Alert archive / Massachusetts / Flash Flood Warnings in 2011
Flash Flood Warning 5, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Aug 1, 2011, 1:41 PM EDT for Franklin County, Hampshire County, Worcester County, Massachusetts. 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 outline as issued.
The facts
- Issued
- Aug 1, 2011, 1:41 PM EDT (17:41 UTC)
- Expired
- Aug 1, 2011, 4:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Franklin County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 119 km from the middle of the area, began a volume at 17:41 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, 5.7 hours before the alert went out and 117 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.
- Mixed-layer CAPE
- 1159 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 824 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
312 WGUS51 KBOX 011741 FFWBOX MAC011-015-027-012045- /O.NEW.KBOX.FF.W.0005.110801T1741Z-110801T2045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TAUNTON MA 141 PM EDT MON AUG 1 2011 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME WEST CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS... SOUTHEASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS... EASTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS... THIS INCLUDES THE CITY OF AMHERST... * UNTIL 445 PM EDT * AT 137 PM EDT...A THUNDERSTORM CAPABLE OF PRODUCING FLASH FLOODING WAS NEARLY STATIONARY OVER THE WARNED AREA. THIS INCLUDES BUT IS NOT LIMITED TO THE COMMUNITIES OF AMHERST...LEVERETT AND SHUTESBURY. RADAR ESTIMATES THAT UP TO 3 INCHES OF RAIN HAS FALLEN WITH THIS THUNDERSTORM. ADDITIONAL HEAVY RAINS ARE ANTICIPATED...WITH FLASH FLOODING EXPECTED. THE MAIN THREAT IS URBAN FLASH FLOODING AND QUICK AND SUBSTANTIAL PONDING OF WATER IN LOW LYING AND POOR DRAINAGE AREAS. HOWEVER...SOME SMALL STREAM FLASH FLOODING IS ALSO POSSIBLE. FLASH FLOODING OF SMALL STREAMS AND URBAN AREAS IS OCCURRING OR IMMINENT. THOSE NEAR STREAMS AND CREEKS...OR IN AREAS PRONE TO FLOODING SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. AVOID FLOODED ROADS. THE WATER MAY BE TOO DEEP TO ALLOW VEHICLES TO CROSS SAFELY... OR THE ROADWAY MAY BE UNDERMINED. TURN AROUND...DONT DROWN! && LAT...LON 4248 7255 4247 7228 4224 7233 4229 7259 $$ NMB
3 follow-up statements
061 WGUS71 KBOX 011802 FFSBOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 202 PM EDT MON AUG 1 2011 MAC011-015-027-012045- /O.CON.KBOX.FF.W.0005.000000T0000Z-110801T2045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WORCESTER MA-FRANKLIN MA-HAMPSHIRE MA- 202 PM EDT MON AUG 1 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR EASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND EXTREME WEST CENTRAL WORCESTER COUNTIES... AT 155 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF THUNDERSTORMS OVER THE WARNING AREA. THE STORM PRODUCING THE HEAVIEST RAIN HAD SLID SOUTH INTO THE SOUTHERN SECTIONS OF AMHERST...AS WELL AS BELCHERTOWN AND VICINITY. HOWEVER...ADDITIONAL LOCALLY HEAVY RAINS WERE ALSO OCCURRING JUST TO THE NORTH. LOCALLY HEAVY RAINS ARE EXPECTED IN THE WARNING AREA THROUGH 230 PM...AND AS A RESULT FLASH FLOODING IS EXPECTED. THE MAIN THREAT IS URBAN FLASH FLOODING AND QUICK AND SUBSTANTIAL PONDING OF WATER IN LOW LYING AND POOR DRAINAGE AREAS. HOWEVER...SOME SMALL STREAM FLASH FLOODING IS ALSO POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. && LAT...LON 4248 7255 4247 7228 4224 7233 4229 7259 $$ NMB
656 WGUS71 KBOX 011840 FFSBOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 240 PM EDT MON AUG 1 2011 MAC011-015-027-012045- /O.CON.KBOX.FF.W.0005.000000T0000Z-110801T2045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WORCESTER MA-FRANKLIN MA-HAMPSHIRE MA- 240 PM EDT MON AUG 1 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR EASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND EXTREME WEST CENTRAL WORCESTER COUNTIES... AT 232 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THAT THUNDERSTORMS WERE AFFECTING THE LEVERETT TO AMHERST AREA AND NEARBY COMMUNITIES. THESE STORMS ARE EXPECTED TO TRACK SOUTHEASTWARD THROUGH THE WARNING AREA THROUGH 3 PM. THE LOCALIZED HEAVY RAINS WILL BRING A CONTINUED THREAT FOR FLASH FLOODING. THE MAIN THREAT IS SIGNIFICANT POOR DRAINAGE FLOODING...HOWEVER SMALL STREAM FLASH FLOODING IS ALSO A THREAT. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SHUTESBURY... PELHAM...LEVERETT AND AMHERST PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT MONDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND. && LAT...LON 4248 7255 4247 7228 4224 7233 4229 7259 $$ NMB
