Severe Thunderstorm Warning 121, NWS Great Falls, MT

Area Forecast Discussion
National Weather Service Great Falls MT
157 PM MDT Wed Jul 13 2022

.SYNOPSIS...

Showers and thunderstorms will move through portions of the area
this afternoon and evening, before moving off to the east
overnight tonight. In the wake of these showers and storms,
temperatures tomorrow will be a few degrees cooler than what is
seen today.

&&

.DISCUSSION...

Thursday... Showers and thunderstorms have begun to develop across
Southwestern Montana in a warm unstable air mass. Biggest question
at the moment is how much the late morning/early afternoon cloud
cover will inhibit development over portions of North-Central MT,
particularly around the Great Falls area, but given that
thunderstorms have already begun to develop as of 2 PM MDT,
thunderstorm initiation should not be much of an issue. However,
the cloud cover has inhibited some of the DCAPE (potential for
downdrafts and subsequent outflows), but this DCAPE remains
sufficient for some gusty thunderstorm outflow winds, especially
east of Great Falls. Storms this afternoon will move to the
northeast, and should remain south and east of a line from Great
Falls to Havre once they reach the plains. Ludwig

Friday through Sunday.... For Friday/Saturday, the thunderstorm
development is expected to be isolated. The main threat from any
storms will be gusty winds and lightning. Afternoon temperatures
will continue to average 5 to 10 degrees above normal. By Sunday,
this will be several days with previous afternoon highs of 90
degrees and higher. With some areas approaching high temperatures
above 95 to near 100 degrees on Saturday and Sunday, a Heat Advisory
may be needed for portions of North Central MT for both days with a
higher consideration of an advisory for Sunday.

Monday through Wednesday...A quick moving upper level disturbance
moves eastward across the Hi-line area on Monday, this could result
in a few isolated thunderstorms. Otherwise, an upper level ridge
returns by Tuesday with drier conditions and near normal average
temperatures for Tuesday and Wednesday.

&&

.AVIATION...
1230 AM MDT Wed Jul 13 2022 (13/18Z TAF period)

While VFR conditions should continue through the majority of the
forecast period, gusty showers and thunderstorms are expected to
develop across SW MT this afternoon and move northeastward, and
should primarily remain near and south and east of a Great Falls to
Havre line. Remain alert for strong, gusty outflow winds and strong
downdrafts from any shower or storm today. Ludwig

Refer to weather.gov/zlc for more detailed regional aviation
weather and hazard information.

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  57  93  57  94 /  30   0  10  20
CTB  53  87  55  90 /   0   0   0  10
HLN  61  93  61  93 /  30  10  10  30
BZN  55  92  56  91 /  30  30  20  40
WYS  46  84  47  83 /  70  40  20  40
DLN  53  88  54  86 /  20  30  20  30
HVR  62  90  63  96 /  30   0  10  20
LWT  57  88  59  91 /  60  10  20  30

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
None.
&&

http://www.weather.gov/greatfalls

Special Weather Statement
National Weather Service Great Falls MT
1247 PM MDT Wed Jul 13 2022

MTZ014-052-053-131930-
Broadwater MT-Jefferson MT-Central and Southern Lewis and Clark MT-
1247 PM MDT Wed Jul 13 2022

...Thunderstorms Developing near and west of the Continental Divide
will impact portions of southern Lewis and Clark, northwestern
Broadwater and northern Jefferson Counties through 130 PM MDT...

At 1244 PM MDT, Doppler radar was tracking developing thunderstorms
along a line extending from 13 miles southwest of Wolf Creek to 18
miles north of Basin to 10 miles east of Galen. Movement was
northeast at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Occasional lightning and brief rainfall
         are also possible.

Strong thunderstorms will be near...
  Basin around 105 PM MDT.
  Wolf Creek around 110 PM MDT.
  Helena around 120 PM MDT.

Other locations impacted by these storms include Wickes, York,
Rimini, Alhambra, Corbin, Spring Meadow Lake State Park, Austin,
Elkhorn State Park, Marysville and Winston.

