Alert archive / New Hampshire / Flash Flood Watches in 2017

Flash Flood Watch 5, NWS Gray, ME

October 30, 2017Coos County, New Hampshire

NWS Gray, ME issued this flash flood watch at Oct 30, 2017, 6:47 PM EDT for Coos County, New Hampshire. It took effect at Oct 30, 2017, 7:00 PM EDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Oct 30, 2017, 6:47 PM EDT (22:47 UTC)
In effect from
Oct 30, 2017, 7:00 PM EDT
Expired
Oct 31, 2017, 9:40 AM EDT
In force
15 hr
Issued by
NWS Gray, ME

County Coos County, NH

The radar

The Portland,ME radar (KGYX), 122 km from the middle of the area, began a volume at 22:52 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

Albany, NY (KALY), launched 12:00Z, 10.8 hours before the alert went out and 301 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-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2017-10-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2017-10-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -213 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
859 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-213 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Oct 30, 6:16 PM EDT, 31 minutes earlier.

Area forecast discussion, Oct 30, 6:16 PM EDT, 31 minutes before
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Hazardous weather outlook, Oct 30, 6:07 PM EDT, 40 minutes before
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In the hours before

Special weather statement, Oct 30, 1:01 PM EDT, 5 hours 46 minutes before
Special Weather Statement
National Weather Service Gray ME
101 PM EDT MON OCT 30 2017

MEZ007-008-012-013-NHZ002-004-301800-
Northern Oxford-Southern Oxford-Southern Franklin-Northern
Franklin-Southern Coos-Northern Carroll-
101 PM EDT MON OCT 30 2017

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL OXFORD...
SOUTHWESTERN FRANKLIN AND EAST CENTRAL COOS COUNTIES...

At 100 PM EDT, a strong thunderstorm was located near Bethel, moving
northeast at 40 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Berlin, Bethel, Rumford, Rangeley, Andover, Grafton, Weld, Mexico,
Gorham, Lovell, Chatham, Hanover, Gilead, Byron, South Arm, Riley,
Rangeley Plantation, Roxbury, Mason and Batchelders Grant.

This also includes...
  Speckled Mountain, Old Speck Mountain, Grafton Notch, Evans Notch,
and Moose Brook State Park.

Torrential rainfall is also occurring with this storm, and may cause
additional localized flooding. Do not drive your vehicle through
flooded roadways.

LAT...LON 4442 7127 4494 7077 4472 7044 4421 7094
TIME...MOT...LOC 1700Z 211DEG 36KT 4447 7088

MBC
Local storm report, Oct 30, 1:38 PM EDT, 5 hours 9 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Gray ME
138 PM EDT MON OCT 30 2017

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

0600 AM     NON-TSTM WND GST 2 WSW CUMBERLAND        43.79N  70.30W
10/30/2017  M50 MPH          CUMBERLAND         ME   TRAINED SPOTTER

&&

EVENT NUMBER GYX1704326

ES
Local storm report, Oct 30, 2:47 PM EDT, 4 hours before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Gray ME
247 PM EDT MON OCT 30 2017

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

0230 PM     NON-TSTM WND DMG 4 WSW LOVELL            44.10N  70.96W
10/30/2017                   OXFORD             ME   AMATEUR RADIO

            TREES DOWN ON FISH STREET CLOSING ROAD.

&&

EVENT NUMBER GYX1704327

ES
Local storm report, Oct 30, 4:12 PM EDT, 2 hours 35 minutes before
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Local storm report, Oct 30, 5:25 PM EDT, 1 hour 22 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 30, 1:19 AM EDTAreal Flood WarningGYXYork6 hr
Oct 30, 4:21 AM EDTFlash Flood WarningGYXCumberland, Oxford6 hr
Oct 30, 9:52 AM EDTGale WarningGYX17 hr
Oct 30, 11:58 AM EDTAreal Flood WarningGYXFranklin, Oxford, Somerset6 hr
Oct 30, 1:01 PM EDTSpecial Weather StatementGYXOxford59 min
Oct 30, 1:15 PM EDTRiver Flood WarningGYXOxford25 hr
Oct 30, 2:00 PM EDTRiver Flood WarningGYXSomerset8 hr
Oct 30, 6:08 PM EDTSmall Craft AdvisoryGYX35 hr
Oct 30, 2:05 AM EDTRiver Flood WarningGYXGrafton36 hr
Oct 30, 2:55 AM EDTFlash Flood WarningGYXBelknap, Carroll, Coos, Grafton6 hr
Oct 30, 4:04 AM EDTFlash Flood WarningGYXBelknap, Carroll, Coos, Grafton6 hr
Oct 30, 4:09 AM EDTRiver Flood WarningGYXHillsborough19 hr
Oct 30, 5:31 AM EDTRiver Flood WarningGYXMerrimack60 hr
Oct 30, 5:54 AM EDTRiver Flood WarningGYXBelknap, Grafton, Merrimack10 hr
Oct 30, 5:57 AM EDTRiver Flood WarningGYXCheshire, Hillsborough20 hr
Oct 30, 6:14 AM EDTRiver Flood WarningGYXGrafton14 hr
Oct 30, 8:53 AM EDTAreal Flood WarningGYXBelknap, Carroll, Coos, Grafton6 hr
Oct 30, 10:36 AM EDTRiver Flood WarningGYXCoos11 hr
Oct 30, 11:48 AM EDTRiver Flood WarningGYXGrafton7 hr
Oct 30, 2:00 PM EDTRiver Flood WarningGYXHillsborough10 hr
Oct 30, 2:48 PM EDTRiver Flood WarningGYXMerrimack29 hr

Nearby

Flash Flood Watches in New Hampshire, 2017Every flash flood watch in 2017

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.