Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 68, NWS Great Falls, MT

July 24, 2013Glacier County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 24, 2013, 6:09 PM MDT for Glacier County, Montana. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 24, 2013, 6:09 PM MDT (00:09 UTC)
Expired: Jul 24, 2013, 7:00 PM MDT
In force: 51 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

County Glacier County, MT

The radar

The Great Falls radar (KTFX), 183 km from the middle of the area, began a volume at 00:11 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 24, 5:26 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.2 hours before the alert went out and 225 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: 57 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 3725 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 24, 2:37 PM MDT, 3 hours 32 minutes earlier.

Area forecast discussion, Jul 24, 2:37 PM MDT, 3 hours 32 minutes before

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Hazardous weather outlook, Jul 24, 4:52 AM MDT, 13 hours 17 minutes before

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In the hours before

Special weather statement, Jul 24, 4:23 PM MDT, 1 hour 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
423 PM MDT WED JUL 24 2013

MTZ009-010-242300-
EASTERN GLACIER MT-NORTHERN ROCKY MOUNTAIN FRONT MT-
423 PM MDT WED JUL 24 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GLACIER COUNTY UNTIL 500
PM MDT...

AT 419 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 35 MILES NORTH OF KIOWA...OR 61 MILES NORTHWEST
OF CUT BANK...MOVING EAST AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH BRIEF HEAVY RAIN AND
CLOUD-TO-GROUND LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE PORT OF PIEGAN AND
RURAL AREAS OF NORTHERN GLACIER COUNTY.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4901 11356 4901 11307 4901 11295 4880 11296
      4892 11375 4900 11373 4901 11357
TIME...MOT...LOC 2221Z 278DEG 20KT 4900 11353

MLV

Special weather statement, Jul 24, 4:49 PM MDT, 1 hour 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
449 PM MDT WED JUL 24 2013

MTZ009-010-242330-
EASTERN GLACIER MT-NORTHERN ROCKY MOUNTAIN FRONT MT-
449 PM MDT WED JUL 24 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GLACIER COUNTY UNTIL 530
PM MDT...

AT 447 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 30 MILES NORTH OF KIOWA...OR 51 MILES NORTHWEST
OF CUT BANK...MOVING SOUTHEAST AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
CLOUD-TO-GROUND LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE PORT OF PIEGAN...BABB
AND RURAL AREAS OF NORTHERN GLACIER COUNTY.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4901 11305 4901 11302 4895 11268 4863 11291
      4889 11359 4901 11347 4900 11326 4901 11314
      4901 11310 4902 11306
TIME...MOT...LOC 2249Z 298DEG 22KT 4895 11333

MLV

Special weather statement, Jul 24, 4:56 PM MDT, 1 hour 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
456 PM MDT WED JUL 24 2013

MTZ047-242345-
BLAINE MT-
456 PM MDT WED JUL 24 2013

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BLAINE COUNTY UNTIL 545
PM MDT...

AT 452 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 17 MILES NORTHWEST OF HAYS...OR 33 MILES
SOUTHEAST OF CHINOOK...MOVING SOUTHEAST AT 20 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

* LOCATIONS IMPACTED INCLUDE...
  RURAL CENTRAL BLAINE COUNTY...
  RURAL SOUTHEASTERN BLAINE COUNTY...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4819 10849 4799 10869 4815 10904 4831 10891
TIME...MOT...LOC 2256Z 297DEG 19KT 4818 10883

08

Local storm report, Jul 24, 5:50 PM MDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
550 PM MDT WED JUL 24 2013

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

0455 PM     HAIL             6 NNE BABB              48.94N 113.39W
07/24/2013  E1.50 INCH       GLACIER            MT   OTHER FEDERAL

&&

JNS

Local storm report, Jul 24, 5:52 PM MDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
552 PM MDT WED JUL 24 2013

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

0545 PM     HAIL             6 NNE BABB              48.94N 113.39W
07/24/2013  E0.75 INCH       GLACIER            MT   OTHER FEDERAL

0545 PM     TSTM WND GST     6 NNE BABB              48.94N 113.39W
07/24/2013  E60 MPH          GLACIER            MT   OTHER FEDERAL

&&

JNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 6:05 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera	40 min
Jul 24, 6:38 PM MDT	Severe Thunderstorm Warning	TFX	Glacier, Pondera	52 min
Jul 24, 7:17 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton, Toole	43 min
Jul 24, 7:55 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Pondera, Teton	65 min
Jul 24, 8:47 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	43 min
Jul 24, 9:22 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	53 min
Jul 24, 10:07 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	38 min
Jul 24, 10:39 PM MDT	Special Weather Statement	TFX	Judith Basin	66 min
Jul 25, 2:46 PM MDT	Fire Weather Watch	TFX	Broadwater, Gallatin, Glacier, Jefferson, Lewis and Clark, Liberty and 4 more	39 hr

Nearby

Severe Thunderstorm Warnings in Montana, 2013 Every severe thunderstorm warning in 2013

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.