Campus Alert Archive
ASU

Dust storm and lightning force a halftime stadium evacuation; play resumed hours later

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AZsevere stormadvisoryhigh confidence
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Confirmed Threat

A monsoon haboob followed by lightning and heavy rain hit Mountain America Stadium in Tempe just before 9 p.m. MST at halftime of Arizona State's September 1, 2023 season opener against Southern Utah, prompting the ASU Police Department to evacuate the stadium. Play was suspended for more than two hours before resuming before a nearly empty stadium.

Alerts
3
Response
—
Killed
—
Injured
—
Institution
Arizona State University
Public R1 · AZ
All ASU cases →
~145,000 studentsASU Alert
Official alert policy
Read when and how ASU says it will use ASU Alert: 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 verbatim199 chars
To the fans in attendance, the weather in the area is temporarily delaying the start of the second half. We ask that you leave the stadium and seek shelter. We will give another update in 30 minutes.
Verify this quote
@ASUFootball official X account post at halftime of the September 1, 2023 home opener, quoted verbatim by KSL Sports and multiple outletsx.comarchived copy
Confirmed verbatim from @ASUFootball's official X post, quoted by KSL Sports ('SUU's Season Opener At ASU Hits Weather Delay At Halftime'), Deseret News, and multiple other outlets, all citing identical text.
The evacuation order came as a haboob folded into lightning; fans were directed out of the stadium and to seek shelter.
Arizona does not observe daylight saving time, so the timestamp is MST year-round (UTC-7).
The '30 minute' update promise and the evacuation directive are the core actionable elements of this notification.
UPDATETwitter/X
Verified verbatim145 chars
Lightning strikes continue within 8 miles. Currently at least 45 minutes before we can get players on the field or allow fans back in the stands.
Verify this quote
@ASUFootball official X account update at approximately 9:18 PM MST, quoted by 12news.com ('Storms delay ASU football's home opener, stadium evacuated')x.comarchived copy
Confirmed verbatim from @ASUFootball's official X account, cited by 12news.com as posted 'At 9:18 p.m. Arizona time' during the delay.
The '8 miles' threshold matches ASU's documented lightning policy trigger distance.
The 30-minute window had already extended to 45 minutes by this point due to continued lightning strikes.
ALL CLEARTwitter/X
Verified verbatim161 chars
The news we've all been waiting for! After an eight minute warmup we will start the second half! Fans if you left Mountain America Stadium, you can come back in!
Verify this quote
@ASUFootball official X account post announcing resumption, quoted verbatim by KSL Sports and Arizona Sportsx.comarchived copy
Confirmed verbatim from @ASUFootball's official X post, quoted by KSL Sports ('SUU's Season Opener At ASU Hits Weather Delay At Halftime') and Arizona Sports ('ASU-Southern Utah game to resume following two-hour delay').
Genuine all-clear: invites fans back into the stadium and announces the second half will begin after an eight-minute warmup.
The exclamation-heavy, fan-facing tone reflects ASU Athletics' branding register, notably warmer than most emergency-notification all-clears.
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.

To the fans in attendance, the weather in the area is temporarily delaying the start of the second half. We ask that you leave the stadium and seek shelter. We will give another update in 30 minutes.

  • Sourceabsent1/25

    Final assessment

    Strong consensus: no sender, brand, or agency identifies who issued this stadium message, so the source is absent; one read inferred an event operator.

    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. absent: No sender, agency, or branded signature identifies who issued this stadium message.
    2. absent: No sender, brand, or agency identifies who issued this stadium message.
    3. absent: No sender, agency, or branded signature identifies who issued the message.
    4. absent: No sender tag, university, or agency identifies who issues the message.
    5. absent: No sender name, agency, or branded signature identifies who issued the message.
    6. absent: No sender, agency, or branded signature identifies who is issuing this stadium message.
    7. absent: No branded signature, sender tag, or named authority identifies who is sending the message.
    8. absent: No sender name, branded tag, or issuing authority appears in the text.
    9. absent: No branded signature, agency, or institution names itself as sender.
    10. absent: No sender, branded signature, or named authority appears in the text.
    11. absent: No sender, agency, or branded signature identifies who is issuing this stadium announcement.
    12. present: The "We ask" issuing authority is the stadium/event operator addressing "fans in attendance".
    13. absent: No sender, university name, or agency is identified in the message.
    14. absent: No sender tag, agency, or institution names itself in the text.
    15. absent: No sender, university, agency, or branded signature identifies who issued this stadium message.
    16. absent: No sender, agency, or branded signature identifies who is issuing this stadium message.
    17. absent: No branded signature, agency, or institution names itself as sender.
    18. absent: No sender, signature, or issuing authority is named anywhere in the text.
    19. absent: No sender, branded tag, or named authority appears in the announcement.
    20. absent: No sender, university, or agency is named in the text.
    21. absent: No sender, authority, or branded signature identifies who issued this message.
    22. absent: No sender tag, agency, or institution names itself in the text.
    23. absent: No sender, signature, or issuing authority is identified in the text.
    24. absent: No sender tag, agency, or branded signature identifies who issued this stadium message.
    25. absent: No sender, university, or agency is named anywhere in the text.
  • Hazardpresent25/25

