Tyson Fire started on July 21 from unknown cause.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 OTX wrote it up.
Tyson Fire started on July 21 from unknown cause.
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 Spokane, WA wrote its last area forecast discussion before the first event at Jul 21, 1:42 PM PST, 1 hour 18 minutes earlier.
Area Forecast Discussion
National Weather Service Spokane WA
242 PM PDT Fri Jul 21 2023
.SYNOPSIS...
A slow cool down begins Saturday with next Tuesday and Wednesday
the coolest days over the next week with highs in the low to mid
80s. Each afternoon will feature breezy gap winds through the
Cascades. Winds will be strongest and most widespread on Monday.
&&
.DISCUSSION...
Today through Sunday: It's another hot day today with
temperatures expected to rise into the upper 90s and low 100s
regionwide. A heat advisory remains in place through 8 PM Friday for the
Lewiston Area as well as Lower Garfield and Asotin Counties. The
ridge of high pressure that has been sitting over us the past
couple days has slowly started exiting eastward while an offshore
low approaches. As the ridge exits, so will the heat.
Temperatures will be slightly cooler in the low 90s tomorrow and
Sunday.
As the center of low pressure moves toward us from the Gulf of
Alaska, the pressure gradient between the exiting ridge and the
approaching low will tighten causing winds to pick up this evening.
Gusts of 15 to 20 mph are expected for the Spokane area, Lewiston
area, and Central Idaho Panhandle. The Basin, Waterville Plateau,
Okanogan Valley, and Northern Idaho Panhandle will see gusts of
25 to 35 mph.
Tonight's increase in winds will coincide with a drying out of
the atmosphere. Relative humidity will drop into the teens and low
20s, and precipitable water values will be around 70% of normal.
In addition, vegetation (also known as fuels for wildfires) will
be particularly dry due to the heat yesterday and today. Breezy
winds will continue through the weekend and into early next week.
While wind speeds won't be all that impressive, they will increase
the risk of new and existing fires spreading rapidly, especially
with a dry atmosphere and dry fuels in place. /Fewkes
Monday and Tuesday: The low in the eastern Pacific will move
closer to the coast and move into southern BC Tuesday. This will
create breezy winds across central and eastern Washington both
Monday and Tuesday, tho Tuesday winds will be lighter. Sustained
winds 15 mph or greater has a 70% chance or higher of occurring
for a large portion of eastern WA and north ID. Probabilities of
gusts greater than 25 mph is over 60% across the Spokane area,
Palouse, Columbia Basin and Waterville Plateau. Probability is
over 90% for portions of Adams and Lincoln counties. Probabilities
of wind gusts over 35 mph goes down to 10 to 20 percent.
Temperatures will continue to lower a couple of degrees Monday and
Tuesday. Tuesday temps will be at or a couple degrees below
average for the middle/end of July. Highs will be in the low to
mid 80s for most of the region with around 90 in the LC Valley.
Light rain showers remain in the forecast along the crest of the
Cascades. Current instability is lacking at this time, so only
rain mention.
Wednesday through Friday: Models seem to be trending toward a more
troughy pattern for the remainder of the week. Currently only 8%
of the ensemble models show a broad ridge building back in on
Wednesday. Otherwise a dry trough of some kind over or near the
Pac NW will continue. This will keep our temperatures pleasant
with highs in the 80s for the region and low 90s for the LC
Valley. Low temps in the upper 40s to around 60 will make for
beautiful pleasant summer mornings. /Nisbet
&&
.AVIATION...
18Z TAFs: Conditions will remain VFR through the TAF period. Skies
will be clear. Winds will gust out of the west this afternoon and
evening with strongest speeds near the Cascade gaps. Wildfire
smoke from Oregon will continue to drift through the region, but
impacts on visibility will be minimal. /Fewkes
&&
.PRELIMINARY POINT TEMPS/POPS...
Spokane 62 94 60 93 62 89 / 0 0 0 0 0 0
Coeur d'Alene 60 93 58 92 62 89 / 0 0 0 0 0 0
Pullman 59 91 57 91 56 85 / 0 0 0 0 0 0
Lewiston 69 100 68 99 70 96 / 0 0 0 0 0 0
Colville 56 93 55 93 51 88 / 0 0 0 0 0 0
Sandpoint 60 91 58 91 57 87 / 0 0 0 0 0 0
Kellogg 62 90 62 91 66 86 / 0 0 0 0 0 0
Moses Lake 61 97 60 95 59 89 / 0 0 0 0 0 0
Wenatchee 65 94 62 94 64 85 / 0 0 0 0 0 0
Omak 63 98 61 95 62 91 / 0 0 0 0 0 0
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Heat Advisory until 8 PM PDT this evening for Lewiston Area.
WA...Heat Advisory until 8 PM PDT this evening for Lower Garfield and
Asotin Counties.
&&The national radar mosaic for the moment the first event began.
1 wildfire. Local standard time, as filed.
Tyson fire started on July 21 from unknown cause. It burned in 155 acres of timber. It was contained on July 31.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2023Every state in 2023This day in weather historyWarnings in Idaho, July 2023
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 2026-09-24. Each event’s entry at NCEI: 1127053.