Alert archive / New Hampshire / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Boston/Norton, MA

May 29, 2012Cheshire County, New Hampshire

NWS Boston/Norton, MA issued this flash flood warning at May 29, 2012, 4:45 PM EDT for Cheshire County, New Hampshire. It was in force for 3 hr. 14 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 29, 2012, 4:45 PM EDT (20:45 UTC)
Expired: May 29, 2012, 7:45 PM EDT
In force: 3 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Cheshire County, NH

The radar

The Albany radar (KENX), 149 km from the middle of the area, began a volume at 20:46 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.

What was reported inside it

Time	Report	Where	Remark
May 29, 6:10 PM EDT	FLASH FLOOD	Keene, NH	NUMEROUS REPORTS OF FLOODED ROADS IN KEENE
May 29, 6:12 PM EDT	FLASH FLOOD	Keene, NH	CEDAR CREST...PAKO...COLONIAL AND DALE DRIVES FLOODED
May 29, 6:13 PM EDT	FLASH FLOOD	Keene, NH	NUMEROUS REPORTS OF FLOODED ROADS IN KEENE
May 29, 6:30 PM EDT	FLASH FLOOD	Westmoreland, NH	SECTION OF ROAD FLOODED AND IMPASSIBLE ON MOUNT GILBOA ROAD
May 29, 6:31 PM EDT	FLASH FLOOD	Gilsum, NH	ROUTE 10 FLOODED AND IMPASSABLE
May 29, 6:33 PM EDT	FLASH FLOOD	Sullivan, NH	CENTRE STREET ROAD WASHED OUT
May 29, 6:36 PM EDT	FLOOD	Keene, NH	FERRY BROOK OUT OF ITS BANKS
May 29, 6:38 PM EDT	FLASH FLOOD	Keene, NH	HURRICANE ROAD FLOODED
May 29, 6:41 PM EDT	FLASH FLOOD	Alstead, NH	ALSTEAD CENTER ROAD FLOODED AND IMPASSABLE
May 29, 6:48 PM EDT	FLASH FLOOD	Sullivan, NH	SOUTH...HUBBARD AND EAST SULLIVAN ROADS FLOODED
May 29, 6:49 PM EDT	FLASH FLOOD	Gilsum, NH	PORTIONS OF ROUTE 10 AND VESSEL ROCK ROAD WASHED OUT
May 29, 6:53 PM EDT	FLASH FLOOD	Walpole, NH	COUNTY ROAD FLOODING AND IMPASSABLE
May 29, 7:29 PM EDT	FLASH FLOOD	Nelson, NH	MURDOW HILL ROAD FLOODED AND IMPASSABLE
May 29, 7:29 PM EDT	FLASH FLOOD	Surry, NH	ROUTE 12A NEAR CARPENTER ROAD FLOODED AND IMPASSABLE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.8 hours before the alert went out and 127 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: 1908 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

097 
WGUS51 KBOX 292045
FFWBOX
NHC005-292345-
/O.NEW.KBOX.FF.W.0001.120529T2045Z-120529T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
445 PM EDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE...
  THIS INCLUDES THE CITY OF KEENE...

* UNTIL 745 PM EDT

* AT 439 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
TWO TO FOUR INCHES OF RAIN FROM SEVERAL THUNDERSTORMS OVER 
THE NORTHERN CHESHIRE COUNTY AREA. 

FLASH FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW
WHERE YOU ARE RELATIVE TO STREAMS OR RIVERS WHICH CAN BECOME KILLERS
IN HEAVY RAIN. CAMPERS AND HIKERS SHOULD HEAD TO HIGHER GROUND
IMMEDIATELY.

&&

LAT...LON 4318 7216 4314 7217 4313 7204 4296 7206
      4294 7204 4282 7255 4288 7256 4292 7253
      4295 7254 4298 7248 4301 7245 4305 7247
      4308 7245 4315 7245 4316 7243 4314 7242
      4314 7238 4316 7238

$$

DUNTEN/BELK

2 follow-up statements

271 
WGUS71 KBOX 292144
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
544 PM EDT TUE MAY 29 2012

NHC005-292345-
/O.CON.KBOX.FF.W.0001.000000T0000Z-120529T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESHIRE NH-
544 PM EDT TUE MAY 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
NORTHERN CHESHIRE COUNTY...

AT 540 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING HEAVY RAIN OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALPOLE...
SURRY...STODDARD...MARLOW...GILSUM AND ALSTEAD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
TUESDAY EVENING FOR SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4318 7216 4314 7217 4313 7204 4296 7206
      4294 7204 4282 7255 4288 7256 4292 7253
      4295 7254 4298 7248 4301 7245 4305 7247
      4308 7245 4315 7245 4316 7243 4314 7242
      4314 7238 4316 7238

$$

DUNTEN

182 
WGUS71 KBOX 292234
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
634 PM EDT TUE MAY 29 2012

NHC005-292345-
/O.CON.KBOX.FF.W.0001.000000T0000Z-120529T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESHIRE NH-
634 PM EDT TUE MAY 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
NORTHERN CHESHIRE COUNTY...

AT 622 PM EDT...TRAINED WEATHER SPOTTERS REPORTED FLOODED BASEMENTS 
AND NUMEROUS ROADS ARE UNDER WATER IN KEENE NEW HAMPSHIRE. 
THERE CONTINUES TO BE A THUNDERSTORM PRODUCING HEAVY RAIN ACROSS 
NORTHERN CHESHIRE COUNTY IN NEW HAMPSHIRE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WALPOLE...
SURRY...STODDARD...MARLOW...GILSUM AND ALSTEAD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA.

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 4318 7216 4314 7217 4313 7204 4296 7206
      4294 7204 4282 7255 4288 7256 4292 7253
      4295 7254 4298 7248 4301 7245 4305 7247
      4308 7245 4315 7245 4316 7243 4314 7242
      4314 7238 4316 7238

$$

DUNTEN

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 3:04 PM EDT	Special Weather Statement	BOX	Cheshire	41 min
May 29, 3:16 PM EDT	Special Weather Statement	BOX	Cheshire	44 min
May 29, 3:19 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire	41 min
May 29, 3:30 PM EDT	Tornado Warning	BOX	Cheshire	45 min
May 29, 3:42 PM EDT	Special Weather Statement	BOX	Cheshire	48 min
May 29, 3:51 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	54 min
May 29, 4:24 PM EDT	Areal Flood Advisory	BOX	Cheshire, Hillsborough	3 hr
May 29, 4:37 PM EDT	Tornado Warning	BOX	Cheshire	38 min
May 29, 5:09 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	66 min
May 29, 6:13 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	62 min
May 29, 6:39 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire	66 min
May 29, 7:09 PM EDT	Severe Thunderstorm Warning	BOX	Cheshire, Hillsborough	25 min
May 29, 7:32 PM EDT	Areal Flood Advisory	BOX	Hillsborough	3 hr
May 29, 7:44 PM EDT	Areal Flood Warning	BOX	Cheshire	6 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.