Alert archive / Maine / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Caribou, ME

June 9, 2021Washington County, Maine

NWS Caribou, ME issued this flash flood warning at Jun 9, 2021, 4:48 AM EDT for Washington County, Maine. It was in force for 2 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: Jun 9, 2021, 4:48 AM EDT (08:48 UTC)
Expired: Jun 9, 2021, 6:54 AM EDT
In force: 2 hr
Issued by: NWS Caribou, ME
Area: Storm-based polygon
Flood severity: None

County Washington County, ME

The radar

The Caribou radar (KCBW), 157 km from the middle of the area, began a volume at 08:48 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 00:00Z, 8.8 hours before the alert went out and 237 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: 1223 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1430 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

106 
WGUS51 KCAR 090848
FFWCAR
MEC029-091445-
/O.NEW.KCAR.FF.W.0001.210609T0848Z-210609T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Caribou ME
448 AM EDT Wed Jun 9 2021

The National Weather Service in Caribou has issued a

* Flash Flood Warning for...
  South Central Washington County in southeastern Maine...

* Until 1045 AM EDT.

* At 448 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 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...
  Machias, Jonesboro, Machiasport, Roque Bluffs and Whitneyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4469 6754 4468 6749 4466 6744 4465 6742
      4463 6742 4460 6744 4461 6749 4463 6752
      4465 6755

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

$$

Maloit

1 follow-up statement

543 
WGUS71 KCAR 091054
FFSCAR

Flash Flood Statement
National Weather Service Caribou ME
654 AM EDT Wed Jun 9 2021

MEC029-091104-
/O.CAN.KCAR.FF.W.0001.000000T0000Z-210609T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington ME-
654 AM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL WASHINGTON 
COUNTY...

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

LAT...LON 4469 6754 4468 6749 4466 6744 4465 6742
      4463 6742 4460 6744 4461 6749 4463 6752
      4465 6755

$$

Maloit

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 9:09 PM EDT	Special Weather Statement	CAR	Aroostook	36 min
Jun 9, 4:40 AM EDT	Areal Flood Advisory	CAR	Washington	2 hr
Jun 9, 4:59 AM EDT	Areal Flood Advisory	CAR	Hancock	3 hr
Jun 9, 5:47 AM EDT	Flash Flood Warning	CAR	Hancock	2 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.