Alert archive / Montana / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 583

July 14, 20007 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 14, 2000, 5:30 PM MDT for 7 counties in Montana. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 14, 2000, 5:30 PM MDT (23:30 UTC)
Expired
Jul 15, 2000, 12:00 AM MDT
In force
7 hr
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Fergus County, MT, Garfield County, MT, Judith Basin County, MT, Petroleum County, MT, Phillips County, MT, Valley County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.5 hours before the alert went out and 139 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, Great_falls, MT at 12:00Z on 2000-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 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, Great_falls, MT at 12:00Z on 2000-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -78 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
58 J/kg
Mixed-layer CIN
-415 J/kg
Mixed-layer LCL
2712 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-78 m²/s²
0-3 km storm-relative helicity
-10 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.

039 
WWUS9 KMKC 142251
SEL3  
MKC WW 142246
MTZ000-150600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 583
STORM PREDICTION CENTER NORMAN OK
446 PM MDT FRI JUL 14 2000

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

   NORTH CENTRAL MONTANA                            

EFFECTIVE THIS FRIDAY NIGHT FROM 530 PM UNTIL MIDNIGHT MDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 95 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF LEWISTOWN
MONTANA TO 75 MILES NORTHWEST OF GLASGOW 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 577...WW 579...WW
580...WW 581...WW 582...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO CONTINUE TO INCREASE
ACROSS PORTIONS OF NORTH CENTRAL MT AS UPPER TROUGH APPROACHES FROM
THE WEST.  STRONG MID/UPPER LEVEL WINDS AND CAPE VALUES OVER 2000
J/KG SHOULD AID POTENTIAL FOR DAMAGING WINDS AND LARGE HAIL IN
STRONGER CELLS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 25030.


...HART

465,1104 485,1095 485,1054 465,1064

Nearby

Severe Thunderstorm Watches in Montana, 2000Every severe thunderstorm watch in 2000

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.