Alert archive / Maryland / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 161, NWS Philadelphia/Mount Holly

September 28, 2010Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 28, 2010, 10:22 AM EDT for Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 53 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 28, 2010, 10:22 AM EDT (14:22 UTC)
Expired: Sep 28, 2010, 11:15 AM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 90 km from the middle of the area, began a volume at 14:22 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.

What was reported inside it

Time	Report	Where	Remark
Sep 28, 11:10 AM EDT	FUNNEL CLOUD	Wilmington, DE	AIRPORT PERSONNEL REPORTED A FUNNEL CLOUD NEAR THE NEW CASTLE COUNTY AIRPORT.
Sep 28, 11:10 AM EDT	TSTM WND DMG	Wilmington, DE	ROOF DAMAGE REPORTED AT THE NEW CASTLE COUNTY GOVERNMENT CENTER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 2.4 hours before the alert went out and 41 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: 246 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 729 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 308 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

034 
WUUS51 KPHI 281422
SVRPHI
DEC001-003-MDC015-029-035-281515-
/O.NEW.KPHI.SV.W.0161.100928T1422Z-100928T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1022 AM EDT TUE SEP 28 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN KENT COUNTY IN CENTRAL DELAWARE...
  SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...MIDDLETOWN...

* UNTIL 1115 AM EDT

* AT 1019 AM 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 CRUMPTON...OR 16 MILES
  SOUTHWEST OF MIDDLETOWN...AND MOVING NORTH AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SASSAFRAS...WARWICK AND CECILTON AROUND 1030 AM EDT...
  BOHEMIAS MILLS...CAYOTS AND MIDDLETOWN AROUND 1035 AM EDT...
  BRANTWOOD AND MOUNT PLEASANT AROUND 1040 AM EDT...
  GLASGOW AND ELKTON AROUND 1045 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3981 7571 3982 7570 3980 7544 3970 7549
      3962 7560 3959 7559 3961 7558 3960 7556
      3918 7580 3923 7602
TIME...MOT...LOC 1422Z 199DEG 49KT 3930 7587

$$

HAYES

1 follow-up statement

406 
WWUS51 KPHI 281504
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1104 AM EDT TUE SEP 28 2010

DEC001-MDC015-029-035-281514-
/O.CAN.KPHI.SV.W.0161.000000T0000Z-100928T1515Z/
KENT DE-CECIL MD-KENT MD-QUEEN ANNE'S MD-
1104 AM EDT TUE SEP 28 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNE'S...
NORTHEASTERN KENT...SOUTHEASTERN CECIL AND EXTREME NORTHWESTERN KENT
COUNTIES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM EDT TUESDAY EVENING
FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3981 7571 3982 7570 3980 7544 3971 7550
      3962 7560 3959 7559 3961 7558 3960 7556
      3956 7565 3960 7575
TIME...MOT...LOC 1504Z 206DEG 35KT 3965 7565

$$

DEC003-281515-
/O.CON.KPHI.SV.W.0161.000000T0000Z-100928T1515Z/
NEW CASTLE DE-
1104 AM EDT TUE SEP 28 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR NORTHERN NEW CASTLE COUNTY...

AT 1102 AM 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 NEAR BEAR...OR 6 MILES
SOUTHEAST OF NEWARK...MOVING NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEWPORT...STANTON...WILMINGTON MANOR AND NEW CASTLE BY 1110 AM
  EDT...
  ELSMERE...WILMINGTON...EDGEMOOR AND TALLEYVILLE BY 1115 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM EDT TUESDAY EVENING
FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3981 7571 3982 7570 3980 7544 3971 7550
      3962 7560 3959 7559 3961 7558 3960 7556
      3956 7565 3960 7575
TIME...MOT...LOC 1504Z 206DEG 35KT 3965 7565

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 6:13 AM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's, Talbot	47 min
Sep 28, 7:02 AM EDT	Special Weather Statement	PHI	Caroline	58 min
Sep 28, 8:26 AM EDT	Special Weather Statement	PHI	Queen Anne's, Talbot	64 min
Sep 28, 8:47 AM EDT	Special Weather Statement	PHI	Cecil, Kent	58 min
Sep 28, 9:13 AM EDT	Tornado Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	32 min
Sep 28, 9:26 AM EDT	Special Weather Statement	PHI	Cecil	64 min
Sep 28, 9:44 AM EDT	Tornado Warning	PHI	Cecil, Kent, Queen Anne's, Talbot	31 min
Sep 28, 10:41 AM EDT	Special Weather Statement	PHI	Caroline	64 min
Sep 28, 7:33 AM EDT	Special Weather Statement	PHI	Kent, New Castle	57 min
Sep 28, 10:17 AM EDT	Special Weather Statement	PHI	New Castle	58 min
Sep 28, 11:15 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	45 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2010 Severe Thunderstorm Warnings in Delaware, 2010 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.