Alert archive / Maryland / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly

May 14, 2010Caroline County, Kent County, Queen Anne's County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 8:04 PM EDT for Caroline County, Kent County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 56 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
May 14, 2010, 8:04 PM EDT (00:04 UTC)
Expired
May 14, 2010, 9:00 PM EDT
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Kent County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 00:04 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
May 14, 3:43 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.1 hours before the alert went out and 110 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 2010-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2598 joules per kilogram.LCLLFCEL10008507005003002001001 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, Washington/Dulle, VA at 00:00Z on 2010-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
2598 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
1130 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
1.0
Supercell composite
7.2

Open this sounding in Storm Lab

The text

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

013 
WUUS51 KPHI 150004
SVRPHI
DEC001-MDC011-029-035-150100-
/O.NEW.KPHI.SV.W.0028.100515T0004Z-100515T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
804 PM EDT FRI MAY 14 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  SOUTHWESTERN KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF CENTERVILLE...

* UNTIL 900 PM EDT

* AT 759 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 LOCATED 7 MILES
  WEST OF ROCK HALL...OR 16 MILES SOUTHEAST OF BALTIMORE...AND MOVING
  EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ROCK HALL AROUND 810 PM EDT...
  LANGFORD AROUND 815 PM EDT...
  OLD TOWN AROUND 820 PM EDT...
  STARKEY CORNER AROUND 825 PM EDT...
  CHURCH HILL AND HOPE AROUND 830 PM EDT...
  SUDLERSVILLE AROUND 835 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3905 7631 3904 7625 3906 7623 3914 7626
      3915 7628 3916 7628 3925 7622 3919 7543
      3893 7550 3894 7582 3902 7624 3904 7627
      3903 7629 3904 7632
TIME...MOT...LOC 0002Z 278DEG 37KT 3916 7632

$$

HAYES
2 follow-up statements
744 
WWUS51 KPHI 150022 RRA
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
822 PM EDT FRI MAY 14 2010

DEC001-MDC011-029-035-150100-
/O.CON.KPHI.SV.W.0028.000000T0000Z-100515T0100Z/
KENT DE-CAROLINE MD-KENT MD-QUEEN ANNE'S MD-
822 PM EDT FRI MAY 14 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHERN QUEEN ANNE'S...SOUTHWESTERN KENT...NORTHERN CAROLINE AND
CENTRAL KENT COUNTIES...

AT 820 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR OLD TOWN...OR 6 MILES NORTH OF CENTERVILLE...MOVING EAST
AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOPE BY 830 PM EDT...
  BARCLAY AND SUDLERSVILLE BY 835 PM EDT...
  MARYDEL...HENDERSON...TEMPLEVILLE AND GOLDSBORO BY 845 PM EDT...
  SANDTOWN BY 850 PM EDT...
  WOODSIDE AND HAZLETTVILLE BY 855 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3905 7631 3904 7625 3906 7623 3914 7626
      3915 7628 3916 7628 3925 7622 3919 7543
      3893 7550 3894 7582 3902 7624 3904 7627
      3903 7629 3904 7632
TIME...MOT...LOC 0022Z 278DEG 37KT 3913 7606

$$

HAYES
660 
WWUS51 KPHI 150102
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
902 PM EDT FRI MAY 14 2010

DEC001-MDC011-029-035-150112-
/O.EXP.KPHI.SV.W.0028.000000T0000Z-100515T0100Z/
KENT DE-CAROLINE MD-KENT MD-QUEEN ANNE'S MD-
902 PM EDT FRI MAY 14 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN QUEEN ANNE'S...
SOUTHWESTERN KENT...NORTHERN CAROLINE AND CENTRAL KENT COUNTIES HAS
EXPIRED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

LAT...LON 3905 7631 3904 7625 3906 7623 3914 7626
      3915 7628 3916 7628 3925 7622 3919 7543
      3893 7550 3894 7582 3902 7624 3904 7627
      3903 7629 3904 7632
TIME...MOT...LOC 0022Z 278DEG 37KT 3913 7606

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 8:49 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot56 min
May 14, 9:45 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot60 min
May 14, 9:05 PM EDTSpecial Weather StatementPHINew Castle55 min
May 14, 9:06 PM EDTSpecial Weather StatementPHINew Castle54 min
May 14, 9:57 PM EDTSevere Thunderstorm WarningPHINew Castle48 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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.