Severe Thunderstorm Warning 13, NWS Great Falls, MT

Issued

Jun 19, 1999, 4:54 PM MDT (22:54 UTC)

Expired

Jun 19, 1999, 5:30 PM MDT

In force

36 min

Issued by

NWS Great Falls, MT

Area

Whole counties

County Gallatin County, MT

The Billings radar (KBLX), 202 km from the middle of the area, began a volume at 22:54 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.

380 
WUUS1 KGTF 192259 RRA
SVRGTF
MTC031-192330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
454 PM MDT SAT JUN 19 1999

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GALLATIN COUNTY IN MONTANA
  THIS INCLUDES THE CITY OF BOZEMAN

* UNTIL 530 PM MDT

* AT 442 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES SOUTHWEST OF BOZEMAN...MOVING
  NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER BOZEMAN AT 505 PM MDT

VERY LARGE HAIL IS 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 4562 11132 4550 11113 4573 11081 4586 11103

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 19, 2:30 PM MDT, 2 hours 24 minutes earlier.

SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
230 PM MDT SAT JUN 19 1999

SHORTWAVE MOVING THROUGH NRN AREA OF CWA WITH DEVELOPMENT OF CLOUDS OVER
THE MOUNTAINS. DRIER AIR STILL WORKING ITS WAY DOWN INTO CWA FROM CANADA
AND INHIBITING POTENTIAL OF THUNDERSTORMS. MOISTURE CONVERGENCE AND
THETA-E POTENTIAL GREATEST TO THE EAST OF THE CWA.ALL MODELS AGREE ON
SOUTHWEST FLOW ALOFT AS NEXT LOW PRESSURE SYSTEM DIGS DOWN TOWARDS PAC
COAST. GUSTY SOUTHWEST WINDS TO DIMINISH AFTER DARK AND TO PICK UP AGAIN
ON SUNDAY DUE TO TIGHTER GRADIENT ALOFT AND WINDS SHOULD HOOK UP WELL
WITH SURFACE HEATING.MODELS DIFFER WITH THE FINER DETAILS SUCH AS WHERE
AND WHEN THE SURFACE LOW WILL DEVELOP. WILL HINT AT SHOWERS ON MONDAY AS
UPSLOPE SHOULD DEVELOP...HOW MUCH AND HOW LONG AGAIN DEPENDS ON TIMING
OF COLD FRONT. TEMPERATURES SHOULD WARM UP SUNDAY AND BE A LITTLE COOLER
ON MONDAY.

EXTENDED SHOWS NEXT UPPER TROF MOVING THROUGH CWS MONDAY NIGHT AND
TUESDAY BRINGING COOLER AIR AND NOT A LOT OF MOISTURE. ZONAL FLOW AND
DRY ON WEDNESDAY AND SOUTHWEST FLOW ON THURSDAY WITH WARMING AND
INCREASE OF SHOWERS. CAMP

GTF 1112 HLN 1123 HVR 1123

Severe Thunderstorm Warnings in Montana, 1999Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.