Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Glasgow, MT

July 22, 2021Wibaux County, Montana

NWS Glasgow, MT issued this special weather statement at Jul 22, 2021, 1:13 PM MDT for Wibaux County, Montana. It was in force for 62 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 22, 2021, 1:13 PM MDT (19:13 UTC)
Expired: Jul 22, 2021, 2:15 PM MDT
In force: 62 min
Issued by: NWS Glasgow, MT

County Wibaux County, MT

The radar

The Glasgow radar (KGGW), 218 km from the middle of the area, began a volume at 19:16 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 12:00Z, 7.2 hours before the alert went out and 218 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: 310 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 1986 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 22, 3:15 AM MDT, 9 hours 58 minutes earlier.

Area forecast discussion, Jul 22, 3:15 AM MDT, 9 hours 58 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
315 AM MDT Thu Jul 22 2021

.DISCUSSION...

...Isolated severe threat today and high fire danger on Friday for
NE Montana...

There are several short term forecast challenges up for
consideration. First, radar and observations show isolated
thunderstorms across portions of NE Montana early this morning,
some putting down wetting rains. Expect coverage to grow into the
afternoon and tonight as a shortwave and surface cold front
approaches when a couple storms may be severe. Main concerns
continue to surround downdraft wind gusts as well as wildfire risk
from these winds and peripheral lightning in the presence of dry
fuels.

Additionally, with temperatures will into the 90s if not low 100s
for much of NE Montana, Excessive Heat Warning will remain in
effect. Look for a break from the excessive heat on Friday
although temperatures will still be above normal. Main concern
here is breezy westerly flow in the presence of very dry fuels and
relative humidity dropping to around 10 percent for western and
central portions of the CWA. Further east, humidity will still
likely be below 20 percent. Thus, confidence is growing on a high
fire danger day here and the Fire Weather Watch remains in effect.
Secondarily, winds may be strong enough for a few hours to come
close to Lake Wind Advisory criteria in the afternoon or evening.

Longer term ensembles point to the upper ridge pattern becoming
established once more over the western U.S. for the upcoming
weekend and early next week, which would bring about a return to
excessive heat concerns.

&&

.AVIATION...
VFR conditions will prevail though haze may temporarily lead to a
reduction in visibility. In addition, scattered thunderstorms
today and tonight may result in MVFR to IFR ceilings and
visibilities at times as well as gusty and shifting winds. A few
storms may also be severe this afternoon and evening.

&&

.FIRE WEATHER...
Look for relative humidity as low as 9 percent on Friday afternoon
with west to northwest winds at 10 to 20 kts with occasional
higher gusts in the presence of dry fuels. These conditions will
lead to high fire danger and a Fire Weather Watch remains in
effect for Fire Weather Zones 120, 122, and 134-137 from Noon
until 9 PM.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Warning until 9 PM MDT this evening for Central
and Southeast Phillips...Central and Southern Valley...Dawson...
Eastern Roosevelt...Garfield...McCone...Petroleum...Prairie...
Richland...Southwest Phillips...Western Roosevelt...Wibaux.

Fire Weather Watch from Friday afternoon through Friday evening
for MTZ120-122-134>137.

&&

weather.gov/glasgow

In the hours before

Special weather statement, Jul 22, 12:16 PM MDT, 57 minutes before

Special Weather Statement
National Weather Service Glasgow MT
1216 PM MDT Thu Jul 22 2021

MTZ023-025-026-221915-
Dawson MT-Prairie MT-McCone MT-
1216 PM MDT Thu Jul 22 2021

...SPECIAL WEATHER STATEMENT...

At 1215 PM MDT, Doppler radar was tracking a strong thunderstorm 20
miles northwest of Terry, moving northeast at 40 mph.

Small hail and winds in excess of 30 mph will be possible with this
storm.

Locations impacted include...
Lindsay and West Glendive.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4693 10564 4701 10570 4747 10512 4714 10468
      4692 10536
TIME...MOT...LOC 1815Z 241DEG 34KT 4700 10563

NWS Glasgow

Special weather statement, Jul 22, 1:13 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Glasgow MT
113 PM MDT Thu Jul 22 2021

MTZ025>027-222015-
Dawson MT-Prairie MT-Wibaux MT-
113 PM MDT Thu Jul 22 2021

...SPECIAL WEATHER STATEMENT...

At 113 PM MDT, Doppler radar was tracking a strong thunderstorm near
Fallon, or 12 miles east of Terry, moving northeast at 40 mph.

Small hail and winds in excess of 30 mph will be possible with this
storm.

Locations impacted include...
Fallon, Hoyt, Hodges, Mildred and Marsh.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4657 10525 4683 10519 4720 10429 4681 10423
      4668 10444 4669 10461 4666 10461 4666 10473
      4661 10474 4661 10486 4657 10486 4657 10498
      4654 10499 4654 10524
TIME...MOT...LOC 1913Z 241DEG 33KT 4678 10505

NWS Glasgow

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:08 PM MDT	Special Weather Statement	GGW	Petroleum	37 min
Jul 21, 8:51 PM MDT	Special Weather Statement	GGW	Phillips	54 min
Jul 22, 12:16 PM MDT	Special Weather Statement	GGW	Dawson	59 min
Jul 22, 2:16 PM MDT	Red Flag Warning	GGW	Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more	31 hr
Jul 22, 2:17 PM MDT	Special Weather Statement	GGW	Wibaux	28 min
Jul 22, 2:48 PM MDT	Special Weather Statement	GGW	Wibaux	57 min
Jul 22, 4:08 PM MDT	Special Weather Statement	GGW	Petroleum	52 min
Jul 22, 4:58 PM MDT	Special Weather Statement	GGW	Garfield, Petroleum	47 min
Jul 22, 5:17 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips, Valley	28 min
Jul 22, 5:41 PM MDT	Special Weather Statement	GGW	Valley	64 min
Jul 22, 5:51 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Phillips, Valley	54 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.