Alert archive / Montana / Special Weather Statements in 2019

Special Weather Statement, NWS Great Falls, MT

July 12, 2019Madison County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 12, 2019, 4:21 PM MDT for Madison County, Montana. It was in force for 39 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 12, 2019, 4:21 PM MDT (22:21 UTC)
Expired: Jul 12, 2019, 5:00 PM MDT
In force: 39 min
Issued by: NWS Great Falls, MT

County Madison County, MT

The radar

The Great Falls radar (KTFX), 245 km from the middle of the area, began a volume at 22:21 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

Riverton, WY (KRIW), launched 12:00Z, 10.4 hours before the alert went out and 371 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: 37 J/kg
Mixed-layer CIN: -306 J/kg
Mixed-layer LCL: 2577 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 75 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 6:32 PM MDT	Special Weather Statement	TFX		28 min
Jul 11, 7:04 PM MDT	Special Weather Statement	TFX	Broadwater	41 min
Jul 11, 7:25 PM MDT	Special Weather Statement	TFX		35 min
Jul 11, 7:33 PM MDT	Special Weather Statement	TFX	Fergus	42 min
Jul 11, 7:39 PM MDT	Special Weather Statement	TFX	Broadwater	36 min
Jul 11, 7:51 PM MDT	Special Weather Statement	TFX	Meagher	39 min
Jul 11, 8:02 PM MDT	Special Weather Statement	TFX	Broadwater	28 min
Jul 11, 8:29 PM MDT	Special Weather Statement	TFX	Meagher	46 min
Jul 11, 8:53 PM MDT	Severe Thunderstorm Warning	TFX	Judith Basin, Meagher	37 min
Jul 11, 9:05 PM MDT	Special Weather Statement	TFX	Fergus	25 min
Jul 11, 9:30 PM MDT	Special Weather Statement	TFX	Judith Basin	30 min
Jul 11, 9:36 PM MDT	Special Weather Statement	TFX	Fergus	39 min
Jul 11, 9:58 PM MDT	Special Weather Statement	TFX	Fergus	47 min
Jul 11, 10:29 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	31 min
Jul 12, 3:01 PM MDT	Special Weather Statement	TFX	Madison	14 min
Jul 12, 4:35 PM MDT	Severe Thunderstorm Warning	TFX	Madison	40 min
Jul 12, 5:21 PM MDT	Special Weather Statement	TFX	Madison	9 min
Jul 12, 5:23 PM MDT	Special Weather Statement	TFX	Gallatin	22 min
Jul 12, 5:45 PM MDT	Special Weather Statement	TFX	Gallatin	30 min
Jul 12, 5:58 PM MDT	Special Weather Statement	TFX		17 min

Nearby

Special Weather Statements in Montana, 2019 Every special weather statement in 2019

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.