Alert archive / Montana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 72, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 14, 1999, 6:17 PM MDT for Fergus County, Montana. It was in force for 43 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 14, 1999, 6:17 PM MDT (00:17 UTC)
- Expired
- Aug 14, 1999, 7:00 PM MDT
- In force
- 43 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Fergus County, MT
The radar
The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 00:19 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 14, 4:15 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 0.3 hours before the alert went out and 106 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
- 13 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1802 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 14, 2:45 PM MDT, 3 hours 32 minutes earlier.
Area forecast discussion, Aug 14, 2:45 PM MDT, 3 hours 32 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 245 PM MDT SAT AUG 14 1999 12Z MDL DATA SLOW TO ARRIVE. NGM AND AVN FAIRLY SIMILAR WITH MOST DETAILS OF UPR TROF MOVG E. SAT IMAGERY INDICATES UPR LOW OVR XTRM ERN WA ATTM WITH A FAIRLY WELL DEFINED MSTR PLUME THRU N-CNTRL ID AND WRN MT. SOME CNVTV ACTVTY ALRDY KICKING OFF OVR SW MT BUT TSTMS HAVE BEEN WEAK. WL LEAVE HIGHEST POPS TGNT FOR SW AND NW PORTION OF CWA AND THEN GO WITH HIGH POPS ACRS N-CNTRL MT SUN. AVN HAS WLY FLOW OVR CWA BY SUN NGT WITH ANOTHER S/WV DROPPING INTO NW MT MON. COOLER AIR FOR SUN WITH A SLGT WRMG MON. EMANUEL GTF 5512 HLN 6423 HVR 5632
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 6:22 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 53 min |
| Aug 14, 6:37 PM MDT | Tornado Warning | TFX | Fergus | 33 min |
| Aug 14, 6:55 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 50 min |
| Aug 14, 7:12 PM MDT | Tornado Warning | TFX | Judith Basin | 33 min |
| Aug 14, 7:17 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 28 min |
| Aug 14, 7:35 PM MDT | Tornado Warning | TFX | Fergus, Judith Basin | 25 min |
| Aug 14, 7:54 PM MDT | Tornado Warning | TFX | Fergus | 66 min |
| Aug 14, 10:22 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 38 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1999Every severe thunderstorm warning in 1999
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; radar from the NEXRAD Level II archive.