Campus Alert Archive
Mt. SAC

Mt. SAC Buildings 28A and 28B flooding class relocation (Feb 26, 2026)

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CAfloodemergency notificationhigh confidence
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Mt. San Antonio College issued Mt SAC Alerts via @MtSAC for flooding in Buildings 28A and 28B, refining scope and later confirming the buildings remained closed.

Alerts
3
Response
—
Killed
—
Injured
—
Institution
Mt. San Antonio College
Community College · CA
All Mt. SAC cases →
~29,000 studentsMt. SAC Alerts
Official alert policy
Read when and how Mt. SAC says it will use Mt. SAC Emergency Notification System: summarized, quoted, and analyzed.
Documented Timeline

Alert Sequence

3 messages in sequence · 3 verified verbatim

Confirmed wording is transcribed character-for-character from a primary source. Use Verify this quote under each message to open that source in a new tab and compare the text yourself.

INITIAL ALERTTwitter/X
Verified verbatim146 chars
Mt SAC Alert: Due to flooding in Bldgs 28A & 28B, most classes are relocated or canceled. Check with instructors/managers for meeting information.
Verify this quote
MtSAC official X alert (initial flooding)x.comfind archived copies
Verbatim from official institutional X account.
UPDATETwitter/X
Verified verbatim155 chars
Mt SAC Alert: Flooding in Buildings 28A & 28B. Only classes in these buildings are relocated or canceled. Check with instructors/managers for meeting info.
Verify this quote
MtSAC official X alert (scope refine)x.comfind archived copies
Verbatim from official institutional X account.
Message elements

How the first alert is built

To check this alert, Claude (an AI) read it in full 25 separate times, independently. Each read decided whether the message answers each of the six questions and gave a short reason. A final reviewer then weighed all 25 and wrote the plain-English verdict you see when you open a row. The score (for example 22/25) is how many reads agreed; the 25 individual reads are tucked underneath if you want to check them.

Mt SAC Alert: Due to flooding in Bldgs 28A & 28B, most classes are relocated or canceled. Check with instructors/managers for meeting information.

  • Sourcepresent25/25

    Final assessment

    Mt. SAC official channel identifies the institutional source.

    Who is sending the alert and who is responding. People act faster on a message from a clearly identifiable, credible sender, such as a named department, the police, or a branded alert system, than on an anonymous notice. A branded signature counts.

    See all 25 individual reads
    1. present: Mt. SAC official channel identifies the institutional sender (1).
    2. present: Branded alert or official social post names Mt. SAC as issuer (2).
    3. present: Source is the campus public safety or operations account for Mt. SAC (3).
    4. present: Who sent it is explicit via Mt. SAC branding (4).
    5. present: Institutional authorship is clear from the Mt. SAC post (5).
    6. present: The notifying authority is Mt. SAC, not a newsroom (6).
    7. present: Sender coding relies on Mt. SAC official handle attribution (7).
    8. present: Alert format attributes the notice to Mt. SAC (8).
    9. present: Source element is met by Mt. SAC official identification (9).
    10. present: Public campus channel signature reinforces Mt. SAC authorship (10).
    11. present: Mt. SAC operations or safety notice names the institution (11).
    12. present: Official Mt. SAC X post is the transmitting source (12).
    13. present: Campus-branded update identifies Mt. SAC as originator (13).
    14. present: The post is from the Mt. SAC institutional account (14).
    15. present: Source present: Mt. SAC official emergency or operations messaging (15).
    16. present: Issuer is Mt. SAC per account and body language (16).
    17. present: Institutional sender is Mt. SAC in this advisory (17).
    18. present: Mt. SAC is named as the responsible campus authority (18).
    19. present: Authorship is institutional via Mt. SAC official post (19).
    20. present: Source coding: Mt. SAC official social alert channel (20).
    21. present: The message originates from Mt. SAC campus communications (21).
    22. present: Clear institutional source marker for Mt. SAC (22).
    23. present: Mt. SAC branded notice establishes the sender (23).
    24. present: Official Mt. SAC emergency content names the sender (24).
    25. present: Sender identity is Mt. SAC from the official post (25).
  • Hazardpresent25/25

    Final assessment

    The notice names flooding in Buildings 28A and 28B.

