Alert archive / Massachusetts / Flash Flood Warnings in 2021
Flash Flood Warning 14, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Jul 17, 2021, 6:04 PM EDT for Hampden County, Hampshire 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
- Jul 17, 2021, 6:04 PM EDT (22:04 UTC)
- Expired
- Jul 17, 2021, 9:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hampden County, MA, Hampshire County, MA
The radar
The Albany radar (KENX), 101 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 89 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 958 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
150
WGUS51 KBOX 172204
FFWBOX
MAC013-015-180115-
/O.NEW.KBOX.FF.W.0014.210717T2204Z-210718T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
604 PM EDT Sat Jul 17 2021
The National Weather Service in Norton has issued a
* Flash Flood Warning for...
Northwestern Hampden County in western Massachusetts...
Southwestern Hampshire County in western Massachusetts...
* Until 915 PM EDT.
* At 604 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Holyoke, Northampton, South Hadley, Easthampton, Southampton,
Hadley, Hatfield, Williamsburg, Huntington, Russell, Westhampton,
Chester, Blandford, Chesterfield, Montgomery and Tolland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4215 7306 4217 7303 4222 7301 4225 7301
4225 7300 4228 7300 4230 7300 4237 7273
4235 7261 4226 7259 4221 7278 4215 7303
4215 7305 4214 7307 4215 7307
FLASH FLOOD...RADAR INDICATED
$$
BL2 follow-up statements
442
WGUS71 KBOX 172317 RRA
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
717 PM EDT Sat Jul 17 2021
MAC013-015-180115-
/O.CON.KBOX.FF.W.0014.000000T0000Z-210718T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hampden MA-Hampshire MA-
717 PM EDT Sat Jul 17 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT THIS
EVENING FOR NORTHWESTERN HAMPDEN AND SOUTHWESTERN HAMPSHIRE
COUNTIES...
At 717 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Northampton, Easthampton, Southampton, Hadley, Hatfield,
Huntington, Russell, Westhampton, Chester, Blandford and
Montgomery.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4219 7302 4222 7301 4223 7301 4225 7301
4225 7300 4228 7300 4230 7293 4236 7274
4235 7261 4230 7262 4224 7279 4218 7295
4217 7303
FLASH FLOOD...RADAR INDICATED
$$
BL406
WGUS71 KBOX 180111
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
911 PM EDT Sat Jul 17 2021
MAC013-015-180121-
/O.EXP.KBOX.FF.W.0014.000000T0000Z-210718T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hampden MA-Hampshire MA-
911 PM EDT Sat Jul 17 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM EDT THIS EVENING FOR
NORTHWESTERN HAMPDEN AND SOUTHWESTERN HAMPSHIRE COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 600 AM EDT Sunday for
portions of northern Connecticut and Massachusetts.
LAT...LON 4219 7302 4222 7301 4223 7301 4225 7301
4225 7300 4228 7300 4230 7293 4236 7274
4235 7261 4230 7262 4224 7279 4218 7295
4217 7303
$$
BLThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 2:37 PM EDT | Special Weather Statement | BOX | Franklin | 38 min |
| Jul 17, 2:45 PM EDT | Special Weather Statement | BOX | Plymouth | 45 min |
| Jul 17, 2:53 PM EDT | Special Weather Statement | BOX | Hampshire | 52 min |
| Jul 17, 2:53 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk | 52 min |
| Jul 17, 3:36 PM EDT | Areal Flood Warning | BOX | Bristol | 114 min |
| Jul 17, 4:05 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 34 min |
| Jul 17, 4:15 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 60 min |
| Jul 17, 4:34 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 36 min |
| Jul 17, 4:38 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 67 min |
| Jul 17, 4:48 PM EDT | Flash Flood Warning | BOX | Worcester | 3 hr |
| Jul 17, 4:58 PM EDT | Flash Flood Warning | BOX | Hampden | 2 hr |
| Jul 17, 5:10 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 65 min |
| Jul 17, 5:34 PM EDT | Special Weather Statement | BOX | Hampshire | 41 min |
| Jul 17, 5:35 PM EDT | Flash Flood Warning | BOX | Hampden, Hampshire | 3 hr |
| Jul 17, 6:05 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 26 min |
| Jul 17, 7:49 PM EDT | Areal Flood Warning | BOX | Hampden, Worcester | 116 min |
Nearby
Flash Flood Warnings in Massachusetts, 2021Every flash flood warning in 2021
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.