Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 9, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 25, 2014, 6:30 PM EDT for Hillsborough County, New Hampshire; Middlesex County, Worcester County, Massachusetts. It was in force for 30 min. 3 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 25, 2014, 6:30 PM EDT (22:30 UTC)
- Expired
- May 25, 2014, 7:00 PM EDT
- In force
- 30 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Worcester County, MA, Hillsborough County, NH
The radar
The Boston radar (KBOX), 94 km from the middle of the area, began a volume at 22:32 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 25, 6:30 PM EDT | HAIL 0.75 | Brookline, NH | |
| May 25, 6:50 PM EDT | HAIL 1 | Brookline, NH | |
| May 25, 7:02 PM EDT | HAIL 1 | Pepperell, MA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 10.5 hours before the alert went out and 169 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
- 619 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
598 WUUS51 KBOX 252230 SVRBOX MAC017-027-NHC011-252300- /O.NEW.KBOX.SV.W.0009.140525T2230Z-140525T2300Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 630 PM EDT SUN MAY 25 2014 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS... NORTHWESTERN MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS... SOUTH CENTRAL HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE... * UNTIL 700 PM EDT * AT 630 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR HOLLIS...OR NEAR MERRIMACK...AND WAS MOVING SOUTH AT 25 MPH. * SOME LOCATIONS IMPACTED INCLUDE... NASHUA...CHELMSFORD...MERRIMACK...HUDSON...WESTFORD...MILFORD... PEPPERELL...TYNGSBOROUGH...AMHERST...GROTON...LUNENBURG... TOWNSEND...LITTLETON...LITCHFIELD...LANCASTER...HOLLIS...AYER... SHIRLEY...HARVARD AND BROOKLINE. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL. GO INDOORS AND STAY AWAY FROM WINDOWS. DRIVERS SHOULD PREPARE FOR LOW VISIBILITY AND AVOID FLOODED ROADS. && LAT...LON 4286 7173 4289 7150 4255 7135 4250 7171 TIME...MOT...LOC 2230Z 349DEG 22KT 4279 7160 $$ RLG
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 3:03 PM EDT | Severe Thunderstorm Warning | BOX | Cheshire, Hillsborough | 27 min |
| May 25, 5:12 PM EDT | Severe Thunderstorm Warning | BOX | Hillsborough | 48 min |
| May 25, 5:57 PM EDT | Severe Thunderstorm Warning | BOX | Hillsborough | 33 min |
| May 25, 6:57 PM EDT | Severe Thunderstorm Warning | BOX | Hillsborough | 48 min |
| May 25, 1:07 PM EDT | Special Weather Statement | BOX | Worcester | 83 min |
| May 25, 1:42 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 33 min |
| May 25, 2:15 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 30 min |
| May 25, 3:25 PM EDT | Special Marine Warning | BOX | 95 min | |
| May 25, 4:45 PM EDT | Small Craft Advisory | BOX | 37 hr | |
| May 25, 7:40 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 50 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2014Severe Thunderstorm Warnings in New Hampshire, 2014Every severe thunderstorm warning in 2014
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.