Alert archive / Idaho / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 22, NWS Boise, ID

August 30, 2017Boise County, Camas County, Elmore County, Idaho

NWS Boise, ID issued this severe thunderstorm warning at Aug 30, 2017, 5:14 PM MDT for Boise County, Camas County, Elmore County, Idaho. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 30, 2017, 5:14 PM MDT (23:14 UTC)
Expired: Aug 30, 2017, 6:00 PM MDT
In force: 46 min
Issued by: NWS Boise, ID
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Boise County, ID, Camas County, ID, Elmore County, ID

The radar

The Boise radar (KCBX), 74 km from the middle of the area, began a volume at 23:17 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 30, 2:25 PM MDT, 2 hours 49 minutes earlier.

Area forecast discussion, Aug 30, 2:25 PM MDT, 2 hours 49 minutes before

Area Forecast Discussion
National Weather Service Boise ID
225 PM MDT Wed Aug 30 2017

.SHORT TERM...Tonight through Friday...Isolated thunderstorms
have begun to developed across Harney and Malheur Counties and
the Owyhee mountains this afternoon producing brief heavy rain.
Storms are expected to expand in coverage through this evening
bringing brief heavy rain and gusty outflow winds. Given the dry
boundary layer, wind gusts up to 50 mph will be possible with the
stronger storms. Storm will diminish from west to east later this
evening as dry air moves in with the upper level trough and cold
front. Cold frontal passage expected Thursday morning with breezy
northwesterly winds behind the front Thursday afternoon. Upper
level ridge moves inland from the west on Friday for warm and dry
conditions. The ridge will likely trap smoke for nearby fires
creating smokey/hazy conditions. Temperatures cool to near normal
on Thursday but warm back to about 5 degrees above normal by
Friday.

.LONG TERM...Friday night through Wednesday...Strong upper ridge
will shift east across Oregon Saturday bringing clear, hot, and dry
weather to our CWA that will last through Labor Day.  Ridge will
remain over the Great Basin Monday through Wednesday allowing
monsoon moisture to spread north into sern Oregon with a slight
chance of thunderstorms there.

&&

.AVIATION...VFR. Thunderstorms in southern Malheur and Harney
Counties moving into southwestern Idaho through 04Z. Storm cores
will have locally heavy rain and outflow wind gusts to 45 kts
through sunset.  Clearing west to east after 04Z. Surface winds
generally 10-15kts across higher terrain of southeast Oregon, and
less than 10kts in the Snake Plain and sheltered valleys. Southwest
winds aloft 10kts at 10k feet msl.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until 1 AM MDT Thursday
     IDZ401>403-421-423-424-426.
OR...Red Flag Warning until 1 AM MDT /midnight PDT/ Thursday ORZ637.

&&

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

SHORT TERM...JDS
LONG TERM....LC/WH
AVIATION.....LC

In the hours before

Local storm report, Aug 30, 3:40 PM MDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
340 PM MDT WED AUG 30 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0315 PM     TSTM WND DMG     BAKER                   44.77N 117.83W
08/30/2017                   BAKER              OR   PARK/FOREST SRVC

            A TRAINED SPOTTER REPORTED RAINFALL OF 0.10 INCH IN 10
            MINUTES, WIND SPEAD AT 12 MPH WITH GUSTS TO 21 MPH , AND
            A VERY BIEF PERIOD WITH DIME-SIZED HAIL. BAKER CITY
            AIRPORT ASOS REPORTED HEAVY RAIN AND THUNDERSTORMS WITH
            WIND FROM THE WEST AT 25 MPH WITH GUSTS TO 35 MPH AND
            PEAK GUST OF 48 MPH.

0315 PM     TSTM WND GST     BAKER                   44.77N 117.83W
08/30/2017  M48 MPH          BAKER              OR   PARK/FOREST SRVC

            A TRAINED SPOTTER REPORTED A THUNDERSTORM WITH RAINFALL
            OF 0.10 OF AN INCH IN 10 MINUTES, WIND STEADY AT 12 MPH
            WITH GUSTS TO 21 MPH, AND A BRIEF PERIOD OF DIME-SIZED
            HAIL. THE BAKER CITY ASOS REPORTED THUNDERSTORMS AND
            HEAVY RAIN WITH WIND FROM THE WEST AT 18 MPH WITH GUSTS
            TO 38 MPH AND A PEAK GUST OF 48 MPH.

&&

WHEWKO

Special weather statement, Aug 30, 4:09 PM MDT, 1 hour 5 minutes before

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Special weather statement, Aug 30, 4:20 PM MDT, 54 minutes before

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Special weather statement, Aug 30, 4:22 PM MDT, 52 minutes before

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Local storm report, Aug 30, 5:02 PM MDT, 12 minutes before

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The office that day

Everything else NWS Boise, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 30, 8:26 AM MDT	Red Flag Warning	BOI	Adams, Boise, Camas, Elmore, Gem, Gooding and 7 more	17 hr
Aug 30, 4:09 PM MDT	Special Weather Statement	BOI	Canyon, Gem, Payette	51 min
Aug 30, 4:20 PM MDT	Special Weather Statement	BOI	Ada	40 min
Aug 30, 4:22 PM MDT	Special Weather Statement	BOI	Elmore	53 min
Aug 30, 4:49 PM MDT	Severe Thunderstorm Warning	BOI	Ada, Boise, Elmore	26 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.