Alert archive / Montana / Special Weather Statements in 2013

Special Weather Statement, NWS Missoula, MT

July 17, 2013Missoula County, Montana

NWS Missoula, MT issued this special weather statement at Jul 17, 2013, 5:39 PM MDT for Missoula County, Montana. It was in force for 51 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 17, 2013, 5:39 PM MDT (23:39 UTC)
Expired: Jul 17, 2013, 6:30 PM MDT
In force: 51 min
Issued by: NWS Missoula, MT

County Missoula County, MT

The radar

The Missoula radar (KMSX), 44 km from the middle of the area, began a volume at 23:41 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 12:00Z, 11.7 hours before the alert went out and 218 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1289 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 17, 2:13 PM MDT, 3 hours 26 minutes earlier.

Area forecast discussion, Jul 17, 2:13 PM MDT, 3 hours 26 minutes before

Area Forecast Discussion
National Weather Service Missoula MT
213 PM MDT Wed Jul 17 2013

...Very HOT and Dry conditions Thursday through Monday...

.DISCUSSION...Thunderstorms are developing over the region with a
weak storm system moving over northwest Montana. Some of these
thunderstorms may produce local heavy rain, hail and wind gusts to
50 mph. Check out our twitter feed for real-time information of
location and intensity of storms. Convection will end later this
evening as a drier airmass and high pressure move into the region.

Thursday through Sunday...High pressure will persist through the
weekend resulting in very hot temperatures and dry conditions.

Forecast highs:
Thursday and Friday...Mid 90s
Saturday and Sunday...Mid and upper 90s.

90 plus degree weather will continue through the middle of next
week. One possible change to the region may be a brief flattening
of the ridge on Monday or Tuesday which could increase west winds
and pose a potential fire weather impact. Confidence is low right
now for this scenario as little agreement exists among the current
weather models.

&&

.AVIATION...Thunderstorms, some possibly severe, developing over
the region may produce hail, gusty winds and locally heavy rain.
All Northern Rockies terminals have a potential for thunderstorms
through 18/0300z.

&&

.Climate...The overnight low Wednesday morning was 70 degrees. This
makes it only the third time in the history of Missoula weather the
overnight low has been 70 or higher.

&&

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

Nester

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In the hours before

Local storm report, Jul 17, 4:48 PM MDT, 51 minutes before

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Local storm report, Jul 17, 5:08 PM MDT, 31 minutes before

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Local storm report, Jul 17, 5:19 PM MDT, 20 minutes before

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Special weather statement, Jul 17, 5:20 PM MDT, 19 minutes before

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Local storm report, Jul 17, 5:35 PM MDT, 4 minutes before

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Special weather statement, Jul 17, 5:39 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 17, 2:21 PM MDT	Special Weather Statement	MSO	Lincoln	39 min
Jul 17, 2:36 PM MDT	Special Weather Statement	MSO	Missoula	24 min
Jul 17, 2:42 PM MDT	Special Weather Statement	MSO	Flathead	33 min
Jul 17, 2:49 PM MDT	Special Weather Statement	MSO		41 min
Jul 17, 2:53 PM MDT	Special Weather Statement	MSO	Powell	52 min
Jul 17, 2:56 PM MDT	Severe Thunderstorm Warning	MSO	Flathead	49 min
Jul 17, 3:02 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	43 min
Jul 17, 3:06 PM MDT	Special Weather Statement	MSO	Lake	24 min
Jul 17, 3:08 PM MDT	Severe Thunderstorm Warning	MSO	Lincoln	37 min
Jul 17, 3:26 PM MDT	Severe Thunderstorm Warning	MSO	Flathead, Lake	49 min
Jul 17, 3:28 PM MDT	Special Weather Statement	MSO		32 min
Jul 17, 3:32 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Powell	43 min
Jul 17, 3:42 PM MDT	Severe Thunderstorm Warning	MSO	Missoula, Powell	63 min
Jul 17, 3:43 PM MDT	Severe Thunderstorm Warning	MSO	Flathead	47 min
Jul 17, 4:00 PM MDT	Severe Thunderstorm Warning	MSO	Flathead	30 min
Jul 17, 4:12 PM MDT	Severe Thunderstorm Warning	MSO	Powell	33 min
Jul 17, 5:20 PM MDT	Special Weather Statement	MSO	Deer Lodge	40 min
Jul 16, 6:30 PM MDT	Special Weather Statement	MSO	Clearwater	45 min
Jul 17, 2:31 PM MDT	Special Weather Statement	MSO	Lemhi	29 min
Jul 17, 3:17 PM MDT	Areal Flood Advisory	MSO	Lemhi	58 min

Nearby

Special Weather Statements in Montana, 2013 Every special weather statement in 2013

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.