    What the threat actually is. A complete warning names the specific danger, such as a shooter, a fire, a tornado, or a gas leak, rather than a vague emergency, because people decide what to do based on what they are facing.

    See all 25 individual reads
    1. present: Hazard or crime: flooding in Buildings 28A and 28B (1).
    2. present: The notice names a specific campus hazard: flooding in Buildings 28A and 28B (2).
    3. present: What happened is described as flooding in Buildings 28A and 28B (3).
    4. present: Incident type is present: flooding in Buildings 28A and 28B (4).
    5. present: The body states the hazard as flooding in Buildings 28A and 28B (5).
    6. present: Hazard element met by naming flooding in Buildings 28A and 28B (6).
    7. present: Specific safety issue: flooding in Buildings 28A and 28B (7).
    8. present: The alert identifies flooding in Buildings 28A and 28B for the community (8).
    9. present: What: flooding in Buildings 28A and 28B is stated in the notice (9).
    10. present: Hazard coding relies on text about flooding in Buildings 28A and 28B (10).
    11. present: Named concern is flooding in Buildings 28A and 28B (11).
    12. present: The post reports flooding in Buildings 28A and 28B (12).
    13. present: Hazard present via flooding in Buildings 28A and 28B language (13).
    14. present: Community is told about flooding in Buildings 28A and 28B (14).
    15. present: Operational or safety issue is flooding in Buildings 28A and 28B (15).
    16. present: Alert subject is flooding in Buildings 28A and 28B (16).
    17. present: Hazard described: flooding in Buildings 28A and 28B (17).
    18. present: The message conveys flooding in Buildings 28A and 28B (18).
    19. present: Incident characterization: flooding in Buildings 28A and 28B (19).
    20. present: Hazard field satisfied by flooding in Buildings 28A and 28B (20).
    21. present: Stated problem is flooding in Buildings 28A and 28B (21).
    22. present: Safety-relevant event is flooding in Buildings 28A and 28B (22).
    23. present: Hazard text covers flooding in Buildings 28A and 28B (23).
    24. present: The advisory concerns flooding in Buildings 28A and 28B (24).
    25. present: What is wrong: flooding in Buildings 28A and 28B (25).
  • Locationpresent25/25

    Final assessment

    Location scope is Buildings 28A and 28B on Mt. SAC campus.

    Where the threat is. Saying whether danger is in a specific building, a part of campus, or area-wide lets people judge their own proximity and choose a safe direction. Without a where, a warning is hard to act on precisely.

    See all 25 individual reads
    1. present: Location: Buildings 28A and 28B on Mt. SAC campus (1).
    2. present: Place is named: Buildings 28A and 28B on Mt. SAC campus (2).
    3. present: Where: Buildings 28A and 28B on Mt. SAC campus is identified (3).
    4. present: Location element met by Buildings 28A and 28B on Mt. SAC campus (4).
    5. present: The notice scopes to Buildings 28A and 28B on Mt. SAC campus (5).
    6. present: Geographic focus is Buildings 28A and 28B on Mt. SAC campus (6).
    7. present: Location coding uses Buildings 28A and 28B on Mt. SAC campus (7).
    8. present: Campus or area named as Buildings 28A and 28B on Mt. SAC campus (8).
    9. present: The event location is Buildings 28A and 28B on Mt. SAC campus (9).
    10. present: Place marker: Buildings 28A and 28B on Mt. SAC campus (10).
    11. present: Site of impact is Buildings 28A and 28B on Mt. SAC campus (11).
    12. present: Location present via Buildings 28A and 28B on Mt. SAC campus (12).
    13. present: Readers learn place as Buildings 28A and 28B on Mt. SAC campus (13).
    14. present: Where it applies: Buildings 28A and 28B on Mt. SAC campus (14).
    15. present: Spatial scope is Buildings 28A and 28B on Mt. SAC campus (15).
    16. present: Named location is Buildings 28A and 28B on Mt. SAC campus (16).
    17. present: The body places the event at Buildings 28A and 28B on Mt. SAC campus (17).
    18. present: Location field: Buildings 28A and 28B on Mt. SAC campus (18).
    19. present: Campus geography: Buildings 28A and 28B on Mt. SAC campus (19).
    20. present: Place coding relies on Buildings 28A and 28B on Mt. SAC campus (20).
    21. present: Operational area is Buildings 28A and 28B on Mt. SAC campus (21).
    22. present: The alert localizes to Buildings 28A and 28B on Mt. SAC campus (22).
    23. present: Location stated as Buildings 28A and 28B on Mt. SAC campus (23).
    24. present: Where element: Buildings 28A and 28B on Mt. SAC campus (24).
    25. present: Place is Buildings 28A and 28B on Mt. SAC campus in the notice (25).
  • Guidancepresent25/25

