Flash Flood Warning 2, NWS Great Falls, MT

Issued

Aug 28, 1999, 12:30 PM MDT (18:30 UTC)

Expired

Aug 28, 1999, 3:30 PM MDT

In force

3 hr

Issued by

NWS Great Falls, MT

Area

Whole counties; the outline is the Mesonet’s reconstruction

Counties Blaine County, MT, Fergus County, MT

The Glasgow radar (KGGW), 160 km from the middle of the area, began a volume at 18:29 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 
TTAA00 KTFX 281832
FFWGTF
MTC005-027-282130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1230 PM MDT SAT AUG 28 1999

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTH CENTRAL BLAINE COUNTY IN MONTANA
  NORTHEASTERN FERGUS COUNTY IN MONTANA

* UNTIL 330 PM MDT

* AT 1218 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN ALONG THE BORDER BETWEEN FERGUS AND PHILLIPS COUNTIES. STORMS 
  WERE MOVING SLOWLY TO THE NORTHWEST AT 15 MPH. MORE STORMS ARE     
  EXPECTED OVER THIS AREA. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
GREAT FALLS.

LAT...LON 4747 10872 4759 10828 4795 10861 478F1 10914

NWS Great Falls, MT wrote its last area forecast discussion before this flash flood warning went out at Aug 28, 10:00 AM MDT, 2 hours 30 minutes earlier.

SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
1000 AM MDT SAT AUG 28 1999
...UPDATES PLANNED FOR ZONES AND STATE...
MODEL INITIALIZATIONS DO NOT APPEAR TO HAVE GOOD HANDLE ON VORTICITY
CENTERS THAT WERE OVER NW WY AND ALSO SE ID AT 12Z ACCORDING TO WATER
VAPOR IMAGERY. THUS DO NOT HAVE A LOT OF CONFIDENCE IN MODEL SOLUTIONS
FOR 12Z RUNS. SATELLITE IMAGERY INDICATES SE ID VORTICITY CENTER IS
MOVING ENE WHILE TRACK OF NW WY CENTER IS HARDER TO TELL BUT APPEARS TO
BE HEADED NE. LATEST ETA INITIALIZES VORTICITY CENTER OVER SW MT AND
TRACKS IT N. THIS SOLUTION APPEARS UNREASONABLE. NGM HAS A VORTICITY
CENTER OVER SE MT AT 00Z. THIS MAY BE BETTER BUT POSSIBLY TOO FAR E.
CURRENT FORECAST WHICH HAS POPS GENERALLY AT 60 TO 70 PCT LOOKS OK BUT
WILL RAISE THEM SOME OVER CENTRAL AND SRN SECTIONS. WITH UPSLOPE FLOW
WILL REWORD PRECIPITATION AS PERIODS OF RAIN RATHER THAN SHOWERS.
BIGGEST CHANGE WILL BE LOWERING FORECAST MAX TEMPERATURES AROUND 5 TO 10
DEGREES FOR TODAY. WITH COOLER TEMPERATURES NOT VERY EXCITED ABOUT
THREAT OF THUNDERSTORMS BUT CHECK OF FORECAST SOUNDINGS INDICATES THERE
STILL IS A THREAT FOR THIS AFTERNOON AND ^EARLY EVENING. LATEST NGM/ETA
STILL INDICATE WEAK RIDGING DEVELOPING OVER FORECAST AREA SUN FOR
DIMINISHED THREAT OF PRECIPITATION. THIS HANDLED WELL BY CURRENT
FORECAST. BLANK
GTF 774 HLN 873 HVR 675

Flash Flood Warnings in Montana, 1999Every flash flood warning in 1999

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.