Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 16, NWS Great Falls, MT

June 28, 2001Meagher County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 28, 2001, 1:45 AM MDT for Meagher County, Montana. It was in force for 30 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: Jun 28, 2001, 1:45 AM MDT (07:45 UTC)
Expired: Jun 28, 2001, 2:15 AM MDT
In force: 30 min
Issued by: NWS Great Falls, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Meagher County, MT

The radar

The Great Falls radar (KTFX), 115 km from the middle of the area, began a volume at 07:46 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, 7.8 hours before the alert went out and 110 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1392 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 2183 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

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

290 
WUUS55 KTFX 280745
SVRGTF
MTC059-280815-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
145 AM MDT THU JUN 28 2001

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MEAGHER COUNTY IN CENTRAL MONTANA
  THIS INCLUDES THE CITY OF WHITE SULPHUR SPRINGS

* UNTIL 215 AM MDT

* AT 141 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES SOUTH OF WHITE SULPHUR SPRINGS...MOVING
  NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL EASTERN MEAGHER COUNTY AT 200 AM MDT

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 4644 11109 4631 11090 4655 11050 4671 11073

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 Jun 27, 9:40 PM MDT, 4 hours 5 minutes earlier.

Area forecast discussion, Jun 27, 9:40 PM MDT, 4 hours 5 minutes before

SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
940 PM MDT WED JUN 27 2001

LINE OF THUNDERSTORMS STRETCHED ACROSS EASTERN CWA...NEAR HVR/LWT
LINE AT 03Z. HAVE RECEIVED REPORTS OF AREAS OF HEAVY RAIN AND SMALL
HAIL WITH STORMS WITH RADAR INDICATING A FEW STRONGER STORMS. LINE
PUSHING INTO MORE UNSTABLE ENVIRONMENT AND EXPECT ACTIVITY TO
INCREASE AS LINE MOVES EAST. SEVERE THUNDERSTORM WATCH IN EFFECT FOR
HILL...BLAINE...CHOUTEAU...FERGUS AND JUDITH BASIN COUNTIES UNTIL 1
AM MDT. ISOLATED TO SCATTERED THUNDERSTORMS REDEVELOPING OVER WESTERN
CWA STRETCHING BACK INTO EASTERN WA TO SOUTHWEST ID. WILL DROP
CHANCES OF PRECIP SLIGHTLY BEHIND LINE AND WORD FOR DECREASING
ACTIVITY AFTER MIDNIGHT. FOR THURSDAY AND FRIDAY...UPPER FLOW BECOMES
MORE CYCLONIC...ALTHOUGH RESIDUAL INSTABILITY AND WEAK SHORTWAVES
AFFECTING THE SOUTHEAST ZONES WILL ALLOW FOR ISOLATED THUNDERSTORMS
DURING THE AFTERNOON AND EVENING.

EXTENDED...UPPER LEVEL LOW PRESSURE TROUGH REMAINS CENTERED OFF BC
COAST EARLY IN PERIOD WITH HIGH PRESSURE RIDGE CENTERED OVER FOUR
CORNERS REGION. TROUGH CONTINUES TO SPIN DISTURBANCES INLAND WITH
SOUTHWEST FLOW OVER PACIFIC NORTHWEST STEERING THE DISTURBANCES
INTO WESTERN MONTANA. THE STRONGEST OF THESE WILL BRUSH ACROSS THE
NORTHWEST AND NORTHERN PORTION OF THE CWA SATURDAY NIGHT AND SUNDAY
FOR THE BEST CHANCE OF SHOWERS. AS THIS DISTURBANCE EXITS...THE
HIGH PRESSURE RIDGE BEGINS STRENGTHENING AND RETROGRADING...WITH
THE CENTER OVER NORTHWEST WY AND THE AXIS SHIFTING TO THE MT/ID
BORDER. THIS SHIFT WILL KEEP TEMPERATURES SEASONABLY WARM WITH ONLY
ISOLATED AFTERNOON SHOWERS OR THUNDERSTORMS OVER THE MOUNTAINS.

GTF BB 054/078 050/078 048 19211
CTB BB 050/072 047/072 045 19511
HLN BB 045/080 050/080 050 19211
BZN BB 052/080 049/080 048 19222
WEY BB 046/072 044/074 042 19222
DLN BB 051/078 047/078 056 19411
HVR BU 054/083 050/083 050 19611
LWT BB 053/074 048/074 046 19422

In the hours before

Special weather statement, Jun 27, 10:30 PM MDT, 3 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1030 PM MDT WED JUN 27 2001

MTZ011-013-016-021-047-050-051-059-060-280530-
BLAINE-CENTRAL AND SOUTHEAST PHILLIPS-CHOUTEAU-FERGUS-HILL-JUDITH
BASIN-NORTHERN PHILLIPS-PETROLEUM-SOUTHWEST PHILLIPS-
1030 PM MDT WED JUN 27 2001

THE NATIONAL WEATHER SERVICE HAS CLEARED THE FOLLOWING COUNTIES FROM
SEVERE THUNDERSTORM WATCH NUMBER 474...

IN NORTH CENTRAL MONTANA:

BLAINE               CHOUTEAU            HILL

SEVERE THUNDERSTORM WATCH NUMBER 474 REMAINS IN EFFECT UNTIL 1 AM
MDT FOR...FERGUS...JUDITH BASIN...PETROLEUM AND PHILLIPS COUNTIES.

Special weather statement, Jun 28, 1:02 AM MDT, 43 minutes before

MTZ011-013-047-050-051-280800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
102 AM MDT THU JUN 28 2001

...SEVERE THUNDERSTORM WATCH HAS EXPIRED...

THE SEVERE THUNDERSTORM WATCH THAT HAD BEEN IN EFFECT FOR
BLAINE...HILL...CHOUTEAU...JUDITH BASIN AND FERGUS COUNTIES HAS BEEN
ALLOWED TO EXPIRE.

NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO SHOW NUMEROUS
THUNDERSTORMS STILL CONTINUING OVER THE REGION. THESE STORMS ARE
SLOWLY WEAKENING AND THE THREAT OF SEVERE WEATHER HAS ENDED.
HOWEVER...THESE STORMS ARE STILL CAPABLE OF PRODUCING GUSTY WINDS
NEAR 45 MPH... SMALL HAIL AND HEAVY RAINFALL FOR THE NEXT SEVERAL
HOURS.

A FLASH FLOOD WARNING CONTINUES UNTIL 415 AM FOR WEST CENTRAL FERGUS
COUNTY...NORTH CENTRAL JUDITH BASIN COUNTY AND EXTREME SOUTHEASTERN
CHOUTEAU COUNTY.

GOUDSWARD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 6:30 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	45 min
Jun 27, 7:27 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus, Judith Basin	48 min
Jun 27, 9:09 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	51 min
Jun 27, 10:00 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	45 min
Jun 27, 11:14 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	46 min
Jun 28, 12:14 AM MDT	Flash Flood Warning	TFX	Chouteau, Fergus, Judith Basin	4 hr
Jun 28, 12:34 AM MDT	Severe Thunderstorm Warning	TFX	Fergus	41 min
Jun 28, 2:56 AM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	49 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every 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.