Alert archive / Delaware / Special Weather Statements in 2011
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Sep 23, 2011, 7:21 PM EDT for New Castle County, Delaware. It was in force for 24 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
- Sep 23, 2011, 7:21 PM EDT (23:21 UTC)
- Expired
- Sep 23, 2011, 7:45 PM EDT
- In force
- 24 min
- Issued by
- NWS Philadelphia/Mount Holly
County New Castle County, DE
The radar
The Dover AFB radar (KDOX), 77 km from the middle of the area, began a volume at 23:24 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 163 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
- 709 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 443 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
622
WWUS81 KPHI 232321
SPSPHI
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
721 PM EDT FRI SEP 23 2011
DEZ001-MDZ008-NJZ016-232345-
CECIL MD-NEW CASTLE DE-SALEM NJ-
721 PM EDT FRI SEP 23 2011
...STRONG THUNDERSTORMS WILL AFFECT CECIL...NEW CASTLE AND SALEM
COUNTIES...
AT 719 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 2 MILES SOUTHEAST OF
ELKTON TO 5 MILES NORTHWEST OF MIDDLETOWN TO 9 MILES SOUTHWEST OF
MIDDLETOWN...MOVING EAST AT 25 MPH. THE THUNDERSTORMS WILL BE NEAR
BEAR...GLASGOW AROUND 730 PM...DELAWARE CITY AND ODESSA AROUND 745
PM.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE STORMS.
THIS THUNDERSTORM IS SHOWING SOME WEAK ROTATION, IF IT BECOMES
STRONGER...IT MIGHT BECOME NECESSARY TO ISSUE A TORNADO WARNING.
IF YOU SEE THREATENING WEATHER, PLEASE SEEK SHELTER IMMEDIATELY.
LAT...LON 3947 7588 3965 7587 3977 7541 3959 7543
3945 7553 3950 7557 3952 7554 3957 7553
3958 7556 3946 7558 3943 7554 3941 7556
3937 7577 3938 7577 3938 7594
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 10:13 AM EDT | Areal Flood Advisory | PHI | Gloucester, Salem | 5 hr |
| Sep 23, 10:52 AM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 5 more | 5 hr |
| Sep 23, 5:27 PM EDT | Areal Flood Warning | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 12 hr |
| Sep 23, 5:53 PM EDT | Areal Flood Warning | PHI | Warren | 12 hr |
| Sep 23, 6:31 PM EDT | Special Weather Statement | PHI | Salem | 29 min |
| Sep 23, 6:34 PM EDT | Areal Flood Warning | PHI | Hunterdon, Mercer | 4 hr |
| Sep 23, 6:38 PM EDT | Areal Flood Warning | PHI | Sussex | 6 hr |
| Sep 23, 7:30 PM EDT | Areal Flood Warning | PHI | Burlington, Monmouth, Ocean | 2 hr |
| Sep 23, 7:48 PM EDT | Areal Flood Warning | PHI | Middlesex, Morris, Somerset | 5 hr |
| Sep 23, 11:49 AM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 6 hr |
| Sep 23, 12:47 PM EDT | Flash Flood Warning | PHI | Philadelphia | 2 hr |
| Sep 23, 1:59 PM EDT | Areal Flood Warning | PHI | Carbon | 3 hr |
| Sep 23, 9:17 AM EDT | Areal Flood Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 6 hr |
| Sep 23, 4:33 PM EDT | Areal Flood Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 5 hr |
| Sep 23, 6:21 PM EDT | Special Weather Statement | PHI | Kent | 24 min |
Nearby
Special Weather Statements in Delaware, 2011Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.