Alert archive / Maryland / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2015, 1:42 AM EDT for Cecil County, Maryland; Chester County, Pennsylvania. It was in force for 48 min. 1 report 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
- Jul 1, 2015, 1:42 AM EDT (05:42 UTC)
- Expired
- Jul 1, 2015, 2:30 AM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 104 km from the middle of the area, began a volume at 05:45 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 |
|---|---|---|---|
| Jul 1, 1:53 AM EDT | TSTM WND DMG | Northeast Heights, MD | DOCK WAS DESTROYED AT THE NORTHEAST MARINA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 5.7 hours before the alert went out and 145 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
- 665 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 1402 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
890
WUUS51 KPHI 010542
SVRPHI
MDC015-PAC029-010630-
/O.NEW.KPHI.SV.W.0085.150701T0542Z-150701T0630Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
142 AM EDT WED JUL 1 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CECIL COUNTY IN NORTHEASTERN MARYLAND...
SOUTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 230 AM EDT
* AT 141 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED OVER ABERDEEN...AND MOVING
NORTHEAST AT 40 MPH.
* LOCATIONS IMPACTED INCLUDE...
ELKTON...CALVERT...KENNETT SQUARE...OXFORD...PARKESBURG...NORTH
EAST...WEST GROVE...RISING SUN...CHARLESTOWN...CECILTON...CAYOTS...
ROCK SPRINGS...BOHEMIAS MILLS...BLAKE...PLEASANT HILL...ANDORA...
HOMEVILLE...MOUNT VERNON...GLEN ROY AND RICHARDSMERE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3973 7610 3976 7606 3983 7604 3987 7599
3995 7599 4000 7596 3988 7565 3971 7579
3938 7577 3936 7589 3938 7605 3943 7600
3946 7601 3952 7598 3955 7603 3955 7608
3972 7623
TIME...MOT...LOC 0541Z 208DEG 35KT 3949 7614
$$1 follow-up statement
627
WWUS51 KPHI 010624
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
224 AM EDT WED JUL 1 2015
MDC015-PAC029-010633-
/O.EXP.KPHI.SV.W.0085.000000T0000Z-150701T0630Z/
CECIL MD-CHESTER PA-
224 AM EDT WED JUL 1 2015
...THE SEVERE THUNDERSTORM WARNING FOR CECIL AND SOUTHWESTERN CHESTER
COUNTIES WILL EXPIRE AT 230 AM EDT...
THE STRONGEST PART OF THE SEVERE THUNDERSTORM WHICH PROMPTED THE
WARNING HAS MOVED INTO NEW CASTLE COUNTY. THEREFORE THE WARNING WILL
BE ALLOWED TO EXPIRE.
LAT...LON 3973 7610 3976 7606 3983 7604 3987 7599
3995 7599 4000 7596 3988 7565 3971 7579
3938 7577 3936 7589 3938 7605 3943 7600
3946 7601 3952 7598 3955 7603 3955 7608
3972 7623
TIME...MOT...LOC 0615Z 208DEG 35KT 3949 7614
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 12:56 AM EDT | Special Weather Statement | PHI | Caroline, Cecil, Kent, Queen Anne's | 94 min |
| Jul 1, 1:13 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 62 min |
| Jul 1, 2:14 AM EDT | Areal Flood Advisory | PHI | Cecil | 4 hr |
| Jun 30, 8:03 PM EDT | Special Weather Statement | PHI | Philadelphia | 27 min |
| Jun 30, 8:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 28 min |
| Jun 30, 8:23 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Jun 30, 8:26 PM EDT | Areal Flood Advisory | PHI | Monroe | 4 hr |
| Jul 1, 2:17 AM EDT | Severe Thunderstorm Warning | PHI | Delaware | 43 min |
| Jul 1, 2:47 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jul 1, 2:50 AM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 55 min |
| Jul 1, 4:48 AM EDT | Areal Flood Warning | PHI | Monroe | 10 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2015Severe Thunderstorm Warnings in Pennsylvania, 2015Every severe thunderstorm warning in 2015
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.