Alert archive / Pennsylvania / Tornado Watches in 2019

Tornado Watch 105

April 26, 20195 states

The Storm Prediction Center issued this tornado watch at Apr 26, 2019, 1:33 PM EDT for 5 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 26, 2019, 1:33 PM EDT (17:33 UTC)
Expired: Apr 26, 2019, 7:13 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 86 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, 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, Somerset County, MD, Talbot County, MD, Washington 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, Ocean County, NJ, Salem County, NJ, Adams County, PA, Berks County, PA, Bucks County, PA, Centre County, PA, Chester County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, Mifflin County, PA, Montgomery County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Union County, PA, York County, PA, Accomack County, VA, 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, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, King George County, VA, Lancaster County, VA, Loudoun County, VA, Madison County, VA, Northampton County, VA, Northumberland County, VA, Orange County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Spotsylvania County, VA, Stafford County, VA, Westmoreland County, VA

The radar

The Dover AFB radar (KDOX), 158 km from the middle of the area, began a volume at 17:32 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: 80%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 26, 1:33 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Madison, Orange, Spotsylvania	57 min
Apr 26, 1:51 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Prince William, Rappahannock	39 min
Apr 26, 2:20 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	40 min
Apr 26, 2:25 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery, Prince George's	50 min
Apr 26, 2:29 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, King George, Orange, Spotsylvania, Stafford and 1 more	46 min
Apr 26, 2:37 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Howard, City of Baltimore	38 min
Apr 26, 2:39 PM EDT	Tornado Warning	LWX	Montgomery	19 min
Apr 26, 2:51 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Juniata, Perry	54 min
Apr 26, 2:54 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin	29 min
Apr 26, 2:56 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Prince George's	49 min
Apr 26, 2:59 PM EDT	Severe Thunderstorm Warning	AKQ	Lancaster, Northumberland, Richmond, Westmoreland	19 min
Apr 26, 3:00 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	45 min
Apr 26, 3:08 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	67 min
Apr 26, 3:13 PM EDT	Tornado Warning	LWX	Baltimore, Harford	32 min
Apr 26, 3:20 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	70 min
Apr 26, 3:23 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	67 min
Apr 26, 3:26 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Howard, City of Baltimore	39 min
Apr 26, 3:32 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	58 min
Apr 26, 3:37 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel	26 min
Apr 26, 3:45 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Lebanon, Northumberland, Perry, Schuylkill	64 min
Apr 26, 3:48 PM EDT	Severe Thunderstorm Warning	AKQ	Essex, Lancaster, Middlesex, Northumberland, Richmond, Westmoreland	42 min
Apr 26, 4:01 PM EDT	Tornado Warning	PHI	Cecil, Kent, Queen Anne's	29 min
Apr 26, 4:09 PM EDT	Severe Thunderstorm Warning	AKQ	Northampton	51 min
Apr 26, 4:12 PM EDT	Severe Thunderstorm Warning	AKQ	Dorchester, Somerset, Wicomico	63 min
Apr 26, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	56 min
Apr 26, 4:21 PM EDT	Tornado Warning	AKQ	Northampton	24 min
Apr 26, 4:24 PM EDT	Tornado Warning	PHI	Cecil, Kent	36 min
Apr 26, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	47 min
Apr 26, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	52 min
Apr 26, 4:56 PM EDT	Severe Thunderstorm Warning	AKQ	Dorchester, Somerset, Wicomico, Worcester	64 min
Apr 26, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	38 min
Apr 26, 5:15 PM EDT	Severe Thunderstorm Warning	AKQ	Worcester	30 min
Apr 26, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	43 min
Apr 26, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	47 min
Apr 26, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Kent	38 min
Apr 26, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	28 min
Apr 26, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer	61 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, 5.6 hours before the alert went out and 156 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 49 J/kg
Mixed-layer CIN: -221 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 355 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

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, 2:09 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	2 hr
Apr 26, 4:26 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	94 min
Apr 26, 2:01 PM EDT	Severe Thunderstorm Watch	SPC	Amelia, Brunswick, Caroline, Charles City, Chesterfield, Cumberland and 41 more	5 hr

Nearby

Tornado Watches in Pennsylvania, 2019 Tornado Watches in Virginia, 2019 Tornado Watches in Maryland, 2019 Every tornado watch 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.