Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 27, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 12, 2001, 4:36 PM MDT for Cascade County, Montana. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 12, 2001, 4:36 PM MDT (22:36 UTC)
- Expired
- Jul 12, 2001, 5:15 PM MDT
- In force
- 39 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Cascade County, MT
The radar
The Great Falls radar (KTFX), 43 km from the middle of the area, began a volume at 22:37 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
Great_falls, MT (KTFX), launched 12:00Z, 10.6 hours before the alert went out and 89 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2375 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS55 KTFX 122236
SVRGTF
MTC013-122315-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
436 PM MDT THU JUL 12 2001
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN AND SOUTH CENTRAL CASCADE COUNTY IN CENTRAL MONTANA
* UNTIL 515 PM MDT
* AT 430 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER SOUTHWESTERN CASCADE COUNTY...OR ABOUT 12
MILES SOUTH OF CASCADE...MOVING EAST AT 20 MPH.
* THE SEVERE THUNDERSTORM WILL BE LOCATED...
15 MILES SOUTHEAST OF CASCADE AT 515 PM MDT.
VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREAT FALLS.
LAT...LON 4716 11191 4714 11188 4713 11180 4701 11180
4702 11143 4704 11128 4735 11142What 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 12, 2:37 PM MDT, 1 hour 59 minutes earlier.
Area forecast discussion, Jul 12, 2:37 PM MDT, 1 hour 59 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 237 PM MDT THU JUL 12 2001 SYNOPSIS...LITTLE CHANGE EXPECTED. WARM TEMPERATURES TO CONTINUE COUPLED WITH AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. DISCUSSION...PERSISTENT PATTERN REMAINS IN PLACE...UPPER LEVEL HIGH PRESSURE RIDGE CENTERED OVER TX/NM BORDER WITH LOW PRESSURE TROUGH OFF WEST COAST. SOUTHWEST FLOW CONTINUES TO FEED MOIST...UNSTABLE AIR INTO CWA. SEVERAL EMBEDDED DISTURBANCES IN THE SOUTHWEST FLOW... THOUGH MODELS APPEAR TO BE HAVING SOME DIFFICULTY IN RESOLUTION OF LOCATION AND TRACKING. DYNAMICALLY...HAVE LI/S SLIGHTLY BELOW ZERO ACROSS THE CWA WITH ISOLATED AREAS AT OR BELOW -5 ACCORDING TO GOES IMAGER...AREAS OF LOWER LEVEL CONVERGENCE AND UPPER LEVEL CONVERGENCE...COOL AIR BOUNDARY STRETCHED ACROSS THE NORTHERN CWA... AND A DEEP MOISTURE LAYER WITH DEW POINTS IN THE MID 50S. SEVERAL STORMS WERE DEVELOPING OVER THE CWA AT 20Z...MAINLY ALONG LEADING EDGE OF DRY SLOT WORKING INTO CWA FROM THE SOUTHWEST. SOUTHWEST AND NORTHEAST CWA SEEM MOSTLY LIKELY TO SEE SHOWERS AND/OR THUNDERSTORMS TONIGHT...AND THERE IS THE POSSIBILITY THAT SOME COULD BE SEVERE. DYNAMICS INCREASE SOME TOMORROW...AVN AND NGM DROP LI/S AS FAR AND -8...BELIEVE THIS MAY BE OVERDONE BUT DO EXPECT AN ACTIVE DAY. WILL KEEP TEMPERATURES NEAR TO SLIGHTLY ABOVE THOSE TODAY MOST AREAS...AND WILL PUT POPS IN HIGHER SCATTERED CATEGORY. .EXTENDED...MRF AND ECMF IN FAIRLY GOOD AGREEMENT THROUGH THE PERIOD WITH KEEPING THE UPPER RIDGE ANCHORED OVER THE MIDWEST AND A TROUGH OVER THE NORTHWEST. LITTLE HEIGHT CHANGE OVER US DESPITE UPPER LOW MOVING NORTHEAST INTO ALBERTA. THIS REGIME OF MOIST/UNSTABLE SOUTHWESTERLY FLOW WILL KEEP US IN UNSETTLED PERIOD RESULTING IN LITTLE CHANGE TO EXTENDED. SCHMIDT CCF NUMBERS GTF TB 058/086 055/087 054 03533 CTB TB 055/082 052/084 052 03533 HLN TB 058/088 055/090 055 03554 BZN TB 055/086 054/087 054 03433 WEY TB 048/077 047/080 047 03434 DLN TB 053/083 053/085 054 03433 HVR EB 055/093 057/095 057 03534 LWT TB 055/085 054/086 055 03535
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 3:08 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 67 min |
| Jul 12, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 45 min |
| Jul 12, 4:24 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Lewis and Clark | 36 min |
| Jul 12, 5:02 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 43 min |
| Jul 12, 5:47 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 28 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001
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.