Alert archive / Montana / Special Weather Statements in 2024

Special Weather Statement, NWS Missoula, MT

August 5, 2024Sanders County, Montana

NWS Missoula, MT issued this special weather statement at Aug 5, 2024, 3:45 PM MDT for Sanders County, Montana. It was in force for 30 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, 2024, 3:45 PM MDT (21:45 UTC)
Expired: Aug 5, 2024, 4:15 PM MDT
In force: 30 min
Issued by: NWS Missoula, MT
Hail: 0.00 in
Wind: 30

County Sanders County, MT

The radar

The Spokane radar (KOTX), 149 km from the middle of the area, began a volume at 21:44 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

Spokane, WA (KOTX), launched 12:00Z, 9.8 hours before the alert went out and 62 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: 26 J/kg
Mixed-layer CIN: -419 J/kg
Mixed-layer LCL: 1763 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 75 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 Missoula, MT wrote its last area forecast discussion before this special weather statement went out at Aug 5, 2:16 PM MDT, 1 hour 29 minutes earlier.

Area forecast discussion, Aug 5, 2:16 PM MDT, 1 hour 29 minutes before

Area Forecast Discussion
National Weather Service Missoula MT
216 PM MDT Mon Aug 5 2024

.DISCUSSION...The Northern Rockies will remain under southwesterly
upper level flow through Tuesday. A few subtle disturbances will
track through this flow pattern causing clusters of rain showers
and thunderstorms for the next 24-36 hours. The atmosphere appears
to be unstable enough for the remainder of this afternoon and
evening and once again on Tuesday afternoon to allow for the
development of some strong to potentially severe thunderstorms.

A low pressure system will slide into south central Canada by mid
week causing the upper level flow to become westerly to
northwesterly. This flow pattern will keep temperatures near
seasonal with the potential of steady precipitation along the
Continental Divide, especially around Glacier National Park. While
the remainder of the region could experience periods of isolated
to scattered showers and thunderstorms.

The low pressure from Canada will drop into the upper Midwest by
the latter part of the week. This movement of the low will allow
for the ridge of high pressure to slowly strengthen over the
western United States. This ridge will allow for a warming and
drying trend through the weekend.

&&

.AVIATION...
One disturbance is currently causing numerous showers and
thunderstorms to move through western Montana this afternoon. A
second round of convection is starting to develop over northeast
Oregon and southern Idaho. These storms should make their way into
north central Idaho and west central Montana later this evening. A
third round of storms is expected Tuesday morning. These storms
will be capable of gusty erratic winds, moderate to heavy rain and
small hail.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.

&&

In the hours before

Special weather statement, Aug 5, 10:13 AM MDT, 5 hours 32 minutes before

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Special weather statement, Aug 5, 12:20 PM MDT, 3 hours 25 minutes before

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Special weather statement, Aug 5, 1:48 PM MDT, 1 hour 57 minutes before

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Special weather statement, Aug 5, 3:45 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Missoula MT
345 PM MDT Mon Aug 5 2024

MTZ001-004-052215-
Lower Clark Fork Region MT-Kootenai/Cabinet Region MT-
345 PM MDT Mon Aug 5 2024

...A strong thunderstorm will impact portions of south central
Lincoln and northwestern Sanders Counties through 415 PM MDT...

At 345 PM MDT, Doppler radar was tracking a strong thunderstorm near
Noxon, or 29 miles northwest of Thompson Falls, moving northeast at
35 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Noxon and Tuscor.

This includes Highway 200 W between mile markers 10 and 25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4785 11567 4791 11589 4822 11580 4801 11532
TIME...MOT...LOC 2145Z 229DEG 31KT 4795 11570

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 12:20 PM MDT	Special Weather Statement	MSO	Ravalli	25 min
Aug 5, 1:48 PM MDT	Special Weather Statement	MSO	Silver Bow	27 min
Aug 5, 4:13 PM MDT	Special Weather Statement	MSO	Ravalli	47 min
Aug 5, 9:20 AM MDT	Special Weather Statement	MSO	Lewis	40 min
Aug 5, 10:13 AM MDT	Special Weather Statement	MSO	Idaho	47 min
Aug 5, 5:07 PM MDT	Special Weather Statement	MSO	Lewis	38 min
Aug 5, 5:29 PM MDT	Special Weather Statement	MSO	Lemhi	46 min
Aug 5, 5:55 PM MDT	Special Weather Statement	MSO	Idaho	50 min

Nearby

Special Weather Statements in Montana, 2024 Every special weather statement in 2024

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.