Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Glasgow, MT

July 9, 2021McCone County, Montana

NWS Glasgow, MT issued this special weather statement at Jul 9, 2021, 6:16 PM MDT for McCone County, Montana. It was in force for 44 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 9, 2021, 6:16 PM MDT (00:16 UTC)
Expired: Jul 9, 2021, 7:00 PM MDT
In force: 44 min
Issued by: NWS Glasgow, MT

County McCone County, MT

The radar

The Glasgow radar (KGGW), 77 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 75 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: 557 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 2525 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 8 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 Glasgow, MT wrote its last area forecast discussion before this special weather statement went out at Jul 9, 2:10 PM MDT, 4 hours 6 minutes earlier.

Area forecast discussion, Jul 9, 2:10 PM MDT, 4 hours 6 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
210 PM MDT Fri Jul 9 2021

.DISCUSSION...
An upper low over central Montana is helping to develop cumulus
clouds across the CWA this afternoon. Most of these will be garden
variety (not severe) but some could bring brief gusts to 40 mph or
so through the early evening. Look for them to diminish later
this evening as the upper low drifts to our southeast.

Saturday, the absence of the upper low will allow the upper high
over the Desert SW to build across Montana. This will allow temps
to warm into the 80s and 90s. This warming trend will continue
into Sunday with highs in the 90s to around 100. With near
critical excessive heat expected, an Excessive Heat Watch was
issued. Heat Advisories and/or Warnings look likely according to
the WR NWS HeatRisk map/guidance for Sunday.

The upper ridge begins to break down Sunday allowing for slight
chances of thunderstorms late in the day.

Another upper low moves in about Tuesday allowing for another
slight chance of thunderstorms, but it mainly looks to affect
southern Montana at this point.

Temps Monday through Wednesday look to lower closer to climate
normals but then should jump back up later in the week as the
disturbance moves out and the Desert SW upper ridge rebounds. TFJ

&&

.AVIATION...
Flight Category: VFR

Synopsis: Scattered thunderstorms this afternoon and evening may
be associated with reduced ceilings and visibilities if one should
track over a taf site.

Winds: North through this afternoon at 10 to 15 kts. Gusty and
shifting winds are possible near any storms. Winds will become
light and variable late tonight. TFJ

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Watch from Sunday afternoon through Sunday
evening for Central and Southeast Phillips...Central and
Southern Valley...Garfield...Petroleum...Southwest Phillips.

&&

weather.gov/glasgow

In the hours before

Special weather statement, Jul 9, 3:52 PM MDT, 2 hours 24 minutes before

Special Weather Statement
National Weather Service Glasgow MT
352 PM MDT Fri Jul 9 2021

MTZ018-061-092230-
Northern Valley MT-Daniels MT-
352 PM MDT Fri Jul 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DANIELS AND
NORTHEASTERN VALLEY COUNTIES UNTIL 430 PM MDT...

At 351 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles north of Peerless to 7 miles west of
Richland to 11 miles southwest of Opheim. Movement was south at 20
mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Opheim, Richland, Peerless, West Fork, Baylor and Glentana.

LAT...LON 4876 10557 4860 10609 4858 10677 4894 10671
      4900 10635 4900 10579
TIME...MOT...LOC 2151Z 338DEG 16KT 4889 10587 4879 10622 4879 10663

NWS Glasgow

Special weather statement, Jul 9, 4:28 PM MDT, 1 hour 48 minutes before

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Special weather statement, Jul 9, 4:57 PM MDT, 1 hour 19 minutes before

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Special weather statement, Jul 9, 6:05 PM MDT, 11 minutes before

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Special weather statement, Jul 9, 6:16 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:05 PM MDT	Special Weather Statement	GGW	Valley	40 min
Jul 9, 6:46 PM MDT	Special Weather Statement	GGW	Valley	59 min
Jul 9, 7:27 PM MDT	Special Weather Statement	GGW		63 min

Nearby

Special Weather Statements in Montana, 2021 Every special weather statement in 2021

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.