Alert archive / Maryland / Tornado Warnings in 2010

Tornado Warning 11, NWS Philadelphia/Mount Holly

September 28, 20104 counties in Maryland

NWS Philadelphia/Mount Holly issued this tornado warning at Sep 28, 2010, 9:44 AM EDT for 4 counties in Maryland. It was in force for 31 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: Sep 28, 2010, 9:44 AM EDT (13:44 UTC)
Expired: Sep 28, 2010, 10:15 AM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 76 km from the middle of the area, began a volume at 13:43 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, 1.7 hours before the alert went out and 16 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.

445 
WFUS51 KPHI 281344
TORPHI
MDC015-029-035-041-281415-
/O.NEW.KPHI.TO.W.0011.100928T1344Z-100928T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
944 AM EDT TUE SEP 28 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  CENTRAL KENT COUNTY IN NORTHEAST MARYLAND...
  CENTRAL QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF CENTERVILLE...

* UNTIL 1015 AM EDT

* AT 943 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR WYE
  MILLS...OR 7 MILES SOUTH OF CENTERVILLE...MOVING NORTH AT 45 MPH.

* THE TORNADO WILL BE NEAR...
  CENTERVILLE...CENTREVILLE AND STARR BY 950 AM EDT...
  CARVILLE AND HOPE BY 955 AM EDT...
  STARKEY CORNER...CHURCH HILL AND OLD TOWN BY 1000 AM EDT...
  CHESTERTOWN BY 1005 AM EDT...
  MORGNEC BY 1010 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3938 7608 3938 7606 3941 7605 3942 7602
      3944 7600 3946 7602 3951 7600 3946 7578
      3890 7600 3895 7620
TIME...MOT...LOC 1345Z 197DEG 41KT 3896 7608

$$

HAYES

2 follow-up statements

255 
WWUS51 KPHI 281406
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1006 AM EDT TUE SEP 28 2010

MDC041-281416-
/O.CAN.KPHI.TO.W.0011.000000T0000Z-100928T1415Z/
TALBOT MD-
1006 AM EDT TUE SEP 28 2010

...THE TORNADO WARNING FOR NORTH CENTRAL TALBOT COUNTY IS
CANCELLED...

LAT...LON 3911 7613 3938 7608 3938 7606 3941 7605
      3942 7602 3944 7600 3946 7602 3951 7600
      3946 7578 3907 7593
TIME...MOT...LOC 1406Z 197DEG 41KT 3919 7598

$$

MDC015-029-035-281415-
/O.CON.KPHI.TO.W.0011.000000T0000Z-100928T1415Z/
CECIL MD-KENT MD-QUEEN ANNE'S MD-
1006 AM EDT TUE SEP 28 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT FOR NORTH
CENTRAL QUEEN ANNE'S...CENTRAL KENT AND SOUTHEASTERN CECIL
COUNTIES...

AT 1001 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR STARKEY CORNER...
OR 7 MILES NORTHEAST OF CENTERVILLE...MOVING NORTH AT 45 MPH.

THE TORNADO WILL BE NEAR...
  KENNEDYVILLE...GALENA...9 MILES SOUTHEAST OF BETTERTON AND 9 MILES
  SOUTHWEST OF CECILTON BY 1015 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3911 7613 3938 7608 3938 7606 3941 7605
      3942 7602 3944 7600 3946 7602 3951 7600
      3946 7578 3907 7593
TIME...MOT...LOC 1406Z 197DEG 41KT 3919 7598

$$

HAYES

505 
WWUS51 KPHI 281415
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1015 AM EDT TUE SEP 28 2010

MDC015-029-035-281425-
/O.EXP.KPHI.TO.W.0011.000000T0000Z-100928T1415Z/
CECIL MD-KENT MD-QUEEN ANNE'S MD-
1015 AM EDT TUE SEP 28 2010

...THE TORNADO WARNING FOR NORTH CENTRAL QUEEN ANNE'S...CENTRAL KENT
AND SOUTHEASTERN CECIL COUNTIES HAS EXPIRED...

THE STORM THAT PROMPTED THE WARNING IS WEAKENING.

LAT...LON 3911 7613 3938 7608 3938 7606 3941 7605
      3942 7602 3944 7600 3946 7602 3951 7600
      3946 7578 3907 7593
TIME...MOT...LOC 1415Z 197DEG 41KT 3929 7594

$$

HAYES

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, 10:22 AM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	53 min
Sep 28, 10:41 AM EDT	Special Weather Statement	PHI	Caroline	64 min

Nearby

Tornado Warnings in Maryland, 2010 Every tornado warning in 2010 Tornadoes 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.