Alert archive / New Jersey / Mesoscale Discussions in 2011
Mesoscale Discussion 628
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 3:55 PM EDT for 5 states. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2011, 3:55 PM EDT (19:55 UTC)
- Expired
- Apr 27, 2011, 5:00 PM EDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 44 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Harford County, MD, Kent County, MD, Queen Anne's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Camden County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Columbia County, NY, Dutchess County, NY, Greene County, NY, Orange County, NY, Putnam County, NY, Rockland County, NY, Sullivan County, NY, Ulster County, NY, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA
The radar
The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 19:55 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.9 hours before the alert went out and 150 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
- 139 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 640 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
469
ACUS11 KWNS 271956
SWOMCD
SPC MCD 271955
CTZ000-MAZ000-NYZ000-NJZ000-PAZ000-DEZ000-MDZ000-VAZ000-272100-
MESOSCALE DISCUSSION 0628
NWS STORM PREDICTION CENTER NORMAN OK
0255 PM CDT WED APR 27 2011
AREAS AFFECTED...PORTIONS OF THE DELMARVA...NJ...ERN PA...SERN NY
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 271955Z - 272100Z
ISOLATED TO SCATTERED THUNDERSTORMS DEVELOPING ACROSS PORTIONS OF
DELMARVA...NJ...ERN PA AND SERN NY WILL POSE A MARGINAL SVR WEATHER
THREAT. WW DOES NOT APPEAR LIKELY ATTM.
PARTIAL SUNSHINE THIS AFTERNOON IS AIDING IN WARMING/DESTABILIZING
BOUNDARY LAYER FROM DELMARVA N-NEWD INTO SERN NY. WITH TEMPERATURES
IN THE UPPER 70S/LOW 80S AND DEWPOINTS IN THE 60S...MLCAPE VALUES
HAVE INCREASED TO AROUND 500-1000 J/KG. IN ADDITION...AREA VWP/S AND
RUC FORECAST SOUNDINGS SHOW VEERING WIND PROFILES...WHICH COULD AID
IN BRIEF STORM ORGANIZATION AS ACTIVITY TRACKS NEWD ACROSS THE AREA.
THOUGH ISOLATED DAMAGING WIND GUSTS OR MARGINALLY SVR HAIL WILL BE
POSSIBLE...THE ENVIRONMENT DOES NOT APPEAR TO SUPPORT A WW ATTM.
..GARNER.. 04/27/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX...
LAT...LON 39277646 40477608 42627404 42467337 41737348 40757425
37627585 39277646SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 1:23 PM EDT | Tornado Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more | 5 hr |
| Apr 27, 1:24 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 96 min |
| Apr 27, 3:10 PM EDT | Tornado Watch | SPC | Garrett | 7 hr |
| Apr 27, 4:39 PM EDT | Mesoscale Discussion | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more | 66 min |
| Apr 27, 6:00 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 9 more | 60 min |
| Apr 27, 6:15 PM EDT | Tornado Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more | 6 hr |
| Apr 27, 6:50 PM EDT | Mesoscale Discussion | SPC | Carroll, Harford, Washington | 55 min |
| Apr 27, 7:55 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Harford and 8 more | 65 min |
Nearby
Mesoscale Discussions in New Jersey, 2011Mesoscale Discussions in Pennsylvania, 2011Mesoscale Discussions in Maryland, 2011Every mesoscale discussion in 2011
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.