Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 22, NWS Philadelphia/Mount Holly

April 28, 2008Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 28, 2008, 3:58 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 62 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
Apr 28, 2008, 3:58 PM EDT (19:58 UTC)
Expired
Apr 28, 2008, 5:00 PM EDT
In force
62 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 55 km from the middle of the area, began a volume at 19:59 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, 8.0 hours before the alert went out and 86 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 2008-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2008-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 square meters per square second.19395878Sfc1 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
4 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
412 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
293 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 281958
SVRPHI
DEC001-005-MDC011-041-282100-
/O.NEW.KPHI.SV.W.0022.080428T1958Z-080428T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
358 PM EDT MON APR 28 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN KENT COUNTY IN CENTRAL DELAWARE...
  SOUTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  SOUTHERN TALBOT COUNTY IN EASTERN MARYLAND...
  WEST CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 500 PM EDT

* AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR OXFORD...OR ABOUT 51 MILES
  SOUTHWEST OF DOVER...AND MOVING EAST AT 39 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EASTON AND TRAPPE BY 410 PM EDT...
  PRESTON BY 425 PM EDT...
  7 MILES SOUTH OF DENTON AND 7 MILES NORTH OF FEDERALSBURG BY 435 PM
  EDT...
  6 MILES NORTH OF BRIDGEVILLE BY 450 PM EDT...

IF YOU SEE THREATENING WEATHER, PLEASE SEEK SHELTER IMMEDIATELY.

LAT...LON 3876 7628 3877 7624 3894 7566 3865 7556
      3864 7572 3869 7582 3869 7589 3867 7595
      3862 7598 3861 7611 3863 7612 3864 7616
      3868 7619 3866 7620 3867 7622 3873 7625
      3873 7627
TIME...MOT...LOC 1958Z 253DEG 34KT 3869 7622

$$
 
TFG
1 follow-up statement
000 
WWUS51 KPHI 282032
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
432 PM EDT MON APR 28 2008

MDC041-282042-
/O.CAN.KPHI.SV.W.0022.000000T0000Z-080428T2100Z/
TALBOT MD-
432 PM EDT MON APR 28 2008

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TALBOT COUNTY IS
CANCELLED...

LAT...LON 3869 7582 3869 7585 3884 7591 3891 7565
      3890 7564 3884 7563 3880 7561 3878 7561
      3872 7558 3868 7580
TIME...MOT...LOC 2032Z 253DEG 34KT 3877 7582

$$

DEC001-005-MDC011-282100-
/O.CON.KPHI.SV.W.0022.000000T0000Z-080428T2100Z/
KENT DE-CAROLINE MD-SUSSEX DE-
432 PM EDT MON APR 28 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR WEST CENTRAL SUSSEX...SOUTHERN CAROLINE AND SOUTHWESTERN KENT
COUNTIES...

AT 429 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES NORTHWEST OF 
FEDERALSBURG...MOVING EAST AT 39 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BRIDGEVILLE BY 450 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 3869 7582 3869 7585 3884 7591 3891 7565
      3890 7564 3884 7563 3880 7561 3878 7561
      3872 7558 3868 7580
TIME...MOT...LOC 2032Z 253DEG 34KT 3877 7582

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 4:19 PM EDTSevere Thunderstorm WarningPHIKent56 min
Apr 28, 4:37 PM EDTTornado WarningPHIKent23 min
Apr 28, 5:22 PM EDTAreal Flood AdvisoryPHINew Castle113 min
Apr 28, 3:25 PM EDTSevere Thunderstorm WarningPHICecil, Kent, Queen Anne's65 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2008Severe Thunderstorm Warnings in Maryland, 2008Every severe thunderstorm warning in 2008

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.