Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 87, NWS Glasgow, MT

July 6, 2000McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 6, 2000, 1:49 AM MDT for McCone County, Montana. It was in force for 56 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: Jul 6, 2000, 1:49 AM MDT (07:49 UTC)
Expired: Jul 6, 2000, 2:45 AM MDT
In force: 56 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County McCone County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 5, 11:15 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 7.8 hours before the alert went out and 86 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: 1390 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1773 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

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

362 
WUUS55 KGGW 060749
SVRGGW
MTC055-060845-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
149 AM MDT THU JUL 6 2000

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCCONE COUNTY IN NORTHEAST MONTANA

* UNTIL 245 AM MDT

* AT 146 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 15 MILES NORTH OF NELSON CREEK
  RECREATION AREA TO 18 MILES SOUTHEAST OF VIDA...OR FROM 32 MILES
  SOUTHWEST OF WOLF POINT TO 22 MILES NORTHEAST OF CIRCLE...MOVING
  NORTH AT 15 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  VIDA BY 220 AM MDT

LARGE HAIL...DAMAGING WINDS...AND HEAVY RAINFALL ARE LIKELY WITH THIS
STORM. TAKE COVER IN A STURDY BUILDING UNTIL THE STORM HAS PASSED.

LAT...LON 4807 10521 4807 10564 4800 10613 4806 10641
          4796 10644 4786 10628 4736 10629 4718 10617
          4718 10597 4710 10596 4710 10584 4719 10583
          4719 10542 4779 10536

.END 

79

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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 5, 8:40 PM MDT, 5 hours 9 minutes earlier.

Area forecast discussion, Jul 5, 8:40 PM MDT, 5 hours 9 minutes before

NORTHEAST MONTANA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
840 PM MDT WED JUL 5 2000

UNSEASONABLY DEEP UPR TROF ALONG WEST COAST TO PERSIST THROUGH AT
LEAST THE NEXT SEVERAL DAYS. S/WS EJECTING OUT OF TROF ACRS MT WILL
PROVIDE TRIGGERS FOR CONVECTION.

ATTM...ANOTHER ACTIVE CONVECTIVE EVENT IN PROGRESS. NEWEST CLUSTER
OF CELLS DEVELOPING OVER PETROLEUM AND WESTERN GARFIELD COUNTY. NEW
ETA CONSISTENT IN DEVELOPING A CONVECTIVE COMPLEX OVER CENTRAL MT
THIS EVENING...MOVING SLOWLY NE INTO NEMONT AND SASK OVERNIGHT. THIS
APPEARS A POSSIBILITY WITH MORE CONVECTION TOWARDS KGTF. WITH LEE
CYCLOGENESIS...LOW LEVEL JET ADVECTIVE MOISTURE AND A FAVORABLE
SHEAR PROFILE THE ETA MAY VERIFY.

THURSDAY LOOKS TO BE ANOTHER VERY ACTIVE THUNDERSTORM DAY. SWLY FLOW
INDUCED SFC LOW IN SE MONT ALONG WITH SFC CONVERGENCE...STG ELY
FLOW...MOIST LOW LEVEL ATMOSPHERE...AND AN UPR LVL TRIGGER ALL SPELL
TROUBLE.  ETA INDICATED CAPES APCH 4400 J/KG OVR EXTRM NEMONT AND
LIS OF -13 WITH A NICELY SHEARED WIND PROFILE.

AVN/ETA INDICATING QUIETER CONDS ON FRIDAY WITH DRIER WITH A MINOR
RIDGE ALOFT AND DRIER WESTRLY FLOW IN THE LOW LEVELS. PETRESCU

WILL UPDATE AS NECCESARY TO KEEP UP WITH CURRENT TSTM CONDITIONS.

EXTENDED...MODELS IN GUD AGREEMENT INTO DAY THREE AND FOUR WITH
UPPER TROF OVER PAC COAST KEEPING NEMONT IN MOIST UNSTABLE SW FLOW.
SOUTHWEST FLOW CONTINUES WITH CHANGE IN THE PATTERN BY THE END OF
THE EXTENDED. WILL KEEP TEMPS ON THE WARM SIDE AND THE CONTINUING
CHANCE FOR THUNDERSTORMS. TEMPS MAY BE A TAD COOLER ON MONDAY. KPB

GGW TBTTT 059/085 056/085 058/090 058/086 055/085 916761/75366
GDV TBTTT 061/088 058/085 059/089 059/087 057/087 916771/75366

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:05 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	55 min
Jul 5, 6:19 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	56 min
Jul 5, 6:28 PM MDT	Severe Thunderstorm Warning	GGW	McCone	62 min
Jul 5, 7:11 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	64 min
Jul 5, 7:25 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum	65 min
Jul 5, 8:01 PM MDT	Severe Thunderstorm Warning	GGW	Valley	59 min
Jul 5, 8:14 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	61 min
Jul 5, 8:28 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum	62 min
Jul 5, 9:11 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	64 min
Jul 5, 9:16 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	59 min
Jul 5, 10:09 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	66 min
Jul 5, 10:13 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	62 min
Jul 5, 10:53 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	67 min
Jul 6, 12:35 AM MDT	Severe Thunderstorm Warning	GGW	Dawson	55 min
Jul 6, 12:49 AM MDT	Severe Thunderstorm Warning	GGW	McCone	56 min
Jul 6, 1:30 AM MDT	Severe Thunderstorm Warning	GGW	Dawson	60 min
Jul 6, 2:25 AM MDT	Severe Thunderstorm Warning	GGW	Valley	65 min

Nearby

Severe Thunderstorm Warnings in Montana, 2000 Every severe thunderstorm warning in 2000

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.