Alert archive / Montana / Special Weather Statements in 2018

Special Weather Statement, NWS Great Falls, MT

July 19, 2018Hill County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 19, 2018, 10:22 PM MDT for Hill County, Montana. It was in force for 23 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 19, 2018, 10:22 PM MDT (04:22 UTC)
Expired: Jul 19, 2018, 10:45 PM MDT
In force: 23 min
Issued by: NWS Great Falls, MT

County Hill County, MT

The radar

The Great Falls radar (KTFX), 131 km from the middle of the area, began a volume at 04:23 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 00:00Z, 4.4 hours before the alert went out and 100 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: 32 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 3325 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 40 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 Jul 19, 9:22 PM MDT, 1 hour earlier.

Area forecast discussion, Jul 19, 9:22 PM MDT, 1 hour before

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In the hours before

Special weather statement, Jul 19, 7:41 PM MDT, 2 hours 41 minutes before

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Special weather statement, Jul 19, 8:01 PM MDT, 2 hours 21 minutes before

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Special weather statement, Jul 19, 8:26 PM MDT, 1 hour 56 minutes before

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Special weather statement, Jul 19, 9:09 PM MDT, 1 hour 13 minutes before

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Special weather statement, Jul 19, 10:22 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
Jul 19, 7:41 PM MDT	Special Weather Statement	TFX	Toole	34 min
Jul 19, 8:01 PM MDT	Special Weather Statement	TFX	Liberty	59 min
Jul 19, 8:26 PM MDT	Special Weather Statement	TFX	Liberty	49 min
Jul 19, 9:09 PM MDT	Special Weather Statement	TFX	Liberty	51 min
Jul 19, 11:16 PM MDT	Special Weather Statement	TFX	Blaine	44 min
Jul 20, 12:01 AM MDT	Special Weather Statement	TFX	Blaine	59 min
Jul 20, 3:40 AM MDT	Red Flag Warning	TFX	Broadwater, Cascade, Fergus, Gallatin, Glacier, Jefferson and 7 more	19 hr
Jul 20, 2:00 PM MDT	Red Flag Warning	TFX	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 12 more	34 hr

Nearby

Special Weather Statements in Montana, 2018 Every special weather statement in 2018

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.