Alert archive / New Hampshire / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Gray, ME

May 29, 2012Coos County, New Hampshire

NWS Gray, ME issued this flash flood warning at May 29, 2012, 4:39 PM EDT for Coos County, New Hampshire. It was in force for 6 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: May 29, 2012, 4:39 PM EDT (20:39 UTC)
Expired: May 29, 2012, 10:45 PM EDT
In force: 6 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

County Coos County, NH

The radar

The Portland,ME radar (KGYX), 120 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 120 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 426 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 305 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

544 
WGUS51 KGYX 292039
FFWGYX
NHC007-292345-
/O.NEW.KGYX.FF.W.0002.120529T2039Z-120529T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAY ME
439 PM EDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN GRAY MAINE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN COOS COUNTY IN NORTHERN NEW HAMPSHIRE...

* UNTIL 745 PM EDT

* AT 434 PM EDT...VERY HEAVY RAIN WAS FALLING FROM THUNDERSTORMS     
  OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ERROL...
  DIXVILLE NOTCH AND COLEBROOK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

PLEASE REPORT HIGH WATER TO THE NATIONAL WEATHER SERVICE BY CALLING
TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 4456 7154 4474 7161 4490 7150 4485 7105
      4435 7102 4424 7141 4438 7173

$$

TFH

1 follow-up statement

524 
WGUS51 KGYX 292323
FFWGYX
NHC007-300245-
/O.EXT.KGYX.FF.W.0002.000000T0000Z-120530T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAY ME
723 PM EDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN GRAY MAINE HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTHERN COOS COUNTY IN NORTHERN NEW HAMPSHIRE...

* UNTIL 1045 PM EDT

* AT 716 PM EDT...ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS EXPECTED 
OVER THE NEXT HOUR OR TWO OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAKE
  UMBAGOG NATIONAL WILDLIFE REFUGE...STRATFORD...NORTH STRATFORD...
  ERROL...DIXVILLE NOTCH AND COLEBROOK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 4456 7154 4474 7161 4490 7150 4485 7105
      4435 7102 4424 7141 4438 7173

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 12:39 AM EDT	Special Weather Statement	GYX	Sullivan	51 min
May 29, 1:01 AM EDT	Severe Thunderstorm Warning	GYX	Grafton	44 min
May 29, 1:14 AM EDT	Special Weather Statement	GYX	Carroll	46 min
May 29, 1:18 AM EDT	Special Weather Statement	GYX	Grafton	42 min
May 29, 1:24 AM EDT	Severe Thunderstorm Warning	GYX	Grafton	51 min
May 29, 1:32 AM EDT	Special Weather Statement	GYX	Sullivan	43 min
May 29, 1:37 AM EDT	Severe Thunderstorm Warning	GYX	Grafton	38 min
May 29, 1:40 AM EDT	Special Weather Statement	GYX	Carroll	50 min
May 29, 1:49 AM EDT	Special Weather Statement	GYX	Belknap	41 min
May 29, 2:01 AM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	44 min
May 29, 2:24 AM EDT	Areal Flood Advisory	GYX	Belknap, Carroll, Coos, Grafton	2 hr
May 29, 2:31 AM EDT	Special Weather Statement	GYX	Carroll	44 min
May 29, 2:39 AM EDT	Severe Thunderstorm Warning	GYX	Carroll, Grafton	40 min
May 29, 3:18 AM EDT	Special Weather Statement	GYX	Carroll	42 min
May 29, 3:27 AM EDT	Special Weather Statement	GYX	Grafton	48 min
May 29, 3:45 AM EDT	Special Weather Statement	GYX	Carroll	60 min
May 29, 4:35 AM EDT	Special Weather Statement	GYX	Coos	40 min
May 29, 5:56 AM EDT	Special Weather Statement	GYX	Coos	49 min
May 29, 6:43 AM EDT	Flash Flood Watch	GYX	Carroll, Coos, Grafton	17 hr
May 29, 6:46 AM EDT	Special Weather Statement	GYX	Coos	44 min
May 29, 6:47 AM EDT	Special Weather Statement	GYX	Grafton	43 min
May 29, 8:52 AM EDT	Special Weather Statement	GYX	Carroll	38 min
May 29, 9:38 AM EDT	Special Weather Statement	GYX	Carroll, Grafton	52 min
May 29, 9:47 AM EDT	Flash Flood Warning	GYX	Coos	3 hr
May 29, 9:49 AM EDT	Special Weather Statement	GYX	Grafton	56 min
May 29, 3:21 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	39 min
May 29, 3:56 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Sullivan	49 min
May 29, 4:25 PM EDT	Special Weather Statement	GYX	Grafton	50 min
May 29, 4:29 PM EDT	Special Weather Statement	GYX	Coos	61 min
May 29, 4:49 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Merrimack, Sullivan	20 min
May 29, 4:50 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton, Merrimack	55 min
May 29, 4:51 PM EDT	Flash Flood Warning	GYX	Carroll, Coos, Grafton	6 hr
May 29, 5:24 PM EDT	Special Weather Statement	GYX	Belknap, Merrimack	51 min
May 29, 5:43 PM EDT	Special Weather Statement	GYX	Carroll	47 min
May 29, 6:35 PM EDT	Special Weather Statement	GYX	Merrimack	25 min
May 29, 6:37 PM EDT	Areal Flood Advisory	GYX	Merrimack, Sullivan	3 hr

Nearby

Flash Flood Warnings in New Hampshire, 2012 Every flash flood warning in 2012

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.