Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 36, NWS Grand Forks, ND

June 4, 1999Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 4, 1999, 7:04 PM CDT for Polk County, Minnesota. It was in force for 36 min. 1 report 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: Jun 4, 1999, 7:04 PM CDT (00:04 UTC)
Expired: Jun 4, 1999, 7:40 PM CDT
In force: 36 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Polk County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 74 km from the middle of the area, began a volume at 00:05 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 4, 7:15 PM CDT	Hail 0.75	Gully, MN

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 4, 3:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 0.1 hours before the alert went out and 246 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: 1521 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1248 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.3

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.

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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 4, 1:45 PM CDT, 5 hours 19 minutes earlier.

Area forecast discussion, Jun 4, 1:45 PM CDT, 5 hours 19 minutes before

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The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 5, 2:20 AM CDT	Severe Thunderstorm Warning	FGF	Richland, Sargent	50 min
Jun 4, 10:51 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	34 min
Jun 4, 11:30 PM CDT	Severe Thunderstorm Warning	FGF	Clearwater, Mahnomen	35 min
Jun 4, 11:55 PM CDT	Severe Thunderstorm Warning	FGF	Becker	35 min
Jun 5, 12:06 AM CDT	Severe Thunderstorm Warning	FGF	Clearwater	34 min
Jun 5, 12:20 AM CDT	Severe Thunderstorm Warning	FGF	Hubbard	35 min
Jun 5, 12:55 AM CDT	Severe Thunderstorm Warning	FGF	Hubbard	50 min
Jun 5, 2:37 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Wilkin	48 min
Jun 5, 2:56 AM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	49 min
Jun 5, 3:11 AM CDT	Severe Thunderstorm Warning	FGF	Clay	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1999 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.