Alert archive / Pennsylvania / Frost Advisories in 2021
Frost Advisory 4, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this frost advisory at May 10, 2021, 12:44 PM EDT for 5 counties in Pennsylvania. It took effect at May 11, 2021, 2:00 AM EDT. It was in force for 64 min.
The area
The counties it named.
The facts
- Issued
- May 10, 2021, 12:44 PM EDT (16:44 UTC)
- In effect from
- May 11, 2021, 2:00 AM EDT
- Expired
- May 11, 2021, 3:04 AM EDT
- In force
- 64 min
- Issued by
- NWS Pittsburgh, PA
Counties Clarion County, PA, Forest County, PA, Jefferson County, PA, Mercer County, PA, Venango County, PA
The radar
The Pittsburgh radar (KPBZ), 104 km from the middle of the area, began a volume at 16:43 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
Pittsburgh, PA (KPIT), launched 12:00Z, 4.7 hours before the alert went out and 111 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 696 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- -125 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
062 WWUS71 KPBZ 101644 NPWPBZ URGENT - WEATHER MESSAGE National Weather Service Pittsburgh PA 1244 PM EDT Mon May 10 2021 PAZ007>009-015-016-110145- /O.NEW.KPBZ.FR.Y.0004.210511T0600Z-210511T1200Z/ Mercer-Venango-Forest-Clarion-Jefferson PA- Including the cities of Sharon, Hermitage, Grove City, Oil City, Franklin, Tionesta, Clarion, Punxsutawney, and Brookville 1244 PM EDT Mon May 10 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM EDT TUESDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Mercer, Venango, Forest, Clarion and Jefferson PA Counties. * WHEN...From 2 AM to 8 AM EDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
2 follow-up statements
755 WWUS71 KPBZ 102259 NPWPBZ URGENT - WEATHER MESSAGE National Weather Service Pittsburgh PA 659 PM EDT Mon May 10 2021 PAZ007>009-015-016-110700- /O.CON.KPBZ.FR.Y.0004.210511T0600Z-210511T1200Z/ Mercer-Venango-Forest-Clarion-Jefferson PA- Including the cities of Sharon, Hermitage, Grove City, Oil City, Franklin, Tionesta, Clarion, Punxsutawney, and Brookville 659 PM EDT Mon May 10 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM EDT TUESDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Mercer, Venango, Forest, Clarion and Jefferson PA Counties. * WHEN...From 2 AM to 8 AM EDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
463 WWUS71 KPBZ 110704 NPWPBZ URGENT - WEATHER MESSAGE National Weather Service Pittsburgh PA 304 AM EDT Tue May 11 2021 PAZ007>009-015-016-110815- /O.CAN.KPBZ.FR.Y.0004.000000T0000Z-210511T1200Z/ Mercer-Venango-Forest-Clarion-Jefferson PA- Including the cities of Sharon, Hermitage, Grove City, Oil City, Franklin, Tionesta, Clarion, Punxsutawney, and Brookville 304 AM EDT Tue May 11 2021 ...FROST ADVISORY IS CANCELLED... Cloud coverage has kept temperatures from falling as much as previously expected and widespread frost is no longer a threat. Therefore, the frost advisory has been cancelled. $$
Nearby
Frost Advisories in Pennsylvania, 2021Every frost advisory in 2021
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.