Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly

January 25, 20104 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jan 25, 2010, 9:42 AM EST for 4 states. It was in force for 63 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
Jan 25, 2010, 9:42 AM EST (14:42 UTC)
Expired
Jan 25, 2010, 10:45 AM EST
In force
63 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 93 km from the middle of the area, began a volume at 14:42 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 nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 2.7 hours before the alert went out and 43 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 2010-01-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 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 2010-01-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 599 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
599 m²/s²
0-3 km storm-relative helicity
697 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.

200 
WUUS51 KPHI 251442
SVRPHI
DEC003-MDC015-NJC005-007-015-033-PAC017-029-045-091-101-251545-
/O.NEW.KPHI.SV.W.0001.100125T1442Z-100125T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
942 AM EST MON JAN 25 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...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...MIDDLETOWN...
  SOUTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  EXTREME NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  WESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1045 AM EST

* AT 938 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A LINE OF HEAVY SHOWERS CAPABLE OF PRODUCING DAMAGING WINDS IN     
  EXCESS OF 60 MPH.  THIS AREA WAS LOCATED NEAR ELKTON...AND         
  MOVING NORTHEAST AT 50 MPH. YOU MAY NOT SEE LIGHTNING OR HEAR THUNDER
  BUT TAKE COVER ONCE THE HEAVY RAINS BEGIN. 

* THE STRONG WINDS WILL BE NEAR...
  BARKSDALE...APPLETON...CHERRY HILL AND ANDORA AROUND 945 AM EST...
  GLEN WESTOVER...NEWARK AND KEMBLESVILLE AROUND 950 AM EST...
  NORTH STAR...LADENBERG AND PIKE CREEK AROUND 955 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO DAMAGING WINDS...HEAVY RAIN WILL OCCUR WITH THESE 
STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

&&

LAT...LON 4040 7545 4013 7491 3945 7554 3946 7555
      3950 7557 3952 7554 3957 7553 3958 7556
      3946 7558 3945 7555 3935 7564 3948 7601
      3953 7599 3955 7603 3954 7607 3958 7611
TIME...MOT...LOC 1440Z 213DEG 43KT 3962 7586

$$

EBERWINE

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 25, 9:56 AM ESTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Jan 25, 10:09 AM ESTAreal Flood WarningPHIChester, Delaware, Montgomery, Philadelphia10 hr
Jan 25, 11:37 AM ESTAreal Flood WarningPHIBucks6 hr
Jan 25, 12:00 PM ESTRiver Flood WarningPHIBucks11 hr
Jan 25, 12:08 PM ESTAreal Flood AdvisoryPHIBucks, Chester, Montgomery29 days
Jan 25, 12:55 PM ESTRiver Flood WarningPHIDelaware3 hr
Jan 25, 1:50 PM ESTRiver Flood WarningPHIChester4 hr
Jan 25, 10:43 AM ESTRiver Flood WarningPHINew Castle6 hr
Jan 25, 11:10 AM ESTSevere Thunderstorm WarningPHISussex35 min
Jan 25, 11:19 AM ESTAreal Flood AdvisoryPHIKent, Sussex29 days
Jan 25, 10:15 AM ESTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Morris, Somerset6 hr
Jan 25, 11:16 AM ESTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland50 min
Jan 25, 11:24 AM ESTSpecial Marine WarningPHI96 min
Jan 25, 11:46 AM ESTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Monmouth, Ocean59 min
Jan 25, 12:04 PM ESTSpecial Marine WarningPHI86 min
Jan 25, 12:15 PM ESTSpecial Marine WarningPHI60 min
Jan 25, 12:22 PM ESTSpecial Marine WarningPHI53 min
Jan 25, 12:35 PM ESTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean4 hr
Jan 25, 2:00 PM ESTAreal Flood WarningPHIBurlington, Camden, Gloucester4 hr
Jan 25, 3:28 PM ESTSmall Craft AdvisoryPHI35 hr
Jan 25, 3:31 PM ESTAreal Flood WarningPHIHunterdon, Morris, Somerset12 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Severe Thunderstorm Warnings in New Jersey, 2010Severe Thunderstorm Warnings in Delaware, 2010Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.