Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Great Falls, MT

July 11, 2017

NWS Great Falls, MT issued this special weather statement at Jul 11, 2017, 5:13 PM MDT. It was in force for 32 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 11, 2017, 5:13 PM MDT (23:13 UTC)
Expired: Jul 11, 2017, 5:45 PM MDT
In force: 32 min
Issued by: NWS Great Falls, MT

The radar

The Glasgow radar (KGGW), 172 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 137 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: 1086 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -64 m²/s²
0-3 km storm-relative helicity: 13 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 11, 5:10 PM MDT, 3 minutes earlier.

Area forecast discussion, Jul 11, 5:10 PM MDT, 3 minutes before

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In the hours before

Special weather statement, Jul 11, 2:21 PM MDT, 2 hours 52 minutes before

Special Weather Statement
National Weather Service Great Falls MT
221 PM MDT TUE JUL 11 2017

MTZ011-047-112100-
Hill MT-Blaine MT-
221 PM MDT TUE JUL 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL BLAINE AND EAST
CENTRAL HILL COUNTIES UNTIL 300 PM MDT...

At 219 PM MDT, Doppler radar was tracking a strong thunderstorm near
Havre, moving southeast at 20 mph.

Dime size hail and winds in excess of 30 mph will be possible with
this storm. This storm will impact mainly rural areas south of
Highway 2.

Locations impacted include...
Havre.

LAT...LON 4848 10982 4858 10972 4845 10930 4829 10943
TIME...MOT...LOC 2019Z 298DEG 19KT 4850 10970

KLG

Special weather statement, Jul 11, 2:50 PM MDT, 2 hours 23 minutes before

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Local storm report, Jul 11, 2:58 PM MDT, 2 hours 15 minutes before

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Local storm report, Jul 11, 3:03 PM MDT, 2 hours 10 minutes before

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Local storm report, Jul 11, 3:19 PM MDT, 1 hour 54 minutes before

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Special weather statement, Jul 11, 5:13 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 10, 6:13 PM MDT	Special Weather Statement	TFX	Gallatin	32 min
Jul 10, 6:44 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark	31 min
Jul 10, 7:05 PM MDT	Special Weather Statement	TFX	Lewis and Clark	40 min
Jul 10, 7:11 PM MDT	Special Weather Statement	TFX	Gallatin	34 min
Jul 10, 7:24 PM MDT	Special Weather Statement	TFX	Silver Bow	36 min
Jul 10, 7:52 PM MDT	Special Weather Statement	TFX	Lewis and Clark	38 min
Jul 10, 8:01 PM MDT	Special Weather Statement	TFX	Jefferson	44 min
Jul 10, 8:23 PM MDT	Special Weather Statement	TFX	Chouteau	52 min
Jul 10, 9:09 PM MDT	Special Weather Statement	TFX	Toole	51 min
Jul 10, 9:34 PM MDT	Special Weather Statement	TFX	Glacier	41 min
Jul 10, 10:52 PM MDT	Special Weather Statement	TFX	Toole	38 min
Jul 10, 11:23 PM MDT	Special Weather Statement	TFX	Toole	67 min
Jul 10, 11:55 PM MDT	Special Weather Statement	TFX	Hill	50 min
Jul 11, 12:13 AM MDT	Severe Thunderstorm Warning	TFX	Blaine, Hill	47 min
Jul 11, 1:00 AM MDT	Severe Thunderstorm Warning	TFX	Blaine	45 min
Jul 11, 2:21 PM MDT	Special Weather Statement	TFX	Blaine	39 min
Jul 11, 2:50 PM MDT	Special Weather Statement	TFX	Blaine	40 min
Jul 11, 5:15 PM MDT	Special Weather Statement	TFX	Blaine	30 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.