Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Great Falls, MT

August 11, 2017Judith Basin County, Montana

NWS Great Falls, MT issued this special weather statement at Aug 11, 2017, 7:39 PM MDT for Judith Basin County, Montana. It was in force for 36 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 11, 2017, 7:39 PM MDT (01:39 UTC)
Expired: Aug 11, 2017, 8:15 PM MDT
In force: 36 min
Issued by: NWS Great Falls, MT

County Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 71 km from the middle of the area, began a volume at 01:41 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.7 hours before the alert went out and 325 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: 2254 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 323 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 11, 6:00 PM MDT, 1 hour 39 minutes earlier.

Area forecast discussion, Aug 11, 6:00 PM MDT, 1 hour 39 minutes before

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In the hours before

Special weather statement, Aug 11, 6:11 PM MDT, 1 hour 28 minutes before

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Special weather statement, Aug 11, 7:12 PM MDT, 27 minutes before

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Special weather statement, Aug 11, 7:14 PM MDT, 25 minutes before

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Special weather statement, Aug 11, 7:39 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 11, 6:11 PM MDT	Special Weather Statement	TFX	Judith Basin	49 min
Aug 11, 7:12 PM MDT	Special Weather Statement	TFX	Wheatland	18 min
Aug 11, 7:14 PM MDT	Special Weather Statement	TFX	Lewis and Clark	16 min
Aug 11, 8:23 PM MDT	Special Weather Statement	TFX	Judith Basin	37 min
Aug 11, 8:37 PM MDT	Special Weather Statement	TFX	Hill	23 min
Aug 11, 9:11 PM MDT	Special Weather Statement	TFX	Fergus	34 min
Aug 11, 9:14 PM MDT	Special Weather Statement	TFX	Gallatin	31 min
Aug 11, 9:16 PM MDT	Special Weather Statement	TFX	Hill	29 min
Aug 11, 9:46 PM MDT	Special Weather Statement	TFX	Hill	29 min
Aug 12, 2:47 PM MDT	Fire Weather Watch	TFX	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 12 more	13 hr

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.