Prescribed Fire in Grassland Butterfly Habitat: Targeting Weather and Fuel Conditions to Reduce Soil Temperatures and Burn Severity

Fire Ecology

Table 3 Average weather and fuel conditions for prescribed burns conducted in South Puget Sound, Washington, USA, prairies. All codes for the site listings are detailed in Table 1.

2014 burn date	Site	Time of ignition (hours)	Burn length (min)	Air temp. (°C)	RH (%)	Wind speed (m s⁻¹)	Fuel moisture		Fuel loading (kg m⁻²)	Thatch depth (cm)	Open ground cover (%)
2014 burn date	Site	Time of ignition (hours)	Burn length (min)	Air temp. (°C)	RH (%)	Wind speed (m s⁻¹)	Live (%)	Dead (%)	Fuel loading (kg m⁻²)	Thatch depth (cm)	Open ground cover (%)
22 Jul	LW	0942	33	15.9	71.2	0.5	74.7	14.5	0.52	2.4	0.6
22 Jul	LW	1341	11	18.9	64.5	1.2	81.3	8.0	0.59	2.8	0.4
5 Aug	TA6	0908	35	16.4	77.8	1.5	60.8	11.9	0.46	1.7	2.0
5 Aug	TA6	1430	9	28.9	46.6	1.7	61.2	3.4	0.55	1.9	0.2
7 Aug	JP	0804	27	14.4	87.9	1.9	58.8	13.3	0.56	2.2	0.7
7 Aug	JP	0920	20	15.2	84.3	2.1	66.4	12.3	0.63	3.3	0.8
7 Aug	JP	1400	20	26.5	46.3	1.7	53.6	2.7	0.56	1.7	1.6
7 Aug	JP	1501	9	28.1	41.6	2.0	63.4	2.3	0.54	2.4	0.5
15 Aug	UW	1238	28	23.8	67.0	1.2	59.4	30.0	0.49	2.3	1.5
18 Aug	TA15	0858	32	24.0	69.4	0.5	66.1	26.5	0.51	1.5	3.3
18 Aug	TA15	1002	20	25.9	59.7	0.9	59.8	21.4	0.53	1.6	2.3
18 Aug	TA15	1534	37	31.4	40.5	1.5	60.9	5.8	0.50	2.0	3.5
18 Aug	TA15	1716	20	32.0	44.6	0.9	60.4	5.8	0.53	1.8	1.4
19 Aug	UW	1632	15	26.4	50.7	3.7	64.4	4.3	0.44	2.1	1.7
25 Aug	SW	0900	28	21.1	70.4	0.6	58.4	16.3	0.65	2.7	1.6
25 Aug	SW	1505	13	29.0	35.5	2.2	60.3	3.1	0.55	1.8	5.0
15 Sep	GH	1014	20	20.2	53.3	1.5	71.1	8.2	0.18	2.7	15.0
15 Sep	GH	1230	12	28.1	32.3	2.3	61.9	4.4	0.25	2.5	13.4
18 Sep	TQ	1331	53	19.7	72.6	2.0	58.6	30.0	0.48	2.8	2.7
22 Sep	TQ	1600	17	22.8	53.3	0.9	51.1	13.1	0.52	3.5	2.5
	Minimum		9	14.4	32.3	0.5	51.1	2.3	0.18	1.5	0.2
	Mean		23	23.4	58.5	1.5	62.6	11.9	0.50	2.3	3.0
	Maximum		37	32.0	87.9	3.7	81.3	30.0	0.65	3.5	15.0