Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Great Falls, MT

August 9, 2017Jefferson County, Montana

NWS Great Falls, MT issued this special weather statement at Aug 9, 2017, 5:57 PM MDT for Jefferson County, Montana. It was in force for 33 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 9, 2017, 5:57 PM MDT (23:57 UTC)
Expired: Aug 9, 2017, 6:30 PM MDT
In force: 33 min
Issued by: NWS Great Falls, MT

County Jefferson County, MT

The radar

The Missoula radar (KMSX), 147 km from the middle of the area, began a volume at 23:57 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, 12.0 hours before the alert went out and 193 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: 1557 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -7 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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Aug 9, 5:26 PM MDT, 31 minutes earlier.

Area forecast discussion, Aug 9, 5:26 PM MDT, 31 minutes before

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In the hours before

Special weather statement, Aug 9, 5:13 PM MDT, 44 minutes before

Special Weather Statement
National Weather Service Great Falls MT
513 PM MDT WED AUG 9 2017

MTZ053-054-092345-
Broadwater-Meagher-
513 PM MDT WED AUG 9 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN
BROADWATER AND SOUTHWESTERN MEAGHER COUNTIES THROUGH 545 PM MDT...

At 511 PM MDT, radar indicated strong thunderstorms were located
along a line extending from 16 miles northeast of East Helena to 20
miles east of Toston, or over the Big Belt Mountains. These storms
were nearly stationary.

Winds in excess of 30 mph and brief heavy rain are possible with
these storms.

Locations impacted include...
Goose Bay.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4679 11159 4682 11162 4686 11161 4681 11154
      4681 11158 4680 11159 4677 11156 4677 11149
      4632 11090 4619 11104 4619 11112 4660 11165
      4674 11164
TIME...MOT...LOC 2311Z 344DEG 7KT 4673 11165 4619 11100

Coulston

Special weather statement, Aug 9, 5:19 PM MDT, 38 minutes before

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Special weather statement, Aug 9, 5:44 PM MDT, 13 minutes before

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Special weather statement, Aug 9, 5:48 PM MDT, 9 minutes before

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Special weather statement, Aug 9, 5:53 PM MDT, 4 minutes before

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Special weather statement, Aug 9, 5:57 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:16 PM MDT	Special Weather Statement	TFX	Jefferson	29 min
Aug 9, 3:40 PM MDT	Special Weather Statement	TFX	Lewis and Clark	50 min
Aug 9, 4:04 PM MDT	Special Weather Statement	TFX	Jefferson	26 min
Aug 9, 4:17 PM MDT	Special Weather Statement	TFX	Meagher	28 min
Aug 9, 4:22 PM MDT	Special Weather Statement	TFX	Madison	23 min
Aug 9, 4:35 PM MDT	Special Weather Statement	TFX	Jefferson	25 min
Aug 9, 5:06 PM MDT	Special Weather Statement	TFX	Jefferson	24 min
Aug 9, 5:08 PM MDT	Special Weather Statement	TFX	Beaverhead	37 min
Aug 9, 5:13 PM MDT	Special Weather Statement	TFX	Broadwater	32 min
Aug 9, 5:19 PM MDT	Special Weather Statement	TFX	Jefferson	26 min
Aug 9, 5:44 PM MDT	Special Weather Statement	TFX	Broadwater	31 min
Aug 9, 5:48 PM MDT	Special Weather Statement	TFX	Broadwater	27 min
Aug 9, 5:53 PM MDT	Special Weather Statement	TFX	Beaverhead	37 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.