Alert archive / Delaware / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 121, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2010, 1:39 PM EDT for Sussex County, Delaware. It was in force for 34 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
- Jul 29, 2010, 1:39 PM EDT (17:39 UTC)
- Expired
- Jul 29, 2010, 2:13 PM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 32 km from the middle of the area, began a volume at 17:39 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 29, 11:54 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.7 hours before the alert went out and 71 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
- 1121 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 948 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
127
WUUS51 KPHI 291739
SVRPHI
DEC005-291915-
/O.NEW.KPHI.SV.W.0121.100729T1739Z-100729T1915Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
139 PM EDT THU JUL 29 2010
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 315 PM EDT
* AT 135 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 7 MILES
SOUTHWEST OF GEORGETOWN...AND MOVING EAST AT 10 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
6 MILES NORTH OF GUMBORO AROUND 220 PM EDT...
MILLSBORO AROUND 225 PM EDT...
DAGSBORO AROUND 250 PM EDT...
SELBYVILLE AROUND 310 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. PEOPLE OUTSIDE SHOULD MOVE INTO A
STRONG BUILDING BUT AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
THURSDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.
&&
LAT...LON 3852 7554 3868 7545 3865 7512 3860 7515
3859 7517 3859 7516 3845 7523 3845 7539
TIME...MOT...LOC 1739Z 291DEG 8KT 3859 7544
$$
KRUZDLO1 follow-up statement
459
WWUS51 KPHI 291813
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 PM EDT THU JUL 29 2010
DEC005-291823-
/O.CAN.KPHI.SV.W.0121.000000T0000Z-100729T1915Z/
SUSSEX DE-
213 PM EDT THU JUL 29 2010
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY IS
CANCELLED...
THE STORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER
SEVERE.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM
EDT THURSDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND
SOUTHERN NEW JERSEY.
LAT...LON 3852 7554 3868 7545 3865 7512 3860 7515
3859 7517 3859 7516 3845 7523 3845 7539
TIME...MOT...LOC 1813Z 291DEG 8KT 3856 7535
$$
NIERENBERGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 1:20 PM EDT | Special Weather Statement | PHI | Sussex | 55 min |
| Jul 29, 2:28 PM EDT | Special Weather Statement | PHI | Kent, New Castle, Sussex | 92 min |
| Jul 29, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 41 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2010Every severe thunderstorm warning in 2010
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.