Alert archive / Virginia / Mesoscale Discussions in 2019
Mesoscale Discussion 455
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2019, 4:26 PM EDT for 5 states. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2019, 4:26 PM EDT (20:26 UTC)
- Expired
- Apr 26, 2019, 6:00 PM EDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 39 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Queen Anne's County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Schuylkill County, PA, Accomack County, VA, City of Chesapeake, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Virginia Beach, VA, Mathews County, VA, Northampton County, VA, York County, VA
The radar
The Dover AFB radar (KDOX), 14 km from the middle of the area, began a volume at 20:26 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 12:00Z, 8.4 hours before the alert went out and 100 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
- 44 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 1440 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 11:37 AM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 113 min |
| Apr 26, 1:33 PM EDT | Tornado Watch | SPC | Kent, New Castle, Sussex | 6 hr |
| Apr 26, 2:09 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle | 2 hr |
| Apr 26, 2:01 PM EDT | Severe Thunderstorm Watch | SPC | Amelia, Brunswick, Caroline, Charles City, Chesterfield, Cumberland and 41 more | 5 hr |
Nearby
Mesoscale Discussions in Virginia, 2019Mesoscale Discussions in Pennsylvania, 2019Mesoscale Discussions in New Jersey, 2019Every mesoscale discussion in 2019
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.