Alert archive / Maine / Flash Flood Warnings in 2021

Flash Flood Warning 9, NWS Gray, ME

July 18, 20216 counties in Maine

NWS Gray, ME issued this flash flood warning at Jul 18, 2021, 10:36 AM EDT for 6 counties in Maine. It was in force for 84 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 18, 2021, 10:36 AM EDT (14:36 UTC)
Expired: Jul 18, 2021, 12:00 PM EDT
In force: 84 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

Counties Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Sagadahoc County, ME

The radar

The Portland,ME radar (KGYX), 54 km from the middle of the area, began a volume at 14:37 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

Gray, ME (KGYX), launched 12:00Z, 2.6 hours before the alert went out and 54 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

506 
WGUS51 KGYX 181436
FFWGYX
MEC001-005-011-013-015-023-181600-
/O.NEW.KGYX.FF.W.0009.210718T1436Z-210718T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Gray ME
1036 AM EDT Sun Jul 18 2021

The National Weather Service in Gray has issued a

* Flash Flood Warning for...
  Southern Kennebec County in south central Maine...
  Southwestern Knox County in south central Maine...
  Lincoln County in south central Maine...
  Sagadahoc County in south central Maine...
  Southeastern Androscoggin County in southwestern Maine...
  East Central Cumberland County in southwestern Maine...

* Until noon EDT.

* At 1036 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. 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...
  Brunswick, Bath, Damariscotta, Wiscasset, Topsham, Bristol, 
  Georgetown, Bremen, Woolwich, and Lisbon.

This includes the following Rec locations...
	Reid State Park, Popham Beach State Park, and Pemaquid Beach.

This includes the following highways...
	Interstate 295 between mile markers 28 and 42.

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 4402 7006 4415 6968 4421 6946 4416 6934
      4397 6930 4385 6932 4382 6941 4384 6944
      4381 6946 4370 6997

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

MBC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 7:59 AM EDT	Areal Flood Advisory	GYX	Androscoggin, Cumberland, Lincoln, Sagadahoc, York	3 hr
Jul 18, 9:50 AM EDT	Areal Flood Advisory	GYX	Cumberland, Kennebec, Knox, Lincoln, Sagadahoc, Waldo	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.