Alert archive / Montana / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 608

July 11, 20048 counties in Montana; Golden Valley County, North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2004, 8:40 PM MDT for 8 counties in Montana; Golden Valley County, North Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 11, 2004, 8:40 PM MDT (02:40 UTC)
Expired
Jul 12, 2004, 2:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Golden Valley County, ND

The radar

The Glasgow radar (KGGW), 118 km from the middle of the area, began a volume at 02:39 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.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 11, 8:41 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan64 min
Jul 11, 8:48 PM MDTSevere Thunderstorm WarningGGWMcCone57 min
Jul 11, 8:59 PM MDTSevere Thunderstorm WarningGGWRichland61 min
Jul 11, 9:03 PM MDTFlash Flood WarningGGWRichland, Roosevelt, Sheridan4 hr
Jul 11, 9:29 PM MDTTornado WarningGGWRichland61 min
Jul 11, 9:41 PM MDTSevere Thunderstorm WarningGGWRoosevelt49 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.7 hours before the alert went out and 117 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 2004-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1145 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 2004-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.19395878Sfc1 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
1145 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
2211 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 120237
SEL8  
SPC WW 120240
MTZ000-120800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 608
NWS STORM PREDICTION CENTER NORMAN OK
840 PM MDT SUN JUL 11 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       EASTERN MONTANA

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 840 PM UNTIL
200 AM MDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 75 MILES NORTH NORTHEAST OF WOLF
POINT MONTANA TO 35 MILES SOUTH SOUTHWEST OF GLENDIVE MONTANA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 605. WATCH NUMBER 605 WILL NOT BE
IN EFFECT AFTER 840 PM MDT. CONTINUE...WW 607...

DISCUSSION...SCATTERED STRONG/SEVERE STORMS CONTINUE ACROSS EASTERN
MT ALONG/AHEAD OF SURFACE FRONT.  ACTIVITY WILL LIKELY MAINTAIN
INTENSITY FOR ANOTHER FEW HOURS...WITH A RISK OF SUPERCELLS
PRODUCING LARGE HAIL AND DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.


...HART

490,1033 463,1034 463,1061 490,1061

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 11, 8:19 PM MDTMesoscale DiscussionSPCCuster, Daniels, Dawson, Fallon, Garfield, McCone and 9 more116 min
Jul 11, 10:34 PM MDTMesoscale DiscussionSPCRichland116 min
Jul 11, 6:20 PM MDTSevere Thunderstorm WatchSPCAdams, Billings, Bottineau, Bowman, Burke, Divide and 16 more8 hr
Jul 11, 10:50 PM MDTSevere Thunderstorm WatchSPCBarnes, Benson, Burleigh, Cavalier, Dickey, Eddy and 17 more6 hr
Jul 12, 12:29 AM MDTMesoscale DiscussionSPCBarnes, Benson, Bottineau, Burleigh, Cass, Cavalier and 28 more91 min
Jul 12, 12:55 AM MDTSevere Thunderstorm WatchSPCCass, Grand Forks, Ransom, Richland, Sargent, Steele and 1 more5 hr
Jul 12, 2:13 AM MDTMesoscale DiscussionSPCBarnes, Cass, Dickey, Emmons, Foster, Grand Forks and 14 more92 min
Jul 12, 3:53 AM MDTMesoscale DiscussionSPCCass, Richland, Traill67 min
Jul 12, 7:53 AM MDTMesoscale DiscussionSPCDickey, McIntosh, Sargent2 hr

Nearby

Severe Thunderstorm Watches in Montana, 2004Severe Thunderstorm Watches in North Dakota, 2004Every severe thunderstorm watch in 2004

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.