Alert archive / Maryland / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 173, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 17, 2010, 2:03 AM EST for 5 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware. It was in force for 57 min. 6 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
- Nov 17, 2010, 2:03 AM EST (07:03 UTC)
- Expired
- Nov 17, 2010, 3:00 AM EST
- In force
- 57 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 07:03 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 |
|---|---|---|---|
| Nov 17, 2:15 AM EST | TSTM WND DMG | 5 N Queen Anne, MD | TREE REPORTED DOWN ACROSS CROUSE MILL ROAD. |
| Nov 17, 2:20 AM EST | TSTM WND DMG | Denton, MD | TREES AND TELEPHONE POLES WERE REPORTED DOWN IN DENTON AND FEDERALSBURG. |
| Nov 17, 2:28 AM EST | TSTM WND GST 51 | Bear, DE | |
| Nov 17, 2:29 AM EST | TSTM WND GST 65 | Bear, DE | DAVIS EQUIPMENT. |
| Nov 17, 2:30 AM EST | TSTM WND GST 40 | Newark, DE | A 40 MPH THUNDERSTORM WIND GUST WAS RECORDED AT THE NEWARK DEOS SITE. |
| Nov 17, 2:48 AM EST | TSTM WND GST 56 | Dover, DE | A 56 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE DOVER AIR FORCE BASE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Nov 17, 12:06 AM EST | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 7.1 hours before the alert went out and 131 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 213 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
297
WUUS51 KPHI 170703
SVRPHI
DEC001-003-005-MDC011-015-029-035-041-170800-
/O.NEW.KPHI.SV.W.0173.101117T0703Z-101117T0800Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
203 AM EST WED NOV 17 2010
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
KENT COUNTY IN CENTRAL DELAWARE...
THIS INCLUDES THE CITY OF DOVER...
CAROLINE COUNTY IN EASTERN MARYLAND...
TALBOT COUNTY IN EASTERN MARYLAND...
THIS INCLUDES THE CITY OF EASTON...
CECIL COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF ELKTON...
KENT COUNTY IN NORTHEAST MARYLAND...
QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF CENTERVILLE...
NEW CASTLE COUNTY IN NORTHERN DELAWARE...
THIS INCLUDES THE CITIES OF...NEWARK...MIDDLETOWN...
SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 300 AM EST
* AT 159 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM WOODLAWN TO KENNEDYVILLE TO CENTERVILLE TO COPPERVILLE TO 16
MILES SOUTH OF OXFORD...OR ALONG A LINE EXTENDING FROM 15 MILES
WEST OF ELKTON TO 17 MILES NORTH OF CENTERVILLE TO CENTERVILLE TO 6
MILES WEST OF EASTON TO 23 MILES SOUTH OF EASTON...AND MOVING EAST
AT 50 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
CHERRY HILL...PLEASANT HILL...ANDORA AND WINDYHILL AROUND 210 AM
EST...
NEWARK...BARKSDALE...APPLETON AND WARWICK AROUND 215 AM EST...
SMITHVILLE AND AGNER AROUND 220 AM EST...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 3848 7571 3865 7572 3867 7576 3869 7590
3856 7604 3867 7622 3938 7612 3942 7602
3951 7599 3965 7616 3979 7563 3966 7555
3962 7560 3960 7555 3946 7558 3924 7538
3907 7539 3883 7521 3877 7507 3854 7514
TIME...MOT...LOC 0703Z 257DEG 56KT 3959 7601 3930 7596
3906 7596 3880 7610 3847 7614
$$
HAYES2 follow-up statements
223
WWUS51 KPHI 170729
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
229 AM EST WED NOV 17 2010
DEC001-003-005-MDC011-015-029-035-041-170800-
/O.CON.KPHI.SV.W.0173.000000T0000Z-101117T0800Z/
KENT DE-CAROLINE MD-CECIL MD-KENT MD-QUEEN ANNE'S MD-TALBOT MD-
SUSSEX DE-NEW CASTLE DE-
229 AM EST WED NOV 17 2010
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EST
FOR NEW CASTLE...SUSSEX...EAST CENTRAL TALBOT...NORTHEASTERN QUEEN
ANNE'S...NORTHEASTERN KENT...EASTERN CECIL...CAROLINE AND KENT
COUNTIES...
AT 226 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM FROM NEWARK TO MIDDLETOWN
TO 15 MILES SOUTHEAST OF EASTON...MOVING EAST AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
BETHEL...WOODLAND BEACH...DOVER SPEEDWAY AND ANDREWSVILLE BY 235 AM
EST...
LAUREL...WOODSIDE EAST...SEAFORD AND RIVERVIEW BY 240 AM EST...
SYCAMORE AND MILFORD BY 245 AM EST...
LAT...LON 3865 7572 3870 7582 3872 7596 3861 7598
3940 7591 3950 7587 3971 7594 3973 7578
3975 7576 3977 7566 3969 7561 3965 7566
3956 7556 3946 7558 3927 7544 3910 7545
3886 7527 3879 7513 3857 7520 3852 7571
TIME...MOT...LOC 0729Z 257DEG 56KT 3975 7565 3947 7561
3922 7561 3897 7576 3864 7581
$$
HAYES835
WWUS51 KPHI 170756
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
256 AM EST WED NOV 17 2010
DEC001-003-005-MDC011-015-029-035-041-170806-
/O.EXP.KPHI.SV.W.0173.000000T0000Z-101117T0800Z/
KENT DE-CAROLINE MD-CECIL MD-KENT MD-QUEEN ANNE'S MD-TALBOT MD-
SUSSEX DE-NEW CASTLE DE-
256 AM EST WED NOV 17 2010
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...SUSSEX...
NORTHEASTERN TALBOT...EASTERN QUEEN ANNE'S...NORTHEASTERN KENT...
EASTERN CECIL...CAROLINE AND KENT COUNTIES WILL EXPIRE AT 300 AM
EST...
THE LINE OF STORMS THAT PROMPTED THE WARNING IS MOVING EAST OF THE
AREA.
LAT...LON 3865 7572 3870 7582 3872 7596 3861 7598
3940 7591 3950 7587 3971 7594 3973 7578
3975 7576 3977 7566 3969 7561 3965 7566
3956 7556 3946 7558 3927 7544 3910 7545
3886 7527 3879 7513 3857 7520 3852 7571
TIME...MOT...LOC 0756Z 257DEG 56KT 3982 7510 3954 7507
3929 7507 3904 7523 3871 7529
$$
HAYESThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 17, 1:08 AM EST | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 52 min |
| Nov 17, 1:59 AM EST | Special Weather Statement | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 61 min |
| Nov 17, 11:19 AM EST | Coastal Flood Statement | PHI | Caroline, Queen Anne's, Talbot | 5 hr |
| Nov 17, 2:57 AM EST | Special Weather Statement | PHI | Sussex | 33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.