Campus Alert Archive
UH Mānoa

Manoa Valley Floods and a Dorm Empties as Streets Turn to Streams

HIfloodingemergency notificationmedium confidence
Confirmed Threat

After days of heavy rain, a flash flood warning gripped Manoa Valley on March 24, 2026, with the National Weather Service estimating rain at 2 to 4 inches per hour and Manoa Stream running very high. The University of Hawaiʻi at Mānoa asked students and employees to stay inside and off the roads and evacuated Hale Wainani buildings G and H out of an abundance of caution. UH later reported minimal damage and no injuries, with the campus fully reopening the next day.

Alerts
3
Response
—
Killed
0
Injured
0
Institution
University of Hawaiʻi at Mānoa
Public R1 · HI
~18,000 studentsUH Alert
Confirmed Timeline

Alert Sequence

3 messages in sequence

Some alert texts below are approximate reconstructions from news coverage, not confirmed verbatim transcripts. Reconstructed texts are shown in italic with a dashed border. Verified verbatim texts have a solid border and are marked accordingly.

INITIAL ALERTSMS
Approximate reconstruction177 chars
UH Alert: Severe rain and flooding in parts of the Manoa campus. Stay inside and off the roads unless absolutely necessary until further notice. Avoid flooded areas and streams.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed from reporting that UH asked students and employees to 'stay inside and off roads unless absolutely necessary until further notice' citing severe rain and flooding on campus.
Hawaii is on HST (UTC-10) year-round and does not observe daylight saving time.
The 'avoid streams' element reflects the specific hazard in Manoa Valley, where Manoa Stream was running very high during the warning.
isVerbatimConfirmed:false: UH's official archived alert text could not be retrieved, so this paraphrases news quotes of the message.
UPDATESMS
Approximate reconstruction199 chars
UH Alert Update: Out of an abundance of caution, Hale Wainani G and H are being evacuated. Officials are on site addressing flooding in the area. Residents will be notified when it is safe to return.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed update matching reporting that Hale Wainani G and H were evacuated as a precaution and that 'water never reached the facilities,' per a university spokesperson.
The phrase 'out of an abundance of caution' tracks the spokesperson's documented framing of the evacuation decision.
isVerbatimConfirmed:false because the official evacuation message wording was not retrievable from a primary source.
ALL CLEARSMS
Approximate reconstruction199 chars
UH Alert: The flash flood warning for Manoa has been canceled. Hale Wainani residents may return and retrieve belongings. Normal operations will resume; continue to avoid any remaining flooded areas.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed all-clear matching reporting that students were allowed to retrieve items and return once the flash flood warning was canceled.
Qualifies as a true all-clear because it lifts the shelter-in-place and evacuation instructions; the campus fully reopened the next day, Tuesday.
isVerbatimConfirmed:false: no official archived all-clear text was available.
Context

Background

Manoa Valley is one of the wettest populated places in the United States, and the University of Hawaiʻi at Mānoa sits at the base of a steep watershed where Manoa Stream can rise fast. The March 2026 floods capped a multi-week severe-weather stretch the National Weather Service tracked from March 10 to 24. On March 24, floodwaters rushed through the valley, turning campus walkways into streams and submerging cars along East Manoa Road. UH pushed a UH Alert telling people to stay inside and off the roads, then evacuated Hale Wainani buildings G and H as a precaution even though water never reached them. The next day, Hawaii Public Radio reported that the campus saw minimal damage and reopened. The episode shows how an R1 campus uses graduated messaging — shelter, then targeted evacuation, then all-clear — for a fast-onset natural hazard, and how Hawaii's no-DST HST timezone frames every alert timestamp.
Analysis

Key Findings

UH Manoa moved through a textbook graduated sequence for a flash flood: shelter-in-place, then a targeted dorm evacuation, then an all-clear tied to the NWS warning cancellation
The Hale Wainani evacuation was precautionary — water never reached the buildings — illustrating conservative decision-making for a fast-rising stream hazard
The campus reported minimal damage and no injuries and reopened the next day, Tuesday
All timestamps are HST (UTC-10); Hawaii does not observe daylight saving time
Outcome
Hale Wainani G and H were evacuated as a precaution; water never reached the buildings. UH reported minimal campus damage and no injuries. The campus reopened the following day, Tuesday, after the flash flood warning was canceled.
Provenance

Sources

  1. News
    Manoa inundated as flash flooding turns streets into streams - Hawaii News Now
    hawaiinewsnow.com
  2. News
    UH Manoa reports minimal damage after flash flooding - Hawaii Public Radio
    hawaiipublicradio.org
  3. News
    Manoa flooding forces evacuation at Wainani housing complex - KITV
    kitv.com
  4. Official
    March 2026 Severe Weather and Flash Flooding 3/10 to 3/24 - National Weather Service Honolulu
    weather.gov
Tags
floodingflash-floodemergency-notificationhawaiiuh-manoaevacuationshelter-in-placenatural-hazard
Added May 2026Updated May 2026Via ingestion