Alert archive / Delaware / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 79, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 15, 2009, 6:17 PM EDT for Sussex County, Delaware. It was in force for 39 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
- Jun 15, 2009, 6:17 PM EDT (22:17 UTC)
- Expired
- Jun 15, 2009, 6:56 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 29 km from the middle of the area, began a volume at 22:17 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.3 hours before the alert went out and 80 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
- 1093 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -66 m²/s²
- 0-3 km storm-relative helicity
- -54 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 152217 SVRPHI DEC005-152315- /O.NEW.KPHI.SV.W.0079.090615T2217Z-090615T2315Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 617 PM EDT MON JUN 15 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE... * UNTIL 715 PM EDT * AT 615 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR SEAFORD...OR 15 MILES WEST OF GEORGETOWN...AND MOVING SOUTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... SEAFORD AROUND 635 PM EDT... LAUREL AROUND 705 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT 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. HEAVY RAIN WILL FALL FROM THIS STORM WHICH MAY CAUSE WATER TO POND ON ROADS AND ALSO FLOODING OF POOR DRAINAGE AREAS. && LAT...LON 3873 7571 3874 7564 3846 7549 3846 7570 TIME...MOT...LOC 2216Z 344DEG 11KT 3870 7567 $$ GORSE/DEFINO
1 follow-up statement
000 WWUS51 KPHI 152256 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 656 PM EDT MON JUN 15 2009 DEC005-152304- /O.CAN.KPHI.SV.W.0079.000000T0000Z-090615T2315Z/ SUSSEX DE- 656 PM EDT MON JUN 15 2009 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX COUNTY IS CANCELLED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED, THEREFORE THE WARNING HAS BEEN CANCELLED. HOWEVER, PEA SIZE HAIL AND HEAVY RAIN CAN STILL OCCUR WITH THIS STORM ALONG WITH SOME CLOUD TO GROUND LIGHTNING. LAT...LON 3873 7571 3874 7564 3846 7549 3846 7570 TIME...MOT...LOC 2254Z 344DEG 11KT 3859 7563 $$ GORSE/DEFINO
Nearby
Severe Thunderstorm Warnings in Delaware, 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.