Clearing skies allowed a substantial area of radiative cooling to temperatures nearing hard freeze levels of temperatures of 28 degrees or temperatures below freezing for 6 or more hours.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS AJK wrote it up.
Clearing skies allowed a substantial area of radiative cooling to temperatures nearing hard freeze levels of temperatures of 28 degrees or temperatures below freezing for 6 or more hours.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Juneau, AK wrote its last area forecast discussion before the first event at May 13, 2:53 PM AKST, 11 hours 23 minutes earlier.
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</html>4 frost/freeze. Local standard time, as filed.
Cooling overnight allowed the temperature fall below freezing for roughly a 4 hour period, with the Gustavus AWOS recording a temperature of 28 degrees at 04:36 am AKST.
Overnight radiative cooling allowed the temperature to drop below freezing for roughly a 3 hour time frame. At 03:56 am AKST the ASOS at Hoonah reported a temperature of 28 degrees.
Radiative cooling resulted temperatures falling below freezing in Hoonah for roughly a 4 hour period. Temperatures lowered to 28 degrees from 2:56 am to 4:56 am AKST based on the Hoonah ASOS.
Temperatures fell below freezing for a roughly a 4 hour period with the Gustavus AWOS recording a temperature of 28 degrees for a periods from at 3:16 am to 4:36 am AKST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alaska in 2011Every state in 2011This day in weather historyWarnings in Alaska, May 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 306176, 306177, 306180, 306175.