297
FNUS76 KPDT 281755
FWSPDT

Spot Forecast for walla walla special...walla walla co
National Weather Service Pendleton OR
1055 AM PDT Thu May 28 2026

Forecast is based on forecast start time of 1100 PDT on May 28.
***Thunderstorms imply gusty and erratic winds      ***
***Winds are 20 foot 10-minute averages             ***
***CWR: Chance of wetting rain 0.10 or greater      ***
***Ventilation Index is derived from transport wind
   multiplied by the mixing height in 100`s of ft.
   Categories are a generalized indicator only:
   low (< 200), moderate (200-500), high (500-700),
   and very high (> 700).                           ***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...

Sunny and relatively hot temperatures this afternoon will give way to greater
chances for thunderstorms and potentially severe wind gusts this evening. A line
of scattered thunderstorms are expected to translate across the Blue mountains by
late this afternoon bringing about a 15 to 30 % chances for erratic thunderstorm outflow
winds in the 60 to 70 mph range, generally in the (as early as 1 pm This afternoon)
to (as late a 9 PM This evening). From 3 to 7 pm there is about a 1-2% chance for
a Tornado, and up to 20% chance for hail in the nickel to quarter diameter size.
In the abscence of thunderstorms, please see the winds in the table for
wind speeds and gusts.


.REST OF TODAY...

Sky/weather.........Sunny (15-25 percent) then becoming partly
                    sunny (65-75 percent). Showers likely and
                    chance of thunderstorms late in the afternoon.
Chance of pcpn......60 percent.
Chance of lightning.38 percent.
Max temperature.....89-92.
Min humidity........41-46 percent.
Surface winds (mph).Northwest winds 6 to 9 mph shifting to the
                    north 6 to 10 mph late in the afternoon, then
                    shifting to the east 6 to 9 mph late in the
                    afternoon.
Mixing height.......4500 ft AGL.
Transport winds.....North 6 to 8 mph shifting to the east around 10
                    mph late in the afternoon.

TIME (PDT)      11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P
Chc of ltng (%).0   0   0   10  10  10  40  40  40  20  20  20
Temp............77  82  83  85  87  87  87  86  82  75  69  66
RH..............52  49  48  47  46  47  46  45  50  69  80  83
Surface wnd dir.NW  N   N   N   N   N   E   S   SE  SE  SE  SE
Surface wnd spd.6   6   6   8   8   9   9   10  14  16  14  10
Surface wnd gst.    7   7   9   10  10  10  14  17  20  15  12

.TONIGHT...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    mostly clear (20-30 percent). Rain showers
                    likely and chance of thunderstorms early in the
                    evening, then chance of rain showers and slight
                    chance of thunderstorms early in the evening.
Chance of pcpn......60 percent.
Chance of lightning.38 percent.
Min temperature.....56-59.
Max humidity........81-86 percent.
Surface winds (mph).Southeast winds 6 to 16 mph.
Mixing height.......500 ft AGL in the evening and overnight then
                    500 ft AGL early in the morning.
Transport winds.....Southeast 10 to 13 mph shifting to the south 7
                    to 12 mph late in the evening.

$$
Forecaster...Russell
Requested by...chris lee
Type of request...OTHER
.TAG 2614610.0/PDT
.DELDT 05/28/26
.FormatterVersion 2.0.0
.EMAIL clee@wwcowa.gov