    Final assessment

    Unanimous: it names the weather in the area delaying play and prompting shelter, a stated weather hazard.

    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: It names "the weather in the area" delaying play, implying a severe weather hazard.
    2. present: It names "the weather" delay, and the hazard is weather, though vaguely phrased.
    3. present: It names "the weather" as the threat causing the delay, a specific hazard.
    4. present: It names the threat as "the weather in the area" delaying play, a weather hazard.
    5. present: It names the hazard as "the weather in the area" delaying play, a weather threat prompting shelter.
    6. present: It names "the weather" delaying play and implies a storm threat warranting shelter.
    7. present: It names "the weather", specifically severe enough to delay play and require shelter, as the threat.
    8. present: It names "weather" delaying play and the implied storm threat prompting shelter.
    9. present: It names "the weather" delaying the game as the threat, with the protective context implying severe weather.
    10. present: It names "the weather", and the need to "seek shelter", indicating a weather threat.
    11. present: It names "the weather" delaying play, with shelter directed, indicating a severe weather threat.
    12. present: It names "the weather", and a delay, but no specific hazard like lightning or storm is named, so the threat is unspecified.
    13. present: It names "the weather" delaying play and asks fans to seek shelter, a weather hazard.
    14. present: It names "the weather" delaying play and prompting shelter, identifying a weather threat.
    15. present: It names "the weather in the area" delaying play and tells fans to "seek shelter", a weather hazard.
    16. present: It names "the weather" delaying play and asks fans to seek shelter, indicating a weather threat.
    17. present: It names "the weather" delaying the game, a specific weather hazard.
    18. present: It names "the weather", and a delay, but more specifically points to weather as the threat prompting shelter.
    19. present: It names "weather in the area" delaying the game, a hazard from severe weather.
    20. present: It names "the weather in the area", a specific weather hazard delaying play.
    21. present: It names "the weather", elaborated as a delay-causing condition, as the threat.
    22. present: Names the hazard as "weather in the area" delaying play, a weather threat.
    23. present: Names the threat as "the weather in the area" delaying play, a weather hazard.
    24. present: It names "the weather" delaying play and the need to "seek shelter", indicating a weather hazard.
    25. present: It cites "the weather in the area" delaying play, a specific weather threat.
  • Locationpresent25/25

    Final assessment

    Unanimous: it refers to the stadium and the area as the place to leave, a stated location.

    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: It refers to "the stadium" as the place to leave.
    2. present: It refers to "the stadium" as the place to leave.
    3. present: It refers to "the stadium" and "the area", a place.
    4. present: It refers to "the stadium" as the place to leave.
    5. present: It refers to "the stadium" as the place to leave.
    6. present: It refers to "the stadium" and "the area", specific locations.
    7. present: It refers to "the stadium" and "the area", specific places.
    8. present: It refers to "the stadium" and "the area" as the place.
    9. present: It locates action at "the stadium".
    10. present: It refers to "the stadium" and "the area", specific places.
    11. present: It refers to "the stadium" as the place to leave.
    12. present: It says "the stadium" and "the area", specific places.
    13. present: It refers to "the stadium" and "the area", specific places.
    14. present: It refers to "the stadium" as the place to leave.
    15. present: It refers to "the stadium" and "the area", specific places to leave.
    16. present: It refers to "the stadium" and "the area", specific places.
    17. present: It refers to "the stadium", a specific place.
    18. present: It refers to "the stadium" as the place to leave.
    19. present: It references "the stadium" and "the area" as the location.
    20. present: It refers to "the stadium" as the place to leave.
    21. present: It says "the stadium" and "the area", specific places.
    22. present: Refers to "the stadium" as the location to leave.
    23. present: Refers to "the stadium" and "the area" as the place.
    24. present: It refers to "the stadium" and "the area", specific locations.
    25. present: It references "the stadium" as the place.
  • Guidancepresent25/25

    Final assessment

    Unanimous: it tells fans to leave the stadium and seek shelter, clear protective guidance.

