Alert archive / Idaho / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 22, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 20, 2001, 5:04 PM PDT for Idaho County, Idaho. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 20, 2001, 5:04 PM PDT (00:04 UTC)
- Expired
- Jul 20, 2001, 5:45 PM PDT
- In force
- 41 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Idaho County, ID
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.1 hours before the alert went out and 189 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
- 257 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 2144 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
914 WUUS55 KMSO 210004 SVRMSO IDC049-210045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 504 PM PDT FRI JUL 20 2001 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN IDAHO COUNTY IN CENTRAL IDAHO * UNTIL 545 PM PDT(645 PM MDT) * AT 504 PM PDT(604 PM MDT)...RADAR INDICATED A SEVERE THUNDERSTORM 14 MILES WEST OF GRANGEVILLE...MOVING NORTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE... 5 MILES NORTHWEST OF GRANGEVILLE AT 520 PM PDT 4 MILES SOUTHEAST OF KOOSKIA AT 545 PM PDT SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. LAT...LON 4594 11655 4579 11642 4607 11565 4628 11583
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 Jul 20, 1:00 PM PDT, 4 hours 4 minutes earlier.
Area forecast discussion, Jul 20, 1:00 PM PDT, 4 hours 4 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 200 PM MDT FRI JUL 20 2001 .SHORT TERM...WV SHOWS A LONG WAVE TROF OVER THE PACIFIC NORTHWEST WITH NUMBER OF S/WS ROTATING AROUND WITH THE FLOW. OF PARTICULAR INTEREST...IS A STRONG WAVE OVER CENTRAL OREGON WHICH IS PROGGED TO LIFT NORTHEAST BY SATURDAY MORNING. MESO IS VERY CONSISTENT WITH EARLIER RUNS THIS FEATURE. THIS AFTERNOONS CONVECTIVE ACTIVITY WILL CARRY INTO THE OVERNIGHT PERIOD WITH NEGATIVE LIS UNTIL AFTER MIDNIGHT. ADDITIONALLY..A FEW WEAK WAVES IN THE FLOW AND UPPER DIFFLUENCE WILL SUPPORT THIS ACTIVITY. ON SATURDAY...THE TROF AXIS REMAINS OVER EAST WASHINGTON AND OREGON WITH LIS OVER THE FORECAST AREA BETWEEN -2 AND -4. ANOTHER ACTIVE NIGHT AS THE MAIN S/W SHIFTS EAST. EARLY SUNDAY MORNING...THE UPPER FLOW SHIFTS WEST WITH CYCLONIC CURVATURE REMAINING OVER THE NORTHWEST ZONES. WILL GO WITH CHANCE POPS OVER THESE ZONES. SLIGHT CHANCE POPS FOR THE REST OF THE CWA AS S/W RIDGING BUILDS DURING THE DAY. STOLL .EXTENDED...NO REAL CHANGES TO FORECAST TREND. GRADUAL WARMING AND DRYING WILL BE ADVERTISED OVER THE COURSE OF THE FORECAST PERIOD. THE UPPER LEVEL TROUGH BEGINS TO FILL AS IT DRIFT EAST OVER THE NORTHERN ROCKIES REGION DAY3/4 FOR CHANCE POPS. THEN MODELS SUGGEST THAT THE UPPER FLOW BECOMES MORE ZONAL WITH RISING HEIGHTS FOR DECREASING POPS DAY5. BY DAY6/7...MODELS DIVERGE WITH ECMWF7 SHOWING RIDGING AND MRF INDICATING A TROUGH OVER THE REGION. WILL LEAN TOWARD WARM/DRIER ECMWF SOLUTION. MSJ .MSO...FLASH FLOOD WATCH FOR SOUTHERN RAVALLI COUNTY UNTIL MIDNIGHT.
In the hours before
Special weather statement, Jul 20, 12:30 PM PDT, 4 hours 34 minutes before
IDZ005>010-MTZ004>007-043-210600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 130 PM MDT FRI JUL 20 2001 ...STRONG THUNDERSTORMS WITH HEAVY RAIN AND HAIL POSSIBLE THIS AFTERNOON AND TONIGHT... DEVELOPING THUNDERSTORMS IN CENTRAL IDAHO THIS AFTERNOON AND MORE ACTIVITY IN WEST CENTRAL MONTANA WILL LIKELY PRODUCE LOCAL DOWNPOURS INTO THIS EVENING DUE TO HIGH ATMOSPHERIC MOISTURE CONTENT. HAIL UP TO HALF AN INCH IN DIAMETER IS ALSO POSSIBLE WITH THESE STORMS ALONG WITH WIND GUSTS TO 40 MPH AND FREQUENT LIGHTNING. PEOPLE ACROSS CENTRAL IDAHO AND WEST CENTRAL MONTANA ARE URGED TO TUNE IN TO LOCAL WEATHER INFORMATION SOURCES FOR THE LATEST INFORMATION AND STATEMENTS ON THIS DEVELOPING WEATHER SITUATION. THUNDERSTORMS ARE EXPECTED TO DIMINISH AFTER MIDNIGHT TONIGHT. HOWEVER...MORE STRONG THUNDERSTORM ACTIVITY IS ANTICIPATED SATURDAY.
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:56 PM PDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 49 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 2001Every severe thunderstorm warning in 2001
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.