Alert archive / Maine / Flash Flood Warnings in 2021

Flash Flood Warning 17, NWS Gray, ME

August 24, 2021York County, Maine

NWS Gray, ME issued this flash flood warning at Aug 24, 2021, 5:09 AM EDT for York County, Maine. 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 24, 2021, 5:09 AM EDT (09:09 UTC)
Expired: Aug 24, 2021, 7:24 AM EDT
In force: 2 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

County York County, ME

The radar

The Portland,ME radar (KGYX), 60 km from the middle of the area, began a volume at 09:08 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 24, 6:30 AM EDT	HEAVY RAIN 3.01	3 Nne Berwick, ME

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

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 9.2 hours before the alert went out and 60 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: 100 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

854 
WGUS51 KGYX 240909
FFWGYX
MEC031-241215-
/O.NEW.KGYX.FF.W.0017.210824T0909Z-210824T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Gray ME
509 AM EDT Tue Aug 24 2021

The National Weather Service in Gray has issued a

* Flash Flood Warning for...
  Central York County in southwestern Maine...

* Until 815 AM EDT.

* At 509 AM EDT, Doppler radar indicated showers and thunderstorms 
  producing heavy rain across the warned area. Between 1.5 and 2.5 
  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...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...
  Biddeford, Sanford, Saco, Kennebunk, Berwick, Lebanon, 
  Kennebunkport, Wells, South Berwick, and Arundel.

This includes the following Rec locations...
	Wells BeachFortunes Rock Beach.

This includes the following highways...
	Interstate 95 between mile markers 18 and 27.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 4326 7082 4337 7090 4347 7036 4344 7034
      4340 7031 4340 7032 4340 7033 4338 7034
      4337 7035 4336 7036 4335 7036 4334 7037

FLASH FLOOD...RADAR INDICATED

$$

JC

1 follow-up statement

756 
WGUS71 KGYX 241124
FFSGYX

Flash Flood Statement
National Weather Service Gray ME
724 AM EDT Tue Aug 24 2021

MEC031-241134-
/O.CAN.KGYX.FF.W.0017.000000T0000Z-210824T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
York ME-
724 AM EDT Tue Aug 24 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL YORK COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed any road closures.

LAT...LON 4326 7082 4337 7090 4347 7036 4344 7034
      4340 7031 4340 7032 4340 7033 4338 7034
      4337 7035 4336 7036 4335 7036 4334 7037

$$

JC

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 4:22 AM EDT	Areal Flood Advisory	GYX	York	3 hr

Nearby

Flash Flood Warnings in Maine, 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.