Alert archive / Delaware / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

July 27, 2018New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 27, 2018, 8:37 AM EDT for New Castle County, Delaware. It was in force for 23 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 27, 2018, 8:37 AM EDT (12:37 UTC)
Expired
Jul 27, 2018, 9:00 AM EDT
In force
23 min
Issued by
NWS Philadelphia/Mount Holly

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 63 km from the middle of the area, began a volume at 12:37 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, 0.6 hours before the alert went out and 162 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.

Skew-T log-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2018-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1842 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2018-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1842 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted.

937 
WWUS81 KPHI 271237
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
837 AM EDT FRI JUL 27 2018

DEZ001-002-MDZ008-012-271300-
Kent-New Castle-Cecil-Kent-
837 AM EDT FRI JUL 27 2018

...A SHOWER WILL AFFECT SOUTHWESTERN NEW CASTLE...NORTHWESTERN
KENT...NORTHEASTERN KENT AND SOUTHEASTERN CECIL COUNTIES...

At 836 AM EDT, a shower was located near Middletown, moving east at
20 mph.

Winds up to 40 mph are possible with this shower.

Locations impacted include...
Middletown, Smyrna, Clayton, Warwick, Sassafras, Delaney Corner,
Green Spring, Bohemias Mills, Woodland Beach, Townsend, Odessa and
Chambersville.

Torrential rainfall is also occurring with this shower, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3945 7587 3951 7556 3949 7559 3944 7558
      3941 7554 3937 7552 3935 7549 3933 7550
      3934 7549 3931 7543 3928 7544 3924 7575
TIME...MOT...LOC 1236Z 258DEG 19KT 3939 7568 

