Alert archive / Montana / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 91, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 19, 2000, 8:32 PM MDT for Fergus County, Montana. It was in force for 28 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 19, 2000, 8:32 PM MDT (02:32 UTC)
- Expired
- Jul 19, 2000, 9:00 PM MDT
- In force
- 28 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Fergus County, MT
The radar
The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 02:36 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 00:00Z, 2.5 hours before the alert went out and 106 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
- 291 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 2863 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 37 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 200233 SVRGTF MTC027-200300- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 832 PM MDT WED JUL 19 2000 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL FERGUS COUNTY IN MONTANA * UNTIL 900 PM MDT * AT 823 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER SOUTH CENTRAL FERGUS COUNTY...OR ABOUT 5 MILES SOUTHEAST OF LEWISTOWN...MOVING SOUTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RURAL SOUTHERN FERGUS COUNTY AT 850 PM MDT HEAVY RAIN ALONG WITH MINOR FLOODING AND HAIL UP TO NICKEL SIZE HAVE BEEN REPORTED WITH THIS STORM. 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 4710 10930 4698 10949 4678 10921 4677 10884
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 19, 3:00 PM MDT, 5 hours 32 minutes earlier.
Area forecast discussion, Jul 19, 3:00 PM MDT, 5 hours 32 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT WED JUL 19 2000 ALL THE INGREDIENTS TODAY FOR DEEP CONVECTION EXCEPT FOR SHEAR AND FORCING ALOFT. MESOANALYSIS SHOWS A GOOD CONVERGENCE ZONE BOUNDARY ALONG A HAVRE TO MILES CITY LINE...HIGH DEW POINTS AND LOTS OF INSOLATION THIS AFTERNOON. THIS MORNINGS SOUNDING SHOWS WEAK WINDS THROUGHOUT DEPTH OF TROP SO THREAT OF BRIEF HEAVY RAINS WITH ANY TSTMS THAT FORM. ETA AND AVN NOT IN AGREEMENT ON PATTERN EVOLUTION NEXT 48 HRS. AVN MORE PESSIMISTIC IN HOLDING RIDGE TO THE WEST AND IN BRINGING SHORT WAVES THROUGH THE AREA INTO FRIDAY. WILL HOLD AT LEAST ISOLATED SHWRS/TSTMS THROUGH FRIDAY. CROSS SECTIONS ALSO SUGGEST AT LEAST A MODERATE AMOUNT OF MID AND UPPER LEVEL MOISTURE WITH DECENT VERTICAL MOTION FIELDS...PEAKING AROUND 00Z NEXT TWO DAYS. MIELKE EXTENDED OUTLOOK...MODELS IN CLOSER AGREEMENT TODAY THAN YESTERDAY...HOWEVER SIGNIFICANT DIFFERENCES STILL REMAIN FOR DAYS 4 AND 5. LAST PERIOD OF AVN/UKMET HAVE UPPER LEVEL RIDGE AXIS OVER WESTERN MONTANA WITH SHORTWAVE TROUGH JUST OFF PACIFIC NORTHWEST COAST...WITH ECMWF IN GOOD AGREEMENT. FOR SAME TIME PERIOD...NOGAPS HAS SHORTWAVE OVER PACIFIC NORTHWEST AND MRF SLOWER WITH SHORTWAVE PROGRESS THAN ECMWF. THESE TRENDS CONTINUE THROUGH MONDAY...WITH MRF SLOWEST...NOGAPS QUICKEST...AND ECMWF IN BETWEEN. ECMWF/MRF BRING SHORTWAVE FARTHER NORTH OVER RIDGE THAN NOGAPS FOR SUNDAY AND MONDAY...KEEPING BEST CHANCE OF PRECIPITATION ACROSS NORTHERN ZONES. WILL GENERALLY GO WITH SLOWER ECMWF/MRF IDEA...AS MODELS IN GENERAL HAVE BEEN SLOWING THINGS DOWN EACH RUN. AT SURFACE...COLD FRONT DEVELOPS OVER MONTANA ON SATURDAY AND MODELS PROGRESS IT EASTWARD AT SPEEDS SIMILAR TO SHORTWAVE MOVEMENTS. LOOKS LIKE WESTERLY WINDS SHOULD DEVELOP BEHIND FRONT REGARDLESS. BOTTOM LINE...MOSTLY DRY AND WARM SATURDAY WITH RIDGE OVERHEAD...THEN ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS SUNDAY AND MONDAY WITH COOLER TEMPERATURES. COULSTON CCF NUMBERS GTF BB 053/085 055/088 057 013222 CTB BB 051/083 053/086 055 013222 HLN BB 055/088 056/092 057 013222 BZN CB 050/085 052/090 05I4 014232 WEY CB 042/077 044/082 045 015332 DLN BB 050/083 050/085 050 013222 HVR CB 055/086 057/090 058 014332 LWT CB 052/082 052/088 052 014332
In the hours before
Local storm report, Jul 19, 7:16 PM MDT, 1 hour 16 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
716 PM MDT WED JUL 19 2000
TIME(MDT) .....EVENT LOCATION..... ST ...EVENT/REMARKS...........
.....COUNTY LOCATION.....
0320 PM 22 N CHINOOK MT 0.25 INCH HAIL
07/19/00 BLAINE
0320 PM 22 N CHINOOK MT 70 MPH TSTM GUST
07/19/00 BLAINE
0415 PM 2 SE ZURICH MT 0.50 INCH HAIL
07/19/00 BLAINE
0520 PM 25 S HARLEM MT 0.88 INCH HAIL
07/19/00 BLAINE
0535 PM 33 S LLOYD MT 0.88 INCH HAIL
07/19/00 BLAINE
0535 PM 33 S LLOYD MT 65 MPH TSTM GUST
07/19/00 BLAINE
0543 PM LODGEPOLE MT 0.75 INCH HAIL
07/19/00 BLAINE \ VERY STRONG WINDS
NNNNNearby
Severe Thunderstorm Warnings in Montana, 2000Every severe thunderstorm warning in 2000
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.