Alert archive / New Jersey / Mesoscale Discussions in 2021
Mesoscale Discussion 303
The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2021, 7:05 PM EDT for 4 states. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Mar 28, 2021, 7:05 PM EDT (23:05 UTC)
- Expired
- Mar 28, 2021, 9:00 PM EDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 69
All 21 counties
New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Union County, NJ, Richmond County, NY, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 23:08 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, 11.1 hours before the alert went out and 180 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
- 666 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 285 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
783
ACUS11 KWNS 282305
SWOMCD
SPC MCD 282305
NJZ000-NYZ000-PAZ000-DEZ000-290100-
Mesoscale Discussion 0303
NWS Storm Prediction Center Norman OK
0605 PM CDT Sun Mar 28 2021
Areas affected...New Jersey...Delaware....eastern Maryland
Concerning...Severe Thunderstorm Watch 69...
Valid 282305Z - 290100Z
The severe weather threat for Severe Thunderstorm Watch 69
continues.
SUMMARY...Strong to severe wind gusts remain possible over the next
1-2 hours, mainly over New Jersey.
DISCUSSION...Radar shows relatively high reflectively now entering
western New Jersey, with a few severe gusts measured recently near
Wilmington Delaware. This strongly forced, low-topped line of
convection will likely maintain strength as it moves across central
New Jersey, until reaching the Atlantic Coast where a cooler
boundary layer exists. Observed VWP wind magnitudes of 50-60 kt near
1 km AGL suggest similar gusts will be possible.
..Jewell.. 03/28/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OKX...PHI...
LAT...LON 40917458 40837430 40757416 40597405 40347400 39817404
39457422 39217451 39067493 39137536 39497565 39767574
40027563 40277534 40577514 40757503 40877477 40917458SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 1:24 PM EDT | Mesoscale Discussion | SPC | Kent, Sussex | 2 hr |
| Mar 28, 5:05 PM EDT | Severe Thunderstorm Watch | SPC | Kent, New Castle, Sussex | 4 hr |
Nearby
Mesoscale Discussions in New Jersey, 2021Mesoscale Discussions in Pennsylvania, 2021Mesoscale Discussions in Delaware, 2021Every mesoscale discussion in 2021
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.