Alert archive / Maryland / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 131, NWS Philadelphia/Mount Holly

July 14, 2004Cecil County, Maryland; Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2004, 4:24 PM EDT for Cecil County, Maryland; Chester County, Pennsylvania. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 14, 2004, 4:24 PM EDT (20:24 UTC)
Expired
Jul 14, 2004, 5:30 PM EDT
In force
66 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Cecil County, MD, Chester County, PA

The radar

The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 20:26 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 14, 12:50 PM EDTTornado WatchSPC6 hr
Jul 14, 1:15 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.4 hours before the alert went out and 52 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, Phillips Aaf/Abe, MD at 12:00Z on 2004-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Phillips Aaf/Abe, MD at 12:00Z on 2004-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.193958Sfc1 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
3 J/kg
Mixed-layer CIN
-233 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
125 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.

000 
WUUS51 KPHI 142024
SVRPHI
MDC015-PAC029-142130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
423 PM EDT WED JUL 14 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 530 PM EDT

* AT 422 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  RISING SUN...AND MOVING EAST NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RISING SUN BY 430 PM EDT...
  OXFORD BY 445 PM EDT...
  WEST GROVE BY 500 PM EDT...
  KENNETT SQUARE BY 520 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 3972 7611 3987 7599 3992 7600 4011 7594
      4025 7567 4020 7557 4012 7551 4006 7538
      3987 7562 3985 7561 3978 7575 3972 7580
      3963 7580 3960 7612 3971 7622

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 3:03 PM EDTSevere Thunderstorm WarningPHICecil57 min
Jul 14, 3:05 PM EDTFlash Flood WarningPHICecil, Kent76 days
Jul 14, 4:32 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's58 min
Jul 14, 5:16 PM EDTSevere Thunderstorm WarningPHICaroline59 min
Jul 14, 2:22 PM EDTSevere Thunderstorm WarningPHIBucks53 min
Jul 14, 3:12 PM EDTSevere Thunderstorm WarningPHIBerks63 min
Jul 14, 4:10 PM EDTSevere Thunderstorm WarningPHIBerks65 min
Jul 14, 4:44 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery61 min
Jul 14, 5:01 PM EDTTornado WarningPHIMontgomery29 min
Jul 14, 5:17 PM EDTSpecial Marine WarningPHI103 min
Jul 14, 5:41 PM EDTSevere Thunderstorm WarningPHIPhiladelphia64 min
Jul 14, 5:44 PM EDTSevere Thunderstorm WarningPHIBucks61 min
Jul 14, 5:51 PM EDTFlash Flood WarningPHIBucks2 hr
Jul 14, 6:01 PM EDTSpecial Marine WarningPHI74 min
Jul 14, 6:39 PM EDTSpecial Marine WarningPHI66 min
Jul 14, 6:39 PM EDTSpecial Marine WarningPHI66 min
Jul 14, 6:46 PM EDTFlash Flood WarningPHIBerks3 hr
Jul 14, 7:00 PM EDTSpecial Marine WarningPHI60 min
Jul 14, 7:38 PM EDTSpecial Marine WarningPHI82 min
Jul 14, 7:38 PM EDTSpecial Marine WarningPHI82 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2004Severe Thunderstorm Warnings in Pennsylvania, 2004Every severe thunderstorm warning in 2004

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.