282 WGUS71 KBOX 011932 FFSBOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 332 PM EDT MON AUG 1 2011 MAC011-015-027-012045- /O.CON.KBOX.FF.W.0005.000000T0000Z-110801T2045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WORCESTER MA-FRANKLIN MA-HAMPSHIRE MA- 332 PM EDT MON AUG 1 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR EASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND EXTREME WEST CENTRAL WORCESTER COUNTIES... AT 327 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED AREA. THE STRONGEST THUNDERSTORM WAS OVER THE BELCHERTOWN AREA...MOVING SLOWLY SOUTHEASTWARD. THIS STORM IS CAPABLE OF PRODUCING TORRENTIAL RAINS. AS A RESULT...FLASH FLOODING REMAINS A THREAT. TO THE NORTHWEST...RECENT HEAVY RAINS MAY ALLOW FOR A CONTINUED PERIOD OF SIGNIFICANT PONDING OF WATER IN LOW LYING AND POOR DRAINAGE AREAS. SOME SMALL STREAMS MAY ALSO RISE OUT OF THEIR BANKS. THERE IS THE POSSIBILITY THAT ADDITIONAL THUNDERSTORMS MAY AFFECT THE AREA AS THE LATE AFTERNOON AND EARLY EVENING WEAR ON. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SHUTESBURY... PELHAM...LEVERETT AND AMHERST. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT MONDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND. && LAT...LON 4248 7255 4247 7228 4224 7233 4229 7259 $$ NMB
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 12:37 PM EDT | Special Weather Statement | BOX | Hampshire | 53 min |
| Aug 1, 1:24 PM EDT | Special Weather Statement | BOX | Hampshire | 51 min |
| Aug 1, 1:27 PM EDT | Areal Flood Advisory | BOX | Franklin, Hampshire, Worcester | 3 hr |
| Aug 1, 1:34 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 19 min |
| Aug 1, 1:55 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 35 min |
| Aug 1, 2:03 PM EDT | Special Weather Statement | BOX | Franklin | 42 min |
| Aug 1, 2:08 PM EDT | Special Weather Statement | BOX | Hampden | 52 min |
| Aug 1, 2:13 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 47 min |
| Aug 1, 2:19 PM EDT | Flash Flood Warning | BOX | Hampden, Hampshire, Worcester | 116 min |
| Aug 1, 2:19 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire | 41 min |
| Aug 1, 3:01 PM EDT | Special Weather Statement | BOX | Worcester | 59 min |
| Aug 1, 3:05 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 17 min |
| Aug 1, 3:10 PM EDT | Special Weather Statement | BOX | Franklin | 50 min |
| Aug 1, 3:14 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 38 min |
| Aug 1, 3:18 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 42 min |
| Aug 1, 3:30 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 45 min |
| Aug 1, 3:33 PM EDT | Special Weather Statement | BOX | Hampden | 57 min |
| Aug 1, 3:40 PM EDT | Areal Flood Advisory | BOX | Franklin, Worcester | 113 min |
| Aug 1, 3:41 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 49 min |
| Aug 1, 3:59 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 61 min |
| Aug 1, 4:07 PM EDT | Flash Flood Warning | BOX | Franklin, Worcester | 82 min |
| Aug 1, 4:08 PM EDT | Special Weather Statement | BOX | Essex | 67 min |
| Aug 1, 4:15 PM EDT | Areal Flood Advisory | BOX | Hampden | 3 hr |
| Aug 1, 4:31 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 27 min |
| Aug 1, 4:37 PM EDT | Special Weather Statement | BOX | Franklin | 23 min |
| Aug 1, 4:42 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 63 min |
| Aug 1, 4:55 PM EDT | Areal Flood Advisory | BOX | Franklin, Hampshire, Worcester | 3 hr |
| Aug 1, 5:29 PM EDT | Special Weather Statement | BOX | Franklin | 31 min |
| Aug 1, 6:29 PM EDT | Special Weather Statement | BOX | Hampshire | 46 min |
Nearby
Flash Flood Warnings in Massachusetts, 2011Every flash flood warning in 2011
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.