Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 165, NWS Philadelphia/Mount Holly

July 27, 2008Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2008, 11:50 AM EDT for Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania. It was in force for 70 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 27, 2008, 11:50 AM EDT (15:50 UTC)
Expired: Jul 27, 2008, 1:00 PM EDT
In force: 70 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 15:53 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.

What was reported inside it

Time	Report	Where	Remark
Jul 27, 11:55 AM EDT	HAIL 0.5	Sinking Spring, PA	MARBLE SIZE HAIL, HALF-INCH IN DIAMETER, WAS REPORTED IN THE SINKING SPRING AREA.
Jul 27, 12:08 PM EDT	TSTM WND GST 59	Reading, PA	A THUNDERSTORM WIND GUST OF 59 MPH WAS MEASURED AT THE READING AIRPORT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 27, 11:26 AM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.8 hours before the alert went out and 228 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1356 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KPHI 271550
SVRPHI
NJC037-041-PAC011-025-077-089-095-271700-
/O.NEW.KPHI.SV.W.0165.080727T1550Z-080727T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1150 AM EDT SUN JUL 27 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHEASTERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  WEST CENTRAL SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  NORTHERN WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 100 PM EDT

* AT 1148 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE HAIL
  AND STRONG WIND GUSTS. THESE STORMS WERE LOCATED ALONG A LINE 
  EXTENDING FROM BERLINSVILLE TO 14 MILES SOUTHWEST OF WOMELSDORF...
  OR ALONG A LINE EXTENDING FROM 11 MILES SOUTHEAST OF LEHIGHTON TO 
  14 MILES NORTH OF LANCASTER...AND MOVING EAST AT 17 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  DANIELSVILLE AND NEFFS BY 1155 AM...
  SCHNECKSVILLE BY NOON...
  LEESPORT BY 1205 PM...
  BEERSVILLE AND LEESPORT BY 1210 PM...
  BEERSVILLE BY 1215 PM...
  CLAUSSVILLE BY 1220 PM...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM SUNDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

LAT...LON 4108 7522 4107 7470 4029 7589 4025 7607
      4028 7611 4036 7621 4036 7623 4038 7626
TIME...MOT...LOC 1550Z 255DEG 15KT 4075 7554 4023 7638

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 11:29 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington	46 min
Jul 27, 11:41 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth	34 min
Jul 27, 12:06 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	54 min
Jul 27, 12:12 PM EDT	Special Marine Warning	PHI		63 min
Jul 27, 12:41 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	49 min
Jul 27, 12:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 27, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	57 min
Jul 27, 1:19 PM EDT	Special Marine Warning	PHI		56 min
Jul 27, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	61 min
Jul 27, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	62 min
Jul 27, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Salem	60 min
Jul 27, 2:06 PM EDT	Areal Flood Advisory	PHI	Monmouth	3 hr
Jul 27, 2:11 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	64 min
Jul 27, 2:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer, Monmouth, Ocean	61 min
Jul 27, 2:17 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	58 min
Jul 27, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	57 min
Jul 27, 2:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	2 hr
Jul 27, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	59 min
Jul 27, 2:38 PM EDT	Special Marine Warning	PHI		67 min
Jul 27, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	67 min
Jul 27, 2:44 PM EDT	Special Marine Warning	PHI		2 hr
Jul 27, 2:50 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	115 min
Jul 27, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	53 min
Jul 27, 3:01 PM EDT	Special Marine Warning	PHI		119 min
Jul 27, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	63 min
Jul 27, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	34 min
Jul 27, 3:49 PM EDT	Special Marine Warning	PHI		56 min
Jul 27, 4:05 PM EDT	Special Marine Warning	PHI		115 min
Jul 27, 4:09 PM EDT	Special Marine Warning	PHI		2 hr
Jul 27, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	60 min
Jul 27, 4:39 PM EDT	Special Marine Warning	PHI		51 min
Jul 27, 4:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 27, 5:45 PM EDT	Special Marine Warning	PHI		90 min
Jul 27, 5:47 PM EDT	Special Marine Warning	PHI		88 min
Jul 27, 12:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Jul 27, 12:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery	56 min
Jul 27, 12:25 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	3 hr
Jul 27, 12:38 PM EDT	Severe Thunderstorm Warning	PHI	Chester	67 min
Jul 27, 12:50 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	3 hr
Jul 27, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	Chester	63 min
Jul 27, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	60 min
Jul 27, 1:34 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Jul 27, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	56 min
Jul 27, 6:44 PM EDT	Areal Flood Advisory	PHI	Chester	72 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Severe Thunderstorm Warnings in New Jersey, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.