Alert archive / New Jersey / Mesoscale Discussions in 2012

Mesoscale Discussion 967

May 29, 20125 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2012, 7:01 PM EDT for 5 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
May 29, 2012, 7:01 PM EDT (23:01 UTC)
Expired
May 29, 2012, 8:30 PM EDT
In force
89 min
Issued by
the Storm Prediction Center
All 25 counties

Hampden County, MA, Hampshire County, MA, Worcester County, MA, Hillsborough County, NH, Bergen County, NJ, Burlington County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Putnam County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Bucks County, PA, Philadelphia County, PA

The radar

The Brookhaven radar (KOKX), 80 km from the middle of the area, began a volume at 23:01 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

Brookhaven, NY (KOKX), launched 12:00Z, 11.0 hours before the alert went out and 80 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1578 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1578 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
960 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
-16 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

864 
ACUS11 KWNS 292302
SWOMCD
SPC MCD 292301
MAZ000-NHZ000-CTZ000-NYZ000-NJZ000-PAZ000-300030-

MESOSCALE DISCUSSION 0967
NWS STORM PREDICTION CENTER NORMAN OK
0601 PM CDT TUE MAY 29 2012

AREAS AFFECTED...EXTREME SERN PA...NJ...SERN NY...CT...WRN AND CNTRL
MA AND SRN NH

CONCERNING...SEVERE THUNDERSTORM WATCH 314...315...318...

VALID 292301Z - 300030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
314...315...318...CONTINUES.

SUMMARY...THREAT FOR MAINLY ISOLATED STRONG TO DAMAGING WIND GUSTS
AND SOME HAIL WILL PERSIST UNTIL 02Z FROM SERN PA...NJ...THE NEW
YORK CITY AREA AND NEWD THROUGH SRN NEW ENGLAND.

DISCUSSION...EARLY THIS EVENING AN EXPANSIVE SQUALL LINE EXTENDS
FROM NRN VA THROUGH ERN PA...SERN NY INTO WRN MA AND SRN NH MOVING
EAST AT 30 KT. STORMS SHOULD BEGIN TO AFFECT WRN PORTIONS OF NEW
YORK CITY AREA BY 00Z. OBSERVED WIND GUSTS DURING THE PAST HOUR HAVE
RANGED FROM 30 TO 50 KT. THE STRONGER STORMS WITHIN THE LINE WILL
REMAIN CAPABLE OF PRODUCING ISOLATED STRONG TO DAMAGING WIND GUSTS
AS THEY MOVE THROUGH THE REMAINING INSTABILITY AXIS WHERE MLCAPE
RANGES FROM 1500-2000 J/KG. TOWARD MID EVENING...THE STORMS ARE
EXPECTED TO UNDERGO A GRADUAL WEAKENING TREND AS THE BOUNDARY LAYER
STABILIZES AND AS STORMS BEGIN TO ENCOUNTER THE COOLER MARINE
BOUNDARY LAYER.

..DIAL.. 05/29/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...BOX...OKX...ALY...PHI...

LAT...LON   41287437 42467274 43087185 42757137 41837223 40717387
            39707446 39987549 41287437

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 12:26 PM EDTTornado WatchSPCNorthwest Hills Planning Region8 hr
May 29, 2:13 PM EDTMesoscale DiscussionSPC62 min
May 29, 3:44 PM EDTSevere Thunderstorm WatchSPCCapitol Planning Region5 hr
May 29, 5:54 PM EDTSevere Thunderstorm WatchSPCGreater Bridgeport Planning Region, Naugatuck Valley Planning Region3 hr
May 29, 7:21 PM EDTMesoscale DiscussionSPC54 min
May 29, 12:01 PM EDTMesoscale DiscussionSPCBerkshire59 min
May 29, 1:52 PM EDTMesoscale DiscussionSPCBerkshire53 min
May 29, 3:26 PM EDTMesoscale DiscussionSPCBerkshire64 min
May 29, 2:49 PM EDTMesoscale DiscussionSPCBelknap, Carroll, Coos, Grafton, Merrimack56 min
May 29, 4:40 PM EDTMesoscale DiscussionSPCHunterdon, Morris, Sussex, Warren65 min
May 29, 10:27 AM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Jefferson, Lewis and 11 more5 hr
May 29, 11:43 AM EDTMesoscale DiscussionSPCAlbany, Broome, Cayuga, Chemung, Chenango, Columbia and 26 more62 min
May 29, 1:03 PM EDTSevere Thunderstorm WatchSPCBroome, Chemung, Chenango, Cortland, Delaware, Madison and 5 more8 hr
May 29, 1:25 PM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 13 more65 min
May 29, 3:12 PM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Cortland, Delaware and 12 more63 min
May 29, 9:48 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Clearfield and 8 more87 min

Nearby

Mesoscale Discussions in New Jersey, 2012Mesoscale Discussions in New York, 2012Mesoscale Discussions in Connecticut, 2012Every mesoscale discussion in 2012

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.