Alert archive / Idaho / Special Weather Statements in 2023

Special Weather Statement, NWS Boise, ID

August 5, 2023Owyhee County, Idaho

NWS Boise, ID issued this special weather statement at Aug 5, 2023, 12:21 AM MDT for Owyhee County, Idaho. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 5, 2023, 12:21 AM MDT (06:21 UTC)
Expired: Aug 5, 2023, 1:00 AM MDT
In force: 39 min
Issued by: NWS Boise, ID
Hail: 0.00 in
Wind: 50

County Owyhee County, ID

The radar

The Boise radar (KCBX), 128 km from the middle of the area, began a volume at 06:21 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.

The nearest sounding before it

Elko, NV (KLKN), launched 00:00Z, 6.4 hours before the alert went out and 222 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 142 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 3355 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 4, 2:09 PM MDT, 10 hours 12 minutes earlier.

Area forecast discussion, Aug 4, 2:09 PM MDT, 10 hours 12 minutes before

Area Forecast Discussion
National Weather Service Boise ID
209 PM MDT Fri Aug 4 2023

.SHORT TERM...Tonight through Sunday night...The atmosphere is
destabilizing late this afternoon across the southern half of
our forecast area... especially in southern Harney and Malheur
counties where it has been sunny for most of the day.
Thunderstorms will develop and increase in coverage later this
afternoon and evening. A red flag warning for abundant lightning
on the Oregon side remains in effect. Meanwhile, it is more
stable in the northern half of of our CWA where it has remained
cloudy and surface temperatures are cooler. Drier air will
spread northward overnight and thunderstorms will be less
numerous on Saturday with mostly dry conditions expected by
Sunday.

.LONG TERM...Monday through Friday...The upper level flow will
be zonal...from west to east...through the period and moisture
will be limited. This will bring a period of mostly dry weather
to southwestern Idaho and southeastern Oregon. Temperatures
will be a few degrees below normal for the first part of the
week and then warm up a bit later next week as the zonal flow
starts to transition back to a ridge over the western U.S.

&&

.AVIATION...Mainly VFR. Scattered thunderstorms developing
during the afternoon and continuing into the evening across
southern portions of Oregon and Idaho...mainly south of a KBNO-
KBOI-KSNT line. Surface winds generally NW- NE 10-20kt during
the afternoon. Thunderstorms capable of producing gusty erratic
outflows up to 45kt and small hail. Winds aloft at 10kft MSL:
NW 5-15k.

Weekend Outlook...Mainly VFR. Isolated showers and
thunderstorms in the afternoon. Surface winds will be light and
variable, except in the vicinity of thunderstorms which will be
capable of producing gusty outflow winds to 35 kts. Winds aloft
at 10kft MSL W 15 to 20 kts.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...Red Flag Warning until 11 PM MDT /10 PM PDT/ this evening
     ORZ636-637.

&&

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

SHORT TERM...MC
LONG TERM....MC
AVIATION.....MC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 6:33 PM MDT	Special Weather Statement	BOI	Owyhee	42 min
Aug 4, 6:56 PM MDT	Special Weather Statement	BOI	Twin Falls	49 min
Aug 4, 10:31 PM MDT	Special Weather Statement	BOI		44 min
Aug 4, 11:29 PM MDT	Special Weather Statement	BOI	Owyhee	46 min
Aug 5, 1:00 AM MDT	Special Weather Statement	BOI	Twin Falls	45 min
Aug 5, 2:56 AM MDT	Special Weather Statement	BOI		49 min
Aug 4, 8:30 PM MDT	Special Weather Statement	BOI	Malheur	45 min
Aug 4, 9:16 PM MDT	Special Weather Statement	BOI	Malheur	29 min

Nearby

Special Weather Statements in Idaho, 2023 Every special weather statement in 2023

Sources

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