Alert archive / Maryland / Tornado Watches in 2020
Tornado Watch 515
The Storm Prediction Center issued this tornado watch at Nov 30, 2020, 1:07 PM EST for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 30, 2020, 1:07 PM EST (18:07 UTC)
- Expired
- Nov 30, 2020, 7:00 PM EST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 44 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Harford County, MD, Kent County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot 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, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA, Accomack County, VA, King George County, VA, Lancaster County, VA, Northumberland County, VA, Richmond County, VA, Westmoreland County, VA
The radar
The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 18:09 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 1:28 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 28 min |
| Nov 30, 1:38 PM EST | Severe Thunderstorm Warning | AKQ | Essex, King and Queen, Richmond, Westmoreland | 22 min |
| Nov 30, 2:22 PM EST | Severe Thunderstorm Warning | LWX | Cecil, Harford | 38 min |
| Nov 30, 2:36 PM EST | Tornado Warning | LWX | Cecil, Harford | 9 min |
| Nov 30, 2:41 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 49 min |
| Nov 30, 2:50 PM EST | Tornado Warning | LWX | Cecil | 25 min |
| Nov 30, 3:01 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 44 min |
| Nov 30, 3:04 PM EST | Severe Thunderstorm Warning | PHI | Kent, New Castle | 56 min |
| Nov 30, 3:11 PM EST | Tornado Warning | PHI | Caroline, Queen Anne's | 17 min |
| Nov 30, 3:21 PM EST | Tornado Warning | PHI | Kent | 24 min |
| Nov 30, 3:43 PM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 47 min |
| Nov 30, 3:47 PM EST | Tornado Warning | PHI | Kent | 28 min |
| Nov 30, 3:53 PM EST | Tornado Warning | PHI | Hunterdon | 13 min |
| Nov 30, 4:49 PM EST | Severe Thunderstorm Warning | PHI | Camden, Cumberland, Gloucester, Salem | 41 min |
| Nov 30, 5:29 PM EST | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Somerset | 46 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.1 hours before the alert went out and 163 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
- 2 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 524 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 326 m²/s²
- 0-3 km storm-relative helicity
- 630 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
248 WWUS20 KWNS 301802 SEL5 SPC WW 301802 DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-010000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 515 NWS Storm Prediction Center Norman OK 105 PM EST Mon Nov 30 2020 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Delaware Eastern Maryland Central and Southern New Jersey Southeast Pennsylvania Eastern Virginia Coastal Waters * Effective this Monday afternoon and evening from 105 PM until 700 PM EST. * Primary threats include... A couple tornadoes possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Thunderstorms are intensify along an axis from eastern Virginia into southeast Pennsylvania. This activity may become severe, posing a risk of damaging wind gusts and a few tornadoes through the afternoon. The tornado watch area is approximately along and 50 statute miles east and west of a line from 25 miles northeast of Trenton NJ to 45 miles south of Patuxent River MD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 400. Mean storm motion vector 23040. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 12:26 PM EST | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 3 hr |
| Nov 30, 3:02 PM EST | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 88 min |
| Nov 30, 4:37 PM EST | Mesoscale Discussion | SPC | Kent, Sussex | 53 min |
Nearby
Tornado Watches in Maryland, 2020Tornado Watches in New Jersey, 2020Tornado Watches in Virginia, 2020Every tornado watch in 2020
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.