Alert archive / Maryland / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 367

June 25, 20135 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 25, 2013, 8:46 PM EDT for 5 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jun 25, 2013, 8:46 PM EDT (00:46 UTC)
Expired
Jun 26, 2013, 12:19 AM EDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 41 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, 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, Talbot County, MD, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Philadelphia County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Fauquier County, VA, King George County, VA, Prince William County, VA, Stafford County, VA

The radar

The Dover AFB radar (KDOX), 115 km from the middle of the area, began a volume at 00:46 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
60%
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
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 25, 9:14 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh61 min
Jun 25, 9:55 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 1 more65 min
Jun 25, 10:06 PM EDTSevere Thunderstorm WarningLWXFrederick, Howard, Montgomery54 min
Jun 25, 10:07 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery53 min
Jun 25, 10:28 PM EDTSevere Thunderstorm WarningPHINew Castle62 min
Jun 25, 10:33 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Charles, Montgomery, Prince George's57 min
Jun 25, 11:01 PM EDTSevere Thunderstorm WarningPHIKent59 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 00:00Z, 0.8 hours before the alert went out and 126 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2013-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 813 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2013-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
813 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1785 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 25, 8:22 PM EDTMesoscale DiscussionSPCNew Castle83 min
Jun 26, 1:19 PM EDTMesoscale DiscussionSPCNew Castle2 hr
Jun 26, 2:55 PM EDTSevere Thunderstorm WatchSPCKent, New Castle, Sussex7 hr
Jun 26, 4:38 PM EDTMesoscale DiscussionSPCKent, New Castle, Sussex97 min
Jun 25, 11:15 PM EDTMesoscale DiscussionSPCDorchester, Saint Mary's, Somerset, Wicomico, Worcester90 min
Jun 26, 4:11 PM EDTMesoscale DiscussionSPCBergen, Essex, Hudson, Hunterdon, Middlesex, Monmouth and 6 more2 hr
Jun 25, 8:44 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Crawford, Erie, Fayette and 5 more61 min
Jun 26, 3:52 PM EDTMesoscale DiscussionSPCBradford, Potter, Tioga113 min
Jun 26, 3:23 PM EDTSevere Thunderstorm WatchSPCCabell, Mingo, Wayne9 hr
Jun 26, 3:50 PM EDTMesoscale DiscussionSPCCabell, Wayne115 min
Jun 26, 7:04 PM EDTMesoscale DiscussionSPCWayne86 min

Nearby

Severe Thunderstorm Watches in Maryland, 2013Severe Thunderstorm Watches in Virginia, 2013Severe Thunderstorm Watches in Pennsylvania, 2013Every severe thunderstorm watch in 2013

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.