Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Missoula, MT

August 30, 2017Deer Lodge County, Montana

NWS Missoula, MT issued this special weather statement at Aug 30, 2017, 3:29 PM MDT for Deer Lodge County, Montana. It was in force for 46 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 30, 2017, 3:29 PM MDT (21:29 UTC)
Expired
Aug 30, 2017, 4:15 PM MDT
In force
46 min
Issued by
NWS Missoula, MT

County Deer Lodge County, MT

The radar

The Missoula radar (KMSX), 139 km from the middle of the area, began a volume at 21:28 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, 9.5 hours before the alert went out and 329 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-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 2017-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2017-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3 J/kg
Mixed-layer CIN
-532 J/kg
Mixed-layer LCL
3227 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
80 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 30, 2:37 PM MDT, 52 minutes earlier.

Area forecast discussion, Aug 30, 2:37 PM MDT, 52 minutes before
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In the hours before

Special weather statement, Aug 30, 2:16 PM MDT, 1 hour 13 minutes before
Special Weather Statement
National Weather Service Missoula MT
216 PM MDT WED AUG 30 2017

MTZ005-006-302045-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
216 PM MDT WED AUG 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN RAVALLI COUNTY UNTIL
245 PM MDT...

At 215 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Conner, or 28 miles south of Hamilton, moving
northeast at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Conner, Sula, Spring Gulch campground, and Warm Springs Campground.

LAT...LON 4569 11405 4582 11429 4604 11399 4587 11373
TIME...MOT...LOC 2015Z 223DEG 9KT 4585 11402
Special weather statement, Aug 30, 2:30 PM MDT, 59 minutes before
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Special weather statement, Aug 30, 3:19 PM MDT, 10 minutes before
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Special weather statement, Aug 30, 3:29 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 7:18 PM MDTSpecial Weather StatementMSOMineral27 min
Aug 30, 3:44 AM MDTSpecial Weather StatementMSOSanders46 min
Aug 30, 4:02 AM MDTSpecial Weather StatementMSOLincoln43 min
Aug 30, 4:39 AM MDTSpecial Weather StatementMSOLincoln51 min
Aug 30, 2:16 PM MDTSpecial Weather StatementMSORavalli29 min
Aug 30, 4:41 PM MDTSpecial Weather StatementMSOPowell34 min
Aug 30, 4:46 PM MDTSpecial Weather StatementMSOLincoln44 min
Aug 30, 5:00 PM MDTSpecial Weather StatementMSOMissoula45 min
Aug 30, 5:35 PM MDTSpecial Weather StatementMSOLincoln40 min
Aug 30, 2:30 PM MDTSpecial Weather StatementMSOLewis45 min
Aug 30, 3:19 PM MDTSpecial Weather StatementMSOLewis41 min
Aug 30, 4:05 PM MDTSpecial Weather StatementMSOLewis40 min

Nearby

Special Weather Statements in Montana, 2017Every 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.