Alert archive / Delaware / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2013, 12:50 PM EDT for Sussex County, Delaware. It was in force for 40 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
- Aug 1, 2013, 12:50 PM EDT (16:50 UTC)
- Expired
- Aug 1, 2013, 1:30 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 7 km from the middle of the area, began a volume at 16:53 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, 4.8 hours before the alert went out and 87 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
- 19 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 551 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
824
WUUS51 KPHI 011650
SVRPHI
DEC005-011730-
/O.NEW.KPHI.SV.W.0085.130801T1650Z-130801T1730Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1250 PM EDT THU AUG 1 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 130 PM EDT
* AT 1249 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM. THE STORM WAS NEAR GREENWOOD...MOVING EAST AT
20 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ELLENDALE AROUND 100 PM EDT...
MILFORD AROUND 105 PM EDT...
MILTON AROUND 115 PM EDT...
SLAUGHTER BEACH AROUND 125 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM...AND
THE STORM WILL AFFECT THE BEACHES. FOR YOUR SAFETY...IMMEDIATELY MOVE
OFF THE BEACH AND SEEK SHELTER INDOORS.
&&
LAT...LON 3885 7554 3886 7552 3888 7551 3891 7548
3892 7544 3892 7542 3894 7540 3895 7534
3894 7531 3893 7532 3879 7515 3876 7552
TIME...MOT...LOC 1650Z 253DEG 18KT 3882 7550
$$
FORECASTER: HEAVENER1 follow-up statement
134 WWUS51 KPHI 011717 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 117 PM EDT THU AUG 1 2013 DEC005-011730- /O.CON.KPHI.SV.W.0085.000000T0000Z-130801T1730Z/ SUSSEX DE- 117 PM EDT THU AUG 1 2013 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT FOR NORTH CENTRAL SUSSEX COUNTY... AT 113 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES NORTHWEST OF MILTON...OR 11 MILES NORTH OF GEORGETOWN...MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL AFFECT... RURAL NORTHERN SUSSEX COUNTY... LAT...LON 3878 7534 3888 7536 3890 7528 3879 7515 TIME...MOT...LOC 1717Z 253DEG 18KT 3886 7533 $$ FORECASTER: HEAVENER
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 3:42 AM EDT | Flash Flood Watch | PHI | New Castle | 14 hr |
| Aug 1, 10:50 AM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 1, 11:57 AM EDT | River Flood Warning | PHI | New Castle | 3 hr |
| Aug 1, 12:17 PM EDT | Special Weather Statement | PHI | Kent | 43 min |
| Aug 1, 12:48 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Aug 1, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 48 min |
| Aug 1, 2:35 PM EDT | Areal Flood Advisory | PHI | Sussex | 3 hr |
| Aug 1, 2:57 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Aug 1, 5:58 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
Nearby
Severe Thunderstorm Warnings in Delaware, 2013Every severe thunderstorm warning in 2013
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.