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The public record for one day, one state

What happened in Pennsylvania on March 23, 2011: hail, wind and tornadoes on record

The public federal storm record holds 158 hail reports, 32 wind reports and 3 tornado reports for March 23, 2011 filed under Pennsylvania. The largest hail measured by a person or an instrument is 2.00″, SOMERSET, PA. The strongest measured gust is 60 mph, SOMERSET, PA. The day's hail was carried by 3 independent sources.

193

Reports on record, hail, wind and tornado

158

Hail reports, all sources

2.00in

Largest hail measured on the ground

3

Independent sources carrying the hail

Where it fell

The counties the day's reports were filed under in Pennsylvania, busiest first, as the source filed them. The size beside each is the largest hail filed there.

  1. ALLEGHENY 2.00″
    • 41 hail
  2. WESTMORELAND 2.00″
    • 34 hail
    • 5 wind
    • 2 tornado
  3. SOMERSET 2.00″
    • 11 hail
    • 5 wind
  4. FAYETTE 1.75″
    • 4 hail
    • 8 wind
  5. BERKS 0.50″
    • 6 hail
  6. BEAVER 1.00″
    • 4 hail
  7. MONTGOMERY 0.25″
    • 3 hail
  8. WASHINGTON Not sized
    • 3 wind
  9. BEDFORD 1.00″
    • 2 hail
  10. INDIANA 1.75″
    • 2 hail
  11. LEHIGH 0.50″
    • 2 hail
  12. BUCKS 0.25″
    • 1 hail

Places in the footprint

Every place in Pennsylvania with a hail report of the day within 10 miles of its centre, by reports. Each links to the place's own hail history; the busiest 40 are listed.

  1. Pittsburgh 49 reports 2.00″
  2. Bellevue 46 reports 1.75″
  3. Greensburg 45 reports 2.00″
  4. Wilkinsburg 45 reports 2.00″
  5. McKeesport 43 reports 2.00″
  6. Carnegie 43 reports 1.75″
  7. West View 43 reports 1.75″
  8. Crafton 43 reports 1.75″
  9. McKees Rocks 43 reports 1.75″
  10. Duquesne 43 reports 2.00″
  11. Baldwin 42 reports 2.00″
  12. Castle Shannon 40 reports 2.00″
28 more places in the footprint
  1. Dormont 40 reports 1.75″
  2. West Mifflin 39 reports 2.00″
  3. Munhall 39 reports 2.00″
  4. Swissvale 39 reports 2.00″
  5. Whitehall 36 reports 2.00″
  6. Brentwood 36 reports 2.00″
  7. Pleasant Hills 34 reports 2.00″
  8. Forest Hills 33 reports 2.00″
  9. Coraopolis 33 reports 1.75″
  10. Latrobe 30 reports 2.00″
  11. White Oak 30 reports 2.00″
  12. Oakmont 30 reports 1.75″
  13. Bethel Park 28 reports 1.75″
  14. Monroeville 27 reports 2.00″
  15. Jeannette 27 reports 2.00″
  16. Fox Chapel 27 reports 1.75″
  17. Franklin Park 24 reports 1.50″
  18. Jefferson Hills 20 reports 2.00″
  19. Murrysville 18 reports 1.75″
  20. Clairton 18 reports 2.00″
  21. Ambridge 15 reports 1.50″
  22. Economy 12 reports 1.50″
  23. Somerset 7 reports 1.00″
  24. Plum 6 reports 1.25″
  25. Aliquippa 6 reports 1.50″
  26. Johnstown 5 reports 2.00″
  27. Reading 3 reports 0.25″
  28. Wyomissing 3 reports 0.25″

By kind of evidence

A day carried by a ground observation, a radar detection and a warning is attested three independent ways. A day carried by one kind from one source is one report. Each report below keeps its own source.

By kind of evidence: the kinds of evidence on record for the day, the number of independent sources of each, and the reports each contributed.
Evidence Sources Reports
Ground observation ×3 193

Largest hail reports on the day

Measured Detected, not measured

Largest hail reports on the day: time, hail size, evidence and where the report was taken.
Time (UTC) Size Evidence County
20:50 2.00″ Ground observation WESTMORELAND
20:50 2.00″ Ground observation Not stated
20:50 2.00″ Ground observation WESTMORELAND
20:38 2.00″ Ground observation ALLEGHENY
20:38 2.00″ Ground observation Not stated
21:25 2.00″ Ground observation SOMERSET
20:38 2.00″ Ground observation ALLEGHENY
21:25 2.00″ Ground observation Not stated

Neighbouring days

The nearest days either side with anything on record in Pennsylvania, the same date in other years, and the hail history the day belongs to.

Previous day with records
March 21, 2011
Next day with records
April 3, 2011
This day in other years
Hail history and data
The next step

The day is on record. The report is that record at an address.

Everything above is the record for the day: enough to know there was a storm, where it was reported and how large. None of it says what reached one roof.

Run the address and the same archive is searched at the property: each report's distance and bearing from the roof, the measured size, the sources by name, and the federal record each figure came from, in a document that states its own method. Ready in minutes.

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The next day of record

A storm day that enters the record in Pennsylvania can be sent within hours of its page: the date, how many independent sources carried it, and the link to the day.

Storm alerts

The next day like this one, sent for Pennsylvania.

A territory is a set of states, or up to 5 places with 30 miles around each. An alert names the largest hail measured and the largest detected, kept apart; a weekly digest lists the last 7 days every Monday. Nothing is sent until a confirmation link is opened.

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How this page is made

What counted
Every hail report in the archive filed on March 23, 2011 under Pennsylvania, with wind and tornado reports counted beside it and the places ranked by the hail reports within 10 miles of each centre. A hail day is a calendar date with at least one report: four sources describing one storm are one afternoon of hail, not four.
Measured and detected
A report from a person or an instrument is measured. A radar-derived size is a detection and is marked as one, here and in every document we issue. The two are never added together.
Severe
A day counts as severe when its largest report reached 1.00″, the National Weather Service criterion. Smaller hail is still on the record, and still on this page.
What this is not
Reports are counted as the sources filed them, so a storm four sources describe is four reports on this page and one afternoon of hail on a place page. This page is the record for a day; it is not a report on any property, and it states no opinion about one.
Terms used on this page
Storm day, independent source, measured and detected: each term this page uses is defined in the glossary as the report prints it.
The record
Searched from 1996 to today. Compiled 27 August 2026 and rebuilt daily as the archive deepens. Records are reproduced as the federal sources published them. The coverage page states what the record holds, by kind and by year.

About this record

Everything here is reproduced from public federal and volunteer weather records, as the agencies and observer networks that publish them released it. Titan Weather compiles the record; it does not observe the weather, and it is not affiliated with any source it cites.

No archive holds everything. Storms cross places where nobody is standing, instruments and observers cover some areas better than others, sources revise their records, and recent reports can take weeks to arrive and settle. Coverage also thins as the years go back: an early quiet stretch may describe who was watching rather than what the weather did. Where this page shows nothing, nothing was found in the sources searched, within the period and area it states. That is not a finding that no weather occurred.

A record sits where its source filed it. Reports made from the ground are commonly logged against a town, a landmark or an offset from one rather than the spot where the measurement was taken, so any distance shown for one carries that source's own location error. Radar detections and warning geometry are instrument-located and do not.

These pages describe the public record near a place or on a date. They do not establish what reached any particular property, and nothing here is insurance, legal or engineering advice.

Settled or provisional
Settled. The last national segment covering this day settled on August 24, 2026, and the figures above are drawn from the settled record.