Alert archive / Montana / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 40, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 7, 2013, 4:43 PM MDT for Glacier County, Toole County, Montana. It was in force for 47 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 7, 2013, 4:43 PM MDT (22:43 UTC)
- Expired
- Jul 7, 2013, 5:30 PM MDT
- In force
- 47 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
Counties Glacier County, MT, Toole County, MT
The radar
The Great Falls radar (KTFX), 155 km from the middle of the area, began a volume at 22:43 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 10.7 hours before the alert went out and 184 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.
- Mixed-layer CAPE
- 5 J/kg
- Mixed-layer CIN
- -273 J/kg
- Mixed-layer LCL
- 791 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
082 WUUS55 KTFX 072243 SVRTFX MTC035-101-072330- /O.NEW.KTFX.SV.W.0040.130707T2243Z-130707T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 443 PM MDT SUN JUL 7 2013 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL GLACIER COUNTY IN NORTH CENTRAL MONTANA... WEST CENTRAL TOOLE COUNTY IN NORTH CENTRAL MONTANA... * UNTIL 530 PM MDT * AT 439 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES NORTH OF CUT BANK...MOVING SOUTHEAST AT 20 MPH. * LOCATIONS IN THE WARNING INCLUDE KEVIN. THIS ALSO INCLUDES INTERSTATE 15 BETWEEN MILE MARKERS 381 AND 382. THIS ALSO INCLUDES HIGHWAY 2 BETWEEN MILE MARKERS 261 AND 265. HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH ARE LIKELY WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT SUNDAY EVENING FOR SOUTHWESTERN MONTANA. && LAT...LON 4878 11184 4854 11216 4879 11246 4890 11234 TIME...MOT...LOC 2243Z 306DEG 19KT 4877 11231 $$ FOLTZ
2 follow-up statements
887 WWUS55 KTFX 072258 SVSTFX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 458 PM MDT SUN JUL 7 2013 MTC035-101-072330- /O.CON.KTFX.SV.W.0040.000000T0000Z-130707T2330Z/ TOOLE MT-GLACIER MT- 458 PM MDT SUN JUL 7 2013 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR EAST CENTRAL GLACIER AND WEST CENTRAL TOOLE COUNTIES... AT 457 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 12 MILES WEST OF KEVIN...OR 8 MILES NORTHEAST OF CUT BANK... MOVING SOUTHEAST AT 20 MPH. THIS ALSO INCLUDES INTERSTATE 15 BETWEEN MILE MARKERS 381 AND 382. THIS ALSO INCLUDES HIGHWAY 2 BETWEEN MILE MARKERS 263 AND 265. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTIES. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT SUNDAY EVENING FOR SOUTHWESTERN MONTANA. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4875 11233 4883 11221 4878 11184 4854 11216 TIME...MOT...LOC 2258Z 306DEG 19KT 4872 11221 $$ FOLTZ
696
WWUS55 KTFX 072309
SVSTFX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
509 PM MDT SUN JUL 7 2013
MTC035-072319-
/O.CAN.KTFX.SV.W.0040.000000T0000Z-130707T2330Z/
GLACIER MT-
509 PM MDT SUN JUL 7 2013
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GLACIER COUNTY IS
CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT
SUNDAY EVENING FOR SOUTHWESTERN MONTANA.
LAT...LON 4878 11184 4859 11210 4866 11219 4875 11219
4878 11214
TIME...MOT...LOC 2309Z 306DEG 19KT 4870 11212
$$
MTC101-072330-
/O.CON.KTFX.SV.W.0040.000000T0000Z-130707T2330Z/
TOOLE MT-
509 PM MDT SUN JUL 7 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR WEST CENTRAL TOOLE COUNTY...
AT 507 PM MDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED 8 MILES WEST OF KEVIN...OR 10 MILES
NORTHEAST OF CUT BANK...MOVING SOUTHEAST AT 20 MPH.
THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4878 11184 4859 11210 4866 11219 4875 11219
4878 11214
TIME...MOT...LOC 2309Z 306DEG 19KT 4870 11212
$$
FOLTZWhat 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 7, 2:57 PM MDT, 1 hour 46 minutes earlier.
