Alert archive / Maryland / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 78, NWS Philadelphia/Mount Holly

June 24, 2010New Castle County, Delaware; Chester County, Pennsylvania; Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 24, 2010, 3:29 PM EDT for New Castle County, Delaware; Chester County, Pennsylvania; Cecil County, Kent County, Maryland. It was in force for 61 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 24, 2010, 3:29 PM EDT (19:29 UTC)
Expired: Jun 24, 2010, 4:30 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Kent County, MD, Chester County, PA

The radar

The Dover AFB radar (KDOX), 84 km from the middle of the area, began a volume at 19:29 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 was reported inside it

Time	Report	Where	Remark
Jun 24, 4:00 PM EDT	TSTM WND DMG	Newark, DE	TREES DOWN IN NEWARK.
Jun 24, 4:13 PM EDT	TSTM WND GST 70	New Castle, DE	70 MPH WIND GUST AT NEW CASTLE AIRPORT
Jun 24, 4:15 PM EDT	TSTM WND DMG	Bear, DE	TREES DOWN IN BEAR

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 24, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.5 hours before the alert went out and 25 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: 126 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

713 
WUUS51 KPHI 241929
SVRPHI
DEC003-MDC015-029-PAC029-242030-
/O.NEW.KPHI.SV.W.0078.100624T1929Z-100624T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
329 PM EDT THU JUN 24 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...NEWARK...MIDDLETOWN...
  SOUTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 430 PM EDT

* AT 325 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS OVER SOUTHEAST
  YORK COUNTY IN PENNSYLVANIA...AND MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ROCK SPRINGS...CONOWINGO AND OCTORARO AROUND 335 PM EDT...
  RICHARDSMERE...WEST NOTTINGHAM AND RISING SUN AROUND 340 PM EDT...
  FARMINGTON...WOODLAWN AND CALVERT AROUND 345 PM EDT...
  BAY VIEW AROUND 350 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM.

&&

LAT...LON 3975 7610 3984 7603 3970 7551 3962 7560
      3959 7559 3959 7555 3946 7558 3942 7553
      3936 7553 3931 7559 3929 7568 3930 7575
      3928 7577 3939 7606 3945 7600 3946 7602
      3953 7599 3956 7610 3972 7624
TIME...MOT...LOC 1927Z 292DEG 40KT 3974 7627

$$

IOVINO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 2:56 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	64 min
Jun 24, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	57 min
Jun 24, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	87 min
Jun 24, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Kent	59 min
Jun 24, 6:53 PM EDT	Special Weather Statement	PHI	Sussex	67 min
Jun 24, 7:14 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	50 min
Jun 24, 12:36 PM EDT	Special Weather Statement	PHI	Monroe	54 min
Jun 24, 1:16 PM EDT	Special Weather Statement	PHI	Monroe	59 min
Jun 24, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Berks	66 min
Jun 24, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	59 min
Jun 24, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	62 min
Jun 24, 5:02 PM EDT	Special Weather Statement	PHI	Caroline, Queen Anne's	58 min
Jun 24, 6:05 PM EDT	Special Weather Statement	PHI	Talbot	55 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2010 Severe Thunderstorm Warnings in Delaware, 2010 Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.