Alert archive / Maryland / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 305
The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2016, 4:09 PM EDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 28, 2016, 4:09 PM EDT (20:09 UTC)
- Expired
- Jun 28, 2016, 11:21 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
All 50 counties
Kent County, DE, New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Salem County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Fauquier County, VA, King George County, VA, Loudoun County, VA, Prince William County, VA, Spotsylvania County, VA, Stafford County, VA
The radar
The Sterling radar (KLWX), 120 km from the middle of the area, began a volume at 20:09 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 49 min |
| Jun 28, 4:44 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 61 min |
| Jun 28, 4:46 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William | 44 min |
| Jun 28, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Rappahannock, Warren | 45 min |
| Jun 28, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | York | 47 min |
| Jun 28, 5:18 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Howard, City of Baltimore | 42 min |
| Jun 28, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William, City of Manassas, City of Manassas Park | 50 min |
| Jun 28, 5:49 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 33 min |
| Jun 28, 5:55 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 50 min |
| Jun 28, 6:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 48 min |
| Jun 28, 6:52 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 38 min |
| Jun 28, 7:04 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 24 min |
| Jun 28, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 52 min |
| Jun 28, 7:30 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 45 min |
| Jun 28, 8:16 PM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 4 hr |
| Jun 28, 8:53 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Prince William, Stafford | 37 min |
| Jun 28, 8:58 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fairfax, Fauquier, Prince William, City of Fairfax, City of Manassas and 1 more | 36 min |
| Jun 28, 9:07 PM EDT | Flash Flood Warning | LWX | Fauquier, Prince William, Stafford | 3 hr |
| Jun 28, 9:08 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Prince William, Stafford | 43 min |
| Jun 28, 9:29 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, King George, Orange, Spotsylvania, Stafford, City of Fredericksburg | 46 min |
| Jun 28, 10:50 PM EDT | Flash Flood Warning | LWX | Culpeper, Spotsylvania, Stafford, City of Fredericksburg | 3 hr |
| Jun 28, 11:05 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania | 25 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 116 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
- 341 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 7:16 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle | 59 min |
| Jun 28, 3:49 PM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Cecil, Frederick, Harford, Howard and 3 more | 56 min |
| Jun 28, 1:09 PM EDT | Mesoscale Discussion | SPC | Bradford, Carbon, Clinton, Columbia, Lackawanna, Luzerne and 11 more | 66 min |
Nearby
Severe Thunderstorm Watches in Maryland, 2016Severe Thunderstorm Watches in Virginia, 2016Severe Thunderstorm Watches in Pennsylvania, 2016Every severe thunderstorm watch in 2016
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.