Area forecast discussion, Jul 7, 2:57 PM MDT, 1 hour 46 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 257 PM MDT Sun Jul 7 2013 .DISCUSSION... Tonight through Thursday...With good instability and some disturbed flow aloft, mainly over the southwest through central zones, thunderstorm activity will continue into the evening and diminish slowly. The zones will then be underneath weak ridging and southwest flow aloft tonight ahead of a low pressure shortwave approaching from the Pacific Northwest. This shortwave will approach the Rockies Monday morning and good lift should be developing over the Rockies by Monday morning and spread east during the day. At lower levels, flow will be from the east to southeast. This will help bring some higher dew point values into the region as well as provide some shear to the vertical profile. Does not seem to be much that would inhibit early convection over the Northern Rockies and adjacent plains, thus could see storms developing early and moving east. The CAPE profile remains strong with height and the airmass will not be particularly warm with wet-bulb zeros around 10K so large hail is possible. Shear overall is not great but the strongest values, those across the central zones (a band including Helena and Lewistown), are significant. The shortwave will be leaving the zones by late Monday evening and heights aloft will once again build...but convective activity will be slow to end. High pressure will continue to build aloft Tuesday and the airmass will generally remain stable and dry. Zelzer Tuesday night through Sunday... The broad upper level trough over Central Canada will transition into to an upper level ridge centered over the Four Corners Region to begin the long term period. A few embedded shortwaves within the flow aloft will move across the region, bringing chances for showers and thunderstorms as the airmass destabilizes each afternoon with peak heating. However the lack of moisture associated with the upper level ridge will severely limit shower and thunderstorm growth to Thursday night and into the weekend. The ridge will begin to slowly weaken and move through out the time period... but little change to the pattern is expected before late Saturday or Sunday when a shortwave trough out of British Columbia moves across the Rockies and brings an associated cold front with it. Temperatures throughout the week will be above seasonal averages. Depending on location and strength of the upper level system on the weekend temperatures may cool back to or slightly below seasonal values for the weekend...however have remain a little more conservative with temperatures for this time frame due to the lack of confidence with the particulars for this system. Suk && .AVIATION... Updated 1710Z. Satellite imagery showed mainly clear skies over the area this morning with the exception of a few isolated showers over central and southwest Montana. Clouds and thunderstorms will increase in coverage this afternoon over southwest Montana and spread into portions of central Montana late tonight. Thunderstorms may also form along the higher terrain of the Rocky Mountain front and move east into the plains this evening. A more vigorous storm system arrives on Monday morning with widespread, possibly severe, thunderstorms developing over portions of central Montana from KCTB to KGTF. Langlieb && .PRELIMINARY POINT TEMPS/POPS... GTF 53 79 51 82 / 10 50 40 10 CTB 52 74 49 80 / 30 60 60 10 HLN 57 84 55 85 / 20 50 30 10 BZN 52 86 49 84 / 30 40 40 10 WEY 42 79 40 78 / 30 40 40 10 DLN 52 85 50 84 / 20 30 30 10 HVR 56 79 54 80 / 20 80 70 20 LWT 54 77 51 77 / 40 70 60 10 && .TFX WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM... LONG TERM... AVIATION... weather.gov/greatfalls
Hazardous weather outlook, Jul 7, 5:48 AM MDT, 10 hours 55 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 548 AM MDT SUN JUL 7 2013 MTZ009>014-044>051-054-081200- NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-CASCADE- CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-TOOLE-LIBERTY- EASTERN PONDERA-BLAINE-SOUTHERN ROCKY MOUNTAIN FRONT- EASTERN TETON-JUDITH BASIN-FERGUS-MEAGHER- 548 AM MDT SUN JUL 7 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ONCE AGAIN THIS AFTERNOON. THE PRIMARY THREATS FROM THESE STORMS WILL BE GUSTY WINDS...SMALL HAIL...AND BRIEF HEAVY RAINFALL. THESE STORMS WILL LIKELY DIMINISH OVERNIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE STORM PREDICTION CENTER HAS THIS PORTION OF NORTH CENTRAL AND CENTRAL MONTANA UNDER A SLIGHT RISK FOR SEVERE THUNDERSTORMS ON MONDAY. THE PRIMARY THREATS FROM ANY SEVERE THUNDERSTORMS WILL LIKELY BE DAMAGING WINDS AND LARGE HAIL...BUT PERIODS OF HEAVY RAINFALL ARE ALSO LIKELY. THIS SITUATION WILL CONTINUE TO BE MONITORED FOR POSSIBLE SEVERE WEATHER HIGHLIGHTS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...ANY REPORTS OF STRONG WIND GUSTS...HAIL...OR HEAVY RAINFALL TO LAW ENFORCEMENT OR THE NATIONAL WEATHER SERVICE OFFICE IN GREAT FALLS ARE ALWAYS APPRECIATED. MTZ008-015-052-053-055-081200- BEAVERHEAD-MADISON-JEFFERSON-BROADWATER-GALLATIN- 548 AM MDT SUN JUL 7 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST MONTANA. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ONCE AGAIN THIS AFTERNOON. THE PRIMARY THREATS FROM THESE STORMS WILL BE GUSTY WINDS...SMALL HAIL...AND BRIEF HEAVY RAINFALL. THESE STORMS WILL LIKELY DIMINISH OVERNIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED FOR MONDAY...WITH GUSTY WINDS...HAIL...AND HEAVY RAINFALL POSSIBLE ONCE AGAIN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...ANY REPORTS OF STRONG WIND GUSTS...HAIL...OR HEAVY RAINFALL TO LAW ENFORCEMENT OR THE NATIONAL WEATHER SERVICE OFFICE IN GREAT FALLS ARE ALWAYS APPRECIATED.