$$

SFJ

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 9:29 AM EDTSpecial Weather StatementPHISalem61 min
Jul 27, 9:50 AM EDTFlash Flood WatchPHIBurlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 7 more13 hr
Jul 27, 10:08 AM EDTSpecial Weather StatementPHICumberland67 min
Jul 27, 10:34 AM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean10 hr
Jul 27, 11:11 AM EDTSpecial Weather StatementPHIAtlantic64 min
Jul 27, 12:10 PM EDTSpecial Weather StatementPHIAtlantic65 min
Jul 27, 12:24 PM EDTAreal Flood AdvisoryPHICape May114 min
Jul 27, 1:15 PM EDTSpecial Weather StatementPHISalem45 min
Jul 27, 1:23 PM EDTSpecial Weather StatementPHIMorris52 min
Jul 27, 1:31 PM EDTSpecial Marine WarningPHI59 min
Jul 27, 1:38 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset4 hr
Jul 27, 2:04 PM EDTSevere Thunderstorm WarningPHIMorris, Somerset41 min
Jul 27, 2:14 PM EDTSevere Thunderstorm WarningPHICumberland, Salem46 min
Jul 27, 2:19 PM EDTSpecial Marine WarningPHI56 min
Jul 27, 2:22 PM EDTSpecial Marine WarningPHI53 min
Jul 27, 2:26 PM EDTAreal Flood AdvisoryPHICumberland, Salem6 hr
Jul 27, 2:40 PM EDTSpecial Marine WarningPHI65 min
Jul 27, 2:59 PM EDTSevere Thunderstorm WarningPHICumberland, Salem46 min
Jul 27, 3:09 PM EDTAreal Flood AdvisoryPHICumberland, Salem6 hr
Jul 27, 3:14 PM EDTSpecial Marine WarningPHI61 min
Jul 27, 3:45 PM EDTSpecial Weather StatementPHICumberland30 min
Jul 27, 4:12 PM EDTSpecial Marine WarningPHI63 min
Jul 27, 4:18 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Gloucester, Salem42 min
Jul 27, 4:19 PM EDTFlash Flood WarningPHICumberland4 hr
Jul 27, 4:25 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset7 hr
Jul 27, 4:32 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Somerset43 min
Jul 27, 4:43 PM EDTAreal Flood AdvisoryPHIMercer5 hr
Jul 27, 4:54 PM EDTFlash Flood WarningPHIMiddlesex4 hr
Jul 27, 5:03 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cumberland4 hr
Jul 27, 5:23 PM EDTSpecial Marine WarningPHI67 min
Jul 27, 5:46 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland, Ocean4 hr
Jul 27, 6:10 PM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Monmouth, Somerset4 hr
Jul 27, 7:14 PM EDTSpecial Marine WarningPHI61 min
Jul 27, 7:15 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Sussex, Warren4 hr
Jul 27, 7:51 PM EDTSpecial Weather StatementPHIAtlantic39 min
Jul 27, 7:55 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Somerset, Warren108 min
Jul 27, 12:17 PM EDTAreal Flood AdvisoryPHICarbon, Monroe2 hr
Jul 27, 12:35 PM EDTFlash Flood WarningPHIMonroe63 min
Jul 27, 1:02 PM EDTAreal Flood AdvisoryPHIBerks3 hr
Jul 27, 1:08 PM EDTSpecial Weather StatementPHIBucks, Montgomery37 min
Jul 27, 1:19 PM EDTAreal Flood AdvisoryPHIBucks, Montgomery4 hr
Jul 27, 1:42 PM EDTSpecial Weather StatementPHIMontgomery48 min
Jul 27, 3:11 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh49 min
Jul 27, 3:47 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh4 hr
Jul 27, 3:54 PM EDTFlash Flood WarningPHIBerks4 hr
Jul 27, 4:27 PM EDTSpecial Weather StatementPHIPhiladelphia33 min
Jul 27, 4:33 PM EDTSpecial Weather StatementPHICarbon, Monroe27 min
Jul 27, 4:44 PM EDTAreal Flood AdvisoryPHICarbon, Monroe7 hr
Jul 27, 5:00 PM EDTFlash Flood WarningPHIMonroe3 hr
Jul 27, 5:13 PM EDTSpecial Weather StatementPHIMonroe47 min
Jul 27, 5:27 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Northampton4 hr
Jul 27, 5:43 PM EDTSpecial Weather StatementPHILehigh47 min
Jul 27, 6:03 PM EDTSevere Thunderstorm WarningPHIChester42 min
Jul 27, 6:06 PM EDTAreal Flood AdvisoryPHIBerks, Chester3 hr
Jul 27, 6:36 PM EDTSpecial Weather StatementPHIBerks39 min
Jul 27, 6:40 PM EDTSevere Thunderstorm WarningPHIBerks50 min
Jul 27, 7:03 PM EDTFlash Flood WarningPHIBerks3 hr
Jul 27, 7:09 PM EDTSevere Thunderstorm WarningPHIChester51 min
Jul 27, 7:37 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Delaware, Lehigh, Montgomery116 min
Jul 27, 7:46 PM EDTSpecial Weather StatementPHIMontgomery44 min
Jul 27, 7:49 PM EDTAreal Flood WarningPHIBerks4 hr
Jul 27, 7:49 PM EDTSpecial Weather StatementPHIBerks41 min
Jul 27, 7:53 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Montgomery110 min
Jul 27, 2:15 PM EDTAreal Flood AdvisoryPHISussex6 hr
Jul 27, 4:19 PM EDTSpecial Weather StatementPHISussex41 min
Jul 27, 5:03 PM EDTSpecial Weather StatementPHIKent27 min
Jul 27, 5:08 PM EDTAreal Flood AdvisoryPHIKent4 hr
Jul 27, 5:09 PM EDTAreal Flood AdvisoryPHISussex3 hr
Jul 27, 5:44 PM EDTAreal Flood AdvisoryPHIKent, New Castle3 hr
Jul 27, 6:53 PM EDTSpecial Weather StatementPHINew Castle52 min

Nearby

Special Weather Statements in Delaware, 2018Every special weather statement in 2018

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.