Alert archive / Connecticut / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 2, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 21, 2013, 4:39 PM EDT for Northeastern Connecticut Planning Region, Connecticut. It was in force for 51 min. 1 report 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 21, 2013, 4:39 PM EDT (20:39 UTC)
- Expired
- May 21, 2013, 5:30 PM EDT
- In force
- 51 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
The radar
The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 20:39 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 21, 4:46 PM EDT | HAIL 0.75 | Pomfret, CT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 21, 2:03 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 134 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
- 267 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 734 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
452 WUUS51 KBOX 212039 SVRBOX CTC015-212130- /O.NEW.KBOX.SV.W.0002.130521T2039Z-130521T2130Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 439 PM EDT TUE MAY 21 2013 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN WINDHAM COUNTY IN NORTHERN CONNECTICUT... * UNTIL 530 PM EDT * AT 434 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR POMFRET...OR 5 MILES SOUTHWEST OF PUTNAM...AND MOVING SOUTHEAST AT 20 MPH. * LOCATIONS IMPACTED INCLUDE... PUTNAM...KILLINGLY...DANIELSON AND POMFRET. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL. GO INSIDE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. IF DRIVING BE PREPARED FOR LOW VISIBILITY AND DO NOT DRIVE THROUGH FLOODED ROADS. && LAT...LON 4177 7185 4186 7209 4194 7207 4192 7180 TIME...MOT...LOC 2038Z 295DEG 16KT 4188 7200 $$ JWD
2 follow-up statements
359 WWUS51 KBOX 212103 SVSBOX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 503 PM EDT TUE MAY 21 2013 CTC015-212130- /O.CON.KBOX.SV.W.0002.000000T0000Z-130521T2130Z/ WINDHAM CT- 503 PM EDT TUE MAY 21 2013 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR NORTHERN WINDHAM COUNTY... AT 500 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR POMFRET...OR 6 MILES SOUTHWEST OF PUTNAM...MOVING SOUTHEAST AT 10 MPH. AMATEUR RADIO OPERATORS REPORTED DIME SIZED HAIL WITH THIS STORM AT 446 PM. LOCATIONS IMPACTED INCLUDE... PUTNAM...KILLINGLY...DANIELSON AND POMFRET. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND DESTRUCTIVE HAIL. GO INSIDE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. DRIVERS SHOULD EXPECT POOR VISIBILITY AND AVOID FLOODED ROADS. && LAT...LON 4177 7185 4186 7209 4194 7207 4192 7180 TIME...MOT...LOC 2100Z 305DEG 10KT 4184 7198 $$ JWD
020
WWUS51 KBOX 212125
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
525 PM EDT TUE MAY 21 2013
CTC015-212134-
/O.EXP.KBOX.SV.W.0002.000000T0000Z-130521T2130Z/
WINDHAM CT-
525 PM EDT TUE MAY 21 2013
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WINDHAM COUNTY WILL
EXPIRE AT 530 PM EDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.
EARLIER...SPOTTERS REPORTED DIME SIZED HAIL WITH THIS STORM.
HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM...WHICH WILL
CAUSE MINOR FLOODING.
&&
LAT...LON 4177 7185 4186 7209 4194 7207 4192 7180
TIME...MOT...LOC 2124Z 295DEG 16KT 4184 7198
$$
JWDThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 3:05 PM EDT | Special Weather Statement | BOX | 40 min | |
| May 21, 4:17 PM EDT | Special Weather Statement | BOX | 43 min | |
| May 21, 5:21 PM EDT | Areal Flood Advisory | BOX | Northeastern Connecticut Planning Region | 114 min |
| May 21, 5:26 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 49 min |
| May 21, 6:03 PM EDT | Special Weather Statement | BOX | 42 min | |
| May 21, 6:10 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 50 min |
| May 21, 6:16 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 44 min |
| May 21, 7:08 PM EDT | Special Weather Statement | BOX | 37 min | |
| May 21, 7:20 PM EDT | Special Weather Statement | BOX | 55 min |
Nearby
Severe Thunderstorm Warnings in Connecticut, 2013Every severe thunderstorm warning in 2013
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.