This includes the following highways...
 Interstate 15 between mile markers 138 and 241.
 Highway 200 between mile markers 67 and 95.
 Highway 12 between mile markers 1  and 4 , and between mile markers
29 and 80.
 Highway 287 between mile markers 1  and 15.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms 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 4725 11206 4714 11194 4712 11179 4692 11179
      4691 11164 4680 11153 4681 11153 4682 11152
      4653 11132 4631 11144 4612 11178 4609 11247
      4623 11260 4633 11254 4641 11232 4662 11230
      4670 11253 4683 11253 4684 11271 4696 11278
TIME...MOT...LOC 1844Z 226DEG 29KT 4684 11223 4651 11241 4623 11256

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

BH

Special Weather Statement
National Weather Service Great Falls MT
1258 PM MDT Wed Jul 13 2022

MTZ055-131915-
Gallatin MT-
1258 PM MDT Wed Jul 13 2022

...A strong thunderstorm will impact portions of east central
Gallatin County through 115 PM MDT...

At 1257 PM MDT, Doppler radar was tracking a strong thunderstorm 22
miles south of Bozeman, moving northeast at 30 mph.

HAZARD...Winds in excess of 30 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of east central
Gallatin County.

This includes Highway 191 between mile markers 55 and 60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4540 11123 4565 11080 4560 11080 4559 11083
      4559 11086 4553 11086 4552 11092 4536 11092
      4535 11104 4525 11104 4524 11109
TIME...MOT...LOC 1857Z 239DEG 25KT 4536 11107

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

Brusda

Special Weather Statement
National Weather Service Great Falls MT
142 PM MDT Wed Jul 13 2022

MTZ014-054-132030-
Central and Southern Lewis and Clark MT-Meagher MT-
142 PM MDT Wed Jul 13 2022

...A strong thunderstorm will impact portions of southeastern Lewis
and Clark, northern Broadwater, northwestern Meagher and southwestern
Cascade Counties through 230 PM MDT...

At 141 PM MDT, Doppler radar was tracking a strong thunderstorm near
East Helena, or 11 miles east of Helena, moving northeast at 25 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
York, Fort Logan On The Smith River and Black Sandy State Park.

This includes Highway 12 between mile markers 52 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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.

If on or near Hauser Lake, the north end of Canyon Ferry Reservoir
or Lake Helena, get out of the water and move indoors or inside a
vehicle. Remember, lightning can strike out to 10 miles from the
parent thunderstorm. If you can hear thunder, you are close enough
to be struck by lightning. Move to safe shelter now! Do not be
caught on the water in a thunderstorm.

&&

LAT...LON 4692 11178 4691 11155 4701 11153 4701 11121
      4674 11108 4664 11140 4668 11145 4675 11146
      4678 11160 4674 11164 4657 11164 4657 11187
      4676 11199
TIME...MOT...LOC 1941Z 240DEG 22KT 4662 11179

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

BH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
144 PM MDT WED JUL 13 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0139 PM     HAIL             2 ESE CORBIN            46.37N 112.02W
07/13/2022  E0.50 INCH       JEFFERSON          MT   TRAINED SPOTTER

            TRAINED SPOTTER ESTIMATES HAIL UP TO A HALF
            INCH IN DIAMETER.

&&

AM

Special Weather Statement
National Weather Service Great Falls MT
154 PM MDT Wed Jul 13 2022

MTZ008-015-132045-
Madison MT-Beaverhead MT-
154 PM MDT Wed Jul 13 2022

...A strong thunderstorm will impact portions of west central Madison
and central Beaverhead Counties through 245 PM MDT...

At 153 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Dillon, moving northeast at 35 mph.

HAZARD...Wind gusts of 50 to 55 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Dillon, Alder, Beaverhead Rock State Park, Melrose, Bannack, Laurin,
Clark Canyon, Bannack State Park and Glen.

This includes Interstate 15 between mile markers 42  and 93 .

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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 4523 11308 4565 11271 4529 11199 4495 11288
TIME...MOT...LOC 1953Z 240DEG 32KT 4514 11279

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

BH

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>