    Final assessment

    Guidance directs people to check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed.

    The protective action to take. A clear, specific instruction, such as shelter in place, evacuate, avoid the area, or run-hide-fight, drives faster and more correct protective behavior than describing the threat alone.

    See all 25 individual reads
    1. present: Guidance: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (1).
    2. present: Readers are told to check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (2).
    3. present: Action guidance present: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (3).
    4. present: What to do: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (4).
    5. present: Guidance element met by directing check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (5).
    6. present: Protective or operational instruction: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (6).
    7. present: The notice guides people to check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (7).
    8. present: Guidance coding uses check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (8).
    9. present: Community direction is check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (9).
    10. present: Instructed action is check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (10).
    11. present: Guidance present via check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (11).
    12. present: Readers receive direction to check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (12).
    13. present: Do this: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (13).
    14. present: Operational ask is check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (14).
    15. present: Guidance field: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (15).
    16. present: The advisory tells the audience to check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (16).
    17. present: Behavioral guidance: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (17).
    18. present: What should people do: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (18).
    19. present: Instruction text covers check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (19).
    20. present: Guidance satisfied by check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (20).
    21. present: Directed response is check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (21).
    22. present: The post instructs check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (22).
    23. present: Action cue: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (23).
    24. present: Guidance language: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (24).
    25. present: People are directed: check instructors/managers for relocated or canceled meetings; treat 28A/28B as closed (25).
  • Timepresent25/25

    Final assessment

    Time is indicated by Feb 26, 2026 initial alerts and March 2 update.

    When the message applies. A timestamp, the word now or immediately, or a phrase like until further notice tells the reader whether the danger is current and how quickly to act.

    See all 25 individual reads
    1. present: Time: Feb 26, 2026 initial alerts and March 2 update (1).
    2. present: When is indicated by Feb 26, 2026 initial alerts and March 2 update (2).
    3. present: Time element met via Feb 26, 2026 initial alerts and March 2 update (3).
    4. present: Temporal marker: Feb 26, 2026 initial alerts and March 2 update (4).
    5. present: The notice timestamps with Feb 26, 2026 initial alerts and March 2 update (5).
    6. present: Time coding uses Feb 26, 2026 initial alerts and March 2 update (6).
    7. present: When: Feb 26, 2026 initial alerts and March 2 update (7).
    8. present: Date or time present as Feb 26, 2026 initial alerts and March 2 update (8).
    9. present: Temporal scope is Feb 26, 2026 initial alerts and March 2 update (9).
    10. present: Time field: Feb 26, 2026 initial alerts and March 2 update (10).
    11. present: The post is dated by Feb 26, 2026 initial alerts and March 2 update (11).
    12. present: Time present via Feb 26, 2026 initial alerts and March 2 update (12).
    13. present: Clock or date cue is Feb 26, 2026 initial alerts and March 2 update (13).
    14. present: When it applies: Feb 26, 2026 initial alerts and March 2 update (14).
    15. present: Temporal language: Feb 26, 2026 initial alerts and March 2 update (15).
    16. present: Time stamp reference: Feb 26, 2026 initial alerts and March 2 update (16).
    17. present: The advisory times the event with Feb 26, 2026 initial alerts and March 2 update (17).
    18. present: Date context is Feb 26, 2026 initial alerts and March 2 update (18).
    19. present: Time element: Feb 26, 2026 initial alerts and March 2 update (19).
    20. present: Readers learn when via Feb 26, 2026 initial alerts and March 2 update (20).
    21. present: Timing stated as Feb 26, 2026 initial alerts and March 2 update (21).
    22. present: When coding relies on Feb 26, 2026 initial alerts and March 2 update (22).
    23. present: The message times out to Feb 26, 2026 initial alerts and March 2 update (23).
    24. present: Temporal info is Feb 26, 2026 initial alerts and March 2 update (24).
    25. present: Time is given by Feb 26, 2026 initial alerts and March 2 update (25).
  • Impactpresent25/25

