Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 39, NWS Glasgow, MT

June 29, 2002Prairie County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 29, 2002, 4:43 PM MDT for Prairie County, Montana. It was in force for 62 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 29, 2002, 4:43 PM MDT (22:43 UTC)
Expired
Jun 29, 2002, 5:45 PM MDT
In force
62 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Prairie County, MT

The radar

The Glasgow radar (KGGW), 176 km from the middle of the area, began a volume at 22:46 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.

What was reported inside it

TimeReportWhereRemark
Jun 29, 4:50 PM MDTThunderstorm Wind 52 MTerry, MT60 mph wind reported at Big Sheep RAWS.
Jun 29, 5:15 PM MDTThunderstorm Wind 52 MTerry, MT60 mph wind toppled 12 inch diameter pine tree at Terry.

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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 29, 2:00 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.7 hours before the alert went out and 177 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-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 12:00Z on 2002-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 80 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 12:00Z on 2002-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
80 J/kg
Mixed-layer CIN
-468 J/kg
Mixed-layer LCL
2641 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KGGW 292243
SVRGGW
MTC079-292345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
443 PM MDT SAT JUN 29 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

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

* UNTIL 545 PM MDT

* AT 441 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 20 MILES NORTH OF MCCLOUD TO 15
  MILES WEST OF MCCLOUD...OR FROM 19 MILES SOUTH OF CIRCLE TO 28
  MILES WEST OF TERRY...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MCCLOUD BY 515 PM MDT

STRONG AND DAMAGING WINDS ARE LIKELY WITH THIS STORM. TAKE COVER IN A
SUBSTANTIAL SHELTER UNTIL THE STORM PASSES.

.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 Jun 29, 2:33 PM MDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jun 29, 2:33 PM MDT, 2 hours 10 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
230 PM MDT SAT JUN 29 2002

.SHORT TERM...A 120 KT JET PUNCHING INTO WESTERN MONTANA THIS
AFTERNOON WILL DRIVE A COLD FRONT INTO EASTERN MONTANA THIS EVENING.
AIR MASS AHEAD OF THIS FEATURE IS MODERATELY UNSTABLE. STRONG/SEVERE
THUNDERSTORMS OVER CENTRAL MONTANA WILL SPREAD EAST AHEAD OF THE
FRONT THIS AFTERNOON/TONIGHT. MAIN THREAT SHOULD BE DAMAGING WINDS
AHEAD OF THE FRONT WITH ISOLATED AREAS OF LARGE HAIL ALSO POSSIBLE.
THE AIR MASS DRIES OUT QUICKLY BEHIND THE FRONT TONIGHT WITH DRY AND
COOLER CONDITIONS IN STORE FOR SUNDAY. THE ETA BRINGS ANOTHER WAVE
ALONG THE CANADIAN BORDER SUNDAY NIGHT WITH WEAK LOW PRESSURE
DEVELOPING OVER SOUTHEAST MONTANA. WILL ADD 20 POPS TO COVER
THIS...OTHERWISE DRY CONDITIONS WILL PREVAIL THROUGH TUESDAY.

.LONG TERM...AN UPPER LEVEL RIDGE MOVES OVER THE AREA WEDNESDAY TO
CONTINUE DRY CONDITIONS. SOUTHWEST FLOW RETURNS THE FOURTH OF JULY
FOR CHANCE POPS DAYS 5-7. TEMPERATURES WILL WARM WEDNESDAY AND THE
FOURTH...THEN COOL OFF FRIDAY AND SATURDAY AS A COLD FRONT MOVES
THROUGH THE AREA LATE THURSDAY.  WATERHOUSE

KGGW BBB 058/082 055/080 053/080 99612000
     BTTT 056/083 059/086 060/081 054/081 9912333333
KGDV BBB 061/085 057/083 054/083 99612000
     BTTT 057/085 060/087 060/083 054/083 9912333333

.GGW...NONE

In the hours before

Local storm report, Jun 29, 3:13 PM MDT, 1 hour 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
313 PM MDT SAT JUN 29 2002

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1140 PM    15 S CONTENT              MT   60 MPH TSTM WIND GUST
06/28/02   PHILLIPS

1140 PM    15 S CONTENT              MT   WIND DAMAGE
06/28/02   PHILLIPS                       ROOF BLOWN OFF BARN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 11:13 PM MDTSevere Thunderstorm WarningGGWPhillips62 min
Jun 28, 11:54 PM MDTSevere Thunderstorm WarningGGWValley51 min
Jun 29, 3:13 PM MDTSevere Thunderstorm WarningGGWPhillips, Valley62 min
Jun 29, 3:50 PM MDTSevere Thunderstorm WarningGGWMcCone55 min
Jun 29, 4:04 PM MDTSevere Thunderstorm WarningGGWMcCone41 min
Jun 29, 4:07 PM MDTSevere Thunderstorm WarningGGWRoosevelt53 min
Jun 29, 4:15 PM MDTSevere Thunderstorm WarningGGWDaniels, Valley60 min
Jun 29, 4:49 PM MDTSevere Thunderstorm WarningGGWMcCone56 min
Jun 29, 4:53 PM MDTSevere Thunderstorm WarningGGWDawson, Richland67 min
Jun 29, 5:02 PM MDTSevere Thunderstorm WarningGGWRoosevelt58 min
Jun 29, 5:54 PM MDTSevere Thunderstorm WarningGGWDaniels66 min
Jun 29, 5:56 PM MDTSevere Thunderstorm WarningGGWRichland, Wibaux64 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning in 2002

Sources

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.