Alert archive / Idaho / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 31, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 4, 1997, 1:21 PM PDT for Idaho County, Idaho. It was in force for 54 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
- Aug 4, 1997, 1:21 PM PDT (20:21 UTC)
- Expired
- Aug 4, 1997, 2:15 PM PDT
- In force
- 54 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Idaho County, ID
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 8.4 hours before the alert went out and 218 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.
- Mixed-layer CAPE
- 6 J/kg
- Mixed-layer CIN
- -565 J/kg
- Mixed-layer LCL
- 3067 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSO 042026 RRA SVRMSO IDC049-042115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 221 PM MDT (121 PM PDT) MON AUG 4 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 PM MDT (215 PM PDT) FOR PEOPLE IN THE FOLLOWING LOCATION... IN CENTRAL IDAHO ...SOUTHEASTERN IDAHO COUNTY AT 120 PM PDT...RADAR INDICATES A SEVERE THUNDERSTORM IN SOUTHEAST IDAHO COUNTY ABOUT 8 MILES EAST-SOUTHEAST OF DIXIE MOVING NORTH AT 20 MILES MPH OVER THE SALMON RIVER. THIS STORM IS CAPABLE OF PRODUCING HAIL IN EXCESS OF 3/4 INCH...GUSTY WINDS TO 55 MPH AND LOCALLY HEAVY RAIN. IF YOU ARE CAUGHT OUTSIDE...SEE8K SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 12:47 PM PDT, 34 minutes earlier.
Area forecast discussion, Aug 4, 12:47 PM PDT, 34 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT MON AUG 4 1997 STILL NOT FOND OF MODELS HANDLING OF UPPER LOW IN UT/SOUTHERN ID BUT AVAILABLE MOISTURE IS UNQUESTIONED. BEST EVIDENCE OF A STRONG VORT LIES IN A LOOP OF RADAR REFLECTIVITY AT PIH WITH A COMMA SIGNATURE BUT IS BECOMING DIFFUSE. LOW MOVING NORTH INTO WEST CENTRAL UT STILL LOOK STRONGER AND DO NOT KNOW WHICH WILL BE THE DOMINANT CENTER. BIGGER PICTURE...UPPER RIDGE OVER US TO BUILD WHILE THE LOW GETS HUNG UP WITHIN. HIGH CENTER IN NEW MEXICO TO RETROGRADE TO OFFSHORE LOCATION BY 48 HOURS WHILE THE LOW NEAR 48N/140W RETROGRADES FOR 24 HOURS THEN SWINGS BACK EAST. WILL ACCEPT THAT MUCH FROM MODELS AND IMPLIES HOT WILL CONTINUE UNTIL THE SHORTWAVE POSSIBLY DROPPING IN FROM NORTHWEST ON FRI IS RESOLVED. FIGURE THE UT LOW WILL REACH EASTERN ID/SOUTHWEST MT AS MODELS SHOW BUT PREFER AVN SOLUTION BEYOND 30 HOURS...WITH PERHAPS A PIECE OF THE LOW BEING DRAWN SOUTHEAST VS. THE WHOLE THING. SO NGM IS DROPPING POPS TOO QUICKLY AND WILL TREND TOWARD THE AVN HERE. WILL NOT RAISE POPS QUITE AS HIGH AS AVN EXCEPT AT BTM BECAUSE LOW LEVEL CONVERGENCE LOOKS WEAK. ALSO HAVING TROUBLE BELIEVING SIGNIFICANT MOISTURE WILL REACH FCA...ESPECIALLY TONIGHT FOR THE AVN 50 PCT POPS THERE...BUT THE INSTABILITY THERE FOR THE NEXT 72 HOURS IS SCARY WITH -6 LIFTED INDEX EACH DAY AND GOOD CAPES TO START. AVN TEMPS LOOKS RAIN COOLED AND OVERDONE...WILL COMPROMISE HERE WITH MOS HERE. GV ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 057/089 053/092 ... 351222 FCA BB 057/087 054/091 054 351342 POL .. 061/087 057/088 ... 352342 MSO WB 062/085 058/087 056 355553 HMM .. 062/083 058/085 ... 356554 BTM .. 052/075 050/079 ... 357654 S80 .. 058/085 060/087 ... 352332 P69 .. 061/087 060/090 ... 353432 SMN .. 058/076 058/079 ... 356654
Nearby
Severe Thunderstorm Warnings in Idaho, 1997Every severe thunderstorm warning in 1997
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.