Alert archive / Montana / Tornado Warnings in 1999

Tornado Warning 4, NWS Glasgow, MT

July 12, 1999Daniels County, Montana

NWS Glasgow, MT issued this tornado warning at Jul 12, 1999, 6:24 PM MDT for Daniels County, Montana. It was in force for 36 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 12, 1999, 6:24 PM MDT (00:24 UTC)
Expired
Jul 12, 1999, 7:00 PM MDT
In force
36 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Daniels County, MT

The radar

The Glasgow radar (KGGW), 102 km from the middle of the area, began a volume at 00:24 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

TimeReportWhereRemark
Jul 12, 6:36 PM MDTHail 1.75Peerless, MT
Jul 12, 6:38 PM MDTHail 1Peerless, MT
Jul 12, 6:49 PM MDTHail 1Peerless, MT

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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.4 hours before the alert went out and 426 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-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 1999-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1355 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 1999-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1355 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
2177 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 6:07 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt63 min
Jul 12, 6:48 PM MDTSevere Thunderstorm WarningGGWRoosevelt62 min
Jul 12, 7:09 PM MDTSevere Thunderstorm WarningGGWRichland66 min
Jul 12, 7:47 PM MDTSevere Thunderstorm WarningGGWRoosevelt63 min
Jul 12, 8:05 PM MDTSevere Thunderstorm WarningGGWRichland65 min
Jul 13, 2:31 PM MDTSevere Thunderstorm WarningGGWDaniels79 min

Nearby

Tornado Warnings in Montana, 1999Every tornado warning in 1999Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.