Alert archive / Maryland / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 7, 2009, 1:13 PM EDT for Cecil County, Kent County, Queen Anne's County, Maryland. It was in force for 43 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
- May 7, 2009, 1:13 PM EDT (17:13 UTC)
- Expired
- May 7, 2009, 1:56 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Cecil County, MD, Kent County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 78 km from the middle of the area, began a volume at 17:13 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, 5.2 hours before the alert went out and 15 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
- 38 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 071713
SVRPHI
MDC015-029-035-071815-
/O.NEW.KPHI.SV.W.0018.090507T1713Z-090507T1815Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
113 PM EDT THU MAY 7 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
KENT COUNTY IN NORTHEAST MARYLAND...
NORTHEASTERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...
* UNTIL 215 PM EDT
* AT 112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
ROCK HALL...OR 14 MILES NORTHWEST OF CENTERVILLE...AND MOVING
NORTHEAST AT 30 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
LANGFORD BY 125 PM EDT...
CHESTERTOWN AND NEWTOWN BY 130 PM EDT...
MORGNEC BY 140 PM EDT...
KENNEDYVILLE BY 145 PM EDT...
CECILTON AND MASSEY BY 200 PM EDT...
SASSAFRAS BY 205 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 3934 7618 3934 7615 3938 7610 3937 7606
3938 7600 3938 7599 3938 7603 3940 7605
3944 7601 3957 7579 3920 7577 3909 7624
3916 7628
TIME...MOT...LOC 1713Z 236DEG 28KT 3917 7626
$$
TFG2 follow-up statements
000
WWUS51 KPHI 071741
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
141 PM EDT THU MAY 7 2009
MDC015-029-035-071815-
/O.CON.KPHI.SV.W.0018.000000T0000Z-090507T1815Z/
CECIL MD-KENT MD-QUEEN ANNES MD-
141 PM EDT THU MAY 7 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR NORTHEASTERN QUEEN ANNES...KENT AND SOUTHEASTERN CECIL
COUNTIES...
AT 139 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR CECILTON...OR 8 MILES SOUTHWEST OF MIDDLETOWN...MOVING
NORTHEAST AT 30 MPH. A SECOND SEVERE THUNDERSTORM IS JUST NORTH
OF CHESTERTOWN AND WILL AFFECT SOUTHERN KENT AND POSSIBLY NORTHERN
QUEEN ANNES COUNTY.
THE SEVERE THUNDERSTORM WILL BE NEAR...
6 MILES SOUTHEAST OF CAYOTS BY 145 PM EDT...
7 MILES SOUTHEAST OF CHESAPEAKE CITY AND 9 MILES SOUTHEAST OF
BRANTWOOD BY 155 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 3911 7617 3919 7622 3934 7618 3934 7615
3938 7610 3937 7606 3938 7600 3938 7603
3940 7605 3944 7601 3957 7579 3920 7577
TIME...MOT...LOC 1739Z 238DEG 27KT 3939 7585
$$
TFG000
WWUS51 KPHI 071756
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
156 PM EDT THU MAY 7 2009
MDC015-029-035-071807-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-090507T1815Z/
CECIL MD-KENT MD-QUEEN ANNES MD-
156 PM EDT THU MAY 7 2009
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNES...
KENT AND SOUTHEASTERN CECIL COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM IS NOW IN DELAWARE.
LAT...LON 3911 7617 3919 7622 3934 7618 3934 7615
3938 7610 3937 7606 3938 7600 3938 7603
3940 7605 3944 7601 3957 7579 3920 7577
TIME...MOT...LOC 1757Z 238DEG 27KT 3939 7584
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 1:32 AM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| May 7, 1:22 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 4 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2009Every 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.