In the hours before
Special weather statement, Jul 7, 2:05 PM MDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 205 PM MDT SUN JUL 7 2013 MTZ008-015-072045- BEAVERHEAD MT-MADISON MT- 205 PM MDT SUN JUL 7 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MADISON AND EASTERN BEAVERHEAD COUNTIES UNTIL 245 PM MDT... AT 200 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 25 MILES SOUTHEAST OF DILLON...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS POSSIBLE WITH THIS STORM...ALONG WITH BRIEF HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. * LOCATIONS IMPACTED INCLUDE... RURAL SOUTHERN MADISON COUNTY... RURAL EASTERN BEAVERHEAD COUNTY... RURAL CENTRAL MADISON COUNTY... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 4525 11184 4493 11172 4487 11233 4507 11242 TIME...MOT...LOC 2004Z 254DEG 18KT 4498 11224 GUSTAFSON
Special weather statement, Jul 7, 2:59 PM MDT, 1 hour 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 259 PM MDT SUN JUL 7 2013 MTZ008-015-072200- BEAVERHEAD MT-MADISON MT- 259 PM MDT SUN JUL 7 2013 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MADISON AND CENTRAL BEAVERHEAD COUNTIES UNTIL 400 PM MDT... AT 300 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS 25 MILES SOUTH OF ALDER...OR 25 MILES SOUTHEAST OF DILLON...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS POSSIBLE WITH THIS STORM...ALONG WITH BRIEF HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. * LOCATIONS IMPACTED INCLUDE... RURAL SOUTHERN MADISON COUNTY... RURAL EASTERN BEAVERHEAD COUNTY... RURAL CENTRAL MADISON COUNTY... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 4554 11144 4493 11140 4466 11282 4507 11301 TIME...MOT...LOC 2058Z 251DEG 17KT 4497 11225 GUSTAFSON
Special weather statement, Jul 7, 3:35 PM MDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 335 PM MDT SUN JUL 7 2013 MTZ010-072215- EASTERN GLACIER MT- 335 PM MDT SUN JUL 7 2013 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GLACIER COUNTY UNTIL 415 PM MDT... AT 334 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 26 MILES NORTHEAST OF BROWNING...OR 27 MILES NORTHWEST OF CUT BANK...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. * LOCATIONS IMPACTED INCLUDE... RURAL NORTHEASTERN GLACIER COUNTY... LAT...LON 4896 11220 4865 11237 4887 11294 4900 11283 TIME...MOT...LOC 2135Z 289DEG 19KT 4890 11276 FOLTZ
Special weather statement, Jul 7, 4:14 PM MDT, 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 414 PM MDT SUN JUL 7 2013 MTZ053-054-072300- BROADWATER MT-MEAGHER MT- 414 PM MDT SUN JUL 7 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MEAGHER AND EXTREME EASTERN BROADWATER COUNTIES UNTIL 500 PM MDT... AT 406 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13 MILES SOUTHWEST OF WHITE SULPHUR SPRINGS... MOVING EAST AT 25 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. * LOCATIONS IMPACTED INCLUDE... WHITE SULPHUR SPRINGS... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT SUNDAY EVENING FOR SOUTHWESTERN MONTANA. LAT...LON 4670 11057 4632 11050 4633 11118 4658 11128 TIME...MOT...LOC 2211Z 261DEG 23KT 4643 11107
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 11:22 PM MDT | Special Weather Statement | TFX | Cascade | 23 min |
| Jul 6, 11:47 PM MDT | Special Weather Statement | TFX | Cascade | 28 min |
| Jul 7, 2:05 PM MDT | Special Weather Statement | TFX | Madison | 40 min |
| Jul 7, 2:59 PM MDT | Special Weather Statement | TFX | Madison | 61 min |
| Jul 7, 3:24 PM MDT | Severe Thunderstorm Warning | TFX | Madison | 51 min |
| Jul 7, 3:35 PM MDT | Special Weather Statement | TFX | Glacier | 40 min |
| Jul 7, 3:57 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Toole | 48 min |
| Jul 7, 4:14 PM MDT | Special Weather Statement | TFX | Meagher | 46 min |
| Jul 7, 4:52 PM MDT | Special Weather Statement | TFX | Madison | 38 min |
| Jul 7, 5:01 PM MDT | Special Weather Statement | TFX | Glacier | 44 min |
| Jul 7, 5:04 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 41 min |
| Jul 7, 5:18 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 42 min |
| Jul 7, 5:34 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson | 41 min |
| Jul 7, 5:42 PM MDT | Special Weather Statement | TFX | Glacier | 48 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2013Every 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.