Alert archive / Delaware / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 28, 2011, 2:12 PM EDT for Kent County, Sussex County, Delaware. 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
- May 28, 2011, 2:12 PM EDT (18:12 UTC)
- Expired
- May 28, 2011, 3:00 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE
The radar
The Dover AFB radar (KDOX), 14 km from the middle of the area, began a volume at 18:15 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 |
|---|---|---|---|
| May 28, 2:45 PM EDT | TSTM WND DMG | Ellendale, DE | TREE REPORTED DOWN IN ELLENDALE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.2 hours before the alert went out and 88 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
- 117 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
183 WUUS51 KPHI 281812 SVRPHI DEC001-005-281900- /O.NEW.KPHI.SV.W.0073.110528T1812Z-110528T1900Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 212 PM EDT SAT MAY 28 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL KENT COUNTY IN CENTRAL DELAWARE... WESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE... THIS INCLUDES THE CITY OF GEORGETOWN... * UNTIL 300 PM EDT * AT 207 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SYCAMORE...OR 9 MILES SOUTHWEST OF GEORGETOWN...AND MOVING NORTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 6 MILES EAST OF SEAFORD AROUND 220 PM EDT... 6 MILES WEST OF GEORGETOWN AROUND 240 PM EDT... 6 MILES EAST OF BRIDGEVILLE AROUND 245 PM EDT... ELLENDALE AROUND 300 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 GREATEST KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING. && LAT...LON 3858 7563 3896 7559 3891 7528 3855 7541 TIME...MOT...LOC 1812Z 190DEG 13KT 3861 7551 $$ DRAG
2 follow-up statements
306 WWUS51 KPHI 281833 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 233 PM EDT SAT MAY 28 2011 DEC001-005-281900- /O.CON.KPHI.SV.W.0073.000000T0000Z-110528T1900Z/ KENT DE-SUSSEX DE- 233 PM EDT SAT MAY 28 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT FOR WESTERN SUSSEX AND SOUTH CENTRAL KENT COUNTIES... AT 229 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR ELLENDALE...OR 6 MILES NORTHWEST OF GEORGETOWN...MOVING NORTHEAST AT 40 MPH. SO FAR THERE HAVE BEEN NO REPORTS OF DAMAGING WIND OR LARGE HAIL. THE SEVERE THUNDERSTORM WILL BE NEAR... 7 MILES SOUTHEAST OF HOUSTON BY 240 PM EDT... MILFORD BY 245 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING AND VERY HEAVY RAIN IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 3858 7563 3896 7559 3891 7528 3855 7541 TIME...MOT...LOC 1832Z 204DEG 36KT 3879 7544 $$ DRAG
349 WWUS51 KPHI 281859 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 259 PM EDT SAT MAY 28 2011 DEC001-005-281908- /O.EXP.KPHI.SV.W.0073.000000T0000Z-110528T1900Z/ KENT DE-SUSSEX DE- 259 PM EDT SAT MAY 28 2011 ...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUSSEX AND SOUTH CENTRAL KENT COUNTIES WILL EXPIRE AT 300 PM EDT... NO REPORTS OF SEVERE WEATHER WERE RECEIVED. THE STORMS HAVE WEAKENED SINCE 245 PM. HOWEVER SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH 4 PM IN MUCH OF SOUTHERN AND CENTRAL DELAWARE. LAT...LON 3858 7563 3896 7559 3891 7528 3855 7541 TIME...MOT...LOC 1858Z 204DEG 36KT 3903 7530 $$ DRAG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 2:06 PM EDT | Special Weather Statement | PHI | Sussex | 54 min |
| May 28, 2:51 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 99 min |
| May 28, 3:52 PM EDT | Special Weather Statement | PHI | Sussex | 38 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2011Every severe thunderstorm warning in 2011
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.