Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 30, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 12, 2001, 7:25 PM MDT for Hill County, Montana. It was in force for 50 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 12, 2001, 7:25 PM MDT (01:25 UTC)
- Expired
- Jul 12, 2001, 8:15 PM MDT
- In force
- 50 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Hill County, MT
The radar
The Great Falls radar (KTFX), 161 km from the middle of the area, began a volume at 01:28 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 7:40 PM MDT | Hail 0.75 | Havre, MT | Reported by former National Weather Service employee in Havre. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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 12, 6:15 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 1.4 hours before the alert went out and 135 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
- 255 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1606 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTFX 130125 SVRGTF MTC041-130215- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 725 PM MDT THU JUL 12 2001 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL HILL COUNTY IN NORTH CENTRAL MONTANA THIS INCLUDES THE CITY OF HAVRE * UNTIL 815 PM MDT * AT 718 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM AT HAVRE...MOVING NEARLY STATIONARY. HAIL UP TO 1 INCH IN DIAMETER HAS BEEN REPORTED WITH THIS STORM. 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. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT FRIDAY MORNING FOR NORTH CENTRAL MONTANA. LAT...LON 4863 10955 4857 10999 4837 10985 4839 10953
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 12, 2:37 PM MDT, 4 hours 48 minutes earlier.
Area forecast discussion, Jul 12, 2:37 PM MDT, 4 hours 48 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, 7:43 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 32 min |
| Jul 12, 7:48 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 27 min |
| Jul 13, 12:58 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 32 min |
| Jul 13, 1:32 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 28 min |
| Jul 13, 2:52 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 28 min |
| Jul 13, 3:21 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 24 min |
| Jul 13, 5:20 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 40 min |
| Jul 13, 5:57 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 48 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.