Alert archive / Idaho / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 15, NWS Missoula, MT

July 12, 2001Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Jul 12, 2001, 10:49 PM PDT for Idaho County, Idaho. It was in force for 56 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Jul 12, 2001, 10:49 PM PDT (05:49 UTC)
Expired: Jul 12, 2001, 11:45 PM PDT
In force: 56 min
Issued by: NWS Missoula, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Idaho County, ID

The radar

The Pendleton radar (KPDT), 201 km from the middle of the area, began a volume at 05:50 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.

What was reported inside it

Time	Report	Where	Remark
Jul 12, 10:55 PM PDT	Hail 0.75	Riggins, ID

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 5.8 hours before the alert went out and 222 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 675 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 2569 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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.

000 
WUUS55 KMSO 130552
SVRMSO

IDC049-130645-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1049 PM PDT THU JUL 12 2001

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN IDAHO COUNTY IN CENTRAL IDAHO

* UNTIL 1145 PM PDT(1245 AM MDT)

* AT 1049 PM PDT(1149 PM MDT)...RADAR INDICATED A SEVERE THUNDERSTORM
  OVER RIGGINS...OR 38 MILES SOUTH OF GRANGEVILLE...MOVING NORTHEAST
  AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
    NEAR LUCILE AT 1105 PM PDT (1205 AM MDT).

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH
FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTIONv...GO INDOORS
AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A
WELL PROTECTED AREA.


LAT...LON 4542 11653 4533 11632 4576 11583 4589 11614

SULLIVAN

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 12, 8:14 PM PDT, 2 hours 35 minutes earlier.

Area forecast discussion, Jul 12, 8:14 PM PDT, 2 hours 35 minutes before

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
914 PM MDT THU JUL 12 2001

.SHORT TERM...SMALL CHANGES TO ZONES BUT OTHERWISE FORECAST ON-
TRACK. UNSTABLE SOUTHWEST FLOW ALOFT WITH SHORTWAVE OVER SOUTHWEST
MT AND ANOTHER ACROSS OR THIS EVENING. OVERALL DECREASE IN
THUNDERSTORM ACTIVITY CLOSER TO SUNSET BUT STILL HAVE ISOLATED
CELLS IN MANY AREAS. MORE CONVECTION MOVING UP FROM LEMHI COUNTY AND
NEAR THE OR/ID BORDER AT 03Z. NORTHWEST MT YET TO SEE MUCH
ALTHOUGH A FEW SHOWERS BETWEEN LIBBY AND NOXON. A 60KT SPEED MAX
OVER EASTERN OR MAY HELP SUPPORT NOCTURNAL CONVECTION ACROSS EASTERN
WA/ID PANHANDLE AND INTO NORTHWEST MT TOWARD SUNRISE. LATEST
ETA SHOWS THIS POTENTIAL. ANOTHER SHORTWAVE MOVES INTO CENTRAL ID BY
MIDDAY WITH ANOTHER ROUND OF STRONG THUNDERSTORMS POSSIBLE OVER THE
CWA. GOOD WIND SHEAR AND SIMILAR WET-BULB ZERO HEIGHTS AGAIN. HEAVY
RAIN AND PLENTY OF HAIL WERE MAIN CONVECTIVE THREAT TODAY. WILL
MONITOR SOUTHERN RAVALLI COUNTY FOR FLASH FLOOD THREAT UNTIL
THUNDERSTORMS END IN THIS AREA IN A COUPLE OF HOURS.  BOLDT

.MSO...FLASH FLOOD WATCH MTC081 THIS EVENING.

In the hours before

Local storm report, Jul 12, 7:01 PM PDT, 3 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
801 PM MDT THU JUL 12 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION......

0242 PM    GARRISON                  MT   0.88 INCH HAIL
07/12/01   POWELL

0250 PM    GARRISON                  MT   1.00 INCH HAIL
07/12/01   POWELL

0327 PM    GARRISON                  MT   2 INCHES OF RAIN IN ONE
07/12/01   POWELL                         HOUR.

0617 PM    DEER LODGE                MT   0.75 INCH HAIL
07/12/01   POWELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 5:06 PM PDT	Severe Thunderstorm Warning	MSO	Clearwater, Idaho	39 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2001 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.