Alert archive / West Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 29, NWS Pittsburgh, PA

August 16, 2021Marion County, Monongalia County, West Virginia

NWS Pittsburgh, PA issued this flash flood warning at Aug 16, 2021, 7:18 PM EDT for Marion County, Monongalia County, West Virginia. It was in force for 2 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 16, 2021, 7:18 PM EDT (23:18 UTC)
Expired: Aug 16, 2021, 9:26 PM EDT
In force: 2 hr
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: None

Counties Marion County, WV, Monongalia County, WV

The radar

The Pittsburgh radar (KPBZ), 106 km from the middle of the area, began a volume at 23:21 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 16, 7:55 PM EDT	FLASH FLOOD	Fairview, WV	COUNTY 911 CENTER REPORTED WATER OVERFLOWING CREEK BANKS AND INTO SEVERAL RESIDENCES AND ACROSS ROADWAYS IN FAIRVIEW.

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

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.3 hours before the alert went out and 92 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: -73 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

001 
WGUS51 KPBZ 162318
FFWPBZ
WVC049-061-170230-
/O.NEW.KPBZ.FF.W.0029.210816T2318Z-210817T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
718 PM EDT Mon Aug 16 2021

The National Weather Service in Pittsburgh has issued a

* Flash Flood Warning for...
  North Central Marion County in northern West Virginia...
  Central Monongalia County in northern West Virginia...

* Until 1030 PM EDT.

* At 718 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. 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...
  Fairview, Rivesville, Grant Town, Baxter, Crown, Georgetown and 
  Everettville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3962 8027 3964 8024 3961 8023 3958 8017
      3962 8011 3957 8007 3956 8007 3956 8010
      3955 8010 3953 8010 3953 8013 3955 8020
      3957 8024 3958 8029 3960 8029

FLASH FLOOD...RADAR INDICATED

$$

Brown

2 follow-up statements

916 
WGUS71 KPBZ 170026
FFSPBZ

Flash Flood Statement
National Weather Service Pittsburgh PA
826 PM EDT Mon Aug 16 2021

WVC049-061-170230-
/O.CON.KPBZ.FF.W.0029.000000T0000Z-210817T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion WV-Monongalia WV-
826 PM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT THIS 
EVENING FOR NORTH CENTRAL MARION AND CENTRAL MONONGALIA COUNTIES...

At 826 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 3 inches of rain have 
fallen. 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...
  Fairview, Rivesville, Grant Town, Baxter, Crown, Georgetown and 
  Everettville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3962 8027 3964 8024 3961 8023 3958 8017
      3962 8011 3957 8007 3956 8007 3956 8010
      3955 8010 3953 8010 3953 8013 3955 8020
      3957 8024 3958 8029 3960 8029

FLASH FLOOD...RADAR INDICATED

$$

Brown

736 
WGUS71 KPBZ 170126
FFSPBZ

Flash Flood Statement
National Weather Service Pittsburgh PA
926 PM EDT Mon Aug 16 2021

WVC049-061-170136-
/O.CAN.KPBZ.FF.W.0029.000000T0000Z-210817T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion WV-Monongalia WV-
926 PM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL MARION AND 
CENTRAL MONONGALIA COUNTIES...

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

LAT...LON 3962 8027 3964 8024 3961 8023 3958 8017
      3962 8011 3957 8007 3956 8007 3956 8010
      3955 8010 3953 8010 3953 8013 3955 8020
      3957 8024 3958 8029 3960 8029

$$

Brown

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 16, 4:17 PM EDT	Areal Flood Advisory	PBZ	Monongalia	77 min
Aug 16, 6:27 PM EDT	Flash Flood Warning	PBZ	Marion, Monongalia	3 hr

Nearby

Flash Flood Warnings in West 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.