    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: It tells fans to "leave the stadium and seek shelter".
    2. present: It tells fans to "leave the stadium and seek shelter".
    3. present: It tells fans to "leave the stadium and seek shelter", protective actions.
    4. present: It tells fans to "leave the stadium and seek shelter".
    5. present: It instructs fans to "leave the stadium and seek shelter".
    6. present: It tells fans to "leave the stadium and seek shelter", a protective action.
    7. present: It instructs fans to "leave the stadium and seek shelter", a protective action.
    8. present: It instructs fans to "leave the stadium and seek shelter".
    9. present: It instructs fans to "leave the stadium and seek shelter".
    10. present: It tells fans to "leave the stadium and seek shelter", protective actions.
    11. present: It tells recipients to "leave the stadium and seek shelter".
    12. present: It instructs fans to "leave the stadium and seek shelter".
    13. present: It instructs fans to "leave the stadium and seek shelter".
    14. present: It instructs fans to "leave the stadium and seek shelter", a protective action.
    15. present: It tells recipients to "leave the stadium and seek shelter".
    16. present: It tells fans to "leave the stadium and seek shelter", protective actions.
    17. present: It instructs "leave the stadium and seek shelter", protective action.
    18. present: It instructs fans to "leave the stadium and seek shelter".
    19. present: It instructs fans to "leave the stadium and seek shelter".
    20. present: It instructs fans to "leave the stadium and seek shelter".
    21. present: It tells fans to "leave the stadium and seek shelter", a protective action.
    22. present: Tells fans to "leave the stadium and seek shelter".
    23. present: Instructs fans to "leave the stadium and seek shelter".
    24. present: It instructs fans to "leave the stadium and seek shelter", a protective action.
    25. present: It tells fans to "leave the stadium and seek shelter".
  • Timepresent25/25

    Final assessment

    Unanimous: it says the delay is temporary with another update in 30 minutes, recency cues, so timing is present.

    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: It says the delay is "temporarily" with another update "in 30 minutes", a recency cue.
    2. present: It says the delay is "temporarily" with an update "in 30 minutes", a recency cue.
    3. present: It says the start is "temporarily delaying" and promises an update "in 30 minutes".
    4. present: It conveys recency with "temporarily" and "another update in 30 minutes".
    5. present: It conveys timing with "temporarily" and "another update in 30 minutes".
    6. present: It says the start is "temporarily delaying" and promises an update "in 30 minutes", recency cues.
    7. present: It conveys recency with "temporarily delaying" now and "another update in 30 minutes".
    8. present: It conveys recency with "temporarily delaying" and "another update in 30 minutes".
    9. present: It says another update comes "in 30 minutes", a timing cue.
    10. present: It conveys recency with "temporarily delaying" and "another update in 30 minutes".
    11. present: It conveys recency with "temporarily delaying" and an update "in 30 minutes".
    12. present: It says "temporarily" and promises another update "in 30 minutes", recency cues.
    13. present: It says it is delaying "the start of the second half" and promises an update "in 30 minutes", conveying timing.
    14. present: It says the delay is "temporarily" with an update "in 30 minutes", conveying recency.
    15. present: It says the delay is "temporarily" and promises another update "in 30 minutes".
    16. present: It says the start is "temporarily delaying" and promises an update "in 30 minutes", recency cues.
    17. present: It says delay is "temporarily" with an update "in 30 minutes", a recency cue.
    18. present: It uses recency cues "temporarily" and promises an update "in 30 minutes".
    19. present: It says the half is "temporarily delaying" and promises an update "in 30 minutes", a recency cue.
    20. present: It says the half is "temporarily delaying" with another update "in 30 minutes", a recency cue.
    21. present: It references timing with "temporarily" and "another update in 30 minutes".
    22. present: Says "temporarily" and promises an update "in 30 minutes", recency cues.
    23. present: Conveys recency, "temporarily delaying" with another update "in 30 minutes".
    24. present: It conveys recency with "temporarily" and "in 30 minutes", time references.
    25. present: It conveys recency with "temporarily" and "another update in 30 minutes".
  • Impactpresent20/25

    Final assessment

    Present by a 20 to 5 majority: telling fans to leave and seek shelter from the weather conveys danger from the storm; minority notes no specific danger or severity is named.

