Alert archive / New Hampshire / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Gray, ME

July 26, 2009York County, Maine; 5 counties in New Hampshire

NWS Gray, ME issued this flash flood watch at Jul 26, 2009, 3:35 PM EDT for York County, Maine; 5 counties in New Hampshire. It took effect at Jul 26, 2009, 5:00 PM EDT. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 26, 2009, 3:35 PM EDT (19:35 UTC)
In effect from: Jul 26, 2009, 5:00 PM EDT
Expired: Jul 26, 2009, 7:04 PM EDT
In force: 2 hr
Issued by: NWS Gray, ME
Flood severity: None

Counties York County, ME, Belknap County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH

The radar

The Portland,ME radar (KGYX), 109 km from the middle of the area, began a volume at 19:39 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, 7.6 hours before the alert went out and 109 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: 16 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 113 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 Jul 26, 4:13 AM EDT, 11 hours 22 minutes earlier.

Area forecast discussion, Jul 26, 4:13 AM EDT, 11 hours 22 minutes before

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Hazardous weather outlook, Jul 26, 9:42 AM EDT, 5 hours 53 minutes before

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In the hours before

Special weather statement, Jul 26, 3:11 PM EDT, 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
311 PM EDT SUN JUL 26 2009

MEZ012-019-262000-
INTERIOR CUMBERLAND-SOUTHERN OXFORD-
311 PM EDT SUN JUL 26 2009

...STRONG THUNDERSTORMS WILL IMPACT OXFORD COUNTY AND CUMBERLAND
COUNTY THROUGH 400 PM EDT...

AT 311 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS CENTERED 2 MILES SOUTH OF FRYEBURG...
MOVING NORTHEAST AT 25 MPH. THIS CLUSTER OF STRONG THUNDERSTORMS WILL
AFFECT AREAS IN AND AROUND FRYEBURG...LOVELL...WEST BRIDGTON...
SWEDEN...BRIDGTON AND HARRISON THROUGH 400 PM EDT.

HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 4:37 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland	38 min
Jul 26, 4:42 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin	48 min
Jul 26, 5:23 PM EDT	Small Craft Advisory	GYX		9 hr
Jul 26, 5:43 PM EDT	Special Marine Warning	GYX		62 min
Jul 26, 5:52 PM EDT	Severe Thunderstorm Warning	GYX	Kennebec, Somerset	38 min

Nearby

Flash Flood Watches in New Hampshire, 2009 Flash Flood Watches in Maine, 2009 Every flash flood watch in 2009

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.