Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Missoula, MT

July 9, 2017Ravalli County, Montana

NWS Missoula, MT issued this special weather statement at Jul 9, 2017, 10:17 PM MDT for Ravalli County, Montana. It was in force for 43 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: Jul 9, 2017, 10:17 PM MDT (04:17 UTC)
Expired: Jul 9, 2017, 11:00 PM MDT
In force: 43 min
Issued by: NWS Missoula, MT

County Ravalli County, MT

The radar

The Missoula radar (KMSX), 138 km from the middle of the area, began a volume at 04:17 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.

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 4.3 hours before the alert went out and 303 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: 56 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 3424 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 240 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 Jul 9, 2:37 PM MDT, 7 hours 40 minutes earlier.

Area forecast discussion, Jul 9, 2:37 PM MDT, 7 hours 40 minutes before

Area Forecast Discussion
National Weather Service Missoula MT
237 PM MDT Sun Jul 9 2017

.DISCUSSION...The ridge axis has shifted slightly to the east
today putting the Northern Rockies more under a southwesterly flow
pattern. A plume of moisture has traversed under the ridge and is
interacting with an unstable atmosphere from Lemhi county into
southwest Montana. This interaction will allow for the development
of fairly strong thunderstorms. Due to the extremely dry low
levels, the main threat will be gusty and potentially damaging
winds. Temperatures today will once again be hot, but should not
quite reach daily record levels.

A weak disturbance will be moving through the Pacific Northwest
tonight into Monday. This feature will knock down the ridge
causing the upper level flow to become more westerly. A weak cold
front associated with the disturbance will cool temperatures to
seasonal readings. The front appears to become the focal point for
convection during the afternoon/evening hours across southwest
Montana.

The westerly flow persists into Tuesday with temperatures
remaining near normal. Then the models are depicting another
extraordinary ridge of high pressure building over the region for
the remainder of the work week into the weekend. Temperatures
appear to be in the upper 90s to low 100s by Thursday through at
least Sunday.

&&

.AVIATION...Scattered showers and thunderstorms are developing
across Lemhi county into southwest Montana this afternoon. KBTM
and KSMN will be impacted gusty winds and potentially brief heavy
rain between 09/21z-10/00z. The convection will diminish after
sunset this evening. On Monday, westerly winds will be on the
increase during the afternoon with a few showers and thunderstorms
along the Divide.

&&

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

In the hours before

Special weather statement, Jul 9, 6:46 PM MDT, 3 hours 31 minutes before

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Special weather statement, Jul 9, 7:06 PM MDT, 3 hours 11 minutes before

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Special weather statement, Jul 9, 7:46 PM MDT, 2 hours 31 minutes before

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Special weather statement, Jul 9, 8:37 PM MDT, 1 hour 40 minutes before

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Special weather statement, Jul 9, 9:34 PM MDT, 43 minutes before

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Special weather statement, Jul 9, 10:17 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:14 PM MDT	Special Weather Statement	MSO	Powell	46 min
Jul 9, 6:46 PM MDT	Special Weather Statement	MSO	Powell	44 min
Jul 9, 7:06 PM MDT	Special Weather Statement	MSO	Ravalli	39 min
Jul 9, 7:46 PM MDT	Special Weather Statement	MSO	Ravalli	44 min
Jul 9, 8:37 PM MDT	Special Weather Statement	MSO	Deer Lodge	38 min
Jul 9, 9:34 PM MDT	Special Weather Statement	MSO		41 min
Jul 10, 1:29 PM MDT	Special Weather Statement	MSO	Silver Bow	46 min
Jul 10, 3:12 PM MDT	Severe Thunderstorm Warning	MSO	Silver Bow	33 min
Jul 10, 3:40 PM MDT	Special Weather Statement	MSO	Deer Lodge	35 min
Jul 10, 4:12 PM MDT	Special Weather Statement	MSO	Deer Lodge	33 min
Jul 10, 4:16 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Powell, Silver Bow	29 min
Jul 10, 4:20 PM MDT	Special Weather Statement	MSO	Silver Bow	25 min
Jul 10, 4:22 PM MDT	Severe Thunderstorm Warning	MSO	Silver Bow	23 min
Jul 10, 4:51 PM MDT	Special Weather Statement	MSO	Deer Lodge	24 min
Jul 10, 5:04 PM MDT	Special Weather Statement	MSO	Ravalli	26 min
Jul 10, 5:38 PM MDT	Special Weather Statement	MSO	Powell	37 min
Jul 10, 5:45 PM MDT	Special Weather Statement	MSO	Granite	45 min

Nearby

Special Weather Statements in Montana, 2017 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.