Alert archive / Pennsylvania / Fire Weather Watches in 2024

Fire Weather Watch 1, NWS Philadelphia/Mount Holly

October 31, 202410 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this fire weather watch at Oct 31, 2024, 2:50 PM EDT for 10 counties in Pennsylvania. It took effect at Nov 1, 2024, 12:00 PM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Oct 31, 2024, 2:50 PM EDT (18:50 UTC)
In effect from
Nov 1, 2024, 12:00 PM EDT
Expired
Nov 1, 2024, 9:18 AM EDT
In force
Issued by
NWS Philadelphia/Mount Holly

Counties Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 18:49 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

Brookhaven, NY (KOKX), launched 12:00Z, 6.8 hours before the alert went out and 225 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, Brookhaven, NY at 12:00Z on 2024-10-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Brookhaven, NY at 12:00Z on 2024-10-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1436 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 31, 3:15 AM EDTSmall Craft AdvisoryPHI44 hr
Oct 31, 2:50 PM EDTRed Flag WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more28 hr

Nearby

Fire Weather Watches in Pennsylvania, 2024Every fire weather watch in 2024

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.