Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 21, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 24, 2009, 5:14 PM EDT for Middlesex County, Norfolk County, Worcester County, Massachusetts. It was in force for 31 min. 5 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 24, 2009, 5:14 PM EDT (21:14 UTC)
- Expired
- May 24, 2009, 5:45 PM EDT
- In force
- 31 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Norfolk County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 35 km from the middle of the area, began a volume at 21:15 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 24, 5:15 PM EDT | HAIL 1 | Hopkinton, MA | |
| May 24, 5:16 PM EDT | HAIL 0.88 | Milford, MA | RELAYED FROM OKX |
| May 24, 5:20 PM EDT | HAIL 1 | Ashland Ma, | |
| May 24, 5:25 PM EDT | HAIL 0.75 | Holliston, MA | MIXED WITH SMALLER HAIL...LASTED 10 MINUTES. |
| May 24, 5:35 PM EDT | TSTM WND DMG | Framingham, MA | TREE AND WIRES DOWN ON HOLLIS STREET. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 9.2 hours before the alert went out and 129 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
- 658 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KBOX 242114 SVRBOX MAC017-021-027-242145- /O.NEW.KBOX.SV.W.0021.090524T2114Z-090524T2145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 514 PM EDT SUN MAY 24 2009 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS... THIS INCLUDES THE CITY OF MILFORD... SOUTH CENTRAL MIDDLESEX COUNTY IN EASTERN MASSACHUSETTS... THIS INCLUDES THE CITIES OF...WALTHAM...NEWTON...FRAMINGHAM... NORTHWESTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS... * UNTIL 545 PM EDT * AT 513 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR HOPKINTON...OR NEAR MILFORD...AND MOVING EAST AT 35 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE... ASHLAND...HOLLISTON... MILLIS...SHERBORN...NATICK...MEDFIELD...DOVER...WELLESLEY... NEEDHAM...WESTWOOD...WESTON...NORWOOD AND DEDHAM SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...IN ADDITION TO DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR SAFETY GO INDOORS NOW AND STAY AWAY FROM WINDOWS. MINOR POOR DRAINAGE FLOODING IS ALSO EXPECTED. DRIVERS SHOULD AVOID FLOODED ROADWAYS. HAIL UP TO 1.75 INCHES IN DIAMETER HAS BEEN REPORTED WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...ACT NOW TO PROTECT LIFE AND PROPERTY. GET INDOORS NOW AND STAY AWAY FROM WINDOWS LAT...LON 4219 7114 4212 7154 4226 7162 4239 7124 TIME...MOT...LOC 2114Z 256DEG 32KT 4221 7152 $$ WTB
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 1:55 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk | 24 min |
| May 24, 2:21 PM EDT | Special Marine Warning | BOX | 165 days | |
| May 24, 2:32 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 43 min |
| May 24, 3:05 PM EDT | Severe Thunderstorm Warning | BOX | Norfolk, Plymouth | 40 min |
| May 24, 3:07 PM EDT | Special Marine Warning | BOX | 13 min | |
| May 24, 3:45 PM EDT | Severe Thunderstorm Warning | BOX | Plymouth | 45 min |
| May 24, 4:01 PM EDT | Special Marine Warning | BOX | 59 min | |
| May 24, 4:07 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 18 min |
| May 24, 4:28 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk | 32 min |
| May 24, 4:29 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 15 min |
| May 24, 4:38 PM EDT | Special Marine Warning | BOX | 67 min | |
| May 24, 4:46 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 44 min |
| May 24, 5:46 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 19 min |
| May 24, 6:13 PM EDT | Special Marine Warning | BOX | 32 min | |
| May 24, 6:27 PM EDT | Special Marine Warning | BOX | 63 min | |
| May 24, 6:51 PM EDT | Special Marine Warning | BOX | 24 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2009Every severe thunderstorm warning in 2009
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.