Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 112, NWS Glasgow, MT

July 26, 2011Garfield County, Petroleum County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 26, 2011, 2:18 PM MDT for Garfield County, Petroleum County, Montana. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 26, 2011, 2:18 PM MDT (20:18 UTC)
Expired: Jul 26, 2011, 3:15 PM MDT
In force: 57 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

Counties Garfield County, MT, Petroleum County, MT

The radar

The Glasgow radar (KGGW), 135 km from the middle of the area, began a volume at 20:18 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.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.3 hours before the alert went out and 137 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 0 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -88 m²/s²
0-3 km storm-relative helicity: -31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

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 26, 10:20 AM MDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jul 26, 10:20 AM MDT, 3 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1020 AM MDT TUE JUL 26 2011

.SHORT TERM...FOR NORTHEAST MONTANA...TODAY THROUGH THURSDAY...
UPDATE TO LOWER POPS FOR THE WESTERN AND CENTRAL ZONES. ALSO
LOWERED TEMPS A TAD FOR THE NW AND RAISED THEM FOR THE SE. TWEAKED
WINDS TOO TOWARD ADJMET GUIDANCE. REST OF FORECAST LOOKED GOOD.
JAMBA

PREVIOUS DISCUSSION...
A SHALLOW UPPER LEVEL TROUGH HAS DEVELOPED OVER THE WESTERN STATES
THAT WILL CONTINUE IN PLACE THROUGH THE SHORT TERM PERIOD. A
SHORTWAVE DISTURBANCE IN THE UPPER FLOW WILL LIFT NORTHEAST INTO
ALBERTA AND SASKATCHEWAN TODAY. THIS WILL MAINTAIN AN UPPER JET
AIMED AT SURFACE TROUGH/FRONTAL BOUNDARY IN WESTERN NORTH DAKOTA.
BOTH NAM AND GFS PLACE THE HEAVY QPF EAST OF THE STATE BORDER BUT
KEEP SOME LIGHTER QPF FOR NORTHEAST MONTANA. WITH SURFACE BASED
CAPE OVER 2000 J/KG AND LIFTED INDEX OF -8C EXPECT THIS ACTIVITY
TO BECOME SEVERE IN NORTH DAKOTA AND OUR NORTHEAST CORNER. SO COULD
SEE ENERGETIC THUNDERSTORMS LATE THIS AFTERNOON OR EVENING.
OTHERWISE KEPT SLIGHT CHANCE POPS IN FOR TODAY ELSEWHERE. THE SPC
CONVECTIVE OUTLOOK FOR TODAY INCLUDES OUR NORTHEAST ZONES FOR
POSSIBLE SEVERE THUNDERSTORMS.

TONIGHT FLOW ALOFT BECOMES NEARLY ZONAL AS SEVERAL WEAK SHORTWAVES
ROTATE THROUGH WESTERN CANADA. THIS COULD SEND WEAK DISTURBANCES
ACROSS NEMONT THROUGH WEDNESDAY NIGHT. THEN GFS PICKS UP A WEAK
UPPER RIDGE FOR THURSDAY WHICH WILL CAUSE FLOW ALOFT TO BECOME
SLIGHTLY NORTHWESTERLY. THAT COULD SUPPRESS THUNDERSTORMS FROM
DEVELOPING.

THE MAIN EFFECT OF THE SHALLOW TROUGH WILL BE TO KEEP NEMONT ON
THE NORTH SIDE OF THE FLUCTUATING TEMPERATURE BOUNDARY...THUS
KEEPING TEMPERATURES CLOSE TO NORMAL. SCT

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...
THE EXTENDED BEGINS WITH ZONAL FLOW ALOFT ACROSS NORTHEAST
MONTANA. THE CENTER OF THE UPPER RIDGE OVER THE SOUTHEASTERN CONUS
BEGINS TO SLIDE WEST DURING THE UPCOMING WEEKEND. BY MONDAY
AFTERNOON THE CENTER OF THAT RIDGE WILL BE OVER WEST TEXAS AND THE
FRONT RANGE OF THE CENTRAL ROCKIES AS PER THE GFS SOLUTION.

GOING TO BE EXTRA CAREFUL ON BUYING THE GFS WITH THE EC AND GEM
SHOWING SOME CANADIAN PACIFIC SHORTWAVES KEEPING A CHANCE OF
THUNDERSTORMS IN THE FORECAST...WHEREAS THE GFS IS A BIT MORE
STRONGER ON THE RIDGE WHICH WOULD LEAD TO A DRIER FORECAST. THE
GFS IS ALSO STRUGGLING WITH UPPER LEVEL PATTERNS OVER THE NORTHERN
CANADIAN PRAIRIE PROVINCES WHICH IS SHOWING A RUN TO RUN
INCONSISTENCY ISSUE.

THE FORECAST TREND WILL BE FAIRLY DRY EARLY FOR MOST OF NORTHEAST
MONTANA...THEN TRANSITIONING TO CLIMO FOR THE REMAINDER UNTIL
BETTER MODEL AGREEMENT AND STABILITY CAN LEAD TO A HIGHER
CONFIDENCE TO NUDGE DRY OR WET WITH THE EXTENDED.           PROTON

&&

.AVIATION...
VFR FROM NOON ONWARD. SCATTERED MORNING THUNDERSTORM ACTIVITY WILL
COULD LEAD TO POCKETS OF MVFR/IFR AND BRIEF... STRONG... ERRATIC
WINDS. MAJORITY OF STORMS SHOULD EXIT TO THE NORTH AND EAST AROUND
OR JUST AFTER NOON. A FEW ISOLATED SHOWERS MAY BE LEFT AROUND KSDY
OR EAST AND NORTH OF KOLF IN THE EARLY AFTERNOON. WINDS WILL BE
OUT WEST FROM 10 TO 15 KTS THROUGH THE AFTERNOON AND BECOMING
LIGHTER AROUND 5 TO 10 KTS OVERNIGHT. GAH

