLOOD	2 W Hamburg, VA	EGYPT BEND ROAD CLOSED DUE TO FLOODING NEAR RIVER ROAD.
May 4, 4:31 PM EDT	FLOOD	Luray, VA	EGYPT BEND ROAD CLOSED DUE TO FLOODING NEAR RIVER ROAD.
May 4, 4:45 PM EDT	FLOOD	2 E New Market, VA	WATER RUNNING ACROSS ROUTE 211 COVERING ONE LANE AT SEVERAL LOCATIONS ALONG THE PAGE/SHENANDOAH COUNTY LINE.
May 4, 5:45 PM EDT	FLOOD	1 Sw Luray, VA	SOUTH COURT STREET CLOSED AT RAILROAD UNDERPASS DUE TO FLOODING
May 4, 5:45 PM EDT	FLOOD	New Market, VA	A STREAM GAUGE ON SMITH CREEK REACHED MINOR FLOOD STAGE.
May 4, 5:45 PM EDT	FLASH FLOOD	New Market, VA	NORTH FORK SHENANDOAH RIVER AT NEW MARKET ROSE RAPIDLY REACHING MINOR FLOOD STAGE IN LESS THAN 3 HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 102 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: 82 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 1036 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

102 
WGUS51 KLWX 042000
FFWLWX
VAC139-165-171-042300-
/O.NEW.KLWX.FF.W.0001.210504T2000Z-210504T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
400 PM EDT Tue May 4 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Central Page County in northwestern Virginia...
  South Central Shenandoah County in northwestern Virginia...
  East Central Rockingham County in western Virginia...

* Until 700 PM EDT.

* At 400 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 2.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that may experience flash flooding include...
  Luray...                           Broadway...
  Timberville...                     Mount Jackson...
  New Market...                      Leaksville...
  Hamburg...                         Quicksburg...
  Fairview...                        Kimball...




Additional rainfall amounts of 0.5 to 1 inch are possible in the 
warned area. Minor flooding was recently reported in Shenandoah 
County and will likely worsen as rain continues to fall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3876 7836 3869 7836 3867 7835 3865 7844
      3862 7852 3857 7873 3858 7880 3868 7877

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

$$

ADS

2 follow-up statements

684 
WGUS71 KLWX 042107
FFSLWX

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
507 PM EDT Tue May 4 2021

VAC139-165-171-042300-
/O.CON.KLWX.FF.W.0001.000000T0000Z-210504T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Page VA-Rockingham VA-Shenandoah VA-
507 PM EDT Tue May 4 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING 
FOR CENTRAL PAGE, SOUTH CENTRAL SHENANDOAH AND EAST CENTRAL 
ROCKINGHAM COUNTIES...

At 507 PM EDT, Doppler radar and local law enforcement reported 
thunderstorms had produced heavy rain across the warned area. 
Between 2 and 3 inches of rain have fallen. Flash flooding is 
ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Law enforcement. Several instances of flooding have been
         reported in Shenandoah County.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that may experience flash flooding include...
Luray...                           Broadway...
Timberville...                     Mount Jackson...
New Market...                      Leaksville...
Hamburg...                         Quicksburg...
Fairview...                        Kimball...

This includes the following Flood Prone Roads:
Rocky Branch Road along Rocky Branch...
Longs Road at Meadowview Drive...
River Road at Eygpt Bend Road...
Lyn-mar Road at Pass Run...
Old Forge Road near Hawksbill Creek...
Linden Avenue at Virginia Avenue...
Piney Mountain Road near Highway 611...
Route 658 near Highway 340...
Dry Run Road along Dry Run...


Heavy rain has ended, but a threat for flash flooding continues as 
water flows down local streams.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3876 7836 3869 7836 3867 7835 3865 7844
      3862 7852 3857 7873 3858 7880 3868 7877

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

ADS

760 
WGUS71 KLWX 042251
FFSLWX

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
651 PM EDT Tue May 4 2021

VAC139-165-171-042301-
/O.EXP.KLWX.FF.W.0001.000000T0000Z-210504T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Page VA-Rockingham VA-Shenandoah VA-
651 PM EDT Tue May 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 7 PM EDT THIS EVENING FOR 
CENTRAL PAGE, SOUTH CENTRAL SHENANDOAH AND EAST CENTRAL ROCKINGHAM 
COUNTIES...

The heavy rain has ended, and the threat for rapid rises of waters 
is diminishing. However, some flooding persists, so a Flood Warning 
remains in effect.

LAT...LON 3876 7836 3869 7836 3867 7835 3865 7844
      3862 7852 3857 7873 3858 7880 3868 7877

$$

ADS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 10:01 PM EDT	Special Marine Warning	LWX		89 min
May 4, 4:08 AM EDT	Gale Watch	LWX		24 hr
May 4, 4:08 AM EDT	Small Craft Advisory	LWX		50 hr
May 4, 1:48 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham, Shenandoah	42 min
May 4, 1:52 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham, Shenandoah	38 min
May 4, 2:15 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, City of Staunton	24 min
May 4, 2:27 PM EDT	Severe Thunderstorm Warning	LWX	Page, Rockingham, Shenandoah	48 min
May 4, 2:32 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, City of Waynesboro	43 min
May 4, 2:57 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Nelson	48 min
May 4, 3:08 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Page, Rappahannock, Shenandoah, Warren	52 min
May 4, 3:31 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Madison	32 min
May 4, 3:36 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Nelson	39 min
May 4, 3:46 PM EDT	Areal Flood Warning	LWX	Page, Rockingham, Shenandoah	9 hr
May 4, 3:57 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Prince William, Rappahannock, City of Manassas, City of Manassas Park	39 min
May 4, 4:01 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William	44 min
May 4, 4:08 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	36 min
May 4, 4:22 PM EDT	Special Marine Warning	LWX		68 min
May 4, 4:26 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Fauquier, Loudoun, Prince William, Stafford and 5 more	49 min
May 4, 4:41 PM EDT	Severe Thunderstorm Warning	LWX	Orange, Spotsylvania	37 min
May 4, 4:57 PM EDT	Severe Thunderstorm Warning	LWX	Spotsylvania, Stafford, City of Fredericksburg	48 min
May 4, 5:01 PM EDT	Special Marine Warning	LWX		89 min
May 4, 5:16 PM EDT	Special Marine Warning	LWX		119 min
May 4, 5:24 PM EDT	Severe Thunderstorm Warning	LWX	King George	51 min
May 4, 5:55 PM EDT	Special Marine Warning	LWX		95 min
May 4, 6:27 PM EDT	Special Marine Warning	LWX		93 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.