Alert archive / Delaware / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 149, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2007, 7:53 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 97 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 27, 2007, 7:53 PM EDT (23:53 UTC)
- Expired
- Jul 27, 2007, 9:30 PM EDT
- In force
- 97 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties New Castle County, DE, Cecil County, MD
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 27, 8:00 PM EDT | TSTM WND DMG | Chesapeake City, MD | A COUPLE OF TREES KNOCKED DOWN IN CHESAPEAKE CITY. |
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, 11.9 hours before the alert went out and 23 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
- 1522 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 651 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 272353 SVRPHI DEC003-MDC015-280130- /O.NEW.KPHI.SV.W.0149.070727T2353Z-070728T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 753 PM EDT FRI JUL 27 2007 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND... NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE... * UNTIL 930 PM EDT * AT 747 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR CECILTON...OR ABOUT 17 MILES SOUTHWEST OF NEWARK...AND MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 6 MILES SOUTHEAST OF ELKTON AND 6 MILES NORTHWEST OF MIDDLETOWN BY 815 PM EDT... GLASGOW BY 825 PM EDT... BEAR BY 835 PM EDT... DELAWARE CITY BY 840 PM EDT... NEW CASTLE...WILMINGTON MANOR AND 6 MILES SOUTHEAST OF NEWPORT BY 855 PM EDT... 7 MILES SOUTHEAST OF ELSMERE BY 900 PM EDT... 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 3950 7606 3934 7593 3950 7559 3977 7554 $$ SZATKOWSKI
1 follow-up statement
000 WWUS51 KPHI 280038 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 835 PM EDT FRI JUL 27 2007 MDC015-280045- /O.CAN.KPHI.SV.W.0149.000000T0000Z-070728T0130Z/ CECIL MD- 835 PM EDT FRI JUL 27 2007 ...THE SEVERE THUNDERSTORM WARNING FOR CECIL COUNTY IS CANCELLED... LAT...LON 3964 7578 3944 7578 3950 7559 3977 7554 $$ DEC003-280130- /O.CON.KPHI.SV.W.0149.000000T0000Z-070728T0130Z/ NEW CASTLE DE- 835 PM EDT FRI JUL 27 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT FOR NORTHERN NEW CASTLE COUNTY... AT 834 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE STRONG THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 60 MPH. ONE STORM WAS LOCATED NEAR GLASGOW...OR ABOUT NEAR NEWARK...MOVING NORTHEAST AT 20 MPH. OTHER STORMS IN THE COUNTY MAY PRODUCE DAMAGING WINDS AND HAIL ALSO. THE SEVERE THUNDERSTORM WILL BE NEAR... BEAR BY 840 PM EDT... BROOKSIDE BY 845 PM EDT... 6 MILES NORTHWEST OF NEW CASTLE BY 855 PM EDT... WILMINGTON MANOR BY 900 PM EDT... NEWPORT BY 905 PM EDT... ELSMERE BY 910 PM EDT... LAT...LON 3964 7578 3944 7578 3950 7559 3977 7554 $$ RPW
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 67 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2007Severe Thunderstorm Warnings in Maryland, 2007Every severe thunderstorm warning in 2007
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.