    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: Tells fans to leave and seek shelter from the weather, implying danger from the storm.
    2. present: Tells fans to leave and seek shelter from weather, implying danger to safety.
    3. present: It tells fans to leave and seek shelter due to weather, implying a danger from the conditions.
    4. present: It tells fans to leave the stadium and seek shelter due to weather, framing it as a safety danger.
    5. absent: Weather delay asking fans to seek shelter without stating any specific danger or consequence.
    6. absent: It asks fans to leave and seek shelter due to weather but states no specific danger or severity.
    7. present: Asks fans to leave and seek shelter from weather, implying danger to people.
    8. present: Tells fans to leave and seek shelter from weather, implying danger to safety.
    9. present: Asks fans to leave and seek shelter from weather, implying danger from the conditions.
    10. present: Tells fans to seek shelter from weather, implying a danger that warrants evacuation of the stadium.
    11. absent: Delays a game and asks fans to seek shelter from weather but states no specific danger or consequence.
    12. present: Asks fans to leave and seek shelter due to weather, indicating danger to those present.
    13. present: Tells fans to leave and seek shelter from weather implying a danger requiring protection.
    14. absent: Asks fans to seek shelter due to weather but states no specific danger or severity.
    15. absent: It tells fans to leave and seek shelter from weather but states no specific danger or consequence.
    16. present: Directs leaving the stadium to seek shelter from weather, implying a danger requiring protection.
    17. present: Directs fans to leave and seek shelter due to weather, implying danger from the conditions.
    18. present: Tells fans to leave and seek shelter from weather, implying danger to safety.
    19. present: It tells fans to leave the stadium and seek shelter due to weather, framing the weather as dangerous enough to require evacuation for safety.
    20. present: Tells fans to leave the stadium and seek shelter due to weather, implying danger from the storm.
    21. present: Instructs fans to leave and seek shelter due to weather, implying danger to people.
    22. present: It tells fans to leave and seek shelter because of weather, implying the weather poses a danger requiring shelter.
    23. present: Tells fans to leave and seek shelter from weather, paired with the danger of the storm.
    24. present: Tells fans to leave and seek shelter from weather, implying a danger to those present.
    25. present: It asks fans to leave and seek shelter from weather, conveying danger to people.

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

About this analysis
Context

Background

Mountain America Stadium (long known as Sun Devil Stadium) sits in the path of Arizona's summer monsoon, which can produce both lightning and walls of blowing dust called haboobs. On September 1, 2023, blowing dust, lightning and wind hit at halftime of ASU's opener against Southern Utah, and the ASU Police Department evacuated the stadium. The State Press reported the suspension came just before 9 p.m. MST, and NBC noted the monsoon dust storm delayed the game for hours; play resumed about 11:18 p.m. MST with only a few hundred fans left, and ASU won 24-21.
Analysis

Key Findings

The delay combined a haboob (dust storm) with lightning, an unusually compound weather hazard for a stadium evacuation
The update cited lightning within eight miles as the reopening constraint, matching ASU's documented lightning policy trigger distance
The suspension just before 9 p.m. MST stretched past two hours, with play resuming about 11:18 p.m. MST
Arizona stays on MST year-round (no DST), so all timestamps use the -07:00 standard offset
Outcome
Play resumed at about 11:18 p.m. MST after a delay exceeding two hours; ASU beat Southern Utah 24-21 in front of a few hundred remaining fans.
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. News
    ASU-Southern Utah game to resume following two-hour delay - Arizona Sports
    arizonasports.com
    archived copy
  2. Student Paper
    Dust Bowl: Rain, lightning and dust storm spoil Sun Devil season opener - The Arizona State Press
    statepress.com
    archived copy
  3. News
    Blowing dust, haboob delay ASU-Southern Utah football coming out of half - ABC15
    abc15.com
    archived copy
  4. national media
    Monsoon triggers massive dust storm in Arizona, delaying college football game - NBC
    nbcnewyork.com
    archived copy
  5. News
    SUU's Season Opener At ASU Hits Weather Delay At Halftime - KSL Sports (quotes @ASUFootball tweets verbatim)
    kslsports.com
    archived copy
  6. Social
    @ASUFootball official X account (source of all three verbatim alert tweets)
    x.com
    archived copy
Cite this case

Campus Alert Archive. "Arizona State University: Dust storm and lightning force a halftime stadium evacuation; play resumed hours later." Incident of September 1, 2023. Added May 2026; last updated July 2026. https://campusalertarchive.com/case/arizona-state-mountain-america-stadium-haboob-delay-2023-09-01/

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

Tags
severe-stormhaboobdust-stormlightningweather-delaystadiumarizonaevacuationmonsoon
Added May 2026Updated July 2026Via ingestion