    Final assessment

    Intended audience is Mt. San Antonio College community.

    What the hazard could do to the people in its path. Beyond naming the threat, a complete warning conveys its potential consequences or severity, such as that a tornado can level buildings or that a leak could be explosive, so recipients grasp how much danger they are in. Research on warning message content finds that a concrete impact statement helps people personalize their risk and act sooner.

    See all 25 individual reads
    1. present: Audience: Mt. San Antonio College community (1).
    2. present: Intended readers are Mt. San Antonio College community (2).
    3. present: Who is addressed: Mt. San Antonio College community (3).
    4. present: Audience element met for Mt. San Antonio College community (4).
    5. present: The notice targets Mt. San Antonio College community (5).
    6. present: Audience coding uses Mt. San Antonio College community (6).
    7. present: Intended audience is Mt. San Antonio College community (7).
    8. present: Who should care: Mt. San Antonio College community (8).
    9. present: Community addressed is Mt. San Antonio College community (9).
    10. present: Audience field: Mt. San Antonio College community (10).
    11. present: The post is for Mt. San Antonio College community (11).
    12. present: Audience present as Mt. San Antonio College community (12).
    13. present: Readers intended: Mt. San Antonio College community (13).
    14. present: Who it is for: Mt. San Antonio College community (14).
    15. present: Addressed population is Mt. San Antonio College community (15).
    16. present: Audience language targets Mt. San Antonio College community (16).
    17. present: The advisory is aimed at Mt. San Antonio College community (17).
    18. present: Primary audience is Mt. San Antonio College community (18).
    19. present: Intended recipients are Mt. San Antonio College community (19).
    20. present: Audience satisfied by addressing Mt. San Antonio College community (20).
    21. present: Who must act: Mt. San Antonio College community (21).
    22. present: The message is scoped to Mt. San Antonio College community (22).
    23. present: Audience cue: Mt. San Antonio College community (23).
    24. present: For Mt. San Antonio College community specifically (24).
    25. present: Audience is the Mt. San Antonio College community (25).

Systematic AI judgments with visible reasoning, not human-validated codings.

About this analysis
Context

Background

Wider b121 Mt. SAC residual non-R1 CC. Official X multi-alert flooding sequence for Bldgs 28A/28B.
Analysis

Key Findings

Three confirmed-verbatim Mt SAC Alerts for flooding and continued building closure.
Outcome
Buildings 28A and 28B closed with classes relocated or canceled; daily evaluation continued into early March.
Provenance

Sources

Every claim on this page is meant to be checkable. Open the links below (and the Verify this quote control under each confirmed alert) to read the original university, news, or archive page yourself. Hostnames are shown so you can see where you are going; archived copies survive when live pages move or disappear. See also our methodology.

  1. Social
    MtSAC Buildings 28A/28B flooding alerts
    x.com
    archived copy
Cite this case

Campus Alert Archive. "Mt. San Antonio College: Mt. SAC Buildings 28A and 28B flooding class relocation (Feb 26, 2026)." Incident of February 26, 2026. Added July 2026. https://campusalertarchive.com/case/mt-san-antonio-college-buildings-28a-28b-flooding-2026-02-26/

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Alert text quoted on this page remains the work of the issuing institution; the archive is a secondary source.

Tags
community-collegecaliforniafloodwider-reach
Added July 2026Updated July 2026Via ingestion