Severe Thunderstorm Warning 11, NWS Great Falls, MT

Issued

Jun 27, 2001, 7:27 PM MDT (01:27 UTC)

Expired

Jun 27, 2001, 8:15 PM MDT

In force

48 min

Issued by

NWS Great Falls, MT

Area

Whole counties; the outline is the Mesonet’s reconstruction

Counties Chouteau County, MT, Fergus County, MT, Judith Basin County, MT

The Great Falls radar (KTFX), 89 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.

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.

000 
WUUS55 KTFX 280128
SVRGTF

MTC015-027-045-280215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
727 PM MDT WED JUN 27 2001

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME WEST CENTRAL FERGUS COUNTY IN CENTRAL MONTANA
  NORTHEASTERN JUDITH BASIN COUNTY IN CENTRAL MONTANA   
  EASTERN CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA

* UNTIL 815 PM MDT

* AT 723 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 20 MILES SOUTHWEST OF BIG SANDY
  TO 10 MILES NORTHWEST OF STANFORD...OR FROM 15 MILES NORTHEAST OF
  FORT BENTON TO 10 MILES NORTHWEST OF STANFORD...MOVING NORTHEAST AT 20
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STANFORD AT 735 PM MDT
  DENTON AT 805 PM MDT

AT 710 PM A WEATHER SPOTTER NEAR RAYNESFORD REPORTED WALNUT SIZE 
HAIL WITH THIS STORM. VERY LARGE HAIL IS STILL 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 T
O THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREAT FALLS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MDT
THURSDAY MORNING FOR NORTH CENTRAL MONTANA.

LAT...LON 4828 11062 4710 11040 4708 10983 4829 11008

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 2:45 PM MDT, 4 hours 42 minutes earlier.

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

AIR EVEN MORE MOIST THAN ANTICIPATED ACROSS MOST OF THE CWA THIS
AFTERNOON WITH LOW LEVEL EASTERLY FLOW. MSAS PLOT AND MODIFIED 12Z
SOUNDING INDICATING AN LI OF -6 OVER GTF AT 2 PM. THE QUESTION IS...
WHERE WILL THE TRIGGER COME FROM TO START CONVECTION? FRONT AND
ASSOCIATED SHOWERS LYING ALONG THE WESTERN BORDER IS THE BEST
POSSIBILITY. THIS FEATURE SEEMS TO BE MOVING SLOWER THAT MODELS HAD
INDICATED...BUT CONVECTION ALSO OCCURRING AHEAD OF IT. STRONGER
SHORTWAVE IN WYOMING WILL MOVE INTO EASTERN MONTANA AND NOT BE A
FACTOR IN OUR FORECAST. FLOW ALOFT BECOMES INCREASING DIFFLUENT OVER
THE NEXT 6-12 HOURS...SO WILL CONTINUE WITH SCATTERED POPS TONIGHT...
EXCEPT FOR NORTHEAST ZONES WHERE LIKELY POPS WILL BE USED. BEST
MOISTURE CONVERGENCE OCCURS THERE AROUND 06Z...AND WITH THE SUN
BREAKING OUT THIS AFTERNOON...TEMPERATURES MAY STILL BE IN THE 70S BY
THE TIME THE BOUNDARY MAKES IT THERE. 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. POMEROY

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

Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001

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.