Alert archive / Maine / Flash Flood Warnings in 2023

Flash Flood Warning 71, NWS Gray, ME

July 29, 2023Cumberland County, Maine

NWS Gray, ME issued this flash flood warning at Jul 29, 2023, 5:07 PM EDT for Cumberland County, Maine. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 29, 2023, 5:07 PM EDT (21:07 UTC)
Expired: Jul 29, 2023, 8:15 PM EDT
In force: 3 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

County Cumberland County, ME

The radar

The Portland,ME radar (KGYX), 11 km from the middle of the area, began a volume at 21:08 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.

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 9.1 hours before the alert went out and 11 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: 134 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before this flash flood warning went out at Jul 29, 4:15 PM EDT, 52 minutes earlier.

Area forecast discussion, Jul 29, 4:15 PM EDT, 52 minutes before

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Hazardous weather outlook, Jul 29, 2:28 PM EDT, 2 hours 39 minutes before

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In the hours before

Special weather statement, Jul 29, 2:40 PM EDT, 2 hours 27 minutes before

Special Weather Statement
National Weather Service Gray ME
240 PM EDT Sat Jul 29 2023

NHZ008-009-291915-
Merrimack NH-Belknap NH-
240 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of west central Belknap
and central Merrimack Counties through 315 PM EDT...

At 240 PM EDT, Doppler radar was tracking a strong thunderstorm near
Warner, or 9 miles north of Henniker, moving east at 10 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Concord, Franklin, Henniker, Hopkinton, Loudon, Canterbury, Bradford,
Warner, Boscawen, Andover, Tilton, Webster, Salisbury, Northfield,
Sulton, Sanbornton and Wilmot.

This includes the following highways...
 Interstate 89 between mile markers 12 and 27.
 Interstate 93 between mile markers 40 and 60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central New Hampshire.

&&

LAT...LON 4321 7192 4337 7193 4351 7159 4323 7148
TIME...MOT...LOC 1840Z 257DEG 9KT 4330 7175

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Legro

Special weather statement, Jul 29, 2:42 PM EDT, 2 hours 25 minutes before

Special Weather Statement
National Weather Service Gray ME
242 PM EDT Sat Jul 29 2023

MEZ018-019-024-291915-
Interior York ME-Central Interior Cumberland ME-
Coastal Cumberland ME-
242 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of north central York
and central Cumberland Counties through 315 PM EDT...

At 242 PM EDT, Doppler radar was tracking a strong thunderstorm near
Standish, or 11 miles northwest of Westbrook, moving east at 10 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Naples, Cumberland, Gorham, Falmouth, Gray, Raymond, Standish, Casco,
Limington, Frye Island, Windham, Sebago, New Gloucester, Baldwin and
North Yarmouth.

This includes Interstate 95 between mile markers 54 and 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southwestern Maine.

&&

LAT...LON 4375 7073 4393 7065 4399 7030 4375 7027
TIME...MOT...LOC 1842Z 257DEG 9KT 4382 7050

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Legro

Local storm report, Jul 29, 2:47 PM EDT, 2 hours 20 minutes before

Preliminary Local Storm Report
National Weather Service Gray ME
247 PM EDT Sat Jul 29 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0216 PM     Hail             3 NNW Bedford           42.99N 71.52W
07/29/2023  M1.25 inch       Hillsborough       NH   Trained Spotter

            Reported by Weather Spotter. 1.25 inch hail
            reported near St Anselm College. Time
            estimated by radar.

&&

Palmer

Local storm report, Jul 29, 3:11 PM EDT, 1 hour 56 minutes before

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Local storm report, Jul 29, 3:18 PM EDT, 1 hour 49 minutes before

Preliminary Local Storm Report
National Weather Service Gray ME
318 PM EDT Sat Jul 29 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0316 PM     Rain             2 SSW East Baldwin      43.78N 70.70W
07/29/2023  M2.91 inch       York               ME   Trained Spotter

&&

Palmer

Special weather statement, Jul 29, 3:25 PM EDT, 1 hour 42 minutes before

Special Weather Statement
National Weather Service Gray ME
325 PM EDT Sat Jul 29 2023

NHZ008>010-013-292000-
Merrimack NH-Belknap NH-Strafford NH-Interior Rockingham NH-
325 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of north central
Rockingham, western Strafford, southeastern Belknap and east central
Merrimack Counties through 400 PM EDT...

At 325 PM EDT, Doppler radar was tracking a strong thunderstorm over
Loudon, or near Concord, moving east at 30 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Concord, Northwood, Barrington, Farmington, Loudon, Alton, Barnstead,
Epsom, Gilmanton, Canterbury, Deerfield, Boscawen, Chichester,
Strafford, Pittsfield, New Durham, Pembroke and Middleton.

This includes Interstate 93 between mile markers 38 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central and southern New Hampshire.

&&

LAT...LON 4319 7163 4336 7166 4349 7110 4319 7104
TIME...MOT...LOC 1925Z 255DEG 25KT 4329 7146

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Legro

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 7:34 AM EDT	Flood Watch	GYX	Androscoggin, Cumberland, Kennebec, Oxford, Sagadahoc, York	14 hr
Jul 29, 1:31 PM EDT	Severe Thunderstorm Warning	GYX	Oxford	30 min
Jul 29, 1:58 PM EDT	Special Weather Statement	GYX	Cumberland	62 min
Jul 29, 2:42 PM EDT	Special Weather Statement	GYX	Cumberland	33 min
Jul 29, 3:00 PM EDT	Flash Flood Warning	GYX	Cumberland, York	5 hr
Jul 29, 3:54 PM EDT	Small Craft Advisory	GYX		16 hr
Jul 29, 5:03 PM EDT	Flash Flood Warning	GYX	Oxford	3 hr
Jul 29, 5:30 PM EDT	Flash Flood Warning	GYX	Androscoggin, Cumberland, Sagadahoc	6 hr
Jul 29, 6:33 PM EDT	Areal Flood Advisory	GYX	Kennebec, Lincoln, Sagadahoc	6 hr
Jul 29, 7:56 PM EDT	Areal Flood Advisory	GYX	Oxford	2 hr
Jul 29, 1:29 PM EDT	Special Weather Statement	GYX	Carroll	31 min
Jul 29, 1:57 PM EDT	Special Weather Statement	GYX	Rockingham	48 min
Jul 29, 2:11 PM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Merrimack, Rockingham, Strafford	39 min
Jul 29, 2:40 PM EDT	Special Weather Statement	GYX	Merrimack	35 min
Jul 29, 2:42 PM EDT	Areal Flood Advisory	GYX	Cheshire, Merrimack, Sullivan	2 hr
Jul 29, 3:25 PM EDT	Flash Flood Warning	GYX	Merrimack	5 hr
Jul 29, 3:25 PM EDT	Special Weather Statement	GYX	Belknap	35 min
Jul 29, 3:54 PM EDT	Areal Flood Advisory	GYX	Belknap, Carroll, Merrimack, Strafford	5 hr
Jul 29, 4:26 PM EDT	Flash Flood Warning	GYX	Belknap, Carroll, Strafford	4 hr
Jul 29, 5:19 PM EDT	Flash Flood Warning	GYX	Cheshire	2 hr
Jul 29, 7:04 PM EDT	Areal Flood Advisory	GYX	Hillsborough, Rockingham	3 hr

Nearby

Flash Flood Warnings in Maine, 2023 Every flash flood warning in 2023

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.