Alert archive / Maine / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Gray, ME

July 9, 20214 counties in Maine; Strafford County, New Hampshire

NWS Gray, ME issued this flash flood warning at Jul 9, 2021, 1:10 PM EDT for 4 counties in Maine; Strafford County, New Hampshire. It was in force for 4 hr. 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 9, 2021, 1:10 PM EDT (17:10 UTC)
Expired: Jul 9, 2021, 5:00 PM EDT
In force: 4 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

Counties Androscoggin County, ME, Cumberland County, ME, Sagadahoc County, ME, York County, ME, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 40 km from the middle of the area, began a volume at 17:09 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, 5.2 hours before the alert went out and 40 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: 638 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 384 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

748 
WGUS51 KGYX 091710
FFWGYX
MEC001-005-023-031-NHC017-100100-
/O.NEW.KGYX.FF.W.0005.210709T1710Z-210710T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Gray ME
110 PM EDT Fri Jul 9 2021

The National Weather Service in Gray has issued a

* Flash Flood Warning for...
  Southeastern Sagadahoc County in south central Maine...
  South Central Androscoggin County in southwestern Maine...
  Central Cumberland County in southwestern Maine...
  Central York County in southwestern Maine...
  East Central Strafford County in central New Hampshire...

* Until 900 PM EDT Friday.

* At 110 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is expected to begin shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Portland, Rochester, South Portland, Auburn, Biddeford, Brunswick, 
  Westbrook, Alfred, Sanford, and Dover.

This includes the following Rec locations...

Ogunquit Beach, Wells Beach, Fortunes Rock Beach, Higgins Beach, 
Crescent Beach State Park, Scarborough Beach State Park, Reid State 
Park, Old Orchard Beach and Popham Beach State Park.

This includes the following highways...
	Interstate 95 between mile markers 14 and 74.
	Interstate 295 between mile markers 1 and 28.

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 4325 7106 4405 7030 4377 6967 4366 6976
      4365 6984 4368 6996 4367 6998 4362 7000
      4361 7004 4357 7009 4357 7015 4354 7015
      4350 7019 4348 7031 4348 7029 4345 7028
      4342 7029 4333 7039 4329 7052 4325 7052

FLASH FLOOD...RADAR INDICATED

$$

JC

2 follow-up statements

892 
WGUS71 KGYX 091939
FFSGYX

Flash Flood Statement
National Weather Service Gray ME
339 PM EDT Fri Jul 9 2021

MEC001-005-023-031-NHC017-100100-
/O.CON.KGYX.FF.W.0005.000000T0000Z-210710T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Androscoggin ME-Cumberland ME-Sagadahoc ME-York ME-Strafford NH-
339 PM EDT Fri Jul 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING 
FOR SOUTHEASTERN SAGADAHOC, SOUTH CENTRAL ANDROSCOGGIN, CENTRAL 
CUMBERLAND, CENTRAL YORK, AND EAST CENTRAL STRAFFORD COUNTIES...

At 339 PM EDT, Doppler radar indicated heavy rain across the warned 
area. Between 1 and 3 inches of rain have fallen. Additional 
rainfall amounts of 1 to 2 inches are possible in the warned area 
over the next few hours. Flash flooding is ongoing or expected to 
begin shortly.

HAZARD...Flash flooding caused by heavy rain.

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...
  Portland, Rochester, South Portland, Auburn, Biddeford, Brunswick, 
  Westbrook, Alfred, Sanford, and Dover.

High rainfall rates up to 3 inches per hour are possible. Torrential 
rainfall like this can reduce visibility for motorists.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4325 7106 4405 7030 4377 6967 4366 6976
      4365 6984 4368 6996 4367 6998 4362 7000
      4361 7004 4357 7009 4357 7015 4354 7015
      4350 7019 4348 7031 4348 7029 4345 7028
      4342 7029 4333 7039 4329 7052 4325 7052

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

SJ

828 
WGUS71 KGYX 092100
FFSGYX

Flash Flood Statement
National Weather Service Gray ME
500 PM EDT Fri Jul 9 2021

MEC001-005-023-031-NHC017-092110-
/O.CAN.KGYX.FF.W.0005.000000T0000Z-210710T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Androscoggin ME-Cumberland ME-Sagadahoc ME-York ME-Strafford NH-
500 PM EDT Fri Jul 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN SAGADAHOC, 
SOUTH CENTRAL ANDROSCOGGIN, CENTRAL CUMBERLAND, CENTRAL YORK, AND 
EAST CENTRAL STRAFFORD COUNTIES...

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



LAT...LON 4325 7106 4405 7030 4377 6967 4366 6976
      4365 6984 4368 6996 4367 6998 4362 7000
      4361 7004 4357 7009 4357 7015 4354 7015
      4350 7019 4348 7031 4348 7029 4345 7028
      4342 7029 4333 7039 4329 7052 4325 7052

$$

SJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 3:36 AM EDT	Small Craft Advisory	GYX		35 hr
Jul 9, 1:01 PM EDT	Flash Flood Warning	GYX	York	4 hr
Jul 9, 3:15 PM EDT	Areal Flood Advisory	GYX	Androscoggin, Cumberland, Franklin, Kennebec, Knox, Lincoln and 4 more	3 hr
Jul 9, 6:27 PM EDT	Areal Flood Advisory	GYX	Cumberland, Kennebec, Knox, Lincoln, Sagadahoc, Somerset and 1 more	3 hr

Nearby

Flash Flood Warnings in Maine, 2021 Flash Flood Warnings in New Hampshire, 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.