Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 22, NWS Great Falls, MT

July 1, 2000Blaine County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 1, 2000, 8:15 PM MDT for Blaine County, Montana. It was in force for 45 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 1, 2000, 8:15 PM MDT (02:15 UTC)
Expired
Jul 1, 2000, 9:00 PM MDT
In force
45 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 174 km from the middle of the area, began a volume at 02:14 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, 2.3 hours before the alert went out and 163 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-pSkew-T log-p diagram, Great_falls, MT at 00:00Z on 2000-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 497 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 2000-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
497 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
2161 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

848 
WUUS55 KTFX 020218
SVRGTF
MTC005-020300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
815 PM MDT SAT JUL 1 2000

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BLAINE COUNTY IN NORTH CENTRAL MONTANA

* UNTIL 900 PM MDT

* AT 812 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 27 MILES NORTHWEST OF TURNER...OR ABOUT 42
  MILES NORTHEAST OF CHINOOK...MOVING SOUTHEAST AT 20 MPH.

VERY LARGE HAIL AND STRONG...GUSTY WINDS ARE 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 4914 10900 4848 10865 4872 10781 4919 10861

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 1, 8:10 PM MDT, 5 minutes earlier.

Area forecast discussion, Jul 1, 8:10 PM MDT, 5 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
810 PM MDT SAT JUL 1 2000

...WILL UPDATE ZONE AND STATE FORECASTS BY 900 PM...

DEEPENING UPPER TROUGH OVER PAC NW WITH STATE UNDER SWLY FLOW ALOFT.
SATELLITE IMAGERY SHOWS MOISTURE CONTINUING TO STREAM INTO STATE. QUITE
A NUMBER OF THUNDERSTORMS HAVE SWEPT FROM SW MT NEWD INTO THE NORTH
CENTRAL PART OF THE STATE THIS EVENING. ALTHOUGH NO REPORTS OF SEVERE WX
WERE RECEIVED MANY LOCATIONS RECEIVED BRIEF HEAVY RAIN WITH THE STORMS.
THIS IS IN KEEPING WITH 00Z TFX SOUNDING WHICH INDICATES A LIFTED INDEX
OF -5 AND AN INCH OF PRECIPITABLE WATER. BRUNT OF CONVECTIVE ACTIVITY IS
NOW OVER ERN PORTION GTF CWFA. SOME STORMS ARE LINGERING FROM NORTH OF
DILLON TO S OF HELENA TO ALONG THE ROCKY MOUNTAIN FRONT THOUGH. EXPECT
MOST OF THESE SRN STORMS TO DIE OUT OVER NEXT COUPLE OF HOURS. HOWEVER
STORMS ALONG THE HI-LINE MAY LINGER UNTIL AROUND MIDNIGHT. WILL UPDATE
ZONE AND STATE FORECASTS TO FRESHEN WORDING. OTHERWISE CURRENT FORECAST
HANDLES SITUATION WELL. BRITTON

EXTENDED...MEAN UPPER TROUGH REMAINS IN PLACE OVER ERN PAC AND WRN US
THROUGH EXTENDED PERIOD. UPPER LOW OVER SRN ALBERTA DRAGS TROUGH AND
ASSOCIATED COLD FRONT ACROSS STATE ON TUESDAY. THIS WILL KEEP GTF CWFA
UNDER SWLY FLOW ALOFT AND WILL PRODUCE A CHANCE OF SHOWERS AND
THUNDERSTORMS ON THE FOURTH OF JULY. UPPER LOW SPLITS WITH ONE LOW TO
MOVE SLOWLY ACROSS SRN PRAIRIE PROVINCES WHILE THE OTHER LOW WOBBLES OVR
W COAST. HEIGHTS RISE A LITTLE WEDNESDAY AND THURSDAY AS WEAK...
NEGATIVELY TILTED RIDGE PUSHES NWWD BETWEEN TWO UPPER LOWS RESULTING IN
WARMING TREND BEGINNING WED. WITH WEAK SFC LOW PRESSURE OVER AREA WED
AND THU AS WELL AS RESIDUAL MOISTURE FROM PREVIOUS SYSTEM WILL KEEP
MENTION OF ISOLATED SHOWERS AND THUNDERSTORMS BOTH DAYS. BRITTON

CCF NUMBERS
GTF WB 054/075 050/072 048 044643
CTB EN 049/072 046/068 044 0/42322
HLN WE 056/076 054/073 049 046655
BZN TW 052/078 052/073 047 046666
WEY TT 045/073 044/073 041 046666
DLN TW 050/078 048/073 045 045666
HVR WB 055/078 052/075 051 043533
LWT WB 052/078 050/074 045 046664

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 4:12 PM MDTSevere Thunderstorm WarningTFXFergus33 min
Jul 2, 4:20 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau25 min
Jul 2, 4:59 PM MDTSevere Thunderstorm WarningTFXFergus31 min
Jul 2, 5:29 PM MDTSevere Thunderstorm WarningTFXLewis and Clark46 min
Jul 2, 5:32 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin43 min
Jul 2, 5:34 PM MDTSevere Thunderstorm WarningTFXBlaine41 min

Nearby

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.