Alert archive / Montana / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 2, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jun 23, 2011, 12:29 PM MDT for Flathead County, Montana. It was in force for 34 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 23, 2011, 12:29 PM MDT (18:29 UTC)
- Expired
- Jun 23, 2011, 1:03 PM MDT
- In force
- 34 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
County Flathead County, MT
The radar
The Missoula radar (KMSX), 159 km from the middle of the area, began a volume at 18:32 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 |
|---|---|---|---|
| Jun 23, 12:39 PM MDT | HAIL 0.5 | 2 N Creston, MT | DIME SIZED HAIL REPORTED BY SPOTTER. |
| Jun 23, 1:00 PM MDT | HAIL 1.25 | 2 Nne Creston, MT | SPOTTER REPORTED SOME SHINGLE DAMAGE AND DENTS IN COPPER ROOFING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 6.5 hours before the alert went out and 223 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1871 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 19 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.
869
WUUS55 KMSO 231829
SVRMSO
MTC029-231915-
/O.NEW.KMSO.SV.W.0002.110623T1829Z-110623T1915Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1229 PM MDT THU JUN 23 2011
THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL FLATHEAD COUNTY IN NORTHWEST MONTANA...
* UNTIL 115 PM MDT.
* AT 1222 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. THIS STORM
WAS LOCATED NEAR KALISPELL...AND WAS MOVING NORTHEAST AT 50 MPH.
* LOCATIONS IMPACTED INCLUDE...CRESTON...EVERGREEN...KALISPELL...
NYACK AND PINNACLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. DAMAGING WINDS
ARE POSSIBLE...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 4856 11350 4856 11347 4855 11345 4846 11347
4843 11341 4842 11334 4806 11419 4821 11435
4859 11360 4859 11355
TIME...MOT...LOC 1829Z 234DEG 43KT 4818 11416
$$
DICKERSON1 follow-up statement
444
WWUS55 KMSO 231903
SVSMSO
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
103 PM MDT THU JUN 23 2011
MTC029-231911-
/O.CAN.KMSO.SV.W.0002.000000T0000Z-110623T1915Z/
FLATHEAD MT-
103 PM MDT THU JUN 23 2011
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FLATHEAD COUNTY IS
CANCELLED...
THE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER CONSIDERED SEVERE. HEAVY RAIN WITH PEA SIZED HAIL ARE STILL
POSSIBLE AS THIS STORM TRACKS NORTHEAST AT AROUND 40 MPH INTO
GLACIER NATIONAL PARK OVER THE NEXT 45 MINUTES.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT
THURSDAY EVENING FOR NORTHWESTERN MONTANA.
LAT...LON 4856 11350 4856 11347 4855 11345 4846 11347
4843 11341 4842 11334 4806 11419 4821 11435
4859 11360 4859 11355
TIME...MOT...LOC 1901Z 234DEG 43KT 4840 11369
$$
DICKERSONThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 1:51 AM MDT | Special Weather Statement | MSO | Flathead | 39 min |
| Jun 23, 11:17 AM MDT | Areal Flood Warning | MSO | Deer Lodge | 14 days |
| Jun 23, 11:49 AM MDT | Areal Flood Warning | MSO | Missoula | 68 hr |
| Jun 23, 12:19 PM MDT | Special Weather Statement | MSO | Flathead | 41 min |
| Jun 23, 1:34 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 26 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.