Alert archive / Delaware / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly

June 22, 2010Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2010, 8:29 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Maryland. It was in force for 46 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
Jun 22, 2010, 8:29 PM EDT (00:29 UTC)
Expired
Jun 22, 2010, 9:15 PM EDT
In force
46 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 22 km from the middle of the area, began a volume at 00:30 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.5 hours before the alert went out and 119 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, Wallops Is Stn, VA at 00:00Z on 2010-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 796 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, Wallops Is Stn, VA at 00:00Z on 2010-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
796 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1216 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.2
Supercell composite
5.1

Open this sounding in Storm Lab

The text

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

631 
WUUS51 KPHI 230029
SVRPHI
DEC001-005-MDC011-035-230115-
/O.NEW.KPHI.SV.W.0068.100623T0029Z-100623T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
829 PM EDT TUE JUN 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
  NORTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  NORTH CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 915 PM EDT

* AT 824 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 NEAR
  HARTLY...OR 14 MILES WEST OF DOVER...AND MOVING SOUTHEAST AT 30
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SANDTOWN AND HAZLETTVILLE AROUND 835 PM EDT...
  WOODSIDE AND 7 MILES SOUTHWEST OF CAMDEN AROUND 845 PM EDT...
  VIOLA AND 8 MILES SOUTHWEST OF RISING SUN AROUND 850 PM EDT...
  HARRINGTON AROUND 900 PM EDT...
  9 MILES SOUTHWEST OF BOWERS AROUND 905 PM EDT...
  MILFORD AND 7 MILES NORTH OF ELLENDALE AROUND 915 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.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
SOUTHERN NEW JERSEY.

&&

LAT...LON 3874 7540 3899 7570 3907 7577 3912 7583
      3922 7576 3911 7541 3895 7532
TIME...MOT...LOC 0029Z 306DEG 24KT 3909 7573

$$

DRAG
1 follow-up statement
833 
WWUS51 KPHI 230103
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
903 PM EDT TUE JUN 22 2010

MDC011-035-230113-
/O.CAN.KPHI.SV.W.0068.000000T0000Z-100623T0115Z/
CAROLINE MD-QUEEN ANNE'S MD-
903 PM EDT TUE JUN 22 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNE'S AND
NORTHEASTERN CAROLINE COUNTIES IS CANCELLED...

LAT...LON 3898 7566 3901 7568 3907 7567 3909 7558
      3909 7549 3895 7532 3874 7540
TIME...MOT...LOC 0103Z 303DEG 16KT 3902 7559

$$

DEC001-005-230115-
/O.CON.KPHI.SV.W.0068.000000T0000Z-100623T0115Z/
KENT DE-SUSSEX DE-
903 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR NORTH CENTRAL SUSSEX AND SOUTHERN KENT COUNTIES...

AT 858 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 VIOLA...OR 10 MILES SOUTHWEST OF DOVER...MOVING
SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RIVERVIEW BY 910 PM EDT...
  FREDERICA...HOUSTON...HARRINGTON AND 6 MILES SOUTHWEST OF MAGNOLIA
  BY 915 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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3898 7566 3901 7568 3907 7567 3909 7558
      3909 7549 3895 7532 3874 7540
TIME...MOT...LOC 0103Z 303DEG 16KT 3902 7559

$$
DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 8:00 PM EDTSevere Thunderstorm WarningPHIKent30 min
Jun 22, 8:14 PM EDTSpecial Weather StatementPHIKent, New Castle61 min
Jun 22, 9:33 PM EDTSevere Thunderstorm WarningPHIKent, Sussex27 min
Jun 22, 9:46 PM EDTSevere Thunderstorm WarningPHIKent, Sussex59 min
Jun 22, 10:36 PM EDTSpecial Weather StatementPHISussex54 min
Jun 22, 10:49 PM EDTSevere Thunderstorm WarningPHISussex41 min
Jun 22, 11:51 PM EDTSpecial Weather StatementPHISussex54 min
Jun 23, 12:58 AM EDTSpecial Weather StatementPHISussex92 min
Jun 22, 9:12 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot18 min
Jun 22, 9:39 PM EDTSpecial Weather StatementPHICaroline66 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2010Severe Thunderstorm Warnings in Maryland, 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.