Alert archive / Pennsylvania / Flash Flood Warnings in 2016

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

February 24, 20164 states

NWS Philadelphia/Mount Holly issued this flash flood warning at Feb 24, 2016, 10:05 PM EST for 4 states. It was in force for 4 hr. 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: Feb 24, 2016, 10:05 PM EST (03:05 UTC)
Expired: Feb 25, 2016, 2:00 AM EST
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 03:07 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
Feb 24, 10:46 PM EST	FLASH FLOOD	Philadelphia, PA	FRANKFORD CREEK ROSE 5 FT TO 7.56 FT WITHIN 45 MIN
Feb 25, 1:32 AM EST	FLASH FLOOD	Bellmawr, NJ	SOUTH BOUND 295 CLOSED AT MILE MARKER 27 DUE TO FLOODING

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.1 hours before the alert went out and 177 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: 27 J/kg
Mixed-layer CIN: -212 J/kg
Mixed-layer LCL: 800 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

893 
WGUS51 KPHI 250305
FFWPHI
DEC001-003-MDC011-029-035-NJC005-007-011-015-033-PAC017-029-045-091-
101-250700-
/O.NEW.KPHI.FF.W.0003.160225T0305Z-160225T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1005 PM EST WED FEB 24 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  WESTERN KENT COUNTY IN CENTRAL DELAWARE...
  NORTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...
  EAST CENTRAL KENT COUNTY IN NORTHEASTERN MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  EASTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 200 AM EST
    
* AT 1001 PM EST...A LINE OF THUNDERSTORMS WERE MOVING OVER THE SAME
  AREA. DOPPLER RADAR INDICATED BETWEEN 1.00 AND 1.50 INCHES OF RAIN
  WAS FALLING. DUE TO SATURATED SOILS, EXCESSIVE RUNOFF WILL OCCUR,
  AND QUICKLY. FLASH FLOODING IS EXPECTED ACROSS PORTIONS OF THE
  WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3962 7562 3962 7561 3946 7559 3935 7549
      3940 7544 3944 7546 3946 7554 3957 7551
      3960 7555 3959 7558 3967 7551 3972 7551
      3965 7561 4031 7515 4012 7475 3936 7531
      3933 7537 3893 7563 3904 7595

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 7:12 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware	33 min
Feb 24, 7:21 PM EST	Areal Flood Advisory	PHI	Chester	4 hr
Feb 24, 7:35 PM EST	Areal Flood Advisory	PHI	Carbon, Monroe	6 hr
Feb 24, 7:39 PM EST	Severe Thunderstorm Warning	PHI	Berks, Chester	36 min
Feb 24, 8:13 PM EST	Special Weather Statement	PHI	Chester, Montgomery	62 min
Feb 24, 8:23 PM EST	Special Weather Statement	PHI	Lehigh, Monroe, Northampton	67 min
Feb 24, 8:42 PM EST	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 2 more	4 hr
Feb 24, 8:47 PM EST	Severe Thunderstorm Warning	PHI	Chester	43 min
Feb 24, 9:18 PM EST	Areal Flood Advisory	PHI	Bucks	4 hr
Feb 24, 9:40 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	35 min
Feb 24, 9:44 PM EST	Areal Flood Warning	PHI	Berks, Chester, Montgomery	10 hr
Feb 24, 9:55 PM EST	Flash Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	4 hr
Feb 24, 10:11 PM EST	River Flood Warning	PHI	Chester	20 hr
Feb 24, 10:32 PM EST	Flash Flood Warning	PHI	Bucks	4 hr
Feb 24, 11:03 PM EST	Severe Thunderstorm Warning	PHI	Bucks	42 min
Feb 25, 12:19 AM EST	River Flood Warning	PHI	Montgomery	14 hr
Feb 25, 12:28 AM EST	River Flood Warning	PHI	Chester, Delaware	18 hr
Feb 25, 12:37 AM EST	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	28 hr
Feb 25, 1:55 AM EST	Areal Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	6 hr
Feb 25, 2:04 AM EST	Areal Flood Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	4 hr
Feb 25, 2:07 AM EST	River Flood Warning	PHI	Berks, Montgomery	8 hr
Feb 25, 2:22 AM EST	Areal Flood Warning	PHI	Bucks	8 hr
Feb 25, 7:41 AM EST	Areal Flood Warning	PHI	Berks, Chester, Montgomery	6 hr
Feb 25, 7:51 AM EST	Areal Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	6 hr
Feb 24, 8:02 PM EST	Special Weather Statement	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	58 min
Feb 24, 8:48 PM EST	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	4 hr
Feb 24, 10:15 PM EST	River Flood Warning	PHI	New Castle	13 hr
Feb 24, 10:50 PM EST	Areal Flood Advisory	PHI	Sussex	4 hr
Feb 25, 1:21 AM EST	River Flood Warning	PHI	New Castle	9 hr
Feb 25, 1:33 AM EST	River Flood Warning	PHI	New Castle	8 hr
Feb 25, 1:10 PM EST	River Flood Warning	PHI	New Castle	8 hr
Feb 24, 7:10 PM EST	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	3 hr
Feb 24, 9:02 PM EST	Special Marine Warning	PHI		58 min
Feb 24, 9:24 PM EST	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	4 hr
Feb 24, 10:06 PM EST	Special Weather Statement	PHI	Sussex	39 min
Feb 24, 10:19 PM EST	Special Marine Warning	PHI		56 min
Feb 24, 10:26 PM EST	Special Weather Statement	PHI	Sussex	34 min
Feb 24, 10:36 PM EST	Special Weather Statement	PHI	Atlantic, Ocean	39 min
Feb 24, 10:49 PM EST	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	4 hr
Feb 24, 10:51 PM EST	Special Weather Statement	PHI	Mercer, Middlesex, Morris, Somerset	54 min
Feb 24, 11:11 PM EST	Special Weather Statement	PHI	Monmouth, Ocean	64 min
Feb 24, 11:22 PM EST	Special Marine Warning	PHI		53 min
Feb 24, 11:25 PM EST	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	15 min
Feb 25, 12:04 AM EST	Special Weather Statement	PHI	Atlantic, Monmouth, Ocean	56 min
Feb 25, 2:26 AM EST	River Flood Warning	PHI	Somerset	33 hr
Feb 25, 2:31 AM EST	River Flood Warning	PHI	Morris, Passaic	31 hr
Feb 25, 10:02 AM EST	River Flood Warning	PHI	Morris	25 hr
Feb 25, 10:13 AM EST	Areal Flood Warning	PHI	Somerset	6 hr
Feb 25, 12:37 PM EST	Areal Flood Warning	PHI	Sussex, Warren	8 hr
Feb 25, 3:28 PM EST	Areal Flood Warning	PHI	Somerset	14 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2016 Flash Flood Warnings in New Jersey, 2016 Flash Flood Warnings in Maryland, 2016 Every flash flood warning in 2016

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.