Flash Flood Warning 69, NWS Baltimore/Washington

Issued

Sep 15, 2021, 6:20 PM EDT (22:20 UTC)

Expired

Sep 15, 2021, 8:25 PM EDT

In force

2 hr

Issued by

NWS Baltimore/Washington

Area

Storm-based polygon

Damage threat

Considerable

Flood severity

None

County Washington County, MD

The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 22:19 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.

372 
WGUS51 KLWX 152220
FFWLWX
MDC043-160130-
/O.NEW.KLWX.FF.W.0069.210915T2220Z-210916T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
620 PM EDT Wed Sep 15 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Northeastern Washington County in north central Maryland...

* Until 930 PM EDT.

* At 620 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 to 3 inches in 1 
  hour. 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...
  Hagerstown...                      Municipal Stadium...
  Robinwood...                       Fountainhead-Orchard Hills...
  Smithsburg...                      Paramount-Long Meadow...
  Williamsport...                    Halfway...
  Leitersburg...                     Fort Ritchie...
  Chewsville...                      Ringgold...
  Bridgeport...                      Highfield...

This includes the following Flood Prone Roads:
Potomac Avenue near Magnolia Avenue...


This includes the following streams and drainages...
  Antietam Creek, Little Antietam Creek, Grove Creek, Conococheague 
  Creek, Marsh Run, Potomac River and Hamilton Run.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Basement flooding can occur quickly and create a life-threatening 
situation. If you are in a basement, or a residence below street 
level, move to a higher floor immediately.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3972 7759 3972 7748 3967 7756 3961 7773
      3958 7780 3961 7781 3971 7765 3972 7761

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR

$$

RCM

553 
WGUS51 KLWX 152343
FFWLWX
MDC043-160430-
/O.EXT.KLWX.FF.W.0069.000000T0000Z-210916T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
743 PM EDT Wed Sep 15 2021

The National Weather Service in Sterling Virginia has extended the

* Flash Flood Warning for...
  Northeastern Washington County in north central Maryland...

* Until 1230 AM EDT.

* At 743 PM EDT, local law enforcement reported thunderstorms 
  producing heavy rain in Leitersburg. Between 2 and 4 inches of 
  rain have fallen. Flash flooding is already occurring.

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

  SOURCE...Law enforcement reported.

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

* Some locations that will experience flash flooding include...
  Robinwood...                       Smithsburg...
  Paramount-Long Meadow...           Leitersburg...
  Fort Ritchie...                    Chewsville...
  Ringgold...                        Highfield...

This includes the following streams and drainages...
  Antietam Creek, Little Antietam Creek, Marsh Run and Grove Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Basement flooding can occur quickly and create a life-threatening 
situation. If you are in a basement, or a residence below street 
level, move to a higher floor immediately.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3972 7748 3967 7756 3964 7766 3967 7768
      3968 7769 3971 7765 3972 7761

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

$$

RCM

507 
WGUS71 KLWX 160025
FFSLWX

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
825 PM EDT Wed Sep 15 2021

MDC043-160035-
/O.CAN.KLWX.FF.W.0069.000000T0000Z-210916T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington MD-
825 PM EDT Wed Sep 15 2021

...FLASH FLOOD WARNING IS CHANGED TO A FLOOD WARNING FOR 
NORTHEASTERN WASHINGTON COUNTY...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat. A flood warning has replaced this flash flood 
warning. Please continue to heed remaining road closures.

LAT...LON 3972 7748 3967 7756 3964 7766 3967 7768
      3968 7769 3971 7765 3972 7761

$$

RCM

Flash Flood Warnings in Maryland, 2021Every flash flood warning in 2021

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.