Alert archive / Delaware / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly

June 13, 2009New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2009, 2:23 PM EDT for New Castle County, Delaware. It was in force for 67 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 13, 2009, 2:23 PM EDT (18:23 UTC)
Expired: Jun 13, 2009, 3:30 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 93 km from the middle of the area, began a volume at 18:24 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.4 hours before the alert went out and 172 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 18 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 989 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 38 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 131823
SVRPHI
DEC003-131930-
/O.NEW.KPHI.SV.W.0068.090613T1823Z-090613T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
223 PM EDT SAT JUN 13 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...

* UNTIL 330 PM EDT

* AT 223 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR BEAR...OR 8 MILES SOUTHEAST OF 
NEWARK...AND   MOVING NORTHEAST AT 5 MPH. VERY HEAVY RAINS WILL FALL 
AND CAUSE FLOODING. WIND GUSTS MAY REACH NEAR 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTHEAST OF STANTON AROUND 300 PM EDT...
  NEW CASTLE AROUND 310 PM EDT...
  WILMINGTON MANOR AND NEWPORT AROUND 315 PM EDT...
  6 MILES SOUTHEAST OF ELSMERE AROUND 330 PM EDT...

LAT...LON 3972 7572 3977 7551 3972 7555 3965 7557
      3962 7560 3960 7560 3959 7559 3953 7560
      3957 7574
TIME...MOT...LOC 1823Z 233DEG 5KT 3961 7563

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 2:27 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jun 13, 3:02 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	58 min
Jun 13, 4:50 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jun 13, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	53 min
Jun 13, 5:21 PM EDT	Tornado Warning	PHI	Sussex	54 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2009 Every severe thunderstorm warning in 2009

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.