Alert archive / Pennsylvania / Mesoscale Discussions in 2003
Mesoscale Discussion 1938
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 1:15 PM EDT for 8 counties in New York; 42 counties in Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2003, 1:15 PM EDT (17:15 UTC)
- Expired
- Jul 21, 2003, 3:15 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Chemung County, NY, Schuyler County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Allegheny County, PA, Armstrong County, PA, Blair County, PA, Bradford County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Crawford County, PA, Elk County, PA, Forest County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lackawanna County, PA, Lawrence County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northumberland County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Wayne County, PA, Westmoreland County, PA, Wyoming County, PA
The radar
The State College radar (KCCX), 37 km from the middle of the area, began a volume at 17:18 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 5.3 hours before the alert went out and 193 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
- 1009 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 1:40 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Broome, Chemung, Cortland, Schuyler, Steuben and 2 more | 6 hr |
| Jul 21, 2:46 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Delaware, Greene, Montgomery, Otsego and 5 more | 119 min |
| Jul 21, 3:35 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Chenango, Columbia, Delaware, Dutchess, Greene and 9 more | 6 hr |
| Jul 21, 3:51 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Chemung, Cortland, Schuyler, Steuben and 2 more | 114 min |
| Jul 21, 6:30 PM EDT | Severe Thunderstorm Watch | SPC | Bronx, Kings, Nassau, New York, Orange, Putnam and 4 more | 5 hr |
| Jul 21, 7:51 PM EDT | Mesoscale Discussion | SPC | Albany, Bronx, Columbia, Dutchess, Fulton, Greene and 17 more | 84 min |
| Jul 21, 8:40 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 4 more | 5 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2003Mesoscale Discussions in New York, 2003Every mesoscale discussion in 2003
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.