Alert archive / New Jersey / Mesoscale Discussions in 2021
Mesoscale Discussion 1208
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2021, 10:01 PM EDT for 5 states. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2021, 10:01 PM EDT (02:01 UTC)
- Expired
- Jul 8, 2021, 11:00 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 350
Counties Sussex County, DE, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Burlington County, NJ, Cape May County, NJ, Cumberland County, NJ, Monmouth County, NJ, Ocean County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Queens County, NY, Richmond County, NY, Accomack County, VA, Northampton County, VA
The radar
The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 02:05 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
Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.0 hours before the alert went out and 141 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
- 440 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 675 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 336 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.3
The text
As transmitted.
394
ACUS11 KWNS 090201
SWOMCD
SPC MCD 090201
NYZ000-CTZ000-NJZ000-MDZ000-DEZ000-VAZ000-090300-
Mesoscale Discussion 1208
NWS Storm Prediction Center Norman OK
0901 PM CDT Thu Jul 08 2021
Areas affected...Chesapeake Bay Vicinity
Concerning...Tornado Watch 350...
Valid 090201Z - 090300Z
The severe weather threat for Tornado Watch 350 continues.
SUMMARY...A marginal threat for a brief tornado may continue along
the immediate Atlantic coast beyond the expiration of Tornado Watch
350. No additional WW is expected this evening.
DISCUSSION...The strongest convection in WW 350 has continued to
move offshore in eastern North Carolina and Virginia. Farther
inland, there has been little notable low-level rotation on regional
radar imagery. As tropical storm Elsa continues northeast this
evening, an isolated stronger convective cell could develop along
the gulf stream and move inland. While low-level winds could still
support a brief tornado, the unfavorable low-level thermodynamic
environment -- especially inland of the immediate coast -- suggests
that this threat will be marginal. No additional watches are
anticipated this evening.
..Wendt.. 07/09/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OKX...PHI...AKQ...
LAT...LON 37087614 38617580 40197467 40877389 41247319 40957274
39887375 37807523 37107561 37087614SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 2:15 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 2 hr |
| Jul 9, 4:35 PM EDT | Mesoscale Discussion | SPC | New Castle | 115 min |
| Jul 9, 3:28 AM EDT | Mesoscale Discussion | SPC | Atlantic, Monmouth, Ocean | 2 hr |
Nearby
Mesoscale Discussions in New Jersey, 2021Mesoscale Discussions in New York, 2021Mesoscale Discussions in Maryland, 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.