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

WEATHER.GOV/GLASGOW

Hazardous weather outlook, Jul 26, 3:07 AM MDT, 11 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
307 AM MDT TUE JUL 26 2011

MTZ016>027-059>062-271100-
CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-
DANIELS-SHERIDAN-WESTERN ROOSEVELT-PETROLEUM-GARFIELD-MCCONE-
RICHLAND-DAWSON-PRAIRIE-WIBAUX-NORTHERN PHILLIPS-
SOUTHWEST PHILLIPS-NORTHERN VALLEY-EASTERN ROOSEVELT-
307 AM MDT TUE JUL 26 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT MOVING ACROSS THE AREA TODAY WILL BRING ANOTHER ROUND
OF THUNDERSTORMS. SOME STORMS MAY BECOME SEVERE IN THE AFTERNOON
WITH LARGE HAIL AND STRONG WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Special weather statement, Jul 26, 1:10 PM MDT, 1 hour 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
110 PM MDT TUE JUL 26 2011

MTZ016-017-262015-
PHILLIPS-VALLEY-
110 PM MDT TUE JUL 26 2011

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  WESTERN VALLEY COUNTY IN NORTHEAST MONTANA...
  EASTERN PHILLIPS COUNTY IN NORTHEAST MONTANA...

UNTIL 215 PM MDT.

AT 106 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 19 MILES SOUTHEAST OF MALTA...MOVING NORTHEAST AT
45 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.

LOCATIONS IN THE ADVISORY INCLUDE...
   SACO...
   HINSDALE...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4818 10690 4802 10762 4826 10779 4857 10729
      4857 10712
TIME...MOT...LOC 1910Z 241DEG 38KT 4817 10755

MICKELSON
WEATHER.GOV/GLASGOW

Local storm report, Jul 26, 2:02 PM MDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
202 PM MDT TUE JUL 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0157 PM     TSTM WND GST     SSW TAMPICO             48.30N 106.83W
07/26/2011  E60 MPH          VALLEY             MT   TRAINED SPOTTER

&&

METZGER

Special weather statement, Jul 26, 2:03 PM MDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
203 PM MDT TUE JUL 26 2011

MTZ021-262100-
PETROLEUM-
203 PM MDT TUE JUL 26 2011

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHERN PETROLEUM COUNTY IN NORTHEAST MONTANA...

UNTIL 300 PM MDT.

AT 157 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES WEST OF FLATWILLOW...MOVING EAST AT 25
MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM.

LOCATIONS IN THE ADVISORY INCLUDE...
   FLATWILLOW...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4685 10862 4696 10862 4684 10787 4675 10791
      4674 10850 4674 10856 4677 10864 4683 10864
TIME...MOT...LOC 2003Z 287DEG 20KT 4685 10858

TFJ
WEATHER.GOV/GLASGOW

Local storm report, Jul 26, 2:11 PM MDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
211 PM MDT TUE JUL 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0210 PM     TSTM WND GST     GLASGOW                 48.20N 106.64W
07/26/2011  M62 MPH          VALLEY             MT   ASOS

&&

METZGER

Local storm report, Jul 26, 2:18 PM MDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
218 PM MDT TUE JUL 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0214 PM     HAIL             3 N FLATWILLOW          46.87N 108.39W
07/26/2011  E1.25 INCH       PETROLEUM          MT   TRAINED SPOTTER

&&

JB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:19 PM MDT	Special Weather Statement	GGW	Phillips	56 min
Jul 25, 7:31 PM MDT	Special Weather Statement	GGW	Phillips	59 min
Jul 25, 7:37 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Phillips, Valley	68 min
Jul 25, 8:00 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	60 min
Jul 25, 8:42 PM MDT	Special Weather Statement	GGW	Valley	63 min
Jul 25, 8:51 PM MDT	Tornado Warning	GGW	Garfield	24 min
Jul 25, 9:11 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone	64 min
Jul 25, 11:45 PM MDT	Special Weather Statement	GGW	Garfield	60 min
Jul 26, 12:14 AM MDT	Special Weather Statement	GGW	Valley	61 min
Jul 26, 1:18 AM MDT	Special Weather Statement	GGW	Valley	57 min
Jul 26, 6:28 AM MDT	Special Weather Statement	GGW		62 min
Jul 26, 1:10 PM MDT	Special Weather Statement	GGW	Phillips	65 min
Jul 26, 1:28 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	34 min
Jul 26, 1:50 PM MDT	Severe Thunderstorm Warning	GGW	Valley	55 min
Jul 26, 2:03 PM MDT	Special Weather Statement	GGW	Petroleum	57 min
Jul 26, 2:27 PM MDT	Severe Thunderstorm Warning	GGW	Valley	31 min
Jul 26, 3:11 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum	36 min
Jul 26, 3:24 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan	66 min
Jul 26, 3:50 PM MDT	Special Weather Statement	GGW	Petroleum	25 min
Jul 26, 3:54 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum, Phillips	66 min
Jul 26, 4:25 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt, Sheridan	55 min
Jul 26, 4:56 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Valley	64 min
Jul 26, 5:53 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone	37 min
Jul 26, 5:57 PM MDT	Special Weather Statement	GGW		33 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011 Every severe thunderstorm warning in 2011

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; radar from the NEXRAD Level II archive.