Alert archive / Montana / Tornado Warnings in 2010

Tornado Warning 1, NWS Glasgow, MT

May 27, 2010McCone County, Prairie County, Montana

NWS Glasgow, MT issued this tornado warning at May 27, 2010, 9:01 PM MDT for McCone County, Prairie County, Montana. It was in force for 59 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
May 27, 2010, 9:01 PM MDT (03:01 UTC)
Expired
May 27, 2010, 10:00 PM MDT
In force
59 min
Issued by
NWS Glasgow, MT
Area
Storm-based polygon

Counties McCone County, MT, Prairie County, MT

The radar

The Glasgow radar (KGGW), 131 km from the middle of the area, began a volume at 03:04 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 watch it was issued in

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

IssuedProductOfficeLasted
May 27, 4:39 PM MDTTornado WatchSPC8 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.0 hours before the alert went out and 132 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 00:00Z on 2010-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 132 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 00:00Z on 2010-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 297 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
132 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
587 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
297 m²/s²
0-3 km storm-relative helicity
346 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at May 27, 5:49 PM MDT, 3 hours 12 minutes earlier.

Area forecast discussion, May 27, 5:49 PM MDT, 3 hours 12 minutes before
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Hazardous weather outlook, May 27, 10:07 AM MDT, 10 hours 54 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
1007 AM MDT THU MAY 27 2010

MTZ016>027-059>062-281200-
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-
1007 AM MDT THU MAY 27 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL AFFECT NORTHEAST MONTANA
POSSIBLY THIS AFTERNOON BUT MORE LIKELY TONIGHT. SOME OF THESE
STORMS WILL BECOME SEVERE WITH LARGE HAIL...DAMAGING WINDS AND
POSSIBLY ISOLATED TORNADOES. HEAVY RAINFALL IS ALSO POSSIBLE.
WITH MANY SMALL STREAMS NEAR BANKFULL AND GROUND SATURATED FROM
RECENT RAINS...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR TONIGHT FOR
NORTHEAST MONTANA ROUGHLY EAST OF SACO TO COHAGEN LINE.

A LAKE WIND ADVISORY IS IN EFFECT FOR FORT PECK LAKE THROUGH 9 PM
THIS EVENING. LOOK FOR EAST WINDS 20 TO 30 MPH WITH GUSTS TO 40
MPH OVER FORT PECK LAKE TODAY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON FRIDAY NEAR THE
NORTH DAKOTA BORDER.

COLD AIR WILL IMPACT NORTHEAST MONTANA FOR THE MEMORIAL DAY
WEEKEND. MORE RAIN IS LIKELY SATURDAY AND SATURDAY NIGHT.
TEMPERATURES WILL BE COLD ENOUGH SATURDAY NIGHT AND SUNDAY MORNING
THAT A MIX OF RAIN AND SNOW IS POSSIBLE NORTH OF THE MISSOURI
RIVER.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, May 27, 6:39 PM MDT, 2 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
639 PM MDT THU MAY 27 2010

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

0725 PM     HAIL             12 NNE MCCLOUD          47.06N 105.47W
05/26/2010  E0.75 INCH       PRAIRIE            MT   TRAINED SPOTTER

            PENNY SIZED HAIL COVERED THE GROUND.

&&

RSMITH
Special weather statement, May 27, 8:35 PM MDT, 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
835 PM MDT THU MAY 27 2010

MTZ019-280315-
SHERIDAN-
835 PM MDT THU MAY 27 2010

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHERN SHERIDAN COUNTY IN NORTHEAST MONTANA...

UNTIL 915 PM MDT.

AT 832 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR PORT OF RAYMOND...MOVING NORTH AT 25 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN.

LOCATIONS IN THE ADVISORY INCLUDE...
  RURAL AREAS OF NORTHERN SHERIDAN COUNTY...

LAT...LON 4900 10434 4889 10450 4891 10472 4901 10465
      4901 10434
TIME...MOT...LOC 0233Z 194DEG 23KT 4897 10458

SIMONSEN

WEATHER.GOV/GLASGOW

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 8:34 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Prairie26 min
May 27, 8:35 PM MDTSpecial Weather StatementGGWSheridan40 min
May 27, 8:45 PM MDTSevere Thunderstorm WarningGGWSheridan30 min
May 27, 8:58 PM MDTSevere Thunderstorm WarningGGWMcCone, Prairie47 min
May 27, 9:25 PM MDTTornado WarningGGWDawson, McCone, Prairie50 min
May 27, 9:29 PM MDTSevere Thunderstorm WarningGGWMcCone61 min
May 27, 9:57 PM MDTSevere Thunderstorm WarningGGWGarfield23 min
May 27, 10:14 PM MDTTornado WarningGGWDawson, Richland31 min
May 27, 10:27 PM MDTSevere Thunderstorm WarningGGWGarfield63 min
May 27, 10:43 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Valley62 min
May 27, 10:47 PM MDTTornado WarningGGWGarfield28 min
May 27, 10:55 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone64 min
May 27, 11:17 PM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Valley58 min
May 27, 11:42 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Roosevelt63 min
May 27, 11:44 PM MDTSpecial Weather StatementGGWDaniels61 min
May 28, 12:40 AM MDTSevere Thunderstorm WarningGGWMcCone, Roosevelt, Valley65 min
May 28, 1:05 AM MDTSevere Thunderstorm WarningGGWDawson, McCone, Richland, Roosevelt55 min
May 28, 1:18 AM MDTSevere Thunderstorm WarningGGWDaniels, McCone, Roosevelt, Sheridan57 min
May 28, 1:51 AM MDTSpecial Weather StatementGGWRoosevelt, Sheridan54 min
May 28, 2:06 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan39 min
May 28, 2:40 AM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan50 min
May 28, 6:03 AM MDTDense Fog AdvisoryGGWDawson, Prairie, Richland, Wibaux4 hr
May 28, 10:04 AM MDTFlash Flood WatchGGWDaniels, Dawson, McCone, Prairie, Richland, Roosevelt and 3 more18 hr

Nearby

Tornado Warnings in Montana, 2010Every tornado warning in 2010Tornadoes in 2010

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.