Alert archive / Minnesota / Tornado Watches in 1999

Tornado Watch 591

July 27, 199914 counties in Minnesota; 9 counties in North Dakota; 11 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jul 27, 1999, 2:30 PM CDT for 14 counties in Minnesota; 9 counties in North Dakota; 11 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 27, 1999, 2:30 PM CDT (19:30 UTC)
Expired: Jul 27, 1999, 8:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 34 counties

Becker County, MN, Beltrami County, MN, Big Stone County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Polk County, MN, Red Lake County, MN, Stevens County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 84 km from the middle of the area, began a volume at 19:31 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.

Warnings issued inside it

31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jul 27, 2:34 PM CDT	Severe Thunderstorm Warning	FGF	Cass	36 min
Jul 27, 2:49 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	31 min
Jul 27, 3:00 PM CDT	Severe Thunderstorm Warning	FGF	Cass	35 min
Jul 27, 3:12 PM CDT	Severe Thunderstorm Warning	FGF	Cass	33 min
Jul 27, 3:14 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	61 min
Jul 27, 3:17 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	33 min
Jul 27, 3:19 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Ransom	36 min
Jul 27, 3:36 PM CDT	Severe Thunderstorm Warning	FGF	Cass	29 min
Jul 27, 3:48 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	32 min
Jul 27, 3:49 PM CDT	Tornado Warning	BIS	Dickey	41 min
Jul 27, 3:54 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	36 min
Jul 27, 4:01 PM CDT	Severe Thunderstorm Warning	FGF	Mahnomen	34 min
Jul 27, 4:03 PM CDT	Tornado Warning	ABR	Brown	32 min
Jul 27, 4:20 PM CDT	Severe Thunderstorm Warning	FGF	Richland	35 min
Jul 27, 4:27 PM CDT	Tornado Warning	FGF	Ransom, Richland	33 min
Jul 27, 4:28 PM CDT	Severe Thunderstorm Warning	FGF	Clearwater	32 min
Jul 27, 4:33 PM CDT	Severe Thunderstorm Warning	FGF	Clay	32 min
Jul 27, 4:34 PM CDT	Severe Thunderstorm Warning	ABR	Brown	46 min
Jul 27, 4:48 PM CDT	Severe Thunderstorm Warning	ABR	Marshall	47 min
Jul 27, 4:51 PM CDT	Severe Thunderstorm Warning	ABR	Spink	64 min
Jul 27, 4:52 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Hubbard	33 min
Jul 27, 4:55 PM CDT	Tornado Warning	FGF	Richland	35 min
Jul 27, 4:58 PM CDT	Severe Thunderstorm Warning	ABR	Faulk	47 min
Jul 27, 5:20 PM CDT	Tornado Warning	FGF	Wilkin	35 min
Jul 27, 5:21 PM CDT	Severe Thunderstorm Warning	FGF	Becker	34 min
Jul 27, 5:36 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami	34 min
Jul 27, 5:50 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	50 min
Jul 27, 5:55 PM CDT	Severe Thunderstorm Warning	ABR	Spink	45 min
Jul 27, 5:59 PM CDT	Severe Thunderstorm Warning	MPX	Stevens	31 min
Jul 27, 6:15 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone	50 min
Jul 27, 6:23 PM CDT	Severe Thunderstorm Warning	ABR	Clark	47 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 7.5 hours before the alert went out and 134 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: 3 J/kg
Mixed-layer CIN: -442 J/kg
Mixed-layer LCL: 1364 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 5:00 PM CDT	Tornado Watch	SPC	Aitkin, Anoka, Benton, Big Stone, Carlton, Carver and 29 more	6 hr
Jul 27, 6:30 PM CDT	Tornado Watch	SPC	Brown, Carver, Cottonwood, Jackson, Lincoln, Lyon and 12 more	6 hr
Jul 27, 4:00 PM CDT	Tornado Watch	SPC	Beadle, Bennett, Brule, Buffalo, Hand, Hughes and 10 more	5 hr

Nearby

Tornado Watches in Minnesota, 1999 Tornado Watches in South Dakota, 1999 Tornado Watches in North Dakota, 1999 Every tornado watch 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.