Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 39, NWS Glasgow, MT

July 1, 2001Dawson County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 1, 2001, 3:01 PM MDT for Dawson County, Montana. It was in force for 59 min. 1 report 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
Jul 1, 2001, 3:01 PM MDT (21:01 UTC)
Expired
Jul 1, 2001, 4:00 PM MDT
In force
59 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Dawson County, MT

What was reported inside it

TimeReportWhereRemark
Jul 1, 3:10 PM MDTHail 0.75Bloomfield, MT

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 nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 9.0 hours before the alert went out and 166 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 2001-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2001-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
925 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
302 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 012101
SVRGGW

MTC021-012200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
301 PM MDT SUN JUL 1 2001

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DAWSON COUNTY IN NORTHEAST MONTANA

* UNTIL 400 PM MDT

* AT 256 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 18 MILES NORTHWEST OF INTAKE...OR ABmOUT 25
  MILES NORTH OF GLENDIVE...MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  INTAKE BY 335 PM MDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.

.END
95

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 1, 2:58 PM MDT, 3 minutes earlier.

Area forecast discussion, Jul 1, 2:58 PM MDT, 3 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
258 PM MDT SUN JUL 1 2001

...WILL ALLOW LAKE WIND ADVISORY TO EXPIRE FOR FORT PECK LAKE...

SEVERE TSTORMS IN PROGRESS OVER MCCONE AND DAWSON COUNTIES MOVING
SE. ASSOCIATED WITH STRONG VORT MAX CROSSING W CONUS RIDGE...RIDGE
AXIS OVER CNTRL MT. NO EVIDENCE OF ANY SIGNIFICANT FEATURES
IMMEDIATELY UPSTREAM...BUT VORT OVER OREGON EJECTING FROM MAIN TROF
OVER NE PAC WITH SW FLOW OVER PAC NW INTO NW MT. ETA CARRIES THIS
FEATURE ACROSS S AND CNTRL MT OVERNIGHT...PLUS SHOWS SIGNS OF
WEAKENING FURTHER... WILL DISCOUNT FOR ALL BUT S ZONES. ETA
GRADUALLY RETROGRADES W CONUS RIDGE TO IDAHO BY END OF PD...ALLOWING
FLOW OVER NEMONT TO TURN MORE NW/LY. WK VORT MAX PROGGED TO CROSS
NEMONT MIDDAY TUES...CURRENTLY LOOKS QUITE WK AND PROGGED TO DAMP
OUT...WILL CARRY PTLY CLOUDY BUT NOT INCLUDE MENTION OF PRECIP. HI
PRESSURE PROGGED TO BUILD SE FROM SASK WITH SLIGHT THICKNESS
DECREASE EVIDENT TUESDAY IN ETA...IN LINE WITH FWC MOS GUIDANCE.
THIS SOLN LOOKS REASONABLE...WILL STAY CLOSE TO MOS TEMPS.

EXTENDED...W CONUS TROF PROGGED TO RETROGRADE AS CENTRAL NOAM LOW
DIGS INTO GT LAKES...AMPLIFYING FLOW AND BRINGING MORE NW FLOW TO
NEMONT BEFORE LOW BEGINS TO SHIFT INTO ST LAWRENCE VALLEY BY LATE IN
WK. AFTER INITIAL COOLING EARLY IN PD...GRADUAL WARMING AND DRY...
ALTHOUGH NW FLOW THIS TIME OF YEAR ALWAYS CARRIES POTENTIAL FOR
ISOLD CONVECTION. WILL KEEP FCST DRY...ESP AFTER READING NCEP
DISCUSSION ADVISING SLOWER PROGRESSION OF PATTERN.  SECORA

KGGW 055/087 055/084 049/084 053/088 057/085 057/087 055/087
      BBBUUUU  861101/8611111
KGDV 055/085 055/085 051/0M85 054/088 055/085 057/086 057/088
      BBBUUUV  864101/8611111

In the hours before

Local storm report, Jul 1, 2:36 PM MDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
236 PM MDT SUN JUL 1 2001

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

1241 PM    VIDA                      MT   .88 INCH HAIL
07/01/01   MCCONE

0136 PM    11 NW VIDA                MT   .75 INCH HAIL
07/01/01   MCCONE

0100 PM    13 NW VIDA                MT   1.75 INCH HAIL
07/01/01   MCCONE                         CROPS FLATTENED

1132 AM    NASHUA                    MT   .88 INCH HAIL
07/01/01   VALLEY

0110 PM    2 S FRAZER                MT   .75 INCH HAIL
07/01/01   VALLEY

0205 PM    VIDA                      MT   .88 INCH HAIL
07/01/01   MCCONE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 7:57 AM MDTSevere Thunderstorm WarningGGWPhillips63 min
Jul 1, 11:37 AM MDTSevere Thunderstorm WarningGGWRoosevelt, Valley53 min
Jul 1, 11:58 AM MDTSevere Thunderstorm WarningGGWMcCone, Roosevelt, Valley32 min
Jul 1, 12:30 PM MDTSevere Thunderstorm WarningGGWMcCone30 min
Jul 1, 12:34 PM MDTSevere Thunderstorm WarningGGWValley26 min
Jul 1, 12:51 PM MDTSevere Thunderstorm WarningGGWMcCone54 min
Jul 1, 12:56 PM MDTSevere Thunderstorm WarningGGWValley64 min
Jul 1, 1:41 PM MDTSevere Thunderstorm WarningGGWMcCone64 min
Jul 1, 2:04 PM MDTSevere Thunderstorm WarningGGWDawson56 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001

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.