Severe Thunderstorm Warning 32, NWS Great Falls, MT

Issued

Jul 12, 2001, 7:48 PM MDT (01:48 UTC)

Expired

Jul 12, 2001, 8:15 PM MDT

In force

27 min

Issued by

NWS Great Falls, MT

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Fergus County, MT

The Great Falls radar (KTFX), 168 km from the middle of the area, began a volume at 01:48 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.

000 
WUUS55 KTFX 130149
SVRGTF

MTC005-027-130215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
748 PM MDT THU JUL 12 2001

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTH CENTRAL FERGUS COUNTY IN CENTRAL MONTANA
  EXTREME SOUTH CENTRAL BLAINE COUNTY IN NORTH CENTRAL MONTANA

* UNTIL 815 PM MDT

* AT 738 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME SOUTHWESTERN BLAINE COUNTY...OR
  ABOUT 42 MILES SOUTHEAST OF BIG SANDY...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL NORTHERN FERGUS COUNTY AT 800 PM MDT
RURAL SOUTHERN BLAINE COUNTY AT 800 PM MDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE 
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...DEADLY 
LIGHTNING...AND HEAVY RAIN. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 THUNDERSTrORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT
FRIDAY MORNING FOR NORTH CENTRAL MONTANA.

LAT...LON 4793 10937 4775 10942 4769 10896 4789 10894

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 2:37 PM MDT, 5 hours 11 minutes earlier.

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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.