Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Missoula, MT

July 10, 2017Deer Lodge County, Montana

NWS Missoula, MT issued this special weather statement at Jul 10, 2017, 3:40 PM MDT for Deer Lodge County, Montana. It was in force for 35 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 10, 2017, 3:40 PM MDT (21:40 UTC)
Expired: Jul 10, 2017, 4:15 PM MDT
In force: 35 min
Issued by: NWS Missoula, MT

County Deer Lodge County, MT

The radar

The Missoula radar (KMSX), 112 km from the middle of the area, began a volume at 21:41 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, 9.7 hours before the alert went out and 247 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: 101 J/kg
Mixed-layer CIN: -310 J/kg
Mixed-layer LCL: 2781 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 106 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 10, 2:08 PM MDT, 1 hour 32 minutes earlier.

Area forecast discussion, Jul 10, 2:08 PM MDT, 1 hour 32 minutes before

Area Forecast Discussion
National Weather Service Missoula MT
208 PM MDT Mon Jul 10 2017

.DISCUSSION...An approaching disturbance is causing the strong
ridge of high pressure to finally break down. This feature is also
the kicker for convection across Lemhi county into southwest
Montana. The combination of significant instability and more wind
shear will contribute to stronger storms across the
aforementioned region. These storms will be capable of hail, gusty
winds and brief heavy rain.

A few showers will linger throughout the night along the
Continental Divide. Westerly flow will persist over the northern
Rockies through Tuesday keeping the temperatures cooler to near
normal readings.

The heatwave returns by Wednesday, and will last through the
weekend and into early next week. In fact, each day will warm by
5 to 7 degrees or so, with Friday, Saturday, and Sunday topping
out as the hottest days during this particular stretch.
Temperatures will have the potential to reach 100 degrees in valleys
across western Montana and central Idaho on Friday, with an even
greater chance of hitting 100 degrees, or slightly higher
(102-105F), both Saturday and Sunday.

With such strong high pressure locked in place across the western
half of the United States, our forecast models show no
foreseeable break in this hot and dry pattern through at least
July 20th.

&&

.AVIATION...
Scattered to numerous showers and thunderstorms will continue to
develop across Lemhi county into southwest Montana. A few of these
storms could become fairly strong, producing gusty winds, hail and
brief heavy rain. KSMN and KBTM have the best chance of being
impacted by these storms through 11/03z. A few showers will be
traversing northwest Montana this afternoon and evening, but
having a minimal impact to KGPI. A few showers could linger along
the Continental Divide throughout the night.

&&

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

In the hours before

Special weather statement, Jul 10, 1:29 PM MDT, 2 hours 11 minutes before

Special Weather Statement
National Weather Service Missoula MT
129 PM MDT MON JUL 10 2017

MTZ007-102015-
Butte/Blackfoot Region MT-
129 PM MDT MON JUL 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SILVER BOW COUNTY UNTIL
215 PM MDT...

At 129 PM MDT, Doppler radar was tracking a strong thunderstorm near
Divide, or 15 miles south of Butte, moving northeast at 40 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Butte and Walkerville around 155 PM MDT.

Other locations impacted by this storm include Janney and Newcomb.

LAT...LON 4575 11248 4576 11250 4575 11252 4572 11252
      4567 11259 4578 11280 4612 11251 4610 11247
      4605 11248 4602 11244 4593 11244 4589 11240
      4585 11243 4583 11239
TIME...MOT...LOC 1929Z 216DEG 33KT 4579 11263

Local storm report, Jul 10, 2:43 PM MDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
243 PM MDT MON JUL 10 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     HAIL             16 SE JANNEY            45.76N 112.23W
07/10/2017  E1.00 INCH       SILVER BOW         MT   PUBLIC

&&

TS

Special weather statement, Jul 10, 3:40 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Missoula MT
340 PM MDT MON JUL 10 2017

MTZ007-102215-
Butte/Blackfoot Region MT-
340 PM MDT MON JUL 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL DEER LODGE...
SOUTHEASTERN GRANITE AND SOUTH CENTRAL POWELL COUNTIES UNTIL 415 PM
MDT...

At 339 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles south of Philipsburg, or 18 miles west of Anaconda, moving
northeast at 40 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Anaconda, West Valley, Galen, Porters Corner, Lost Creek and
Georgetown.

LAT...LON 4602 11337 4611 11344 4618 11344 4621 11343
      4644 11294 4621 11275
TIME...MOT...LOC 2139Z 240DEG 36KT 4614 11334

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 9, 10:17 PM MDT	Special Weather Statement	MSO	Ravalli	43 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, 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.